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Патент USA US2137996

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Nov. 22, 1938.
Original Filed July 5, 1929
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54 014/678
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Original Filed July 5, 1929
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2,137,996 '
Original Filed July 5, 1929
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Origi?al Filed July 5, 1929
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R_ 57 P_ (:RAWFORD
Original Filed July 5, 1929
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Nov. 22, 1938.
Original Filed July 5, 1929
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450 ‘L
w 246
P228 ’
foaf/er 5 P CBAH/FORD,
Patented Nov. 22, 1938'
Robert B. P.v Crawford. Washington, D. 0., as
signor to Frick Comp any, Waynesbo'ro, Pm, a
corporation of Pennsylvania
Application July 5, 1929, Serial No. 375,952
Renewed June 10, 1938
45 Claims.
This invention relates to air conditioning sys
tems and more particularly to the method of and
apparatus for maintaining the required humidity
and temperature conditions in such systems along
5 with special treatments applied particularly to
recirculated-air as will be disclosed hereinafter
in detail.
The present invention is shown as used in con
nection with incubating and brooding apparatus
10 such as is used on poultry farms for hatching eggs
_ and brooding chicks, and has as its general ob
ject to provide improved methods and apparatus
for governing the conditions under which the in
cubating and brooding operations occur, to the
15 end of increasing the yield of healthy chicks from
a given quantity of fertile eggs. The steps of in
cubating and hatching are so closely related, the
one immediately following the other in the period
of incubation of the egg, that, insofar as certain
20 broad features of the invention are concerned,
they may be regarded as the same, and the same
is also true of the steps of hatching and brood
ing, while with reference to other more speci?c
features of the invention the operations of in
25 cubating, hatching and brooding are three en
tirely distinctive steps calling for di?’erent ap
paratus and a di?erent treatment of conditions
in association with each, as will be pointed out at
greater length in the detail description of my in
Owing to the large scale operations under
which incubating and brooding is now carried on,
wherein thousands of eggs are frequently handled
in a single hatch, it is now being realized that for
35 the greatest hatching yield consideration must
be given to factors which were hitherto not ap
preciated or were totally ignored. In order that
the highest e?iciency may be obtained in the in
cubating, hatching and brooding enclosures, I
40 have found that consideration must be given to
the following conditioning factors: (1) The main
tenance of the proper temperature; (2) the
maintenance of the proper humidity; (3) the
supplying of the requisite oxyge ' (4) the dissi
pation or removal of carbon di xid and other
gases emitted from the eggs; (5) the supplying
of a bactericidal agent, such being highly desir
able, although not essential; and (6) the removal
of ,?uif picked up by the air currents from the
60 bodies of the chicks, such also being highly de
sirable, although not essential.
Eggs in their early stages of incubation require
the supplying of an appreciable amount of heat
thereto, and, hence, the air contacting with these
55 eggs must be at a sui?ciently high temperature
(Ci. 25741)
to supply this heat. On the other hand, eggs in
the advanced stage of incubation generate and
emit heat, and care must be taken that the air
contacting with these eggs does not allow them
to become overheated. It will therefore be seen
that the maintenance of the proper temperature
is critical, where maximum incubating e?iciency
is desired, and the circulation of this air is also
important for the avoidance of “hot spots” in the
incubating enclosure.
Still further, the temperature of the air sup
plied to the hatched chicks should preferably be
considerably lower than the temperature of the
air circulated through the eggs.
With reference to humidity, it is desirable that
such be maintained at an approximately constant
percentage, or within certain limits. Moreover,
the relative humidity of the air in the incubat
ing egg enclosure should preferably be of a dif
ferent value than the relative humidity of the air
in the chick enclosure.
Eggs in the advanced stage of incubation‘give
o? considerable carbon dioxid, and these eggs
must be supplied with additional oxygen. The
carbon dioxid emitted from these eggs in the
advanced stage of incubation, and from the
chicks, must be effectively removed from the air
for maximum incubating and brooding e?iciency.
The use of a bactericidal agent is a preferred step
in my improved method for preventing the growth 3 ‘fl
of bacteria. According to one method'the inven
tion contemplates the use of ozone or formalde
hyde as the bactericidal agent, and preferably
supplies such agent to the different enclosures in
different proportions, represented by an inhibit- 35
ing or weak concentration in one case, and by a
killing or strong concentration in another case.
According to an alternative or supplementary
method, the circulating air is brought into con
tact with a purifying circulation of liquid in the ‘
conditioning apparatus.
Based upon the foregoing, the invention has as
one‘ of its principal objects to provide an improved
method of and apparatus for conditioning the in
cubating, hatching and brooding enclosures
whereby all of the above conditioning factors are
properly taken care of and are properly'r'egu
lated in accordance with the particular require-
ments of the enclosure.
A further object of the invention is to provide
incubating and hatching apparatus which can bet cu O
substantially closed to atmosphere and wherein
substantially the same charge of air is recircu
lated continuously through the apparatus. In
this continuously repeated cycle of circulation 55
_ .' l aromas
such volume of air is repeatedly reconditioned as
been applied, with the upper portion partly
to humidity, temperature, the removal of. carbon
dloxid, the removal of fluff, the replenishment
‘broken away;
Fig. 2 is a side view thereof, partly in longitu
of oxygen, and the supplying of a bactericidal
agent. By virtue of the fact that the air circuit
can be substantially closed to atmosphere, the
above conditioning factorscan more easily be
maintained at ?xed de?nite values, such being
gi‘nal section on the plane of the line 2-4 of
of particular importance 'as regards tempera
to the incubating eggs; .
10 ture and humidity, which are thus substantially
isolated from the in?uence of temperature and
humidity variations of outside atmosphere. Such
' substantial isolation of the volume of conditionq
ing air from outside in?uences enables the tem
15 perature and humidity of the conditioning air
to be maintained at the desired values with a
minimum expenditure of energy. In its con
tinuously repeated circulation in the system, this
volume of conditioning air functions as a vehicle
20 or conveying medium for conveying the proper
temperature to or from the eggs, and chicks; for
conveying the proper humidity to the eggs and
chicks; for conveying the carbon dioxide from
the eggs and chicks to a point of dissipation
25 from the system; for conveying oxygen and a
bactericidal agent to the eggs and chicks; and
for conveying flu? from the chicks to a point
of ?uff removal.
As above remarked, numerous advantages ac
30 crue to the ability to substantially seal or close
the air circuit from the atmosphere, avoiding
8- 1;
Fig. 3 is a view similar to Fig. 1, of an enclo
sure ‘wherein the air supplied to the hatching
eggs is handled separately from the air supplied
Fig. 4 is a transverse sectional view through 10
this latter embodiment, taken approximately on
the plane of the line 4-4 of Fig. 3;
Fig. 5 is a vertical sectional view through a
relatively simple form of conditioning appara
tus arranged for handling a single volume or 15
quantity of air;
Fig. 5A is a detail ?gure showing a modified
construction of the conditioning apparatus illus
trated in Fig. 5;
Fig. 6 is a similar sectional view through an
other embodiment of conditioning apparatus for
handling a single volume or quantity of air, the
electrical control circuits thereof being illus
trated diagrammatically;
Fig. 6A is a fragmentary diagram of the cir
cuits of the control relays illustrated in Fig. 6;
Fig. 'l is another vertical sectional view through
a modified embodiment of conditioning appara
tus handling two separate volumes or quantities
of air, and illustrating the humidity controlling 30
or transferring communication between the two
those temperature and humidity losses and ?uc-, portions of the system;
tuations which are always incident to the use
of fresh air inlets and foul air vents, and in
35 most embodiments of the present invention the
air circuit is thus closed from the atmosphere.
However, the invention is not limited to this spe
ci?c arrangement,v and in fact I have shown some
embodiments where the air circuit or the enclo
sure has communication with the atmosphere,
such being particularly adaptable, for example,
to brooders wherein the conditioning require
ments as to temperature and humidity are not
-.-so exacting as in incubating and hatching en
A further object of the invention is to provide
an improved method of reducing the tempera
ture of the spray water for the conditioning ap
paratus, comprising the novel step of utilizing
an outside cooling tower and thus avoiding the
50 expense and care of operation of refrigerating
apparatus or the supplying of cooler city water.
In this regard, another object of the invention
is to provide an improved method of dissipating
carbon dioxid and other objectionable gases to
the atmosphere while still retaining the circuit
of the conditioning air substantially closed to
A further object is to provide an improved
conditioning system wherein the installation cost
Fig. 8 is a vertical sectional view through an
other modi?ed embodiment of conditioning ap
paratus, the control apparatus therefor being 35
illustrated diagrammatically;
Fig. 8A is a vertical sectional detail view of
refrigerating apparatus for cooling the spray
water and also a control valve for introducing
cold water to the circulating system;
Fig. 8B is a fragmentary diagram of a modi
?ed arrangement of the pressure controlled
blower means illustrated in Fig. 8;
Figs. 9, 10, 11, 12, 13 and 14 are diagrammatic
views illustrating adaptations of my invention 45
to a plurality of enclosure units;
Fig. 15 is a diagrammatic view of an embodi
ment wherein water is circulated through the.
Figs. 16 and 17 are similar views showing modi
?ed arrangements thereof; and
Fig. 18 is an illustration, partly in section, of
an embodiment employing two conditioning de
vices, and adaptable to ,the conditioning of dif
ferent types of enclosures calling for different 55
conditioning requirements.
Referring ?rst to Figs. 1 and 2, an incubating
enclosure is generally indicated at I. The eggs
undergoing incubation are supported in stacks
unique method of heat interchange and humidity
interchange between the di?erent enclosures of
the system. A further object is to provide a con
of superposed trays 2| which may be grouped
in any preferred relation in the incubator.
In the arrangement shown, the trays are
grouped in a tier or‘ tiers extending centrally of
the enclosure, whereby an aisle 22 is provided
and the operating expenses are kept low by a
ditioning system ofthe above general descrip
at each side of the stacker tier, from which
tion wherein practically all of the controlling
and regulating operations are performed auto
trays from opposite sides of the stack. Entrance
doors 23 are provided for the aisles 22 at one
end of the enclosure. The egg supporting trays
Other objects and advantages of the inven
tion will appear in the following description,
70 disclosing one preferred manner of carrying my
invention into e?'ect'.
In the drawings accom
panying this description:
Fig. 1 is a plan view of an incubating and
enclosure to which my invention has
aisles access may conveniently be had to the
are usually mounted on tiltable supporting means 70.
whereby the trays may be tilted periodically to
turn the eggs, the details of such tilting mecha
nism in and of themselves forming no part of
the present invention. A false ceiling 25 spaced
from the roof of the enclosure de?nes an upper 75
plenum chamber 25 into which the ascending air . 58, also disposed in this lower pump compart
enters through openings 21 in the false ceiling ment ‘of the casing. A return pipe 59 leads
25. ' A ?oor 23 spaced from the bottom of the downwardly from the bottom of the tank 54 and
enclosure de?nes a lower plenum chamber 3| communicates with the inlet to the pump P, the
into which the conditioned air is circulated for upper end of such return pipe being preferably
passing up through openings 32 in the ?oor 23 ‘closed over by a straining screen ‘5| to prevent
and circulating upwardly between the eggs. It foreign matter being circulated by the pump. .
will be understood that the bottom of the trays , Such water as is .taken up by the air in the
2| are of openwork or mesh construction so that humidi?cation of the latter is replenished from,
10 the ascending current of air will have intimate
contact with all of the eggs.
During incubation the eggs are periodically
moved as stated above and when the eggs are
I ‘being tilted it is convenient and desirable to pro:
15 gressively move the trays ‘from one position to
an outside source of supply connecting with the
pump or with the tank 54 through a suitable ?oat 10
‘controlled valve in any well known manner.- The I
possibility of-an excessively high level in the tank
54 is prevented by an over?ow pipe 65 leading
to an outside point of discharge.
another in the tiers, from one tier to another,
Disposed above the water chamber 54 is a
as when the eggs reach the hatching period, or basket or tray 58 adapted to contain lime ‘or
otherwise. When the eggs reach the hatching other alkali for absorbing carbon dioxid from
stage, the trays containing the same may be the air. Such lime container is also removably
20 shifted to another portion of the tier or to any supported on angle brackets 69, and the front
other part of the enclosure, or such trays may wallof the casing is provided with a normally 20
be allowed to remain in the positions to which ‘closed opening through which such container
they have been progressively moved during the can be withdrawn for replenishing the lime
incubating period.
In the disclosure illustrated in Figs. 1 and 2
The spray water in precipitating down over th
the same volume or quantity of airv which is
circulated in contact with the eggs in process
of incubation is also circulated in contact with
the eggs which have reached the hatching stage.
The air ascending into the upper plenum cham
ber 26 is circulated longitudinally thereof into
a‘ duct 34 leading to the upper end of a condi
tioning unit Cl disposed at the end of the incu
bating enclosure I.
Referring to Fig. 5, such conditioning unit
comprises a casing 4| having its interior divided
into three vertical passageways 42, 43 and 44 by
the two vertical partitions 45 and 45. A trans
verse partition “ closes the upper ends of the
40 two passageways 43 and 44. The air entering
through the duct 34 passes downwardly through
the chamber area or passageway 42, ?rst en
countering a find removing screen 48 extending
across the upper end of the passageway. 42. The
mesh of this screen is sufficiently fine to catch
all of the light feathery ?u?' picked up by the air
rising through the hatching trays. The screen
has tray ?anges around its perimeter which slide
upon angle iron supporting brackets 49, the front
50 or side wall of the casing having a normally
closed opening through which the screen can be
Withdrawn for cleaning.
The air then passes through a spray zone cre
ated by spray apparatus S comprising nozzles
55 52 projecting outwardly from a vertical spray
pipe 53. The upper nozzles discharge upwardly
against the screen 48 and the lower nozzles dis
charge downwardly, although such arrangement
is not essential.
The air then passes around the lower end of
the partition 45 and upwardly into the inter
mediate passageway 43, where it enters another
spray zone created by the discharge from nozzles
52' projecting from a branch spray pipe 53’.
65 Some of the latter nozzles are preferably direct
ed upwardly so that part of the spray is upwardly
and part downwardly.
The precipitated spray
water accumulates in a reservoir or tank 54
formed at the lower ends of the passageways 42
70 and 43 by a transverse plate 55 extending be
tween the side wall of the casing and the parti
tion 46.
The main spray pipe 53 extends down
through the water tank 54 and connects with‘
the outlet of a pump P disposed below the water
tank. The pump is driven by an electric motor
lime in the container 58 carries some of this lime
in solution up to the spray jets 52. 52’ where it
is projected into the air. The removal of sub
stantially all carbon dioxid' from the air occurs
along with the humidi?cation of the air in the 30
two spray zones 42 and‘ 43, by virtue of vthe higher
partial pressure of the carbon dioxid resulting
in absorption thereof by the spray water, and
also by virtue of the direct vcontact of the air
with the lime in the container 68, as will be 35
hereinafter described in more detail.
Extending across the upper portion ‘of the
intermediate passageway 43 is a series of baiiles ‘H
which prevent the spray from passing upwardly
out of the upper‘end of said passageway, and
which also function‘ to scrub the air and remove
excess, unvaporized water therefrom. Projecting
into such baffles is a thermostat H, of any desired
type, which governs the humidity of the air, as
will be presently described. After passing up
through the baffles ‘II the air‘ is de?ected laterally
and passes through an electric heater 13, from
whence it enters the upper end of the third pas
sageway 44. This heater is controlled by a ther
mostat preferably located in the incubating en 50
closure, such being hereinafter described in the
description of the control circuits. The air cir
culating down through the passageway 44 enters
a blower F which impels it through a suitable
duct into the lower plenum chamber 3! below the
floor in the incubating enclosure.
The rotor of the fan or blower F is coupled to
the electric motor 58 through the partition Wall
56 whereby the same motor drives the spray pump
and the blower.
The humidity regulating device or apparatus H
senses the dew point or humidity of the air and
may be arranged to effect its control on such dew
point or humidity either by governing the tem
perature of the spray water, by governing the 65
volume or character of the spray projected, by '
governing the admixing of chemicals with the
spray liquid, and in various other ways to be here
inafter described. In the arrangement shown in
Fig. 5, the humidity control is exercised over the 70
temperature of the spray water and the-volume
or character of the spray projected. Such humid
ity regulating apparatus H comprises suitable
control means as a part ,thereohwhich control
means may be mechanical, pneumatic or electrical g5
in its operation. In the preferred electrical em
control obtainable with electrical heating means,
bodiment the rise and fall of dew point or humid~
ity moves a switch 12 into engagement with either
a continuous source of steam supply.
of two contacts 15 and 16. When the dew point
falls below a predetermined value the switch
establishes a circuit through contact 15 and wire
15' to an electric heater 11 disposed in the spray
water tank 54. The consequent rise in tempera
ture of the spray water functions to bring the dew
10 point back up to its desired value. On. the other
hand, if the dew point or humidity should rise
above a predetermined value the switch 12 estab
lishes a circuit through contact ‘I6 and wire 16'
to an electromagnetically operated valve ‘I8 which
15 controls the discharge of spray from relatively
coarse or large nozzles ‘i9.
These nozzles have branch connection through
a tee 8| or other suitable connection with the
spray piping 53, 53', and when the valve ‘18 is
opened the major portion of the water is dis
and, furthermore, steam heating means requires
The same
is true of hot water heating means.
Comprising part of the conditioning apparatus
is an ozone generating machine indicated gen
erally at G in Fig. 5. These devices are well
known and need not be described in detail.
ozone is introduced into the conditioning unit
through a conduit 86 leading from the ozone 10
machine G and opening into the conditioning
unit preferably in the passageway 44 above the
blower F. Ozonized air is conducted from the
conduit 86 into the conditioning unit at a rate
proportioned to have the proper bactericidal and
oxygen supplying characteristics suitable for in
cubating and hatching requirements. In lieu of
ozone I may employ formaldehyde or some other
bactericidal agent, which is preferably inserted
into the system in the conditioning unit, so that 20
the air stream will serve as a conveying and
Such discharge is a. relatively coarse spray which _ diffusing vehicle therefor.
charged through these relatively large nozzles.
is not vaporized or picked up by the air stream
to the extent that the ?ner spray from the nozzles
52, 52' is. Hence, with a rise in humidity, the
automatic opening of the valve ‘I8 through the
circuit connections above described, results in the
projectionof a coarse spray in lieu of the ?ne
spray, thereby promptly lowering the humidity
By compelling such agent to pass through the
fan F the same is effectively diffused in the air.
The bactericidal agent may be introduced into 25
the air stream through a membrane or porous
The operation of the above described embodi
ment is substantially as follows:-—The motor ‘58 is
to its desired value. It will be understood that the ' operated continuously so that the fan or blower F
maintains a continuous circulation of air through
automatic valve ‘I8 might be arranged to inter
rupt the projection of all spray or a considerable the enclosure I and through the conditioning unit.
part thereof in the spray chambers for lowering The continuously operating pump P also main
the humidity, but in such ‘case the valve would tains a continuous spray discharge in the succes~
sive spray chambers 42 and 43. The conditioned 35
be normally open and would close when ener
gized by placing the valve ‘I8 in pipe 53 above air passing from the lower'plenum chamber 3|
the pump and below the branch connections, as up through the eggs heats the eggs in the early.
stages of incubation and maintains the eggs which
indicated in Figure 5A.
are in the later stages of incubation at the proper
The dry bulb temperature of the air is con
uniform temperature. A high air velocity is
40 trolled by temperature control means T compris
ing a thermostat and a suitable switch or other maintained to avoid stagnant areas and the holes
32 in the plenum chamber walls may be of gradu
control device for regulating the electric air heat
er 13. The thermostat T is preferably located in . ating diameters (Fig. 1) to obtain the most effec
the incubating enclosure I, although it may be tive distribution of air. This air picks up carbon
dioxid emitted from the eggs, and also picks up
situated in the duct leading from the upper por
tion of the enclosure to the conditioning unit, or ?uff from the chicks, and conveys the same
in the duct leading from the conditioning unit to through the upper plenum chamber 26 and
through the duct 34 into the conditioning unit C I .
the lower portion of the enclosure but for con
venience is diagrammatically illustrated outside The ?uff is ?rst removed from the air at the
the conditioner in Fig. 5, although it is shown in screen 48. Entering the spray zone in the region
of the nozzles 52, the air becomes partially satu
Fig. 2 in the incubator. Such thermostat func
rated, and also gives up a considerable part of
tions with a lowering of the dry bulb tempera
ture below its desired value to switch on or to its carbon dioxid to the spray water by reason
increase the heating e?lciency of the element 13, of the difference of partial pressures of carbon
and to switch off or to decrease the heating action dioxid between the air and water. Additional
carbon dioxid is also absorbed by the lime in the
of such element with a rise of the dry bulb tem
container 58 as the air passes in contact with the
perature, thereby maintaining the latter sub
stantially constant.
The two thermostats H and T are adjusted to
maintain a substantially ?xed differential of pre
determined value between the dew point and the
dry bulb temperature of the air, thereby main
taining a substantially ?xed relative humidity in
the incubating enclosure. The permissible change
65 of dry bulb temperature is con?ned between
closely spaced limits, and. accordingly. if it is
desired to adjust the relative humidity such is
preferably accomplished by adjusting the re
sponse of the dew point thermostat H, or its con
70 trol mechanism, whereby the relative humidity
can be raised or lowered. In lieu of the electrical
heating means 13 and 11, steam heating means
may be employed under this same control of the
two thermostats H and T, but such heating medi
76 um does not lend itself as readily to the critical
Passing upwardly through the other spray pas
sageway 43, the saturation of the air is completed 60
or augmented, and a further removal of all re
maining carbon dioxid also occurs in this passage
way, the same passing into solution in the water
by reason of the difference of partial pressures
and the lime content of the water.
It‘v will be understood that the‘ degree of water
saturation of the air occurring in the two pas
sageways 42 and 43 will be dependent upon the
temperature of the spray water relatively to the
temperature of the air and the super?cial area
of the water drops. The air passing upwardly
through the ba?ies ‘H will have removed there
from all free water not constituting a part of the
true vapor content of the air, and in passing
through these ba?les the dew point temperature 75
will be sensed by the thermostat H. If the dew
point is high for the predetermined dry .bulb
temperature or relative humidity, the automatic
valve ‘I8 will be opened for reducing the super?cial
area of the water drops, i. e., projecting a coarse
spray, and, conversely, if the dew point is low the
temperature of the spray water will be auto
matically raised by the energization of the electric
water heater 11. The air in then passing through
10 the heating element 13 will be heated or not, de
pending upon the temperature in the enclosure I,
as sensed by the dry bulb thermostat T. At a
point preferably between the heater ‘I3 and the
intake of the blower F, the ozone, formaldehyde
above the water level in the tank and having its
upper end surrounded by an annular ?ange 96
within the hollow hub 93, such ?ange preventing
the entrance of water into the upper end of the
well sleeve 95. Extending ‘downwardly and in
wardly from the hub portion 93 is a conically
formed skirt portion 91 having its lower end
spaced from the stationary sleeve 95 to form an
annular feeding passageway through which water
is conveyed upwardly into the hollow interior of 10
the hub. Small discharge ori?ces 98 are formed
in the periphery of the hub, between the impelling
arms 92,‘ from which ori?ces the water is dis
charged in spray form. The arms 92 \may be in
15 or the like is introduced into the air stream . clined slightly, like fan blades, for projecting the
from the source of supply G. It will hence be
spray upwardly and outwardly to substantially
seen that the air returned by the blower F into
the lower plenum chamber 3| has all fluff and
carbon dioxid removed therefrom, contains a
proportion of ozone for bactericidal and oxygen
supplying purposes, is maintained at the desired
relative humidity for most eifective incubating
and hatching, and is likewise maintained at the
most effective dry bulb temperature for supplying
heat to the eggs in the early stages of incubation
and for maintaining uniform the desired tem
perature of all of the eggs in the advanced stages
of incubation.
It is also noteworthy that the present system
30 is substantially entirely enclosed or self-contained
in that it always recirculates practically the same
volume or charge of air, completely recondition
ing the same in each cycle of its circulatiomand,
hence, avoiding the necessity of outlets for foul
air, intakes for fresh air, etc., with the attendant
objections of loss of heat, di?lculty of maintaining
the proper temperature, and di?iculty of main
taining the proper humidity.
Fig. 6 illustrates a modi?ed construction of con
40 ditioning unit CI adapted for use with enclosures
of the type illustrated in Figs. 1 and 2, wherein a
single volume or quantity of air is continuously
recirculated through a conditioning cycle. Such
embodiment also comprises a main casing lI'
having the upper portion of its interior divided
into three passageways 42', 43' and 44' by the
vertical partitions 45’ and 46'. The air enters
the upper end of the passageway 42' through
the duct 34' leading from the upper plenum
chamber of the incubating enclosure. In brief,
the circulation of the air through the condition—
ing unit is somewhat similar to that described
of the preceding embodiment, the air passing
downwardly through the passageway 42' and
upwardly through the passageway 43', in which
rounding the lower portion of the hollow hub.
The quantity of water vapor projected into the
chambers 42', 43' is governed by regulating ‘the
rate of water feed from the main water tank 54'
to the feeding well IN, and if no spray is de 25
sired all supply to the well IN is cut off.
This is effected by a regulating valve I02, which
is interposed in a pipe I03 serving to conduct
water from the main compartment 54' to the
feeding well I0.I.' This valve is automatically 30
controlled in accordance with humidity require
ments, as will be hereinafter described. A sub
stantially constant level of water is maintained
in the tank 54' by a float regulated inlet general
ly indicated at I04, and the possibility of the 35
level rising above this'predetermined height is
prevented by an over?ow outlet 65'.
The spray is prevented from being projected
out of the two chamber areas 42' and 43' by baf
?es 1|’ extending across the upper portions of
both. The air entering through the duct 34' 40
passes down through the ba?les ‘II’ of the ?rst
passageway 42' and then encounters a series of
?uff removing screens 48'. In this modi?ed em
bodiment, such screens are arranged in vertical
ly stepped relation with succeeding screens spaced 45
fro each other, and extending across the entire
width of the passageway 42’. The side edges of
each screen are removably mounted on trans
versely extending supporting bars 49', or upon
any other suitable frame structure, and these 50
screens can be cleaned in place or removed for
cleaning through a normally closed opening 50'
in the front or side wall of the casing H’. The
passageways it is subjected to a ‘water spray, and
spray projected against the under sides of said 55
thence passing down through the third passage
way 44' to a fan or blower F which impels the
adhere thereto. It will be understood that such
screening arrangement may be employed in the
air through a lower passageway 88 to the duct
?ll both spray chambers 42' and 43’ with a ?ne
ly atomized spray. The water is sucked up :into
the hollow hub 93 from a feeding well IOI, de
fined by an annular wall in the tank 54' sur 20
89 leading to the lower plenum chamber 3|. In
this modi?ed embodiment the spray zone is cre
ated by a mechanically operating centrifugal
water thrower S which draws water from the
water chamber 54’ and projects the same up
wardly in a ?nely atomized condition in the two
passageways 42' and 43' on opposite sides of the
partition 45’. Said rotary spray device comprises
a plurality of impelling arms 92 radiating from
a hollow hub 93 which is secured to the upper
end of a vertical motor shaft 94, the latter ex
screens retains the same wet so that ?u?.’ will
embodiment shown in Fig. 5, or, the screen ar
rangement illustrated in such latter ?gure may 60
be employed in the construction shown in Fig. 6.
If it should be desired to subject the air to
the presence of lime for extracting carbon di
oxid, a lime tray or basket 98' may be mounted
in the passageway 42', below the screens 48', and
in position to be removable through the open- »
tending upwardly through the bottom wall 55'
ing 50'.
The air in passing up through the secondary
spray chamber 43' will have all free water re
moved therefrom in passing through the ba?les 70
'II' at the upper end of such chamber. The air
of the water tank from a vertical motor 58' dis-_
then passes down through the outer passageway
posed below the tank. A sleeve 95 extends up
wardly from the bottom wall 55' to form a well
the tank 5,!’ to a centrifugal fan F mounted on
for the shaft 94, such sleeve extending upwardly
44' and through a lower passageway I06, below
the motor shaft 94 below the motor 50'. A hori 75
zontal wall I08, de?ning the bottom of the pas
sageway I06, has an opening therein through
which the air passes to the center of the fan F.
Said fan is enclosed in a housing portion I09 de
pending from the transverse wall I08, and the
air is impelled from this fan through the housing
upper ends of both spray chambers. The contin
uous wetting of these baiile surfaces aids mate
rially in the‘ absorption of carbon dioxid and other
objectionable gases from the conditioning air, the
impingement of the air against such surfaces 5
resulting in the absorption of such gases in the
portion I09 into the passageway 88 which com
municates with the duct 89 leading back into the
The cooling tower is preferably situated above
lower plenum chamber of the incubating enclo ‘the building in which the incubating enclosure is
10 sure. Interposed in the passageway 88 is a heat
ing element 13', preferably electrically operated,
through which all of the air must pass before
located, or is situated in any other desired loca- 10
tion where it will have a free circulation of air
therethrough. The pipe leading thereto connects
it is returned to the incubating enclosure. Such ' with a plurality of overhead spray nozzles I27
heater is controlled by the dry bulb thermostat
16 T, as described of the heating element ‘II in the
preceding embodiment. It will be noted that said
heating element is located on the discharge side
of the fan F, posterior thereto with reference to
the direction of air flow, so that the-heat im
20 parted thereby to the air can have no in?uence
tending to heat the motor 58' and the bearings
of the fan.
A suitable rotary water pump P is also opera
tively connected with the motor shaft 94. Such
25 pump is preferably arranged within the con?nes
of the fan F, for securing a compact assembly, and
has its stationary housing supported on legs II3,
which are secured to a removable bottom plate
I I4 closing an opening in the bottom of the hous
discharging down into a collecting receptacle I28,
from whence the water is returned to the condi 15
tioning unit through the return pipe I24.
The circulation of air through the spray cham
ber of the tower is preferably controlled by a
thermostatically regulated shutter I29 disposed at
one side or end of the tower. This shutter is 20
constructed similarly to and operates like the
radiator shutters commonly employed on automo
biles, and hence a detailed description thereof is
not necessary. The thermally responsive mecha
nism thereof indicated at I29a is so adjusted that 25
on hot summer days the shutter will open wide for
allowing an unrestricted circulation of air through
the spray chamber, and on relatively cooler days
the shutter will restrict the circulation of air.
The tower unit CT functions in hot weather as a 30
cooling device or source of cold for holding the
temperature of the spray water in the condition
ing unit down to the point where it can exercise‘
the proper cooling and humidifying in?uence on'
80 ing portion I09. This opening is suiiiciently large
to permit the fan F and motor 58' to pass down
through the same, whereby, when it is desired to
remove this assembly it is only necessary to release
the impeller S from the upper end of the shaft 94
35 and to lower the motor and fan down through the circulated air, thereby avoiding the necessity 35
said opening. Water is drawn from the tank 54' of refrigerating apparatus for this purpose.
down through pipe Hi to the inlet port of the
The aeratorA may have a like arrangement of
pump P. Leading from the outlet port thereof is overhead spray nozzles I2'Ia discharging down
a pipe I H which divides at the T connection II8 into a collecting receptacle I28a. However, while
into the two branch pipes I I9 and I2I. The lat
this aerator is constructed and arranged so that 40
ter pipe extends up to a cooling tower CT and gases liberated therein are readily dissipated to
flow through this pipe is governed by an auto
the atmosphere, the spray water therein is ther
matically controlled valve I23. A return pipe mally insulated against temperature in?uence of
I24 leads from the bottom of the cooling tower outside atmosphere. This is effected by sheathing
back to the conditioning unit CI. The pipe II9 or enclosing the entire device with a porous heat 45
functions as a by-pass in shunt of the tower, con
retaining material I30. When the spray water
necting at its upper end with a thermally in _ from the conditioning unit is passing through the
sulated aerator A in which a spraying operation aerator the carbon dioxid and other gaseous con
takes place for dissipating to the atmosphere any tent absorbed in the spray water are liberated to
50 carbon dioxid or other objectionable gas which the atmosphere without having the water appre- 50
has been absorbed by the spray water in the con
ciably influenced by atmospheric temperature,
ditioning unit. A return pipe I 24a leads from the whereas when the water is passing through the
return receptacle of this aerator and connects cooling tower the gaseous content is liberated (the
with the return pipe I24 leading from the cooling cooling tower functioning as an aerator at this
55 tower. A spring pressure valve I25 may be inter
time) and at the same time'the water is cooled by 55
posed in the by-pass pipe H9 and a check valve the atmosphere. In extremely cold winter
I26 may be interposed in the return pipe I24 ~ weather it will usually be necessary to heat the
between the cooling tower CT and the aerator A. spray water and such is effected by anelectrical
Hence, it will be seen that when the automatic heating unit 11' disposed in the tank 54' and hav
60 valve I23 is closed, the entire supply of water ing its supply circuit controlled by an automatic 6°
from the pump I I2 is shunted around the cooling switch I 3|. The aerator A as illustrated is con
tower through the aerator A and returned directly structed to provide limited ventilation to the
to the conditioning unit. When the automatic atmosphere but is substantially heat insulated.
valve I23 is open all, or practically all, of the pump
I shall now describe the control apparatus by
65 water is circulated through the cooling tower CT which the aforesaid regulating operations are 65
and is then returned to the conditioning unit. performed. Disposed at any desired point in the
The return pipe I24 enters the conditioning unit system is a dew point thermostat H for sensing
at a point to discharge upon the ?uff screens 48', the dew point of the circulating air. Preferably,
so that a portion of the return water will cascade this instrument is located in the return air duct
70 down over these ?u? screens for maintaining the 34' or in proximitythereto where it will sense the 70
same in a wet condition and for wetting the fluff dew point of the air prior to the air entering the
caught thereon. A portion of this return water spray chambers 42’ and 43'. This dew point
is conveyed laterally through a branch pipe I24b sensing device may have different principles of
having spray ori?ces therein through which this operation .and ‘may be constructed in 'various
75 water is sprayed down upon the bailles 'II' at the ways. For example, accordinglto one principle 75
or operation, the air is brought into contact with
‘a relatively cool condensing surface which brings
It will su?ice to say that when the relay I43 is
energized, a circuit is completed over wires I54 to
about a condensation of the vapor content of the the heat control switch I3I for actuating said
air upon such surface, and the temperature of switch to control the operation of the heating
this condensate substantially at the time of pre
element 11'; that when the relay I49 is energized
cipitation is sensed as the dew point of the air. , a circuit is established over wires I55 to operate
According to another principle of operation, the the electromagnetic valve I02‘ for controlling the
air is brought into heat transferring contact supply of spray water to the well IIII ; and, that
with a coil through which a liquid coolant of
10 lower temperature is circulated, and the exterior
surface of such coil is finned and is so propor
; tioned in surface area that the precipitation of
" dew thereon raises the temperature of the coolant
approximately to the dew point of the air, where
15 upon this temperature of the coolant is sensed as
the dew point of the air.
Both principles of operation are fully disclosed
‘in the co-pending application ?led by myself
and Otto A. Labus on November 16, 1928, under
20 Serial No. 319,764, and inasmuch as the details of
such device in and of themselves form no part of
the present invention, I shall not describe the
same here. Assuming the last mentioned princi
ple of operation to be employed, it will suil‘lce to
25 say that a liquid coolant, consisting of water at a
when the relay I50 is energized a circuit is es
tablished over wires I56 to’ operate the electro 10
magnetic valve I23 for controlling the passing of .
spray water from the conditioning unit up into
the cooling tower CT.
Relays I48, I49 and 'I 50 are diagrammatically
shownin detail in Fig. 6A and as shown each has 15
a relay electromagnet I48a, HM and I50a respec
tively which electromagnets are energized when '
circuits are completed by the main contact I42
of the control switch device I43. These relays
have contact armatures I491), I491: and I50b re
spectively which when attracted by their respec
tive electromagnets engage contacts I54a, I55a
and I56a respectively to close the circuits there
by energizing the respective lines I 54, I 55 and I55
from the two supply wires I52 and I53. In ad
relatively low temperature, is continuously con
dition to these elements relay I49 is provided with
ducted through pipe I34 to an externally ?nned a holding armature element I490 which positively
heat transfer coil i35 extending in sinuated or
zigzag formation across the lower end of the re
80 turn air duct 34'. By the precipitation of dew
on portions of the surface of said coil, the tem
perature of the coolant circulating therethrough
is gradually raised substantially to the dew point
of the air. This coolant is then conducted
35 through pipe I35 to a chamber I31 in which a
thermally responsive element I38 senses the tem
perature of such coolant as the dew point of the
air. The coolant is discharged from said cham
ber through a pipe I39 connecting with the return
40 pipe I24 leading down from the cooling tower
CT. The thermally responsive element I38 has
any suitable operating connection “I, consisting
either of mechanical means or a liquid column,
with a main controlling contact I42 pivotally
mounted on a control switch device I43. Dis
posed to one side of said contact are two con
tacts I 44 and I 45, the contact I44 being ?exibly
or pivotally supported whereby in the initial
movement of the main contact I42 to the left a
50 circuit will ?rst be established down ‘through con
tact I44, and if the motion of the main contact
continues in this direction, the contact I44 will
be moved to the left for engaging the contact
I45 and establishing a second circuit down
through this latter contact.
The same arrangement of contacts I46 and I4‘!
is provided on the opposite side of the main con
tact I42, the contact I45 being movably sup
ported whereby it is first engaged by the contact
60 I42 and is thereafter moved over into engage
ment with the other contact I41 with continued
movement of the main switch contact I42 to the
right. Extending from the four contacts I 44 to
I41, inclusive, are four wires I44’, I45’, I46’ and
65 I41’, the ?rst three of which connect with re
lays I48, I49 and I50, respectively, the last wire
I47’ connecting with the relay I49. Current is
supplied to the control system through two supply
wires I52 and I53, the wire I52 connecting with
the movable control contact I42 and also con
meeting with one terminal of each of the three
relays I48-I50. The other supply wire I53 con
nects with other terminals of each of these re
lays. The speci?c construction of these relays
75 need not be described, as such are well known.
retains the contact armature H91: in circuit clos
ing position after the electromagnet I49b is de- ,
energized; electromagnet I49d in this relay, when 30
wire I48’ is energized by contact I42 moving to
energize contact I41, is energized and thereby '
withdraws holding armature element I49c and
permits armature I49b to retract and deenergize
the lines I 55 controlled by this relay.
The operation of this control apparatus is
substantially as follows:—-When the dew point
of the air falls to a particular point, such as‘a
half degree belowthe predetermined desired dew ,
point, the control contact I42 swings to the. left
and engages contact I44.
This establishes a 40
circuit from conductor I52 through contacts I42,
I44 and wire I44" to relay I49, resulting in the
latter being energized. Such operates through
the circuit I55 to open the spray water control
valve I 02 for admitting water from the tank
area 54' to the spray well IIII, whereupon spray
or an additional volume thereof, is projected
into the spray chambers 42', 43' from the im
peller S. The tendency of this spray is to bring
the dew point of the air back to its desired value.
This automatically controlled supply of spray
water with a lowering of the dew point may be
regarded as the initial or primary corrective‘
operation for bringing the dew point back to its
desired value. If this initial corrective operation
failsto ‘stop the lowering of the dew point, the
control contact I42, in continuing to move to the
left, will swing the contact I44 over into engage
ment with the contact I 45, thereby completing
a circuit through wire I45’ to the relay I48.v The
energization of such relay operates through the
circuit I54 to actuate the switch I3I and energize
the heating element 11' for heating the‘ spray
water. Such constitutes the secondary-correc
tive operation for restoring the dew point to its
desired value, such operation occurring when the
dew point has fallen say 1 degree from .its de- '
sired temperature. The heating of the vspray
water is quickly effective to raise the dew'point. 70
As the control contact moves back towards
its, intermediate position and the pivoted 0r
?exible contact I44 is allowed to move away from
the contact‘ I45, the relay I48 is deenergized and
the heating 'of the spray water is discontinued. 75
9,187,996 '
The switch element of the relay I49 is to con
structed that it will remain closed after the con
trol contact I 42 has backed away from the con
tact I“, thereby resulting in the continued ener
gization oi' the electromagnetic valve I02 and the
continued supply of spray water to the well It".
When the dew point rises, say a half degree, the
control contact I42 in engaging the contact I46
energizes the relay I50, thereby resulting in the
10 electromagnetic valve I23 being operated to di
rect the spray water from the pump P up into
the cooling tower CT. Such constitutes the pri
mary or initial corrective step for lowering the
dew point, it being evident that the cooling in
15 ?uence of the tower on the spray water will tend
to lower the dew point. If the dew point con
tinues to rise, say to one degree above its de
sired temperature, the control contact I42 swings
the contact I46 over into engagement with the
20 contact I41, thereby completing a circuit down
through wire I 41' to the relay I49. The circuit
through such wire energizes a secondary wind
ing in the relay I49 for moving the switch ele
ment to open position, it being remembered that
this switch element was left in closed position
when the control contact I42 separated from the
contact I44.
In consequence, the circuit through wires I55
is opened and the valve I02 is closed for cutting‘
30 oil‘ the further admission of spray water to the
well I III .
The ‘resulting subsidance of spray in
the chambers 42’, 43' constitutes the secondary
corrective step or operation for bringing a rela
tively high dew point down to its desired value,
35 such operation quickly effecting a lowering of the
the conduit 86' can connect with the passageway
88 or return duct 89.
In summarizing the steps or operations in
volved in the treatment of the circulating air,
as effected by this latter embodiment of the in $1
vention, it will be seen that the dew point of the
air is sensed by the sensing device H which,
through its control apparatus, regulates the hu
midity by governing the projection of spray into
the chambers 42', 43’, or, under ‘certain condi 10
tions, by increasing or decreasing the tempera
ture of the spray water. The temperature of
the air, i. e., its dry bulb temperature, is main
tained between very close limits through the in
strumentality of the dry bulb thermostat T 15
which, under one condition, effects the direct
heating of the air, and, under another condition,
e?ects'the cooling of the spray water for reduc
ing the temperature of the air. For extracting
carbon dioxid from the air, lime may be utilized 20
as described of the preceding embodiment, al
though the absorption of the carbon dioxid in the
spray water will most generally be adequate to .
remove all of the carbon dioxid content of the air.
Such is particularly true in the present embodi 25
ment owing to the use of the cooling tower and
aerator A.
That is to say, because of the difference of
carbon dioxid partial pressure between the cir
culating conditioning air and the spray water, 30
the water will absorb the carbon dioxid, and
then when the spray water is circulated up
through the cooling tower CT or through the
perature of the air. The dry bulb thermostat,
aerator A the atmospheric air will absorb this
carbon dioxid from the spray water because of
the difference of partial pressures between the
atmosphere and the carbon dioxid content of the
spray water. With the giving up of the carbon
dioxid from the spray water to the atmospheric
air, oxygen will take its place in the spray water 40
diagrammatically indicated at T, is preferably
the conditioning system with the spray water
dew point. For extreme
inter operation, the
circulation up to the cooling tower CT can be shut
off by closing a valve I60 in the pipe I2I.
The dew point control is'correlated with a dry
40 bulb temperature control for governing the tem
located in the incubating enclosure as described
of the preceding embodiment, although it will be
45 understood that such thermostat may be dis
posed at any other point in the air circuit. A
control contact I58, governed by the thermally
responsive means of the device, is adapted with
a falling air temperature to engage contact I6I,
50 and with a rising temperature to engage contact
When the control contact engages terminal
within the device CT or A and will be returned to
serving as the conveying medium. This will fol
low by reason cfiany difference of partial pressure
of oxygen between the outside atmospheric air
and the conditioned air circulated through the
system. Even when no spray is being projected
by the spray device S water is nevertheless being
circulated through either the cooling tower CT or
aerator A, and the return water therefrom pro
jected by return spray pipe I24b down upon the 50
I GI , a circuit is completed through a relay or
baiiles ‘II’ provides for absorption of carbon di
directly with the heating element ‘I3’ which
oxid and other objectionable gases in such return
spray and on the surfaces of said baffles. Hence,
the continuous circulation of the spraying water
raises the temperature of the air as it is being
circulated back into the incubating enclosure.
When the air temperature rises to a predeter
mined point, the engagement of the control con
tact I58 with the terminal I62 completes a cir
cuit through wire I64 to energize the relay I50.
60 Such results in the opening of the valve I23 for
directing the spray water from the pump P up
to the cooling tower CT. The consequent lower
ing of the temperature of the spray water oper
ates to lower the temperature of the air delivered
65 to the incubator and hence the temperature of
the incubator.
Ozone is supplied to the system from an ozone
generating machine G which communicateswith
70 the conditioning unit CI at a point on the dis
charge side of the spray chambers 42' and 43’.
In the arrangement illustrated, ozone, in the
proper proportion, is conducted from the ma
chine G through conduit 86' to the passageway
76 I06, although it will be obvious that, if desired,
through the cooling tower and aerator provides
for continuous dissipation of carbon dioxid and
other objectionable gases to the atmosphere and
the continuous resupplying of oxygen to the sys
tem without the necessity of a foul air outlet and 60
a fresh air inlet, whereby the system may be
maintained completely closed so that a consid
erable saving is effected in heating or cooling the
air, and a more accurate regulation of tempera
ture and humidity is obtained.
In Figs. 3 and 4, I have illustrated another,
manner of carrying out my invention, wherein
the air supplied to the incubating eggs is handled
more or less separately from the air supplied to
. the hatching eggs.
When the eggs reach the hatching period, such
usually corresponding to the last three days of
incubation, they are placed in a separate hatch
ing enclosure 1’. Such enclosure is preferably
arranged within the main housing of the incu
mechanism actuated by the humidity sensing~
hating enclosure, but is partitioned oil’ therefrom
by an end partition I12 and doors I13 closing
instrument H’; .It will hence be seen that when"
the sides of the hatching enclosure and opening - the 'inclubating air is at the desired humidity,
into the aisles “22., In such arrangement, the con
ditioning unit CI only handles the air circulat
ing through ‘the hatching compartment I’. To
this end, the vduct 34'. leading to the conditioning
the .twoivolumes of air are circulated through
their respective conditioning units as' separate
entities, but when the humidity of this incubat~
ing'air falls below its desired value, some of the
unit may communicate with the upper end of
the enclosure I’ below the false ceiling 25, or the
humidi?ed air from the hatching cycle is trans-‘
ferred to the-incubating cycle to make. upsuch
10 upper plenum chamber ‘ZS-may be partitioned oil
to provide a separate plenum chamber 26', com
municating solely with the upper end of' the
de?ciency in humidity.
If desired, the conditioning" unit CI may oper
ate exactly as described ofthe construction shown
hatchingcompartment I’, in which case the con
in Fig. 6. In such event, the dry bulb thermostat
duit 34' will connect with this separate plenum _ T would be disposed in the hatching compart-'
chamber 26'. Similarly, the return duct 99 may
communicate with the lower end of the hatching
compartment 1', or may communicate with a
separate plenum chamber 3|’ partitioned oil‘ from
the main plenum chamber and communicating
20 only with the lower end of thehatching com
The air circulating through the incubating
eggs is handled by a separate conditioning unit,
designated C2 in its entirety. As shown in Figs.
3 and 7, such conditioning unit is preferably
structurally combined or directly associated with
the conditoning unit CI, comprising a single air
passageway I15 de?ned between the side wall
ll’ of the unit CI and an outer casing wall I16.
The upper end of said passageway communi
cates with a duct I11 which connects with the
main upper plenum chamber 26, and the lower
end of the air passageway I15 communicates with
a duct I18 which connects with the main lower
plenum chamber 3i, whereby the air rising
through the incubating eggs is circulated through
the upper plenum'chamber 25, down through the.
conditioning passageway I15 and back through
the duct I19 into the lower plenum chamber 35
40 for repeated circulation up through the eggs.
Interposed in the passageway I15 is an electric
heater 13" for heating the air. Such heater is
controlled by a dry bulb thermostat T’ disposed
either in the incubating ‘compartment of the
enclosure, or in the return air duct. Such con
trol may be effected substantially as described
of the dry bulb thermostatic controls T,’ T of
the preceding embodiments. Continuous air
circulation is maintained by a blower or fan F’
ment I’, as shown in Fig. 4, or in one of the ducts 15
communicating therewith, for controlling the dry
bulb temperature of the air, and the dew point
sensing instrument H would govern the pro
jection of the spray, the heating of the spray
water by the electric heating element 11, and 20
the cooling of the spray water by circulation
through the cooling tower CT as heretofore de
scribed and shown with reference to Fig. 6.
However, by way of illustrating a modi?ed ar
rangement, I have shown in Fig. 7 a slightly 26
di?erent method of controlling the conditioning
operations occurring in the unit CI. The con
trol of the dry bulb temperature of the air is
effected in substantially the same manner pre
viously described in connection with Fig. 6, but 30
the control of the humidity is effected in a dif
ferent manner.
The pump P forces spray water
through the pipe II1 up to the cooling tower CT,
but the 110w of water up to the cooling tower‘is
governed by a valve I89 operatively connected to 35
be controlled by a ?oat I9I. This ?oat responds
to the level in the water tank 54', and when such
level exceeds a predetermined maximum the ?oat
opens the valve I89 for permitting water to be
forced up to the cooling tower CT. When the
?oat controlled valve is closed, a by-pass circu
lation occurs through a spring controlled vlave
I92 connecting with a pipe I93 extending up to
the spray pipe I93’ which discharges down upon
the bailies ‘H’ which are disposed at the upper
end of the second spray chamber 49’. Thus dur 45
ing all the time that a by-pass circulation is oc
curring through pipe I93 water is. being sprayed
upon these baiiies 1i’, and likewise during all the
time that water is being returned from; the cool‘
ing tower CT, through return pipe I'M, water is
also being sprayed upon the ?uff screens £48’.
operatively connected with an electric motor I83,
such fan or blower being preferably disposed at
the lower end of the passageway E15 for dis
charging into the return duct I18.
In such embodiment the cooling tower CT has a
The humidity of this secondary volume of air
circulated through the conditioning unit C2 is
governed by drawing humidi?ed air from the
relatively large storage reservoir for retaining a
large volume of relatively cool water.‘
The return pipe I24 leading back from such 65
first volume of air circulated through the condi
reservoir to the conditioning unit has a regulat
tioning unit Ci. As shown in Fig. 7, this can be
accomplished by providing an opening I86 be
ing valve I93 interposed therein and responsive
to humidity conditions in the hatching compart
60 tween the return duct 89» and the lower end- of
the passageway I15, and controlling such open
ing by a louvre I85 responding to humidity con
ditions in the incubating‘ compartment of the
The humidity sensing in such compartment
may be effected by a hygrostat, a wet bulb ther
mostat, or a dew point thermostat, either being‘
ment. This humidity condition may be sensed
by a dew point sensing instrument H as illus
. trated in Fig.. 6, or by a hygrostat or wet bulb
thermostat. The control connections between
such humidity sensing instrument and the valve
I94 may be electrical, as described of the valve
I23 in Fig. 6, or they may be of any other desired
type. The arrangement is such that when the
generally indicated at H’ in Fig. 4, and being set‘ ' humidity ‘of the circulating air rises above a pre
to maintain the desired humidity on the incubat
determined value, the valve I94 is opened for I
ing compartment. The control connections be
allowing some of the relatively cool water from
tween such sensing instrument and the louvre the‘cooling tower to ‘discharge down into the 70
damper I95 may be of any desired electrical or ' conditioning unit over-the ?u? screens 48’ and
pneumatic type, the element I81 in Fig. '7 repre— at the same time over the bailles H’ by way of
senting an electromagnetic motor device for ac
pipe I93 and spray pipe I93’. The lower tem
tuating the damper under the control of switch perature of this water has'the e?ect of imme
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