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Патент USA US2129202

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Sept. 6,1938.
'
M. K. DREWRY
‘
AIR
CONDITIONING
2,129,202
SYSTEM
‘
Filed Sept. 18, 19:53
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2,129,202
Patented Sept. 6, 1938
UNITED STATES
PATENT OFFICE
2,129,202
AIR CONDITIONING SYSTEM
Montrose K. Drewry, Milwaukee, Wis.
Application September 18, 1933, Serial No. 689,935
15 Claims. (Cl. 257—3)
This invention relates in general to air con
ditioning systems and particularly to apparatus
for conditioning air and circulating it through
enclosed
spaces.
'
.
An object of the invention is to provide a
simple and e?ieient airv conditioning apparatus
for regulating the temperature and humidity
conditions of the air in a building.
Another object of the invention is to provide
10 an air conditioning'system that is arranged to
operate e?iciently and with minimum attention.
Another object of the invention is to provide
an air conditioning system having means for
automatically regulating the rate of combustion
v‘of fuel and the rate of circulation of air in ac
cordance with conditions in the space being
served with conditioned air;
‘
A further object of the invention is to provide
of rectangular shape associated with a heating
furnace or boiler 2. The air conditioning ap
paratus is preferably located in the basement of
the building to be served and the conditioning
chamber I may be supported conveniently from 5
the basement ceiling, as shown. Air to be con
ditioned is drawn from the rooms of the build
ing being served into one or more intake regis
ters 3 and through associated intake pipes or
10
ducts! into the conditioning chamber I.
A partition 75, disposed in a vertical medial
plane of the chamber 1 and extending from the
top downward to near the bottom thereof, di
vides the chamber into an intake compartment
6, to the top of‘ which the intake pipes 4 are
connected, and a discharge compartment ‘I. The
partition 5 constrains the ?ow of the incom
ing air and directs it downward through a ?lter
8 arranged horizontally in the intake compart
ment
6 in position to remove dust and other‘ 20
system in which, while the system is used‘ for
cooling purposes, the boiler is operated to heat foreign particles from the air. From the ?lter,
storage water and is at all times prepared to ' the air ?ows downward to the bottom of the
a new method of operating a heat exchange
compartment 5 and thence horizontally through
take on‘ a heating load.
According to the present invention, air con
25 ditioning apparatus having an air circulating
system is provided with an air cleaner, a humidi
?er and a heat exchanger adapted to heat orv
cool the air as conditions may require. For
a connecting passageway beneath the lower end
of the partition 5 into the compartment 1.
At‘the bottom of the compartment 1, there is
arranged a humidifying tank or pan 9 that
presents a surface of warm water to the in
heating the air, a boiler provided with an auto
matic fuel feeding hopper is connected to the
fiowing ?ltered air from which the air absorbs
in the boiler and the rate of circulation of air
in the circulating system in accordance with
heat or cool the air, according to the require
ments of weather conditions, as it ?ows upward
in the compartment 1. From the top of the com
a predetermined amount of moisture.
,
30
Above the humidi?er 9, there is arranged a
heat exchanger, and automatic means are pro
vided for regulating the rate of combustion of fuel I heat exchanging radiator ID that functions to
35
temperature conditions in the space‘being heated.
Flue gases are drawn through the fuel in the
partment ‘I, the air ?ows into outlet pipes ll
hopper to condition it for feeding by gravity and
to improve its qualities for combustion. In
warm weather, cold water is circulated through
through which it is delivered to one or more
discharge registers It.‘ in the rooms of the build
ing being served, the air circulating system func
the boiler may be utilized for heating service
furnace.
tioning, in general, in much the same manner 40
40 the heat exchanger to cool the air and to con
dense excess moisture out of it. coincidentally, - as the circulating system of‘ the usual warm air
water.
,
The foregoing and other objects of the inven
.' tion may be achieved by the air conditioning
system described by way of example in the fol
lowing part of ‘this speci?cation in conjunction
with the accompanying drawing, in which the
single ?gure is a view, partly in side elevation
and partly in vertical section, of apparatus em
bodying the invention installed in the basement
of a building.
‘
The illustrated air conditioning apparatus
coupriseS, in general, an air circulating system
including a conditioning chamber or cabinet I
'
The heat exchanger ‘I0 is of the ?n-ahd-tube
type, having an inlet manifold or header l3
which is connected by an inlet pipe I‘ to the
upper part of ‘the boiler 2 and from which a
bank of ?nned tubes l5 extends horizontally
across the compartment 1 to a return header l6.
From the return header IS, a second bank‘ of
finned tubes I‘I extends across the compartment 50
beneath the tubes l5 to a discharge header l8
which is connected by a return pipe l9 to the
lower part of the boiler 2. The tubes l5 and
II are so spaced and positioned that the air,
in ?owing upward through the heat exchanger,
2
9,129,202
?rst passes between the tubes I‘! of the lower
bank and then passes between the tubes ii
of the upper bank.
As shown in the drawing, the heat exchanger
I0 is arranged substantially at the level of the
top of the boiler 2 to facilitate the circulation
of hot water from the boiler through the water
circulating system. In cold weather, when the
system is being used for heating the building,
10 hot water from the top of the boiler 2 ?ows hori-'
zontally through the inlet pipe l4 into and
through the upper tubes l5 and then back
through the lower tubes l’! of the heat exchanger
I 0 in series relation, giving up a. portion of its
15 heat to the air in the compartment ‘I. The water
then ?ows from the heat exchanger into the ver
tically arranged return pipe I! and thence back to
the bottom of the boiler.
As the column of relatively cool water in the
20 vertical return pipe I9 is heavier than the cor
responding column of hot water in the boiler, it
descends by gravity, causing circulation by nat
ural convection or thermo-syphon action through
the heat exchanger. Because the heat exchanger
25 is positioned substantially level with the top of
the boiler, the column of cool water in the re
turn pipe I 9 is of. su?icient height to cause ef
fective thermo-syphon action in the system.
The air in the circulating system likewise is
80 caused to circulate by thermo-syphon action, the
heated air in‘the compartment 1 rising into the
outlet pipes H and being replaced by cool air
from the compartment 6. To effect circulation '
. of the air by thermolsyphon action it is desirable
35 that the heat exchanger be placed as low as.
possible in the air circulating system in order that
mally closed by a close-?tting removable cover
26. The ?ue gases resulting from combustion of
the fuel are conducted from the ?rebox by a
smoke-pipe 21 that discharges into a chimney
28.
A relatively small pipe 29 is connected between
the smoke-pipe 21 and the upper part of the
fuel hopper 24 for conducting ?ue gases from the
smoke-pipe into the top of the hopper to be
drawn downward through the fuel by the natural
draft of the ?rebox to condition the fuel for feed-'
ing and burning. The ?ue gases passing through
the hopper, together with heat conducted from
the boiler to the hopper, act upon the fuel there
in in such manner that water vapor and certain
gases are driven off and the fuel is otherwise so
modi?ed as to prevent burning or clogging there
of in the hopper or caking upon ?owing from
the hopper into the ?rebox. The conditioned fuel
flows into the ?rebox by gravity continually and 20
automatically at the rate at which it is required
to replace the fuel consumed, thus maintaining a
uniform bed of burning fuel on the ?rebox grate
at all times.
An opening 30 is provided in the side of the 25
?rebox above the level of the fuel bed therein for
introducing auxiliary air into the combustion
chamber. To control theamount of auxiliary
air introduced, the opening is provided with an
adjustable cover 3|. The opening 30 ‘may be 30
utilized for starting the ?re when the hopper
contains a supply of fuel, as kindling materials
may be inserted through it into the ?rebox and
ignited. A further function of the opening 3|!
is to permit observation of the condition of the 35
?re.
the column of‘ heated air may be of sufficient
The rate of combustion of fuel in the ?rebox
height to establish a difference in weight between _ and the rate ‘of heating resulting therefrom is
it and the corresponding column of cold air great regulated by a thermostat 32 so located as to be
40 enough to provide pressure for effective circula
responsive to the temperature of the air in the
tion. By positioning the heat exchanger at the rooms being heated and arranged to be regulated 40
level of the boiler top, the conditions necessary to maintain the air in the rooms at a predeter
for thermo-syphon circulation of both the water mined desired temperature. The thermostat 32
and the air are met in manner to effect equally . is connected to a thermostat motor 33 in such
45 satisfactory circulation of each.
manner as to energize it in response to changes
The boiler 2 is provided at its top with an ex
in the room temperature. The thermostat motor 45
pansion tank or chamber 20 that serves as a 33 is connected, by a continuous chain“ carried
. storage reservoir for water which may be forced by pulleys 35, to operate a. draft door 36 ar
out of the boiler when the water therein is ex
ranged to control the admission of air into the
panded by heat. The tank 20, being open to the ?rebox beneath the bed of fuel therein, and to
atmosphere, also permits the escape of air or operate a check door 31 arranged to control the 50
' steamthat might otherwise interfere with the admission of air into the base of the chimney 28
circulation of the water through the system, for checking the ?re.
.
should the pipe i4 become air~bound or steam
When the temperature of the air in the rooms
55 gound by reason of becoming ?lled with either being heated falls below the predetermined de
uid.
sired temperature for which the thermostat is
An adequate supply of water is automatically set, the thermostat and its associated motor
maintained in the boiler at all times by means function to close the chimney check door 31 and
of an inlet valve 2! that controls the in?ow of to open the draft door 36, thereby increasing the
60 water from a supply pipe 22 to make up for ’ draft through the ?rebox and increasing the
water lost by evaporation or otherwise. The valve rate of combustion of fuel to furnish additional 60
2| is actuated automatically by a ?oat 23 resting heat to the boiler water.
on the surface of the water in the expansion tank.
The boiler is provided with a water temper
The ?oat 23 covers substantially all of the sur
ature regulator 38 that includes a thermo
face
of
the
water
in
the
tank
and
greatly
reduces
65
expansion element 39 disposed in contact with
the absorption of air by the water when it cools the water in the boiler and connected by a link 65
below its boiling temperature, thereby avoiding ‘ 40 to a pivoted lever arm 4i on which is slidably
corrosion of the interior of the water circulating mounted an adjustable counterpoise weight 42.
system apparatus by air dissolved in the water.
As the temperature of the boiler water increases
Fuel for combustion in the ?rebox of the boiler/ in response to the action of the thermostat 32,
2' is fed into the‘ ?rebox automatically by gravity the thermal expansion element 39 expands and 70
from an air-tight fuel hopper 24 mounted on one pivots the lever arm 4!, lifting the weight 42.
_ side of the boiler.‘ The hopper 24 may be ?lled When the water temperature reaches a prede
periodically with solid fuel such‘ as coal or coke
75 through an opening 25 in ‘.ts top which is nor
termined value, the lever arm 4| is pivoted to '
such position that "an electrical switch 43, pref
3
2,129,202
erably of the mercury type, mounted on the lever
arm 4| closes and completes an electric circuit
that leads from a power line 44 through conduc
tors 45 to a motor 46 connected to a fan 41 dis
5 posed in the lower part of the intake compart
ment 8. The fan is so directed as to increase the
circulation of air through the system by forcing
air from the intake compartment 6 into the dis
charge compartment 1 and upward through the
10 heat ‘exchanger iii. The increased circulation
" of air through the heat exchanger results in con
veying additional heat from the hot water circu;
lating through it and consequently tends to re
' duce the temperature of the water in the boiler.
15 The additional heat transferred from the boiler
water is conveyed by the air to the rooms being
heated and raises the room temperature in re
sponse to the functioning of the thermostat 32.
When the predetermined normal temperature
20 in the rooms is restored, the thermostat 32 actu
ates the thermostat motor 33 to cause it to close
the draft door 36 and to open the check door 31,
thereby decreasing the rate of combustion of fuel
in the ?rebox and reducing the amount of‘ heat
25 supplied to the boiler.
‘
When the temperature of the water in the
boiler becomes reduced below a predetermined
value, as a result of the action of the fan and
of the reduced rate of combustion of fuel cf
30 fected by the thermostat, the thermal expansion
element 39 contracts and permits the weight 42
to pivot the lever arm 4| in such manner as to
open the switch 43 and stop the fan motor 46,
thereby reducing the amount of heat supplied to
35 the rooms and preventing the room temperature
from exceeding the predetermined maximum.
If the predetermined normal temperature in
the rooms is not restored within a short time,
the temperature of the boiler water will con
40 tinue to increase while the fan 41 is operating
in spite of the cooling eifect of the fan, and the
water temperature regulator 38 will function,
through a connection with the draft and check
doors, to reduce the rate of fuel combustion and
45 prevent overheating of the boiler water. This
action of the water temperature regulator will
occur regardless of the fact that the thermostat
motor 33 may be tending, at the time, to increase
the rate of fuel combustion.
To enable this result to be accomplished, the
50
continuous chain 34 of the draft regulating
mechanism is connected to the draft door and to
the check door by means of pulleys 48, one of
which ismounted on each door, the pulleys being
55 arranged to rotatably receive the chain. The
run- of the chain at the sides of the pulleys 48
.opposite from the run thereof that is connected
to the thermostat motor 33, is attached to the
end of the lever arm 4|, as shown. When'the.
60 temperature of the boiler water exceeds a pre
determined maximum, .the lever arm 4| of the
temperature regulator 38 is moved to the posi
tion shown in the drawing and in so doing actu
ates the chain 34 to close the draft door 36 and
G5 to open the check door 31 independently of the
action‘ of the thermostat motor '33. As the ther
mal expansion element 39 which operates the
arm 4| expands or contracts in accordance with
‘
temperature changes of the water in the boiler,
70 its vaction causes the temperature regulator 38
to actuate the draft door and the check door in
modulating manner to maintain the temperature
of the boiler water substantially constant. This
arrangement prevents overheating of the boiler
75 water and prevents the formation of excess
steam which would otherwise interfere with the
circulation of the water through the heat ex
changer III by steam-binding the pipe l4.
,
The water temperature which the regulator
38 will tend to maintain in the boiler and the
temperature at which the fan motor will be
started or stopped, may be regulated by adjust
ing the position of the weight 42 along the lever
arm 4|. An incidental effect of this adjustment
is to regulate the amount of time during which 10
the fan 41 will operate under given conditions.
For example, if the weight 42 is set to maintain
relatively high water temperature the fan will
not operate as much of the time as it will in de
livering an equal amount of heat when the 15
weight 42 is set to maintain relatively low water
temperature.
The smoke-pipe 21 is made air-tight in order
that the ?ue gases it conducts to the chimney
28 may surrender the maximum amount of heat 20
to the basement air and thus decrease fuel costs.
Ordinarily, in the usual furnace installation a.
check door is located in the smoke-pipe near the
boiler, but the air it admits at this location so
cools the ?ue gases passing through the, smoke 25
pipe that most of the ?ue gas heat is wasted, by
escaping up the chimney. Also, deterioration of
the smoke-pipe is ordinarily more rapid when air
is admitted to it than is the case with the air
tight design illustrated in the drawing.
30
For heating service water, an indirect water
heater 49 is connected in a minor circulating sys
tem paralleling the main circulating system
through the heat exchanger. This minor circu
lating system includes a pipe 58 leading from the 35
pipe M at the top of the boiler to the heater 49,
and a pipe 5| leading from the heater to the return
pipe l9 near the bottom of the boiler. The serv
ice water circulates from the bottom of a hot
water storage tank-.52, through a pipe 53 upward 40
into and vthrough a heating coil in the heater 49
and thence through a pipe 54 into the top of the
storage tank. Water is supplied to the bottom of
the hot water storage tank 52 through a pipe 55
that is connected to the supply pipe 22, and hot
water is delivered from the top of the tank
through a pipe 88 that leads to the various posi
tions throughout the buildingatwhich the hot
water is utilized.
Circulation of water from the boiler through 50
thetheater 48 occurs because of the fact that the
temperature of the water is lowered in imparting
heat to the service water in the heating coil.
Consequently, the column of water in the vertical '
return pipe 5| is cooler and denser than a corre 55
sponding column of water in the boiler, and the
cool water column descends through the pipe 5|
by gravity, causing circulation by natural convec
tion.
The circulating water in the pipe 5| is utilized 60
to provide heat for evaporating the water in the
humidifying tank 9. As shown, the humidi?er is
provided with a submerged heating coil 56 into
which water may ?ow from the pipe 5| through a
pipe 51 and from which it ?ows through a pipe 58 65
to the return pipe l8. The ?ow of water through
the heating coil 55 may be regulated by a valve 59
in the pipe 51 and a valve 68 arranged to close the
portion of the pipe 5| between the pipe 51 and the
pipe l9. By manipulating these valves, the tem 70
perature of the water in the humidi?er may be
controlled, thus regulating the rate of evaporation
of the water and the humidi?cation of the air cir
culating through the conditioning chamber. As
a further means of controlling the action of the a
4
2,129,202
humidi?er, the amount of water surface exposed
to the air may be regulated by covering a portion
of the tank 9.
-
_
The level of the water in the humidifying tank 3
is maintained substantially constant by a float
operated valve 6! which automatically admits
water from a pipe 62 that is connected to the
supply pipe 22 to replenish water evaporated in
humidifying the air. To prevent corrosion of the
10 humidi?er or the formation of scale therein,
chemicals of the nature ordinarily utilized in
steam boilers for such purposes may be added to
the water.
‘
1
In front of the fan 41 and over the humidifying
15 tank 9, there is arranged a series of directing
vanes 63 that turn the circulating air uniformly
upward into the heat exchanger ill with minimum
loss of energy.
_
6
Auxiliary air may be introduced into the cir
20 culating system through an auxiliary air intake
pipe 64 extending from the intake compartment 6
out of doors for admitting fresh outside‘ air and
having a damper 65 for controlling the volume of
air admitted. A second auxiliary air intake pipe
25 '66 ‘opening into the basement is connected to the
compartment 6 and is likewise provided with a
damper 61 for controlling the volume of air
admitted from the basement into the system.
During warm weather the air conditioning. sys
30 tem is utilized for cooling and drying the air in the
building. To adjust the system for this mode of
operation, a valve 68 in the pipe l4 and a valve 69
transfer wherein the warmest air comes in con
tact with the warmest tubes and the coolest air
passes over the coldest tubes, the arrangement
which is generally recognized as the most e?icient
for the transfer of heat between ?uids.
Dining the period in which the apparatus is
being used to cool the air, the supply of water
to the humidi?er 9 is interrupted by closing a
valve ‘I1 in the pipe 62, and the water is drained
from the tank by opening a valve 18 in a drain
pipe 19. When the warm air from the rooms
comes in contact with the cold tubes of the heat
exchanger, the excess water vapor in the air
condenses upon the surface of the tubes, thus re
ducing the humidity of the air. The moisture 15
which collects on the tubes drips into the humidi
?er tank 9 and is drained away through the‘
open drain-pipe ‘I9.
While the air circulating system is being uti
lized to cool the air in the building, the boiler 2 20
may be used for heating the service water. To
provide automatic regulation of the service water
temperature, the thermostat 32 is rendered inop
erative by_ adjusting it to a high temperature
setting, in which position it will tend to hold the 25
draft door 36 open continuously and to hold the
chimney check door 31 closed continuously. The
adjustable weight 42 on the water temperature '
regulator 36 is then so positioned that the regu
lator 38 will operate to close the draft door 36 30
and open the check door 31 in opposition to the
tendency of the thermostat when the desired
service water temperature is attained. The regu
changer »ID from the boiler, leaving the minor, lator thus adjusted will maintain a low ?re in
35 circulating system through the service water'
the firebox to heat the service water to a pre
in the pipe I9 are closed to isolate the heat ex
heater 49 connected ‘to the boiler. Cold water
from the supply pipe 22 is then admitted to the
heat exchanger through a pipe 10 having a control
valve ‘II which leads into the pipe I4. ' From the
pipe l4 the water ?ows through the upper bank of
tubes l5 of the heat exchanger to the header l6
and then back through the lower bank of tubes I'I
into the header is and the return pipe I 9 from
which it escapes through a discharge valve 12 into
45 a discharge pipe 13. 'Ordinarily, the water dis
charged through the pipe 13 is put to‘ some useful
Purpose, as for supplying a fountain and pool or
for watering the lawn or garden, such use being
suggested by a faucet 14 which is provided at the
50 end of pipe 13 that ‘extends out of doors for
attaching 'a hose. Refrigerated water or other
.cooling ?uid may be circulated through the heat
exchanger instead of water from the usual city’
supply.
.
For circulating the air through the circulating
system while the cold water is passing through the
heat exchanger, the fan motor 46 is operated to
drive the fan 41 continuously. To provide for
selectively operating the fan motor 46, a manually
60 operated push-button switch ‘I6 is arranged to
connect the conductors 45 which lead to the motor
» directly to the power line 44.
Another push
button switch 16 is arranged in the circuit of the
determined temperature without further atten
tion to the apparaus other than re?lling the fuel
hopper 24, which ordinarily is necessary only at
weekly intervals. Should changing weather con
ditions, such as occur in the spring or in the 40
fall, make it desirable to change the mode of
operation of the apparatus from cooling to heat
ing because of a sudden drop in temperature,
it is merely‘necessary to shut off the flow of
cold water through the heat exchanger and re 45
connect it to the boiler by opening the valves 68
and 69. The hot water always available in the
.boiler provides instantv heating effect and the
continuously burning ?re can at once be placed
under the control of the thermostat 32 to bring 50
the air in the rooms to the desired temperature.
Although a speci?c air conditioning system has
been described in detail herein for the purpose of
clearly disclosing a practical embodiment of the
invention, itis to be understood that the particu 55
lar structure set forth is susceptible of modi?ca
tion without departing from the spirit and scope
of the invention as de?ned by the subjolned_
claims.
It is claimed and desired to secure by Letters 60
Patent:
'
1. An air conditioning system for serving a
mutants’ °f spaces commune av conditioning '
mercury switch 43 on the lever arm 4! and may be
chamber, a plurality of air intake pipes connect
while the system is being used for cooling.
The fan 41 forces the air upward ?rst through
ed to said chamber for drawing air to be con
65 opened to render the mercury switch inoperative
35
ditioned fromv said plurality of spaces being
served,
air inlet pipes connected to said.
the spaces between the lower tubes l1 and then chamberother
for admitting air from other sources,
through the spaces between the upper tubes I! of '
-70 the heat exchanger. In this manner the air ?rst means for controlling the amount of air admitted
through said latter inlet pipes, an air ?lter ar-,
comes in contact with and is cooled by the tubes ranged in said chamber in position to ?lter the 70
containing water that has been warmed some
what, and then the partly cooled air passes over air drawn through said inlet pipes, a humidifying
the tubes containing the cold water. This is in apparatus arranged in said chamber to humidify
75 accordance with the counter?ow principle of heat the ?ltered air, rcgulatable means arranged to
heat said humidifying apparatus for regulating
2,129,202
the humidifying action thereof, a heat exchanger
_ arranged in said chamber to heat said ?ltered and
, humidi?ed air and to cause it to circulate through
said chamber by thermo-syphon action, a plu
rality of delivery pipes connected to said cham
ber for receiving and distributing the conditioned
air to said plurality of spaces, a fan arranged in
said chamber for assisting the circulation of air
therethrough, and means operative in response
10 to conditions in said spaces being air conditioned
for controlling the operation of said fan.
‘2. An air conditioning system 4 for alternate
heating and cooling of an enclosed space, com
. prising a boiler for heating water, a heat ex
15 changer, means connecting said heat exchanger
to said boiler in such manner as to permit ?ow
of hot water from said boiler through said heat
exchanger by thenno-syphon action, an air con
dltioning chamber enclosing said heat exchanger,
5
in and to maintain a uniform fuel bed, and means
for conducting ?ue gases from said ?rebox
through the fuel in said hopper to condition it
for uniform automatic feeding into said ?rebox
whereby completely automatic space heating by
the combustion of solid fuel is effected.
4. A space heating system, comprising a boiler
for heating water and having a ?rebox provided
with, draft control dampers, a heat exchanging
radiator connected to the top and to the bot
tom of said boiler and disposed horizontally at
the level of the top of said boiler in position to ,
facilitate thermo-syphon circulation of water
therethrough, an air conditioning chamber hav
ing a vertically disposed compartment enclosing 15
said heat exchanging radiator and arranged to
direct air upward therethrough, air pipes con
necting said chamber to the space being heated
and arranged to facilitate thermo-syphon cir
culation of air through said radiator and into 20
through said chamber in contact with said heat said space being heated, a ?lter disposed in said
exchanger and into the space being served to heat chamber in position to ?lter the incoming air, a
said space, means for automatically regulating humidifying tank disposed in said chamber be
said boiler in response to conditions in the space neath said radiator to humidify the ?ltered air, 25
a fan disposed in said chamber and operative to
25 being served with conditioned air, a tank for stor
ing warm service water, a service. water heater accelerate the circulation of air through said
heat exchanging radiator, means responsive to
connected to be heated by said boiler and ar
ranged to supply warm water to said service the temperature of the water in said boiler con
water tank, means for closing said heat exchanger * nected to'cause said fan to operate when said 30
30 connecting means'to isolate said heat exchanger water attains a predetermined temperature and
from said boiler, means for circulating cooling connected to so regulate the draft control damp
?uid through said heat exchanger when isolated ers of said ?rebox .as to tend to maintain the
boiler water temperature uniform, and means
from said boiler to cool the space being served, responsive
to the temperature of the air in the
and means for automatically regulating the ?re
space
being
heated and connected to superim
35 in said boiler in response to the temperature pose its, action upon that of the water tempera
of the water therein in manner tending to main
regulator to so regulate the draft control
tain the water temperature substantially con— ture
dampers
of said ?rebox as to tend to maintain
stant to heat service ‘water automatically for
uniform temperature in said heated space.
storage in said service water tank while said heat
5. An air conditioning system for conditioning 40
20 means for circulating air being conditioned
40 exchanger is being utilized for cooling the con- ' air in a plurality of spaces, comprising a cabi
, ditioned air thereby keeping the ?re active and net of substantially rectangular shape provided
instantly available for heating. the space be
ing served upon opening the connecting means
between said boiler and said heat exchanger.
3. A space heating system for automatic heat
45
ing by the combustion of solid fuel, comprising
a boiler for heating‘ water and having a ?rebox
for burning solid fuel provided with draft con
trol dampers, a heat exchanging radiator con
50 nected to the top and the bottom of said boiler
and disposed substantially at the level of the
top of said boiler in position to facilitate thermo
syphon circulation of water therethrough, an air
conditioning chamber enclosing said heat ex
with a medially disposed dividing wall extend
ing from the top thereof downwardly dividing
the cabinet into an intake compartment and a 45
discharge compartment with a connecting pas
sageway along the bottom thereof, a plurality of
inlet pipes connected to the top of said intake
compartment for admitting air to be conditioned,
a ?lter arranged in said intake compartment be 50
neath said inlet pipes to ?lter said air, a fan dis
posed in said intake compartment beneath said
?lter and directed towards the connecting pas
sageway for circulating air through said cabinet,
a humidifying pan disposed on the bottom of the ,
changing radiator and arranged to facilitate discharge compartment in front of said fan in
thermo-syphon circulation of air through said position to receive an air blast therefrom, means
- radiator and into the space being heated, a fan
in said humidifying pan for heating water there
disposed within 'said chamber and operative to in to humidify the air blown over the water by
accelerate the circulation of air through said heat said fan, a heat exchanger disposed directly 60
exchanging radiator, means responsive to the above said humidifying pan in said discharge
temperature of the water in said boiler connected compartment for heating said air, and a plu
to cause said fan to operate when said .water rality of outlet pipes connected to the top of said
attains a predetermined temperature to acceler
discharge compartment for delivering the con
‘ate' the transfer of heat to the space being heated ditioned air to a plurality of spaces being served.
6. An air conditioning system for conditioning
'65 and for so regulating the draft control dampers
of said ?rebox as to tend to maintain the boiler air in a plurality of spaces in a building, com
water temperature uniform, means responsive to prising a cabinet divided by ‘a medial dividing
the temperature of the air in the space being wall into an intake compartment and a discharge
heated and connected to superimpose its action compartment connected by a horizontal passage
upon that of the water temperature regulator to along the bottom thereof, a plurality of air inlet
so regulate the draft control dampers of said
connectedto the top of said intake com
?rebox as to tend to maintain the temperature of pipes
partment and communicating with the plurality
said air constant, a fuel hopper disposed to auto
of spaces being conditioned for drawing air there
matically feed fuel by gravity into said ?rebox from, an auxiliary air inlet pipe connected to the 75
continuously to replace the fuel consumed there
6
2,129,202
top of said intake compartment and communi
9. A space heating system comprising a boiler
cating with the exterior of the building for ad
for heating water by the combustion of fuel and '
mitting outside air into the system, means for
controlling said auxiliary air inlet to regulate the having draft, control means, a lever pivotally
mounted on said boiler and connected to operate
amount of outside air admitted into the system, ‘said
draft control means, a thermo-expansive
an air ?lter arranged in said intake compart
ment beneath said inlet pipes in position to ?lter temperature responsive means associated with
said boiler and connected to-rock said lever in
air drawn into said intake compartment, a fan accordance
with changesin temperature of said
disposed in said intake compartment beneath said
10 ?lter and directed toward the horizontal pas boiler water to actuate said draft control in man
ner tending to maintain the temperature of said 10
sageway into the discharge compartment, a hu
midifying pan disposed in the bottom of said boiler water substantially constant; means respon
discharge compartment in position to receive a sive to the temperature of the space being heated
blast of air from said fan for humidifying said and arranged to change the connection between
15 air, a heat exchanger disposed in said discharge said lever and said draft control means upon the
compartment above said humidifying pan for temperature of said space falling below a prede 15
~ heating said air, and a‘ plurality of outlet pipes
connected to the top of said discharge compart
ment and communicating with the plurality of
20 spaces being conditioned for delivering condi
tioned air to said spaces.
I
7. An air conditioning apparatus adapted for
installation in the basement of a building for con
ditioning the air in other parts of the building,
termined minimum value to cause said tempera
ture responsive means to tend to maintain said
boiler water at a higher temperature than is
maintained when said space temperature is above
said minimum value, means controlled by said 20
pivoted lever for increasing the rate of delivery
of heat to the space being heated upon said boiler
water exceeding a predetermined temperature,
and a weight slidingly mounted on said pivoted
medial dividing wall separating it into an intake lever for adjusting the relation of said lever to
said thermo-expansive means to regulate the tem
compartment and a discharge compartment con
perature
of said boiler water and the operation of
nected by a horizontal passage along the bottom
thereof, an air inlet pipe ”connected to the top said heat delivery increasing means.
30 of said intake compartment and communicating
10. In a space heating system for closely regu
with the part of the building. being served to lated heating by the combustion of solid fuel, the
withdraw air therefrom for conditioning said air, combination with a boiler for heating water pro
an auxiliary air inlet pipe connected to the top vided with a ?rebox for the combustion of solid
of sad intake compartment and communicating fuel, of means for feeding solid fuel into said ?re35 with the exterior of the building for admitting box uniformly by action of gravity, means for»
regulating the draft of said ?rebox to control the
outside air into said cabinet, means for control
ling the amount of outside air admitted through rate of combustion of said fuel therein, means re
25 comprising an air conditioning cabinet having a
25
30
‘
35
said auxiliary inlet pipe, an auxiliary air inlet sponsive to the temperature of water in said boiler
opening in the top of said intake compartment and adapted to exert force for moving said draft
for admitting basement air into said cabinet, _regulating meansvin modulating manner in ac
means for controlling the amount of basement cordance with changes in the water temperature 40
air admitted through said auxiliary opening, an and proportionately thereto, means for adiust
a air ?lter arranged in-said intake compartment ing said water temperature responsive means to
change its range of movement relative to the tem
below said air inlets in position to ?lter the in
45 coming air, a fan disposed beneath said ?lter perature of said boiler water, adjustable operat-v
to circulate air from said intake compartment ing means connecting said water temperature re 45
into said discharge compartment, a humidii’ying sponsive means to said draft regulating means to
pan disposed in the bottom of said discharge enable modulating operation of said draft regu
compartment to'humidify-said circulating air, a lating means in accordance with changes of boiler
water temperature to control the rate of combus
50 heat exchanger disposed in said discharge com
partment above said humidifying pan to heat tion in said ?rebox in manner tending to main 50
said air, and an air outlet pipe connected to the tain said boiler water at a uniform temperature
determined by the adjustment of said water tem
top of said d'scharge compartment and commu
nicat‘ng with the parts of the building being perature responsive means, and means responsive
to the temperature of the air in the space being
55 served to deliver conditioned air thereto.
8. A heating system, comprising a'boiler for heated connected to said adjustable operating 55
means in manner to change the relation of said
heating water, a heat exchanger cabinet associ
ated with said boiler, a radiator disposed in‘ said water temperature responsive means to said draft
heat exchanger cabinet and connected to said regulating means to effect greater opening of said
boiler for transferring heat from said boiler to draft regulating means ‘when the air temperature
air in said heat exchanger, a humidifying pan falls below a predetermined minimum tending to 60
vvd'sposed in the bottom of said heat exchanger maintain said boiler water at a higher tempera
cabinet for evaporating water to humldify the air ture than obtainswhen said air temperature is
being heated. a heating coil in said humidifying above said predetermined minimum, and means
controlled by said watertemperature responsive
pan for heating water therein, a circulating sys
tem connecting said humidifying pan heating coil means for increasing the rate of heat movement 65
with said boiler, and a service water heating coil > to said space being heated upon the temperature
connected in saidxcirculating system near the of said boiler water exceeding a predetermined
top of said boiler and arranged to heat service maximum.
'70 water by transfer of heat from said boiler water, 11. A space heating system comprising a boiler
whereby circulation of boiler water through said for heating water by the combustion of fuel, a 70
heat exchange radiator associated with saidboil
humidifying Dan heating coil is effected by rea
er, a water circulating system connecting said
son of the drop in temperature of said boiler wa
ter in said service water heating coil resulting in radiator to said boiler in manner to provide ther
76 thermo-syphon action in said circulating system. mo-syphon circulation of boiler water through
said radiator, an air circulating system enclosing 75
2,129,202
said radiator and disposed in manner to provide
thermo-syphon circulation of air ..through said
radiator and into the space being heated, combus
tion control mechanism associated with said boil
er for regulating‘ the rate of fuel combustion
therein, means responsive to the temperature of
water in said boiler for continuously regulating
said combustion control mechanism in modulat
ing manner tending to maintain the temperature
10 of said boiler water substantially constant, means
responsive to the temperature of. the air in the
space being heated for changing the relation of
said water temperature responsive means and said
combustion control mechanism to cause said wa
15 ter temperature responsive means to actuate said
active operation while isolated from said heat ex—
changer and is therefore instantly available for
quickly heating the space being served upon open
ing said closing off means to admit hot water from
said boiler into said heat exchanger.
13. An air conditioning system for selectively
heating or cooling an enclosed space, comprising
a boiler for heating water, a heat exchanger ar
ranged to serve said enclosed space, means con
necting said heat exchanger to said boiler in man 10
ner to permit circulation of hot water from said
boiler by natural convection through said heat ex
changer to heat said space, manually operable
means to close o?’ said connecting means to iso
late said boiler from ‘said heat exchanger, a service 15
water heating system associated with said boiler
including a tank for storing heated service water
and a water heater disposed to be heated by said
perature upon the space temperature falling be
low a predetermined minimum than is maintained boiler and connected to supply hot water to said
storage tank, means arranged to circulate cooling 20
20 when the space temperature is above said pre
,iiuid
through said'heat exchanger while it is iso
determined minimum to increase the rate of heat
lated from said boiler by said closing off means to
ing by said boiler, a fan disposed in said air cir
cool said space being served, and means for auto
culating system in position to augment the circu
lation of air therethrough, and means actuated matically regulating said boiler in response to the
temperature of ' the water therein in manner 25
25 by said water temperature responsive means con
trolling the operation ’of said fan to cause it to ‘tending to ‘maintain the water temperature sub
operate when the temperature of said boiler water stantially constant to provide modulated regula
exceeds a predetermined maximum to increase tion thereof while said boiler is functioning to
heat said space and to provide for automatically
the circulation of air through said radiator there
30
30 by increasing the rate of delivery of heat from heating service water to a predetermined tem
perature for storage in said tank while said boiler
said radiator to the space being heated and con
sequently increasing the rate of thermo-syphon is isolated from said heat exchanger whereby said
boiler is maintained in active operation while iso
circulation of water through said radiator to in
crease the rate at which heat is conveyed from lated from said heat exchanger and istherefore
combustion control mechanism in manner tend
ing to maintain said boiler water at a higher tem
said boiler to said radiator.
’
.
12. An air conditioning system for selectively
heating or cooling an enclosed space, comprising
a boiler for heating water, a heat exchanger ar_
ranged to serve said enclosed space, means con
necting said heat exchanger to said boiler in
manner to permit circulation of hot water from
instantly available for quickly heating the space 35
being served upon opening said closing o? means
to admit hot water from said boiler into said heat
exchanger.
14. The method of operating a heat exchange
system which comprises circulating a-heat con 40
ducting medium through a boiler in circuit with
a heat exchanger and a storage water heater
during cold weather, and isolating the heat ex
changer from the boiler and storage water heater
changer, a service water heating system associ-' in warm weather and passing a cooling ?uid 45
ated with said boiler including a tank for storing through the heat exchanger, and maintaining the
said boiler through said heat exchanger to heat
.said space, means to close off said connecting
means to isolate said boiler from said heat ex
, heated service water and a water heater disposed
boiler in operation to provide heat ‘for the storage
to be heated by said boiler and connected to sup
ply hot water to said storage tank, means ar
water heater and to provide reserve heat for the
I ranged to circulate cooling ?uid through said heat
heat exchanger.
.
15.
combination, a boiler, a hot water stor 50
age tank, a cabinet, a heat exchanger in said cabi
net, a fan for forcing air through said cabinet, a
exchanger while it ‘is isolated from said boiler
by said closing o? means to cool said space being
served, and means for automatically regulating - source of cold water supply, adjustable means
said boiler in response to the temperature of the connecting said heat exchanger with said source,
water therein in manner tending to maintain the said boiler and said storage tank whereby air may 55
be heated or cooled in said cabinet while the boiler
water temperature substantially constant to pro
remains in operation, and thermostatic means for
vide modulated regulation thereof while said boil
automatically controlling said boiler for air heat
er is functioning to heat said space and to pro
vide for automatically ‘heating service water to a ing requirements, said means also controlling the
predetermined temperature for storage in said
boiler for storage water heating while the cabi
tank while said boiler is isolated from said heat
net is serving as a cooling means.
exchanger whereby said boiler is maintained in
MONTROSE K. DREWRY.
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