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Патент USA US2120883

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June 14, 1938.
K. P. BRACE ET AL
"
2,120,883
AIR CONDI TI-ONING S‘YSTEM
'- Filed Jan. 21, 1935'
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Z’ KemperPBrace
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June 14', 1938.
K. P. BRACE ET AL
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2,120,883 ‘
AIR CONDITIONING SYSTEM
Filed Jan. 21, 1935
3 Sheets-Sheet 3
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2,120,883
. Patented June‘ 14, 1938
UNITED STATES PATENT orrics
AIR CONDITIONING SYSTEM
Kempcr P. Brace and Rohert‘B. P. Crawford,
Washington, D. C. >
Application January 21, 1935, Serial No. 2,826
‘
8 Claims.
This invention deals with the art of air con
ditioning. Its primary object is to provide a
simple, inexpensive and emcient method of main
taining positive individual temperature and hu
midity regulation in the various rooms of build
ings such as hotels, apartment buildings. and
o?ice buildings wherein the rooms on each floor
open into or are located adjacent a common corri
dor or passageway.
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Heretofore attempts have been made to effect
the above results in several different ways, one
of these being to run individual conditioned air
supply and returnducts to each room, the out
‘lets of which ducts are thermostatically adjust
,15 able to supply the‘ proper amount of air .to
maintain the desired condition in each room. In
. addition to its high installation cost, this system
has the disadvantage of instability of regulation
because the operation of each thermostatically
20 controlled damper has a'pronounced effect upon
the air ?ow from every other dampered outlet.
Furthermore the opening of windows in any one
room interferes with the adjustment of the entire
system.
(01. 98-33)
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Figure 1 is a view in elevation with parts in
section showing my invention,
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_ Figure 2 is a section on line 2--2 of Figure 1. -
Figure 3 is a section substantially on line 3—-3
of Figure 2,
.
» ' Figure 4 is an enlarged detail showing control
of air circulating fan, and
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Figure 5 is a detail showing control of air from
the ducts to corridors.
In the drawings numeral Ill indicates the out 10
side walls of a building which may be’ divided by
partitions ll into rooms l2 and corridors H3. The
corridors are connected by means of doors It with
the rooms. Numerals I5~ and I6 indicate con
ventional elevators and stairways' which may
open into the corridors l3. Air supply shafts I1
and air return shafts 18 extend from‘ the base-_
ment of the building to the topmost corridor.
In each corridor and nearthe ceiling are posi 20
tioned air supply ducts l9 to conduct the air
from the shafts l1 into the corridors at a rela
tively high velocity and in such a. manner that
thorough mixing of the supplied air and the
air already in the corridor is accomplished almost ‘
25
To :obviate the above disadvantages, systems , instantaneously. Airsupplied to the shafts I1
is drawn through an air treating unit 20 by a
, have been designed which provide for an indi
vidual, automatically controlled conditioning unit fan 2 I. This treating unit may be a humidifying
_
25
in each room; There are many modi?cations - and heating system for winter use and a dehu
midifying and cooling unit in summer.
'
of this so called unit system; - In some‘ cases all
, For cooling and dehumidifying the air, the unit
30 the functions of cooling, heating, humidifying,
dehumidifying, ?ltering and circulation of airv 20 may be any suitable mechanical refrigerator
are performed within the individual units. In to cool and dehumidify akrelativelysmall quantity
other instances, the units are used merely to heat of air and supply the same tothe corridors at a
30
_ relatively low temperature through the high‘,
‘ or cool andcirculate the air, the remaining func- .
35
35 tions'being accomplished‘ by a central system velocity ducts l9 to effect rapid mixing. The
'
cooling
in
the
unit
20
may
be
effected
by
cold
which supplies a relatively small amount of air
‘water sprays, by direct expansion or by cold water
having the proper moisture content to the corri
dors of each room, this air being allowed to diffuse passing through radiators having ?nned coils.'_
into the individual rooms for proper humidity
’ 40 control.
‘Although the operation of the unit type of sys
Instead of cooling a small quantity'ofdair to a.
low temperature the mechanicalrefrigerator may
be arranged to cool and dehumidify a relatively
tem is‘not entirely unsatisfactory, the installa- _ .large amount of air and supply it to the corri
tion cost is extremely high due to the high cost of
units, electric wiring, water, refrigerant and drain
I
4_5 Piping, pipe covering, etc.
The proposed new system forming the subject
matter of this] application provides the advan
tageous operating characteristics of the unit sys
tem at an extremely low ?rst cost.
'
50 w Further objects and advantages will become
apparent from the description which follows. _
Referring to the accompanying drawings’ which
dors at. a relatively high temperature ‘at low
velocity. This system requires an interchange of
heat between the hot air entering the‘ central 45
cooling system 20 and the cold air leaving. the
system for ‘raising the temperature of the enter
ing air. The cooling in'this' case may also be byv
cold water sprays, by direct expansion or by cold
“ 50
water circulating through ?nned coils.
Refrigeration vin the unit 20 may also be by
adiabatic chemical dehumidi?cation followed by
.are made a part hereof and on which the same ‘ recooli'ng with suitable cooling means, such, "for
vreference characters are used to describe the. example, as artesian well water or mechanical 55
u . same parts throughout.
refrigeration;
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2,120,883
Isothermal dehumidi?cation may be used in
which the dehydrating medium is cooled by suit
able means such as artesian well water, by me
chanical refrigeration or inany other suitable way.
Dampers 22 controlled by motors 30 regulate
the amount of air delivered to the corridors.
These motors are controlled by thermostats 23 in
the corridors. By means of these thermostati
_ cally controlled dampers it is possible to maintain
the corridors at any predetermined temperature
under varying load conditions. For economy of
operation air is returned through openings 24
conditioning system, an air shaft having a re
stricted opening into the corridor for supplying '
air at high velocity from said system to said cor
ridor, means responsive to air conditions in said
corridor for controlling the volume of air sup
plied to said corridor, means for supplying air
from said corridor to said rooms and means re
sponsive to air conditions in said rooms for con
trolling the supplying of air to said rooms.
3. In a building having a plurality of rooms v10
and corridors, air passages connecting said rooms
with said corridors, means- in said passages for
from the corridors to-the return air shafts l8
forcibly supplying air from said corridors to said
through which it returns to the conditioning sys
rooms, individual heat responsive means in each
15 tem 20.
‘
. Located in openings 25 in the partitions ll be- ‘ of said rooms for controlling the volume of air 15
tween the rooms I! and the corridors i 3 are fan " supplied to each room, an air shaft means for
units 26. The purpose of these fans of course is conditioning and supplying conditioned air to
to draw air fromthe corridors and supply it to said air shaft, said air shaft being connected thru
restricted-openings with said corridors thru which
the rooms as needed to maintain the rooms at the
'
air
is supplied at high velocity from said shaft to 20
proper temperature condition. The fans are on
corridors and heat responsive means for
erated by motors 3| controlled by thermostats 21 said
controlling the volume of conditioned air supplied
located in the rooms into which the fans are de
from said shaft to said corridors.
livering the air. The doors of the rooms are pro
4. In a building having a plurality of rooms- on
25 vided with grills 28 or other openings near the
each ?oor and a common corridor on each ?oor 25
floor to allow the air to return to the corridors. having
passages connectingit with each room
The operation of the system is as follows:
All of the corridors are maintained at a con
stant humidity and temperature condition. This
30 may be at a higher or lower temperature than
that desired in the rooms depending on-whether
the roomsare to be heated or cooled. During
the summer months when the building is to be
cooled, the corridors are maintained automati
35 callyat a temperature about ?ve degrees cooler
_ than the temperature desired in the rooms.
In
’ said passages including an air supplying and an
air return passage, means in said air supplying
passage for forcibly delivering air at a constant '
rate to ‘said room heat responsive means in each
of said rooms for controlling said air supplying
so
means and means responsive to air conditions in
said corridors for supplying air at high velocity
to said corridors for maintaining the air therein
at a constant temperature and humidity condi
35.
tion.
’
summer it will be desirable to keep the tempera
5. In a building having a plurality of rooms
ture in the rooms about 85°F. The temperature
a corridor common to said rooms, a grill
in the corridors will be kept at about 80° F., the ‘and
40 thermostats 21 and 23 being set to keep the adjacent the top of each room and opening into
rooms and the corridors at the respective desired the corridor for supplying air from the corridor 40
temperatures. If the temperature in the rooms to the room, an opening adjacent the bottom of
rises above a predetermined degree the fans are each room for returning air from the room to the
set in operation. Since each fan unit is equipped corridor, fans in said upper openings for forcibly
45 with its own controlling thermostat different supplying air from said corridors 'to'said rooms,
temperatures may be maintained in the different heat responsive means in said rooms in control of 45
fans, a central air conditioning system, an
rooms, by a simple setting of the thermostat. said
Since each fan runs at a constant speed it‘will air duct for supplying air from said system to
deliver a. constant volume of air. Upon opening said corridors, a plurality of dampers for con
trolling the volume of conditioned air delivered
a window in any room, there will be no inter
from said duct to said corridors, heat responsive 50
ference with other rooms and no material dis
means in said corridors vfor controlling said
turbance with air conditions in the corridors.
dampers, a duct for returning air from said
During the winter months the corridors will corridors
to said system.
be maintained at about 84° to maintain a tem
6. The method of cooling a building having a ‘
55 perature of about 75° F’. in the rooms.
It will be obvious to those skilled in the art ‘plurality of corridors and a plurality of rooms 55
to which this invention pertains that various communicating with each corridor which com
prises agitating the air in each corridor and
maintaining it at a predetermined temperature
do not limit ourselves to the speci?c showing and lower than that desired in the rooms, forcibly
description but only to the invention as set forth delivering air from said corridors to said rooms 50
‘and controlling the volume of air so delivered in
in the claims.
_
response to the dry bulb temperature in said
What we claim therefore is:
_
changes may be made in the invention without
departing from the spirit thereof, we therefore
1. In a building having a corridor and a~-plu-,
05 rality of rooms opening into said corridor, an
air shaft, an air conditioning system for supply
, ing air having a predetermined temperature and
humidity to said shaft, thermostatically. con
trolled means for supplying air at high velocity
70 to said corridor from said shaft, separate means
rooms.
.
.
'7. An ‘air conditioning system for a building
having a plurality of rooms at diiferent'levels 85
a corridor connecting all of the rooms on one
level an air conditioning unit having means for
maintaining air at a predetermined temperature
and humidity, vertical air shafts for conducting
air to and from said air conditioning unit and 70
said corridor, restricted-openings from one of said
in control of each of said air supplying means. ' shafts for conducting conditioned air at a rela
2. In a building having a. plurality of rooms tively high velocity from said shaft into said
and a corridor connected with said rooms, an air corridors to mix the incoming air with that in
the corridors, and a plurality of rooms havingv 75
for supplying air from said corridor to said rooms
and heat responsive means in each of said rooms
assumes
‘openings for admitting air from said corridors
restricted opening from said air supplying shaft
into the rooms.
to said corridor for adding velocity to the air as
it‘ enters the said corridor to agitate the air
corridor having openings for supplying condi
therein and thereby mix the incoming air with
8. An air conditioning system comprising a
tioned air to and for withdrawing air from rooms
to be conditioned, an air supplying shaft and
an air return shaft for supplying air to and for
withdrawing air from said corridor, an air con
ditioning unit thru which air is caused to pass
10 from the return to the air supplying shaft, a
the air already in. the corridor and thermostatic
means responsive to the temperature in the cor
ridor for controlling the said restriction.
i
KEMPER P. BRACE.
ROBERT E. P. CRAWFORD.
W
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