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Патент USA US2007291

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July 9, 1935.
- 2,007,291
Original Filed Jan. 51, 1934 4
2 Sheets-Sheet l
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July 9, 1935.
Original Filed Jan. 31, 1934
2 Sheets-Sheet 2
Jamaal 77a azzdersozz
Patented July 9, 1935 ‘
Samuel M. Anderson, Sharon, Mass., assignor to
RF. Sturtevant Company, Inc., Boston, Mass.
Original application January 31, 1934, Serial No.
709,118. ' Divided and this application January
12, 1935, Serial No. 1,524
pr items»
w ..1
2 Claims. (Cl. 62-117)
This invention relates to the conditioning of provided‘ in the path of mixed outside and re
air for passenger vehicles, and relates more par circulated air, the warmest ice water being fed
ticularly to the conditioning of air circulated through the pre-cooling coils which extract all
through railway cars.
of the heat possible from the air being condi
This application is a division of my co-pending tioned.
An object of the invention is to provide pre
application, Serial No. 709,118, ?led January 31,
cooling coils in an ice cooling system in the path
It is now becoming well known that human of the mixed recirculated and outside air to be
comfort requires that the air within an enclosure conditioned.
should be not only circulated to provide su?icient gOther objects of the invention will- be apparent 10
ventilation, but should in winter be warmed, with from the following description taken with the
moisture added to maintain the proper relative . drawings.
humidity, and in summer should be cooled, and
The invention will now be described with ref
erence to the drawings, of which:
moisture extracted from it to overcome the ex
Fig. 1 is a side view of a railway car equipped 15
cessive humidity which is usually present.
While vthe conditioning ‘of air for motion pic
ture theaters, hotel, office and industrial build
according to the present invention;
Fig. 2 is a plan view, with top removed, of the
ings has been developed to a high degree in re car and apparatus of Fig. 1;
Fig. 3 is a view looking into the car of Figs. 1
cent years, the air conditioning of vehicles, and
20 particularly railway cars, has been more or less and 2 from one end, with end removed;
Fig. 4 is a diagrammatic view showing an ice
neglected, due, perhaps, to the peculiar prob
lems involved and the many di?iculties present. cooling system for cooling the air;
Fig. 5 is a sectional plan view showing the appa
Among the di?iculties which present themselves
are the lack of space'in a railway car, which al ratus in an air conditioning chamber of this
25 ready of necessity has had to accommodate the invention, and
maximum of equipment in the minimum of space,
Fig. 6 is a side sectional view of the compart
,Y the excessive refrigeration equipment “which ment shown by Fig. 5.
The air conditioning compartment shown by
would have to be carried it the ordinary method
of conditioning buildings were followed, the Fig. 6 comprises an insulating casing III which
30 changing temperature conditions through which extends completely around the sides of the com 30
a railway car must pass, the cost of the equip partment. The compartment contains the ex
ment, and other di?iculties.
According to a feature of this invention, an air
conditioning system in which the conditioned air
is distributed without ducts, is provided. The air
conditioning chamber is mounted in the center
of the car, or other space being served, and the
conditioned air is discharged towards each end of
the car from the center. The air is discharged
40 from the chamber in two loop circuits, overhead
the passenger space. The air passes down along
one side of the car and overhead the passenger
space and is returned to the chamber down along
the other side of the car and overhead the pas
45 senger space from each of the two sides of the
chamber, the chamber thus serving to supply air
withoutlducts from a central location to the two
Outside and recirculated air’
is drawn into the chamber, ?ltered, temperature
halves of the car.
50 conditioned, and discharged.
In summer, the
air is cooled and dehumidi?ed, and, in winter, the
air is heated and humidi?ed.
tended surface main cooling coils II, the pre
cooling ‘coils I2, the steam heating coils I3, the
steam humidi?ers I4, the fans I5, which are
driven by motor I6 through the intermediary of . 35
the belt I1, the outside air inlets I8, the ?lters I8
mounted within the inlets IE on the inside of the
compartment, the recirculated air inlets 20, and
the discharge outlets 2|.
The cooling compartment is thus seen to have 40
two recirculated air inlets and two discharge but
lets. The compartment is divided into two units
by the partition 22 so that the air drawn in by
one of the fans I 5 enters through one of the out
side air inlets I8, one of the recirculated air 45
inlets 20, passes ?rst over one of the pre-cooiing
coils I2, then over half of the cooling coils II,
then over the steam coil I3, and out one of the
discharge outlets 2 I. It is seen thattwo complete
units, each serving half of the car with condi 50
tioned air, are provided in a single compact and
e?icient compartment requiring a minimum of
apparatus due to the fact that much of the
According to another feature of the invention,
the compartment is supplied with cold water from apparatus is common to the two units.
55 the ice cooling system and pre-cooling‘coils are
The air is discharged, as shown by Figs. 1 and 2, 55
overhead the passenger space and down along one
side of the car, and is returned overhead the pas
senger space and down along the other side of
the car. It has been found that this arrangement
pre-cooler used to cool the small volume of out
side air requires more surface in ‘a smaller area
with higher resistance than where the pre-cooler
is mounted in the path of the mixed air, where,
5 is particularly suitable for the supply of cold and due to the larger volume, less surface is required.
dehumidified air in hot weather. In order to Also, from the design engineering standpoint, it is
dehumidify the air su?iciently, it is usually neces preferable that all of the heat exchange surfaces
sary to cool it to a very low dew point, at which be arranged within the main cooling compart
the temperature of the cold air is too low for com
ment where more space is available.
Whereas the invention has been described in 10
highly cooled air does not enter directly the area connection with the conditioning of air supplied
occupied by passengers. Air is circulated com to passengers within a railway car, it should be
fort. But, with the present arrangement, this
pletely above the passenger space, and, by the
action of gravity, the cold air gradually diffuses
.15 down from the level at which it is discharged
from the cooling compartment, and, before enter
ing the area occupied by passengers, contacts
understood that the invention is also applicable
to any other enclosure to which it is desired to
supply conditioned air.
Whereas one embodiment of the invention has
been described for the purpose of illustration, it
should be understood that the invention is not
limited to the details described, since mam! modi
?cations may be made by those skilled in the art
without departing from the spirit of the invention.
What is claimed is:
1. Air conditioning apparatus for a passenger
vehicle, comprising a conditioning compartment
intimately with the warm air above the passenger
space and so has ‘su?lcient superheat added to it
20 by the time the conditioned air reaches the pas
sengers it has a temperature which is not too
cold for comfort.
An ice cooling system such as that illustrated
by Fig. 4 may be used for cooling the car. In
25 this case, ice water is circulated through the
located in the roof zone of the vehicle, means for 25
cooling coils H by the pump 25a, the returned drawing in fresh and recirculated air and passing
water being sprayed through the spray nozzles 26 it through said compartment, air cooling means
on the ice surface so as to remove, by the melting in said compartment, an ice chamber for provid
;of the ice, the heat units in the water. In order ing cold water through the melting of ice, means
)to prevent the excess water caused by the melt for circulating the cold water to said cooling coil 30
ing of the ice from being discharged to the tracks and returning a portion of same to said chamber,
at too low a temperature, a portion of the rela— a pre-cooling coil mounted in said compartment
tively warm water leaving the cooling coils II ‘is in the path of the mixed outside and recirculated
passed at the junction point 28 (Fig. 5) through air, and means for continuously passing the re
35 the two pre~cooling coils I2, one of which ‘is
maining portion of the cooling water leaving said 35
mounted in each of the two air conditioning units cooling coil through said pre-cooling coil and then
included within the cooling compartment ll. discharging it from said vehicle.
. The amount of water passing through the pre
2. Air conditioning apparatus for a passenger
cooling coils I2 is preferably equal to that which vehicle, comprising a conditioning compartment
40 would ordinarily be excess water, caused by the
located substantially in the center of the vehicle 40
‘melting of the ice, and ordinarily drained to the and in the root zone thereof, completely above the
This water serves to additionally cool the useful passenger space, a cooling coil in said com
air and then is discharged from the cooling coils partment, means for drawing air in fresh and
l2, through the pipe 30a, to the compartment 21, recirculated air and passing it over said coil, an
45 from which it is drained to the tracks.
ice chamber for cooling water through the melting 45
It has been the practice in the past to mount
pre-cooling coils, such as coils If, in the outside
air inlets. The advantages of mounting coils in
the path of the mixed outside and recirculated
of ice, means for circulating the cold water
‘through said coil and for returning a portion'of
same to said chamber, a pre-cooling coil, and
means for continuously passing the other portion
60 . air are that less power is required to move the air
of the water leaving said cooling coil and then
over the coils to obtain the same heat transfer. discharging it from said vehicle through said pre
Usually the larger part of the conditioned air is cooling coil.
recirculated air, while a minor portion'is outside
air. To obtain su?icient heat transfer from a
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