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Aug. 39, 1947.
A. R. THOMAS
\
2,426,069
REFRIGERATION
Filed Oct. 25. 1944
INV
NTOR
I
677
ATTORNEY
‘2
2,426,069
Patented Aug. 19, 1947
1
uulrrp s'rA'rss PATENT OFFICE '
REFRIGERATION
Albert R. Thomas, deceased, late of Evansville,
Ind., by The National City Bank, administrator,
Evansville, Ind, “assignor to Servel,>Inc., New
York, N. Y., a corporation of Delawarev
Application October 25, 1944, Serial No. 560,213
19 Claims. (Cl. 62-419,)‘,
1
The present invention relates to improvements
in absorption refrigeration systems and more
particularly to apparatus for transferring non
condensible gases from one part of the system to
another part thereof.
’
While the apparatus of the present invention
may be applied to any two-pressure absorption
refrigeration system it is particularly adapted for
2
apparent from the ' following description and
drawing. It is to be expressly understood, how
ever, that'the drawing is for the purpose of
illustration only and not a de?nition of the limits
of the invention, reference being had for this
purpose to the appended claims. In the drawing,
the single ?gure is a'diagrammatic view of an
absorption refrigeration system incorporating the
novel features of the present invention.
described in the prior patent to Thomas et al., 10" Referring to- the drawing, the invention is"
shown as applied to a two-pressure absorption
No. 2,282,503, entitled Refrigeration. The absorp
refrigerating system similar to that illustrated X
tion refrigeration system illustrated in the prior
and described in the prior Thomas et a1. patent,
patent operates in a partial vacuum and utilizes
referred to above. In a system of this type liquid
water as a refrigerant and a saline solution as
an absorbent. In such a refrigeration system 1,5 refrigerant such as, for example, water is intro
use with a system of the type illustrated and
non-condensible gases may accumulate in ‘the
duced into the upper part of an evaporator or
cooling element 10 from a condenser H through
a path of flow including a U-shaped tube l2 and
a chamber I3. The, liquid refrigerant evaporates
generation of such non-condensible gases or the
place where such gases are generated is not fully 20 in evaporator [0 with consequent absorption of
various elements of the system which must be
purged periodically. The exact cause of the
understood but the gases appear in all parts of
the system and accumulate in the condenser and
absorber. As the condenser operates at a higher
pressure than the absorber the non-condensible
heat from the ambient, such as a stream of air
flowing over the exterior surface of the tubes l6
and fins l5 of the evaporator. The refrigerant
vapor formed in evaporator l0 flows to an ab
gases may be purged more easily from the con-' 25 sorber HS in which the vapor is absorbed into a
denser than from the absorber. Furthermore,
the presence of such non-condensible gases in
the absorber decreases the emciency of the re
frigeration system to a greater degree than their
presence in the condenser.
liquid absorbent such as, for example, a solution
of lithium chloride or lithium bromide.
The absorption liquid enriched with refrigerant
is conducted from the absorber IE to a generator
30 I‘! in a path of flow including a conduit l8, liquid
heat exchanger l9, conduit 20, vessel 2|, and
One of the objects of the present invention is
to provide apparatus in an absorption refrigera
tion system for continuously withdrawing non
conduit 22. Within the generator I‘! are disposed '
condensible gases from the low pressure side of
shell forming a chamber to which steam is sup-.
plied through a conduit 24 from a suitable source
the system and transferring them to the high
pressure side of the system.
_
Another object is to provide apparatus of the
type indicated which utilizes vaporized refriger
a plurality of riser tubes 23 enclosed by an outer
of supply. The heating of the riser tubes 23 by
the steam causes refrigerant vapor to be expelled
‘from the absorbent and the‘ expelled vapor is
effective to raise the absorbent liquid by gas or
ant in a Venturi tube to evacuate non-condensible
->
gases from the absorber and transfer them to 40 vapor-lift action.
The expelled vapor passes from the upper ends
the condenser.
of the riser tubes 23 into a vapor separator 25
Another object is to provide apparatus of the
_ and thence flows through a conduit 26 to the
type indicated which operates to vaporize re
condenser II in which the vapor is lique?ed.
frigerant continuously and maintain the refriger
ant vapor at a predetermined constant pressure. 45 Liquid refrigerant formed in'condenser ll ?ows
into a sump 21 and from the sump flows into a
Another object is to provide apparatus of the
lateral branch-conduit 28 and through the
type indicated in which the pressure of the
U-shaped tube 12 to the .upper part of the evapo
refrigerant vapor is maintained constant by a
balancing column of liquid refrigerant of pre
determined height.
'
rator ID, as explained above, to complete the
50 refrigerating cycle.
'
The raised absorption liquid from which re
frigerant vapor has been expelledyis conducted
from the upper part of the generator I’! to ab
~ simple construction and efllcient in performing
sorber Hi to absorb refrigerant vapor, this liquid
its intended function.
7
These and other objects will become more 65 being conducted to the absorber in a path of ?ow
Still another object of the invention is to pro
vide apparatus of the type indicated which is of
2,426,069
4
including a conduit 29, liquid heat exchanger l9
and conduit 30. The heat liberated by absorption
of refrigerant vapor in absorber I6 is taken up by
a cooling medium such as, for example, Water
which ?ows upward through vertically disposed
banks of pipes 3| in the absorber. The cooling
water is introduced into the lower end of the
banks of pipes through a conduit 32 and'is dis
charged from the upper ends of the 'banks of
pipes through a conduit 33. The conduit 33 is
connected to condenser H so that the cooling
water also may be utilized to effect cooling of
the condenser II. The cooling water is dis
charged from condenser ll through a conduit 34.
The system operates in a partial vacuum with
generator H and condenser ll operating at one
pressure and evaporator l0 and absorber l6 oper
ating at a lower pressure.
The pressure differ.
ential between the high and low pressure sides
of the system is maintained by a liquid column
densible gases continuously from the absorber to
the condenser.
In accordance with the present. invention ap
paratus is provided for'cooperation with the re
frig‘eration system to withdraw non-condensible
gases continuously from the absorber l6 and
transfer them to the condenser II. The appa
ratus comprises a depending U-tube 40 having a
down-leg 4| and an up-leg 42 connected by a
. loop at their lower ends.
The upper end of the
down-leg 4| of the U-tube 40 is connected to the
bottom of the sump 21 at the outlet from the con
denser II. The end of the up-leg 42 of the U
tube 40 extends into an annular chamber 43 at
one end of a Venturi tube 44. The end of the
Venturi tube 44 is welded or otherwise sealed to
the sides of the up-leg of the U-tube 40 adjacent
its upper end and the Venturi tube tapers in
wardly around the end of the U- tube to provide
a Venturi throat, 45. The Venturi tube 44 be
yond the throat 45 gradually increases in dia
the condenser II and evaporator l0 and a liquid
meter and its opposite end is connected to the
column in the conduit l8 connecting the absorber
conduit 26 extending between the generator I]
l6 and the heat exchanger I9; A liquid column
and condenser I 1. Connecting the chamber 43 in
is also provided in the conduit 3!) connecting the
the Venturi tube 44 and the interior of the ab
heat, exchanger I6 and absorber 16. The liquid
sorber I6 is a conduit 46 which extends through
level in the U-shaped tube i2 is indicated by the
the side wall of the absorber with its end posi
tioned at the center and adjacent the bottom
reference character 1:; thej liquid level in the ves
thereof where the non-condensible gases accu
sel 2| connected to the ‘conduit l8 through the‘
heat exchanger i9 is indicated by the reference 80 mulate.
The lower looped end of U-tube 40 may be
character 1/; and the liquid‘ level in the conduit
heated by any suitable means to vaporize liquid
29 connected to the conduit 30 through the heat
refrigerant therein. In the embodiment of the
exchanger [9 is indicated by the reference char
acter z.
'
'
invention illustrated in the drawing the lower
During operation of the refrigeration system 85 end of the up-leg 42 of the U-tube 40 has a num
ber of helical coils 41 surrounding the base of the
non-condensible gases may accumulate in the
generator I‘! in heat conducting contact there
various elements thereof. These non-conden
sible gases are probablyjormed by the chemical
with which constitutes a ?ash boiler for contin
uously vaporizing liquid refrigerant. While the
action of the ?uids with the metallic parts of
the system. The gases in the condenser tend 40 apparatus is described as comprising separate
to accumulate adjacent the outlet sump 21 and
parts it is in effect a continuous U-tube having
may to some extent be transferred through the ‘ its opposite ends connected at opposite sides of
U-shaped tube l2 to the upper part of the evapo
the condenser. with a down-leg 4| connected to
rator I 0. Such gases in the evaporator III are
receive condensate from the condenser, an up-leg
swept into the absorber l6 by the refrigerant as
42 having a Venturi throat 45 therein, a cham
it flows into the absorber at high velocity. The
ber 43 adjacent the Venturi throat connected
gases then accumulate in a layer at the bottom
to the absorber I6 through the conduit 46 and
of the absorber l6. Thus the non-condensible
heating coils 41 at the lower end of the up-leg
gases accumulate adjacent the outlet of the con
'in heat conducting relationship with the base of
denser II and at the bottom and center of the
the generator H. The construction of the appa
absorber l6 and blanket off that portion of the
ratus having been described in detail its mode of
condenser or absorber which they cover.
v
operation isiexplained as follows.
As the condenser H operates at a higher pres
For purposes of description let it be assumed
sure than the absorber l6 the non-condensible
that no heat is being supplied to the generator
gases may be withdrawn from the condenser with
and the refrigeration system is inoperative. The
greater ease than from the absorber. For this
opposite legs 4! and 42 of the U-tube 40 will have
reason an exhaust pipe 36 is connected between
columns of liquid refrigerant therein of equal
the condenser at a point adjacent its outlet and
height. When steam is supplied to the generator
a suitable exhaust pump, not herein shown. The
I‘! through the conduit 24 the refrigerant will be
non-condensible gases are purged periodically 60 vaporized in the vertical riser tubes 23 and will
rise through the vapor separator 25 and conduit
from the condenser by the exhaust pump and
preferably a manually operable stop valve 31 is
26 to the condenser II, The refrigerant vapor
provided in the exhaust pipe 36. As the non
will be condensed in the condenser H and flow by
gravity into the sump 21 and down-leg 4| of the
condensible gases are purged from the condenser
H it is necessary to provide some means for 65 U-tube 40.
Simultaneously with the vaporization of the
transferring the gases from the absorber l6 to
refrigerant in the generator I‘! the liquid re
the condenser. Furthermore, due to the differ
ence in pressure in the condenser and absorber
frigerant in the coils 41 at the lower end of the
up-leg 42 of the U-tube 40 will be vaporized by
the same amount of the non-condensible gas will
blanket off a greater portion of the absorber than 70 heat conduction from the generator. Such va
porized refrigerant in the coils 41 will expand
of the condenser. As a result the accumulation
and move upwardly in the up-leg 42 to displace
of the gases in the absorberdecrease the em
ciency of the refrigeration system to a greater
the liquid refrigerant therein and cause it to spill
degree than when present in the condenser. It
over into the chamber 43 and flow through the
is, therefore, desirable to transfer the non-con 75 conduit 46 to the absorber l6. This action will
in the up leg of the U-shaped tube ‘Ill-between
2,426,669
V
for heating» the generator to expel refrigerant
vapor from absorption solution therein, a boiler ,
arranged to receive liquid refrigerant from one,
of the high pressure elements of the system,
means for heating the boiler to vaporize the
liquid refrigerant therein, and a device utilizing
the refrigerant vaporized in the boiler for with
8
'
.
tube, a conduit connected. to an element of the
low pressure group, and a device utilizing the
vaporized refrigerant in the U-tube for with
drawing non-condensible gases from the element
of the low pressure group through the conduit
and transferring the gases to an element of the
high pressure group.
'7. In an absorption refrigeration system of
drawing non-condensible gases from an element
the type having an absorber operable at low
of the low pressure group and transferring the
gases to an element of the high pressure group. 10 pressure and a condenser operable at a higher
pressure with means for maintaining the pressure
3. Inv an absorption refrigeration system of the
type having‘ one group of elements including an
differential between the condenser andv absorber,
the combination with said condenser and absorber
evaporator‘ and absorber operable at low pressure
and another group of elements including a gen
of a U-tube connected at itsopposite ends to
erator and condenser operable at a higher pres 15 the opposite sides of the condenser, said U-tube
being arranged to receive liquid refrigerant at
sure, means for maintaining the pressure dif
ferential between the groups of elements, means
one end and discharge refrigerant vapor from
for heating the generator to expelxrefrigerant
its opposite end, means for vaporizing the liquid
vapor from absorption solution therein, a boiler
refrigerant in the U-tube, a conduit connected
arranged to receive liquid refrigerant from one 20 to the absorber, and a device utilizing the vapor
of the high pressure elements of. the system,
ized refrigerant in the U-tube to withdraw non
means for heating the“ boiler to vaporize the '
condensible ‘gases from the absorber through the
liquid refrigerant therein, and a Venturi tube
conduit and transfer'the gases to the condenser.
utilizing the refrigerant vaporized in the boiler
-8. In an absorption refrigeration system' of
for withdrawing non-condensible gases from an 25 the type having one group of elements operable
element of the low pressure group and transfer
at low pressure and another group of elements
ring the gases to an element of the high pressure
operable at a higher ‘pressure with means for
maintaining the pressure differential between the
4. In an absorption refrigeration system of the '
groups of elements, the combination with said
type having an absorber operable at low pressure 30 system‘ of a U-tube connected at its opposite ends
and a condensereoperable at ‘a higher pressure
to elements of the high pressure group, said
with means for maintaining the pressure dif- " U-tube “being arranged to receive liquid refrig
ferentialbetween the condenser and absorber, the
erant at one end and discharge refrigerant vapor 7
combination with said condenser and absorber of ‘ .from its opposite end, means for vaporizing the
a boiler arranged to receive liquid refrigerant
liquid refrigerant in the U-tube, a conduit con- .
from the condenser, means for heating the boiler
nected to an ‘element of the low pressuregroup,
to vaporize, the liquid refrigerant therein, and a
and a Venturi tube utilizing the vaporized re
Venturi tube utilizing the refrigerant vaporized
frigerant in the U-tube to withdraw non-con
group.
'
in the boiler and connected to withdraw non-con
densible gases from the element of the low pres- '
densible gases from the absorber and transfer the 40 sure group through the conduit and, transfer
gases to the condenser.
the gases to an element of the high pressuregroup.
5. In an absorptionrefrigeration system of the
9. In an absorption refrigeration system of the
type having one group of elements operable at
type having one group of elements operable at
low pressure and another group of elements op
low pressure and another group of elements oper
45
erable at a higher pressure with means for main}
able at a higher pressure with means for maintain
taining the pressure differential between the
ing the pressure differential between the groups of
groups of elements, the combination with said
elements. the combination with said system of a
system of a boiler, a conduit arranged to supply
U-tube connected at its opposite ends to elements
liquid refrigerant from one of the‘ high pressure
of the high pressure group, said U-tube being ar
elements of the system to the boiler and maintain 50 ranged to receive liquid refrigerant at one end
a, column of liquid therein to produce a pressure
and discharge refrigerant vapor from its opposite
in the boiler higher than the pressure in the
end, means for, vaporizing the liquid refrigerant
remainder of the system, means for heating the
in the U-tube, a conduit connecting the U-tube
boiler to vaporize the liquid refrigerant therein,
a Venturi tube connected to receive vaporized 55 and an element of the low pressure group, and a
Venturi throat in. the U-tube utilizing the vapor
refrigerant from the boiler, and conduits con
ized refrigerant therein to Withdraw non-eon
necting the Venturi and elements of the high
densible gases from the element of the low pres
and low pressure groups, said Venturi tube utiliz
sure group through the conduit and transfer the
ing the vaporized refrigerant for withdrawing
to an element of the high pressure group.
non-condensible gases from the low pressure 60 gases
10.
In an absorption refrigeration system of
group through one of the conduits and transfer
the type having an absorber operable at low pres
ring the gases to an element of the high pressure
sure and a condenser operable at a higher pres
group through the other conduit.
sure with means for maintaining the pressure
6. In an absorption refrigeration system of the
type having‘one. group of elements operable at 65 differential between the condenser and absorber,
the combination with said condenser and absorber
low pressure and another group of elements op
of a U-tube connected at its opposite ends to the
erable at a higher pressure with means for main
opposite sides of the condenser, said U-tube being
taining the pressure differential between the
arranged to receive liquid refrigerant from the
groups of elements, the combination with said sys—
tem of a depending U-tube connected at its op 70 condenser at one end and discharge refrigerant
vapor to the condenser at its opposite end, a Ven
posite ends to elements of the high pressure
group, said U-tube being arranged to receive“ turi throat in the U-tube, and a conduit connect
ing the Venturi throat and absorber, said venturi
liquid refrigerant at one end and discharge re
utilizing the vaporized refrigerant in the U-tube
frigerant vapor from its opposite end,’ means
for vaporizing the liquid refrigerant in the U
75 to withdraw non-condensible gases from the ab
2,426,069
5
6
continue until the liquid refrigerant in the uD-leg
42 has been completely displaced by the vaporized
refrigerant. The column of liquid refrigerant in
ditions of the particular absorption refrigeration
system to which the present invention is shown
the down-leg 4| of the U-tube 40 will tend to ?ow
into the coils 47 to be vaporized therein. The
pressure normally occurring in the condenser | |
feeding of the liquid refrigerant to the coils 41,
however, will be opposed by the pressure of the
vaporized refrigerant in the up-leg 42. Thus the
applied is described as follows.
The absolute
is one pound per square inch (lat/sq. in.) while
the absolute pressure occurring in the absorber
H3 is one-tenth of a pound per square inch
(.1#/sq. in.). It has been found that by main
taining a refrigerant vapor pressure in the up
pressure of the vaporized refrigerant in the up
leg 42 is balanced and maintained by the column 10 leg 42 of the U-tube 40 of four pounds per square
of liquid refrigerant in the down-leg 4|. As the
refrigeration system continues to operate more
inch (4#/sq. in.) absolute a sufficiently high
vacuum may be maintained in the chamber 43 to
continuously withdraw non-condensible gases
condensate from the condenser will be fed to the
sump 21 which increases the height of the liquid
from the absorber 16.‘ In order to maintain a
column in the down-leg 4| until its level is raised 15 pressure of the refrigerant vapor of four pounds
to the level of the lateral branch-conduit 28
per square inch absolute a liquid column six feet
high must be maintained in the down-leg 4| of
where it over-flows into the U-tube |2 connected
to the evaporator It). It will be observed, there?
the U-tube. This liquid column is maintained in
the down-leg 4| by arranging the lateral branch
fore, that the lateral branch conduit 28 will main
tain a column of liquid in the down-leg 4| of the 20 conduit 28 a distance of six'feet above the bottom
U-tube 40 of a predetermined height as indi
of the U-tube 40. The six foot head of liquid
refrigerant in the down-leg 4| corresponds to a
cated by the reference character h. With a col
umn of liquid in the down-leg 4| of a predeter
pressure of three pounds per square inch (3#/sq.
mined height the vaporized refrigerant in the
in.) which in addition to the one pound per
up-leg 42 will be maintained at a pressure corre 25 square inch occurring in the condenser || gives
sponding to the height of the liquid column.
a total pressure of the refrigerant vapor of four
The vaporized refrigerant in the up-leg 42 of
pounds per square inch absolute.
the U-tube 40 will escape from its open end under
It will now be observed that the present in
pressure and pass through the Venturi throat 45.
vention provides an apparatus for continuously
The ?ow of refrigerant vapor through the Ven 30 transferring non-condensible gases from the low
turi throat 45 entrains the media in the chamber
pressure side of the system to the high pressure
43 to evacuate the latter, the vaporized refriger
side of the system. It will further be observed
ant and entrained media flowing through the
that the invention utilizes vaporized refrigerant
at apredetermined constant pressure in a Ven
Venturi tube 44 to the conduit 26 and into the
condenser | |. The evacuation of the chamber 43
turi tube to withdraw'the non-condensible gases
will continue until the pressure therein is less
from the low pressure absorber and transfer them
than the pressure in the absorber Hi, When the
to the high pressure condenser. It will still fur
pressure in the chamber 43 is less than the pres
ther be observed that the present invention pro
sure in the absorber IS the non-condensible gases
vides a novel construction of apparatus for main
adjacent the end of the conduit 46 will be drawn 40 taining a column of liquid refrigerant of a prede
therethrough and into the chamber and pass
termined height to balance the vaporized re
through the Venturi tube 44 to the conduit 26 and
frigerant to maintain the latter at a predeter
into the condenser ||. During normal operation
mined constant pressure.
of the refrigeration system the liquid refrigerant
While a preferred embodiment of the invention
will be continuously vaporized in the heating coils 45 is herein shown and described as applied to a par
v41 at the lower end of the up-leg 42 of the U-tube
ticular absorption refrigeration system, it will be
40 and the vaporized refrigerant will be forced
apparent to those skilled in the art that the in
under pressure through the Venturi tube 44 to
vention may be applied to other systems and that
withdraw non-condensible gases from the ab
various modi?cations and changes may be made
sorber l6 continuously and transfer the gases to 50 in the construction and arrangement of the parts
the condenser | I. Periodically the non-condensi
thereof without departing from the spirit or scope
ble gases will be purged from the condenser | | by
of the invention.
means of the vacuum pump (not shown) which
What is claimed is:
operates to evacuate the exhaust pipe 38 con
1. In an absorption refrigeration system of the
nected to the condenser || until the pressure in 55 type which operates in a partial vacuum and
the latter is lower than the pressure in the con
utilizes water as a refrigerant and salt solution
denser. The stop valve 31 in the exhaust pipe
as an absorbent and in which non-condensible
36 then will be opened to connect the interior of
gases may occur, said system having one group
the condenser H to the vacuum pump to with
of elements operable at low pressure and another
draw the non-condensible gases. At the comple 60 ‘group of elements operable at a higher pressure,
tion of a purging operation the stop valve 31 is
means including liquid columns for maintaining
closed.
I
the pressure differential between the groups of
It will be understood that the U-tube 40 will
elements, and apparatus utilizing a portion of the
be so constructed and arranged as to adapt it for
the conditions of the particular refrigeration sys
tem to which it is applied. For instance, the di
ameter of the up-leg 42 of the U-tube '40 must be
so limited as to maintain the pressure of the
refrigerant
for
transferring
non-condensible
65 gases from an element of the low pressure group
to an element of the high pressure group in said
system, said apparatus being connected to re
ceive refrigerant from and return the refrigerant
vaporized refrigerant while providing a suflicient
to said system.
'
2. In an absorption refrigeration system of the
volume of vapor discharged from its end to cre 70
ate the desired vacuum in the chamber 43., It _type having one group of elements operable
also will be understood by those skilled in the art
at low pressure and another group of elements
including ‘a generator operable at a higher pres
that a nozzle may be provided at the upper end
of the up-leg 42 if such a nozzle is found neces
sary. A speci?c example of the' operating con
sure, means for maintaining the pressure dif
75 ferential between the groups of elements, means
v ‘9,496,069
sorter through the conduit and transferathe'gases
‘ to the condenser.
porized refrigerant in the U-tube for wlthdraw- ,
ing non-condensible gases from the element of
;
11. In an absorption refrigerationsystem Of the ’ the‘ low pressure group through the conduit and
type having one group of elements (operable at ' ' transferring the gases to an element or the high
low, pressure and another group of elements op
‘pressure
taining the pressure differential between ‘the
groups of elements, a U-tube connected at its op
posite ends to elements of the high pressure group,
one leg of said *U-tube being arranged to receive
liquid refrigerant continuously to maintain a col
umn of liquid therein, means for vaporizing the
group. '
"
'
15. In an absorption refrigeration system of
the type having one group ‘of elements operable
at low pressure and another group .of elements
, erable at a higherpressure with means for main
‘operable at a higher pressure‘ with means for
10 maintaining the pressure differential between the
groups of e1ements,~'a U-tube' connected ,at its
‘ opposite ends to elements of the high pressure
~ group, said U-tube being arranged to receive
liquid refrigerant at the lower end of the U-tube
liquid refrigerant continuously at one end to
to maintain vapor in the other leg, of the U-tube
at a pressure corresponding to the height of the 15 maintain a column ‘of liquid ‘of predetermined
height in one leg thereof, means for vaporizing
liquid column in the ?rst leg, and a device utilizé
ing the vaporized refrigerant in the U-tube for - the liquid refrigerant at the lower end of the U
transferring non-condensible ‘gases from an ele
tube to 'm'aintain‘vapor in the other leg at a
pressure corresponding to the height ‘of the liq
ment of the low pressure group to an element of
the high pressure group.
‘
.
12. In an absorption refrigeration system 0 v
to
the type having one group of elements operable
at low pressure and another group of elements
uid column in ‘the ?rst leg, a ‘Venturi throat in
the second leg of the U-tube, and a conduit con
necting an element of the low pressure group‘ to
the Venturi throat, said vapor in the leg of the
operable at a higher pressure with means for .
U-tube passing through'the Venturi throat to
maintaining the pressure differential between the 25
withdraw non-condensible gases from the ele- . I
groups of elements, a U-tube connected at its opi
ment of the low pressure ‘group ‘and transfer the ,
gases to an element of the high pressure group.
posite ends to elements of the high pressure
16; In an absorption refrigeration system of
group, said U-tube being arranged to receive liquid
the type having an absorber operable at low
refrigerant at one end, a branch conduit adjacent
the upper end of the U-tube for receiving liquid 30 pressure and acondenser operable at a higher
refrigerant, said branch conduit maintaining a‘ - pressure ‘with means for maintaining the pres
liquid column in one leg of ‘the U-tube of .a pre
sure differential between the groups of elements,
determined constant height, means for vaporizing
a U-tube connected at its opposite ends to the
the liquid refrigerant at the lower end of the U
opposite sides of the condenser, said U-tube be
tube to ‘maintain vapor in the other leg of the U~ 35 ing arranged to receive liquid refrigerant con
tube at a pressure corresponding to the height of
tinuously from the condenser at one end to main
tain a column of liquid of predetermined height
the liquid column in the ?rst leg, and a device uti
lizing the vaporized refrigerant in the U-tube for
in one leg thereof, means for vaporizing the liq
transferring non-condensible gases from an ele
uid refrigerant at the lower end of the U-tube
ment of the low pressure group to an element of 40 to maintain vapor in the other leg of the U-tube
at a pressure corresponding to the height of
the high pressure group.
the liquid column in the ?rst leg, a Venturi throat
13. In an absorption refrigeration system of
in the second leg of the U-tube, and a conduit
the type having an absorber operable at low pres
"connecting the absorber and Venturi throat, said
sure and a condenser operable at a higher pres
sure with means for maintaining the pressure 45 vaporized refrigerant in the U-tube passing
through the Venturi throat to withdraw non
differential between the condenser and absorber,
condensible gases from the absorber through the
a U-tube connected at its opposite ends to the op
conduit and transfer the gases to the condenser.
posite sides of the condenser, said U-tube being
17. In an absorption refrigeration system of
arranged to receive liquid refrigerant continuous
1y at one end to maintain a column of liquid of 50 the time having an evaporator and absorber op
erable at low pressure and a generator and con~
predetermined height in one leg thereof, means
denser operable at a higher pressure with means
for vaporizing the liquid refrigerant at the lower
for maintaining the pressure differential there
end of the U-tube to maintain vapor in the other
between, a U-tube connected at its opposite ends
leg thereof at a, pressure corresponding to the
height of the liquid column in the ?rst leg, and 55 to the opposite side of the condenser, said U-tube
being arranged to receive liquid refrigerant con
a device utilizing the vaporized refrigerant in the
tinuously at one end, a branch conduit adjacent
U-tube for transferring nomcondensible gases
the upper end of the U-tube for receiving liq- '
from the absorber to the condenser.
uid refrigerant and delivering it to the evapo
14. In an absorption refrigeration system of
the type having one group of elements operable 60 rator. said branch conduit maintaining a liquid
column in the leg ofthe U-tube of a predeter
at low. pressure and another group of elements
mined height, the lower end of the U-tube hav
operable at a higher pressure with means for
ing coils surrounding the base of the generator
maintaining the pressure differential between the
to vaporize the liquid refrigerant therein to
groups of elements, a U-tube connected at its
opposite ends to elements of the high pressure 65 maintain vapor in the other leg of the U-tube
at a ‘pressure corresponding to the height of the
group, said U-tube being arranged to receive liq
liquid column in the ?rst leg, and a device uti
uid refrigerant continuously at one end to main
lizing the vaporized refrigerant in the U-tube
tain a column of liquid of predetermined height
for transferring non-condensible gases from the
in one leg thereof, means for vaporizing the liq
’
uid refrigerant at the lower end of the U-tube to 70 absorber to the condenser.
18. In an absorption refrigeration system‘ of
maintain vapor in the other leg thereof at a, pres
the type having an evaporator and absorber 0D
sure corresponding to the height of the liquid col
umn in the ?rst leg, a conduit connected to an
element of the low pressure group, a Venturi tube
connected to the conduit and utilizing the va
erable at low pressure and a generator and con
denser operable at a higher pressure, conduits
75 connecting the condenser and evaporator and the
2,426,089
.
absorber and generator and arranged to main
tain liquid columns therein to balance the dif
ferential in pressure, a U-tube connected at its
opposite ends to the opposite side of thecon
denser, said U-tube being arranged to receive liq
uid refrigerant continuously at oneend from
the condenser, the conduit between the con- 7
denser and evaporator being connected to the U
tube adjacent its upper end to maintain a liquid,
column'in one leg thereof of a predetermined
' height, means for vaporizing the liquid refriger
ant in the lower end of the .U-tube to maintain
vapor in the other leg of the U-tube at a pres
'
12
rator and absorber, a U-tube connected at its
opposite ends to opposite sides of the condenser,
said U-tube receiving'iiquid refrigerant at." one
end'from the condenser to maintain a liquid‘col
umn therein, means for vaporizing the liquid re
frigerant at the lower end of the U-tube to pro
duce- refrigerant vapor in the other leg thereof
at a pressure corresponding to the height of the
liquid column in the ?rst leg, a Venturi throat
in the second leg of the U-tube, and a conduit
connecting the absorber and Venturl throat
whereby the vaporized refrigerant passing
through the venturi operates to withdraw non
sure corresponding to the height of the liquid
condensible gases from the absorber and trans
column in the ?rst leg, a Venturi throat in the 15 fer the gases to the condenser.
second leg of the U-tube, and a conduit con?
THE NATIONAL CITY BANK,
necting the absorber and Venturi throat where
Administrator of the Estate of Albert R_ Thomas,
by ~vaporized refrigerant passing through the
Deceased,
, Venturi throat voperates to withdraw non-con
densible gases from the absorber and transfer 20.
them to the generator. -
g
.
By JOHN N. EMIG,
Vice President.
19; In an absorption refrigeration system of
the type utilizing water as a refrigerant and a
REFERENCES CITED
The following references are of record in the
saline solution as an absorbent and operable in
a partial vacuum, a generator, a condenser, an 25 file of this patent:
evaporator, an absorber, conduits connecting
UNITED STATES PATENTS
the generator, ‘condenser, evaporator, and ab
sorber to provide a closed circuit and arranged
Number
‘Name
Date
to provide pressure balancing liquid columns be
258,227
Gergens __________ __ May 23, 1882
, tween the generator and condenser and evapo
30
2,374,521
Anderson, Jr_______ __ Apr. 24, 1945
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