FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
86
THE PATENTS RULES, 2006
COMPLETE
Specification
(See Section 10 and Rule 13) AIR-COOLED VAPOR ABSORPTION SYSTEM
THERMAX LIMITED
an Indian Company
of D-13, MIDC Industrial Area,
R.D. Aga Road, Chinchwad,
Pune-411019,
Maharashtra, India.
INVENTORS : l.DUBALVILASRAO
2. NAVALE DEVADATTA
3. DESAI RAGHAVENDRA
4. KULKARNI SAMEER
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

This application is a Divisional Application of the Indian Patent Application No. IN3048/MUM/2012 filed on October 18th, 2012, the entire contents of which are specifically incorporated herein by reference.
FIELD OF DISCLOSURE
The present disclosure relates to a vapor absorption system. More particularly, the present disclosure relates to an air cooled vapor absorption system.
BACKGROUND
An absorption refrigeration system uses water as a coolant and lithium bromide (Li-Br) solution as an absorbent. Conventional absorption refrigeration system include a generator, a condenser, an evaporator, and an absorber, with the absorber having a plurality of tubes for receiving, at top ends thereof, a strong absorbent solution from the generator and for receiving, at bottom ends thereof, refrigerant vapors from the evaporator, whereby the refrigerant vapors are absorbed by the strong absorbent solution to form a weak absorbent solution. Wherein inside condenser tubes the refrigerant vapors which are received from the low temperature generator are condensed by virtue of cooling air flowing over the condenser tubes and the heat of absorption is rejected to the air from the absorber.
In most of the conventional air cooled absorption refrigeration systems, there are independent fans for creating a draft of cooling air over the absorber tubes and the condenser tubes. However, such a configuration of providing independent fan units for creating draft of cooling air over the absorber tubes and the condenser tubes is capital intensive, requires more foot print area for installation, requires more maintenance, is less reliable.

Further, conventionally known air-cooled absorption refrigeration systems comprises separate fins disposed on the outer surface of the condenser tubes and the absorber tubes, so as to cool the absorber tubes and the condenser tubes with an air current generated by means of fans. In this arrangement, typically, the fans are arranged vertically in the upper portion of the condenser tubes and the absorber tubes and the air cooled heat exchangers are positioned at the left and right portions thereof. With such configuration of the fans, efficient air cooling and contact of cooling air with the condenser and absorber tubes is not possible.
Few air-cooled absorption refrigeration systems with arrangement of absorber tubes, condenser tubes and fans for creating a draft of cooling air over the condenser tubes and absorber tubes are known in the prior art.
For example, Japanese Published Patent Application JP6185823A (hereinafter referred to as '823 Japanese Published Patent Application) discloses composite channel of absorber and condenser for air cooled absorption refrigerant. In this configuration, the fins are separately mounted on the absorber and condenser with an air duct disposed there-between. However, such a configuration of the fins on the absorber and condenser are difficult to manufacture as a unit and are bulky.
Furthermore, the US Granted Patent US6109060A (hereinafter referred to as '060 US Granted Patent) discloses an air cooled absorption type refrigerating apparatus, wherein an air inlet 16 is formed in a rear surface side vertical wall section 10b, or a single surface of an apparatus main body 10, and an air stream path extends from the air inlet 16 of the rear surface side vertical wall section 10b to air outlets 14a and 14b formed upwardly aslant in an inclined surface section 13 that is also the single surface provided in the opposite direction. In

this air stream path are arranged an air-cooling absorber 17, an air-cooling condenser 19 and fans 15a and 15b provided with their fan axes arranged upwardly aslant in correspondence with the air outlets 14a and 14b. With this arrangement, the air-cooling absorption type refrigerating apparatus is made to have an integrated air intake space. However, such an arrangement air-cooling absorber 17 and an air-cooling condenser 19 require plurality of fans 15a and 15b and still the fans fail to uniformly distribute the cooling air over the air-cooling absorber 17 and an air-cooling condenser 19.
The low temperature generator facilitates separation of the refrigerant from the weak absorbent solution received in the low temperature generator and supplies the refrigerant to the condenser and absorbent to the absorber. Conventionally, the low temperature generator is a separate sub-system that receives weak absorbent solution carrying refrigerant therewith. According, the low temperature generator requires high foot print area for installation, as such the use of independent low temperature generator sub-system for facilitating separation of the refrigerant from the weak absorbent solution received in the low temperature generator is capital intensive, requires more foot print area for installation. Further, with such configuration of the low temperature generator the vapor pressure inside the low temperature generator becomes high, evaporation of the refrigerant is suppressed, and higher source temperature is required for separation. Further, the air-cooled absorption refrigeration systems utilizing independent low temperature generator sub-systems are in-effective, expensive and bulky.
Accordingly, there is a need for an air-cooled vapor absorption system that enhances the refrigeration effect of the air-cooled absorption refrigeration system and provides compact configuration to the air-cooled vapor absorption system and also reduces the foot print of the air-cooled vapor absorption system.

A drawback of these known air cooled absorption refrigeration systems is that the air cooled heat transfer surface area and the fan installation area is very high; therefore the system installation area or footprint area is very large and the system is bulky.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment
herein satisfies, are as follows:
An object of the present disclosure is to provide a vapor absorption system provided with an air cooling arrangement, wherein a common fan provides draft of cooling air to the absorber tubes and the condenser tubes, thereby resulting in considerable capital cost saving.
Another object of the present disclosure is to provide a vapor absorption system provided with an air cooling arrangement that requires less installation area or footprint area.
Still another object of the present disclosure is to provide a vapor absorption system provided with an air cooling arrangement that is having ease of maintenance.
Still another object of the present disclosure is to provide a vapor absorption system provided with an air cooling arrangement that is more reliable.

Yet another object of the present disclosure is to provide a vapor absorption system provided with an air cooling arrangement that is compact in construction.
Another object of the present disclosure is to provide an air-cooled vapor absorption system having an operative top header of condenser that can accommodate low temperature generator sub-systems.
Yet another object of the present disclosure is to provide a low temperature generator that is accommodated in operative top header of condenser that enhances the separation of refrigerant of the air-cooled absorption refrigeration system.
Still another object of the present disclosure is to provide an operative top header that provides compact configuration to the air-cooled vapor absorption system.
These objects and other advantages of the present disclosure will be more apparent from the following description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The disclosure will now be described with the help of the accompanying drawings, in which,
Figure 1a - FIGURE 1c illustrate a schematic representation of an arrangement of absorber tubes and condenser tubes for an air cooled vapor absorption system in accordance with the present disclosure, wherein the

absorber tubes and the condenser tubes are part of a single heat exchanger and are separated by a partition plate;
Figure 1d and le illustrates a schematic representation wherein a single heat exchanger is used as an absorber and condenser and a partition plate is disposed inside the top and bottom header for separating the absorber and the condenser, wherein the distribution of absorber and condenser tube can be symmetric or non-symmetric.
Figure 2 illustrates a schematic representation of the arrangement of absorber tubes, condenser tubes, and a common fan assembly for providing a draft of cooling air to the absorber tubes and the condenser tubes, in accordance with the present disclosure;
Figure 3 illustrates an isometric view of a common tube plate for supporting absorber tubes and condenser tubes of the air cooled vapor absorption system in accordance with an embodiment of the present disclosure, wherein the common tube plate is having a polygonal configuration and at least few of the absorber tubes and condenser tubes are disposed along at least one of the side portions of the common tube plate and the remaining of the absorber tubes and condenser tubes are disposed along the remaining side portions of the common tube plate and a common fan is centrally disposed for creating a draft of cooling air over the absorber tubes and the condenser tubes, with such configuration the cooling air passes through the absorber tubes and the condenser tubes; and
Figure 4 illustrates a schematic of the assembly of a low temperature generator inside a condenser top header, in accordance with an embodiment of the present disclosure.

SUMMARY
An air cooled vapor absorption system is disclosed in accordance with an embodiment of the present disclosure. The air cooled vapor absorption system includes an evaporator, an absorber, a condenser, a low temperature generator and at least one fan. The evaporator evaporates liquid refrigerant to generate refrigerant vapors and thereby extract heat from the environment. The absorber receives the refrigerant vapors generated in the evaporator, wherein the refrigerant vapors are absorbed in a strong absorbent solution to form dilute refrigerant rich absorbent, the absorber is having a plurality of absorber tubes extending between a top and a bottom header and through which strong absorbent solution and refrigerant vapors flow. The condenser condenses the refrigerant vapors, the condenser is having a plurality of operatively vertically arranged condenser tubes disposed parallel to each other and extending between the top and the bottom header. The low temperature generator is disposed inside the operative top header. The housing of the low temperature generator is having a plurality of openings configured on side walls thereof for facilitating flow of refrigerant vapors carried with weak absorbent solution from interior of the housing to the operative top header. At least one common fan creates a draft of air that passes over the absorber tubes and the condenser tubes that are disposed around the at least one common fan. The absorber and condenser tubes are part of the same heat exchanger and are connected to a common top and bottom header to form a closed arrangement of absorber and condenser tubes and are separated by a partition plate disposed within the top and bottom header.
Typically, the low temperature generator includes housing, a plurality of operatively horizontally arranged heat exchange tubes, a plurality of openings configured on either side of side walls of the housing. The housing is in fluid

communication with the condenser tubes and receives refrigerant carried with dilute refrigerant rich absorbent. The horizontally arranged heat exchange tubes are disposed inside, the housing and facilitates separation of refrigerant from the dilute refrigerant rich absorbent received from the absorber and supply refrigerant to the condenser. The plurality of openings configured on either side of side walls of the housing facilitate flow of refrigerant vapors from interior of the housing of the low temperature generator to said operative top header.
Typically, absorber and condenser are part of the same heat exchanger and connected to a common top and bottom header and are air tightly separated by a partition plate disposed within the top and bottom header.
Typically, the condenser tubes and absorber tubes are arranged in parallel and a series of common continuous integrally formed fins extend along the condenser tubes and the absorber tubes.
In another embodiment, the absorber tubes and the condenser tubes are arranged in series and are provided with a series of common continuous fins formed on an outer periphery thereof for facilitating air cooling."
Generally, the condenser tubes and the absorber tubes are supported between a pair of common tube plates.
In accordance with an embodiment, the condenser tubes are separated from the absorber tubes by a partition plate disposed in said operative top header and said operative bottom header.

Typically, the each of said common tube plates has a polygonal configuration
and the absorber tubes are disposed along at least one of the side portions of
each of the common tube plate and the condenser tubes are disposed along the
remaining side portions of each of the common tube plate and the at least one
common fan is centrally disposed for creating a draft of cooling air over the
absorber tubes and the condenser tubes.
In another embodiment, the common tube plate is having a polygonal configuration and at least few of the absorber tubes and condenser tubes are disposed along at least one of the side portions of the common tube plate and the remaining of the absorber tubes and condenser tubes are disposed along the remaining side portions of the common tube plate and at least one common fan is centrally disposed for creating a draft of cooling air over the absorber tubes and the condenser tubes, with such configuration the cooling air first passes through the absorber tubes and then passes through the condenser tubes
Typically, the evaporator is disposed at the operative bottom of the system and the fan is disposed at the operative top with the absorber and the condenser tubes disposed along all sides of the common tube plates, the fan is removably mounted on the system to access the interior of the system for maintenance.
DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The disclosure will now be described with reference to the accompanying drawings which do not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.
Conventional air-cooled absorption refrigeration system include a generator, a condenser, an evaporator, and an absorber, with the absorber having a plurality

of tubes, particularly an bank of vertically disposed tubes for receiving at top ends thereof, a strong absorbent solution from the generator and for receiving at bottom ends thereof, refrigerant vapors from the evaporator, whereby the refrigerant vapors are absorbed by the strong absorbent solution to form a weak absorbent solution. The refrigerant which is separated from the weak absorbent solution in the generator is condensed in the condenser. In most of the conventional air cooled absorption refrigeration systems, there are independent fans for creating a draft of cooling air over the absorber tubes and the condenser tubes. However, such a configuration of providing independent fan units for creating draft of cooling air over the absorber tubes and the condenser tubes is capital intensive, requires more foot print area for installation, requires more maintenance, is less reliable.
The present invention envisages a compact air-cooled vapor absorption system in which the fan installation area and the footprint area is significantly reduced by using a common fan for heat rejection from the air-cooled absorber tubes and the air-cooled condenser tubes. As the draft of cooling air is directed to the condenser tubes and absorber tubes, condensation of the evaporated refrigerant flowing through the condenser tubes occurs and heat rejection from the absorber tubes occurs. Further, in case of the compact air-cooled vapor absorption system of the present disclosure, the air cooling of the absorber tubes is enhanced by providing fins at the periphery thereof. Further absorber and condenser are a part of single heat exchanger and are separated in top and bottom header by using at least one partition plate. Absorber and condenser uses integral common fins, wherein the integral common fins are of any type or configuration. The present arrangement gives optimized performance due to the effective use of the temperature glide, thereby providing a higher COP, higher cooling capacity, reduced size, reduced weight and economy.

Figures la-2 illustrates an air cooled vapor absorption system in accordance with an embodiment of the present disclosure. The vapor absorption system includes an evaporator, an absorber, a condenser and a low temperature generator. The evaporator evaporates liquid refrigerant to generate refrigerant vapors and thereby extracts heat from the environment. The absorber receives the refrigerant vapors generated in the evaporator, wherein the refrigerant vapors are absorbed in a strong absorbent solution to form dilute refrigerant rich absorbent. The absorber is having a plurality of absorber tubes extending between a top and a bottom header and through which strong absorbent solution and refrigerant vapors flow. The condenser condenses the refrigerant vapors. The condenser is having a plurality of operatively vertically arranged condenser tubes disposed parallel to each other and extending between the top and the bottom header. The low temperature generator is functionally coupled to the condenser and separates the refrigerant from dilute refrigerant rich absorbent and directs the refrigerant to the condenser and the absorbent to the absorber.
The absorber and condenser are made in single heat exchanger using the integral common fins. The absorber and condenser are functionally separated in the operative top header and operative bottom header by using at least one partition plate. This arrangement is shown in Figures- la, lb, lc, Id and le. More specifically, Figure la illustrates a top view of the tube arrangement having a bank of absorber tubes 112 and condenser tubes 122. Figure lb illustrates a front view of the tube arrangement having bank of absorber tubes 112 and the condenser tubes 122 (not illustrated in Figure lb). Figure lc illustrates a front view of the tube arrangement having a bank of absorber tubes 112 and condenser tubes 122. The absorber section of absorber tubes 112 is separated from the condenser section of condenser tubes 112 by means of at least one partition plate 130 (illustrated in Figure la). The partition plate 130 air tightly separates the condenser tubes and the absorber tubes to form separate

compartments, one for absorber tubes and another for condenser tubes. The absorber tubes 112 and the condenser tubes 122 are supported by means of a common-tube plate 116. The distribution arrangement, particularly header 114, provided on the absorber tubes 112 sprays the strong absorbent solution in the absorber tubes 112. A series of continuous integrally formed fins are provided on the absorber tubes 112 and the condenser tubes 122 for facilitating cooling by the circulating cooling air. The arrangement as illustrated in the Figure la -Figure lc allows use of a common fan for creating a draft of cooling air over the absorber and the condenser tubes 112 and 122, thereby resulting in reduced fan power consumption, reduced size, reduced weight and reduced cost of the Vapor Absorption System. Figure Id and le illustrates a schematic representation of an arrangement of absorber tubes 112 and condenser tubes 122 for an-air cooled vapor absorption system, wherein the absorber and condenser are part of single heat exchanger and separated functionally by the partition plate disposed in the operative top and bottom header. Further, the arrangement of the absorber tubes and the condenser tubes over the common tube plate 116 can be symmetric as illustrated in Figure le or^it can be non-symmetric as illustrated in Figure Id.. The partition plate 130 disposed at the top header and the bottom header separates the absorber tubes 112 from the condenser tubes 122. The partition plate 130 can have different configurations depending upon the arrangement of the absorber tubes 112 and the condenser tubes 122 on the tube plate 116.
Generally, a fan powered by a motor is used for creating a draft of cooling air that passes over the condenser tubes 122 and the absorber tubes 112. The fan and motor assembly 140 is illustrated in the Figure 2 of the accompanying drawings and is used for creating a draft of cooling air over the absorber and the condenser tubes 112 and 122 respectively. The arrangement of the absorber section having absorber tubes 112 and the condenser section having condenser

tubes 122, is divided by the partition plate 130, and the arrangement of the fan and motor assembly 140 with respect to the absorber and the condenser tubes 112 and 122 as illustrated in Figure 2, such a configuration of the fan and motor assembly 140, the absorber and the condenser tubes 112 and 122 facilitates better contact of the cooling air over the absorber and the condenser tubes 112 and 122. The absorber and the condenser tubes 112 and 122 are supported over a common tube plate 116. The distribution assembly, particularly the header 114 configured on operative top of each of the absorber tubes of the absorber section is illustrated in the Figure 2 facilitate uniform distribution of the strong absorbent solution to the absorber tubes 112. The absorber section and the condenser section are separated by a partition plate 130. The condenser tubes 122 and the absorber tubes 112 are supported by the common tube plate 116. Further, such an arrangement of the condenser tubes 122, the absorber tubes 112 results in reduced size, reduced weight and reduced cost of the Vapor Absorption System.
Figure 3 illustrates an isometric view of a common tube plate 116a for supporting absorber tubes 112a and condenser tubes 122a of the air cooled vapor absorption system in accordance with present disclosure, wherein the common tube plate 116a has a polygonal configuration and at least one of the absorber tubes 112a and condenser tubes 122a are disposed along at least one of the side portions of the common tube plate 116a and the remaining absorber tubes 112a and condenser tubes 122a are disposed along the remaining side portions of the common tube plate 116a. A common fan 140a is centrally disposed for creating a draft of cooling air over the absorber tubes 112a and the condenser tubes 122a, the draft of cooling air generated by the common fan 140a passes through the absorber tubes 112a and passes through the condenser tubes 122a. With such a configuration the absorber tubes and condenser tubes are arranged in a closed configuration around the at least one fan. The

evaporator is disposed at the operative bottom of the system and the fan 140 is disposed at the operative top with the absorber and the condenser tubes disposed along all sides of the common tube plates, the fan 140 is removably mounted on the system to access the interior of the system for maintenance. The arrangement of the absorber tubes 112a and the condenser tubes 122a can be changed to achieve different configurations. In accordance with one embodiment, out of the four sides of the common tube plate 116b, the absorber tubes can be arranged along more than one side and the condenser tubes can be arranged on the remaining side. Further, the position of the absorber tubes 112a and the condenser tubes 122a can be interchanged. Further, the common fan 140a can be removed from common tube plate 116a for accessing the interior for maintenance of the interior. With such configuration, there is convenience of maintenance. Further, .such configuration results in about 20 percent reduction in foot print area as more number of absorber and condenser tubes can be supported and air cooling can be provided to more number of absorber and condenser tubes.
In accordance with another embodiment of the present disclosure, the common tube plate for supporting the absorber tubes and condenser tubes of the air cooled vapor absorption system has a rectangular configuration, wherein out of the four sides of the common tube plate, the absorber tubes can be arranged along the 3 sides and the condenser tubes can be arranged on the remaining side.
As illustrated in Figure 3, the absorber and condenser tubes are arranged along the four sides of the tube plate and form 4 sides. However, the absorber and condenser tubes are arranged along all sides of a polygon to further reduce footprint area and enhance air cooling contact area. Further, the position of the absorber tubes 112a and the condenser tubes 122a can be interchanged. Further,

the common fan 140a can be removed from common tube plate 116a for accessing the interior for maintenance of the absorber tubes 112a and condenser tubes 122a With such configuration, there is convenience of maintenance. Further, such configuration results in about 20 percent reduction in foot print area asj more number of absorber and condenser tubes can be supported and air cooling can be provided to more number of absorber and condenser tubes.
The evaporator is accommodated in the space at the bottom of the heat exchanger bank, opposite to the fan. This absorber, condenser, fan and evaporator configuration considerably reduces the foot print area and also enables the use of a common fan which results in reduction of fan power requirement.
The size of the air cooled vapor absorption system is further reduced by providing a low temperature generator in the condenser header, particularly in the condenser top header. The present arrangement gives optimized performance due to the effective use of the temperature glide, thereby providing a higher COP, higher cooling capacity, reduced size, reduced weight and economy. Figures 4 illustrates condenser sub-system, having a top header 114 -divided into header portion 114a and 114b, wherein header portion 114a can accommodate low temperature generator 141 of the air-cooled absorption refrigeration system, thereby providing compact configuration to the air-cooled vapor absorption system. More specifically, the condenser sub-system for an air cooled vapor absorption system includes the header portion 114a and a low temperature generator 141. The header portion 114a is disposed adjacent to an the header portion 114b of the air cooled vapor absorption system. The condenser header 114a uniformly distributes a weak absorbent solution received from the operatively vertically disposed absorber tubes 112 to the operatively vertically disposed condenser tubes 122. The header portion 114a includes a

tube plate 116 disposed on an operative top of the condenser tubes 122 and has a plurality of apertures, wherein each aperture is receives an operative top open end of a corresponding condenser tube. The low temperature generator 141 is disposed inside the header portion 114a and includes housing "H", a plurality of operatively horizontally arranged heat exchange tubes 142 and a plurality of openings 150 configured on either side of side walls of the housing. In according to one embodiment, the openings 150 configured on the side walls of the housing are in the form of elongate slots axially extending along the length of the housing. The housing is in fluid communication with the condenser tubes 122. The plurality of operatively horizontally arranged heat exchange tubes 142 are disposed inside the housing and facilitate separation of refrigerant and supplies the refrigerant to the condenser. The plurality of openings 150 , configured on either side of side walls of the housing facilitate flow of refrigerant vapors carried with the weak absorbent solution from interior of the housing of the low temperature generator 141 to the header portion 114a. With such configuration there is about 30-40 percent less pressure drop as compared to when the flow of vapors is from one side only.
The plurality of openings 150 provided on the side walls of the housing of the low temperature generator 140 disposed inside the header portion 114a facilitates refrigerant vapor flow from the low temperature generator 141 to the
header portion 114a from where the refrigerant vapors are directed back to the condenser tubes 122. Thus, the header portion 114a acts as a connection
between the generator 140 and the condenser tubes 122 for vapor flow.
The evaporator is accommodated in the space at the bottom of the heat exchanger bank, opposite to the fan. This configuration of the absorber, condenser, fan and evaporator considerably reduces the foot print area and also

enables the use of a single fan which results in reduction of fan power requirement.
TECHNICAL ADVANTAGES
The air-cooled vapor absorption system, as described in the present disclosure has several technical advantages including but not limited to the realization of:
• an air-cooled vapor absorption system provided with an air cooling arrangement, wherein a common fan provides draft of cooling air to the absorber tubes and the condenser tubes, thereby resulting in considerable capital cost saving;
• an air-cooled vapor absorption system provided with an air cooling arrangement that requires less installation area or footprint area;
• an air-cooled vapor absorption system provided with an air cooling arrangement that requires less maintenance;
• an air-cooled vapor absorption system provided with an air cooling arrangement that is more reliable; and
• an air-cooled vapor absorption system provided with an air cooling arrangement that is compact in construction;
• an air-cooled vapor absorption system having an operative top header that can accommodate low temperature generator sub-systems;
• an air-cooled vapor absorption system having an operative top header that enhances the refrigeration effect of the air-cooled absorption refrigeration system; and

• an air-cooled vapor absorption system having an operative top header that provides compact configuration to the air-cooled vapor absorption system.
Throughout this specification the word1 "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
The use of the expression "at least" or "at least one" suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in'"the field relevant to the disclosure as it existed anywhere before the priority date of this application.
The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and at is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or .quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.
In view of the wide variety of embodiments to which the principles of the present disclosure can be applied, it should be understood that the illustrated

embodiments are exemplary only. While considerable emphasis has been placed herein on the particular features of this disclosure, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principle of the disclosure. These and other modifications in the nature of the disclosure or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

We Claim:
1. An air cooled vapor absorption system comprising:
• an evaporator adapted to evaporate liquid refrigerant to generate refrigerant vapors and thereby extracts heat from the environment;
• an absorber adapted to receive said refrigerant vapors generated in said evaporator, wherein said refrigerant vapors are absorbed in a strong absorbent solution to form dilute refrigerant rich absorbent, said absorber having a plurality of absorber tubes extending between a top and a bottom header and through which strong absorbent solution and refrigerant vapors flow;
• a condenser adapted to condense said refrigerant vapors carried with said dilute refrigerant rich absorbent, said condenser having a plurality of operatively vertically arranged condenser tubes disposed parallel to each other and extending between said top and said bottom header;
• a low temperature generator functionally coupled to said condenser and adapted to separate said refrigerant from dilute refrigerant rich absorbent and directs said condensed refrigerant to said condenser and said absorbent to said absorber,
characterized in that
(i) said low temperature generator is disposed inside said operative top header, housing of said low temperature generator having a plurality of openings configured on side walls thereof for facilitating flow of refrigerant vapors carried with weak absorbent

solution from interior of said housing to said operative top header, and (ii) at least one common fan adapted to create a draft of air that passes over said absorber tubes and said condenser tubes that are disposed around said at least one common fan, said absorber and condenser tubes being part of the same heat exchanger and being connected to a common top and bottom header to form a closed arrangement of absorber and condenser tubes and being air tightly separated by a partition plate disposed within said top and bottom header.
2. The air cooled vapor absorption system as claimed in claim 1, wherein
said low temperature generator comprising:
o housing in fluid communication with said condenser tubes and adapted to receive refrigerant vapors carried with dilute refrigerant rich absorbent flowing through said condenser tubes;
oa plurality of operatively horizontally arranged heat exchange tubes disposed inside said housing and adapted to facilitate separation of refrigerant from said dilute refrigerant rich absorbent and supply said refrigerant to said condenser; and
oa plurality of openings configured on either side of side walls of said housing for facilitating flow of refrigerant vapors carried with weak absorbent solution from interior of said housing of said low temperature generator to said operative top header.
3. The air cooled vapor absorption system as claimed in claim 1, wherein
absorber and condenser are part of the same heat exchanger and

connected to a common top and bottom header and are air tightly separated by a partition plate disposed within said top and bottom header.
4. The air cooled vapor absorption system as claimed in claim 1, wherein each of said absorber tubes and condenser tubes are provided with a series of continuous common fins for absorber and condenser tubes formed on an outer periphery thereof for facilitating air cooling.
5. The air cooled vapor absorption system as claimed in claim 1, wherein said condenser tubes and said absorber tubes are supported between a pair of common tube plates.
6. The air cooled vapor absorption system as claimed in claim 1, wherein said condenser tubes are separated from said absorber tubes by a partition plate disposed in the operative top header and the operative bottom header.
7. The air cooled vapor absorption system as claimed in claim5, wherein each of said common tube plates has a polygonal configuration and said absorber tubes and condenser tubes are disposed along all sides of said tube plates.
8. The air cooled vapor absorption system as claimed in claim 5, wherein each of said common tube plates has a polygonal configuration and said absorber tubes are disposed along at least one of the side portions of each

of said common tube plate and said condenser tubes are disposed along the remaining side portions of each of said common tube plate and said at least one common fan is centrally disposed for creating a draft of cooling air over said absorber tubes and said condenser tubes.
9. The air cooled vapor absorption system as claimed in claim 5, wherein said evaporator is disposed at the operative bottom of said system, said fan being disposed at the operative top with said absorber and said condenser tubes disposed along all sides of said common tube plates, said fan is removably mounted on the system to access interior of said system for maintenance.