Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
COOLING OF AIR AND OTHER GASES
Document Type and Number:
WIPO Patent Application WO/2018/211483
Kind Code:
A1
Abstract:
The present subject matter relates to a cooling assembly (102) for cooling of air and gases that includes a first channel (104) to receive a cooling agent (210), a second channel (106), and a third channel (108). The first channel (104) may receive a cooling fluid to carry the vapours of the cooling agent formed by absorption of heat. The second channel (106) is in fluidic communication with the first channel (104) to supply the cooling fluid to the first channel (104). The third channel (108) is fluidically isolated from the first and second channels (104) (106), is to receive an inlet stream. Further, the cooling fluid and the inlet stream may dissipate heat to the first channel (104) such that a temperature of an outlet stream from the third channel (108) is around a dew-point temperature of the cooling fluid.

Inventors:
SINGHAL, Vishal (H-202, P.F. Housing Indian School of Business, Hyderabad, Gachibowli 1, 500 111, IN)
Application Number:
IB2018/053562
Publication Date:
November 22, 2018
Filing Date:
May 21, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SINGHAL, Vishal (H-202, P.F. Housing Indian School of Business, Hyderabad, Gachibowli 1, 500 111, IN)
International Classes:
F28D5/00; F24F1/00; F24F5/00; F28D5/02; F28D7/16; F28D21/00
Domestic Patent References:
WO2016037232A12016-03-17
Foreign References:
US20130125545A12013-05-23
US20020073718A12002-06-20
US20050210907A12005-09-29
Other References:
None
Attorney, Agent or Firm:
LAKSHMIKUMARAN, Malathi et al. (B6/10, Safdarjung Enclave, New Delhi 9, 110029, IN)
Download PDF:
Claims:
I/We Claim:

1. A cooling assembly (102) for cooling of air and gases, comprising:

a first channel (104), to receive a cooling agent, wherein the first channel (104) is to receive a cooling fluid to carry the vapours of the cooling agent formed by evaporation of the cooling agent;

a second channel (106), to receive the cooling fluid, in fluidic communication with the first channel (104) to supply the cooling fluid to the first channel (104), wherein the first channel (104) is in a heat-exchange configuration with the second channel (106) to absorb heat from the cooling fluid in the second channel (106); and a third channel (108) fluidically isolated from the first channel (104) and the second channel (106) to receive an inlet stream, wherein the first channel (104) is in a heat-transfer configuration with the third channel (108) to absorb heat from the inlet stream in the third channel (108) such that a temperature of an outlet stream from the third channel (108) is close to a dew point temperature of the cooling fluid in the second channel (106).

2. The cooling assembly (102) as claimed in claim 1, wherein the third channel (108) forms a primary channel (202) of the cooling assembly (102) and the first channel (104) and second channel (104) form a secondary channel (204) of the cooling assembly (102).

3. A cooling assembly (102), comprising:

at least one primary channel (202) to receive a first fluid stream (212); at least one secondary channel (204) to receive a second fluid stream (214), the at least one secondary channel (204) is fluidically isolated from the at least one primary channel (202) and in a heat-exchange configuration with the at least one primary channel (202), the at least one secondary channel (204) comprising: at least one dry secondary channel (206) to receive the second fluid stream (214); and

at least one wet secondary channel (208) fluidly coupled and in a heat-exchange configuration with the at least one dry secondary channel (206), the at least one wet secondary channel (208) to receive a cooling agent (210), wherein the at least one wet secondary channel (208) is to receive the second fluid stream (214) to carry the vapours of the cooling agent (210) from the at least one wet secondary channel (208) formed upon absorption of heat from the at least one wet secondary channel (208).

4. The cooling assembly (102) as claimed in claim 3, wherein a temperature of the second fluid stream (214) received by the at least one wet secondary channel (208) is around a dew point temperature of the inlet second fluid stream (214).

5. The cooling assembly (102) as claimed in claim 3, wherein the at least one wet secondary channel (208) is in a heat-transfer configuration with the at least one primary channel (202) to absorb heat from the first fluid stream (212) in the at least one primary channel (202) such that a temperature of the first fluid stream (212) in the at least one primary channel (202) is close to a dew point temperature of the second fluid stream (214).

6. The cooling assembly (102) as claimed in claim 3, wherein the at least one wet secondary channel (208) comprises an egress port (218) that allows the second fluid stream (214) in the at least one wet secondary channel (208) to exit from the cooling assembly (102).

7. The cooling assembly (102) as claimed in claim 3, further comprises: a cooling agent inlet to allow ingress of the cooling agent (210) in the at least one wet secondary channel (208); and

a cooling agent outlet to allow egress of the cooling agent (210) from the at least one wet secondary channel (208).

8. The cooling assembly (102) as claimed in claim 3, wherein the at least one primary channel (202) comprises a primary inlet to allow ingress of the first fluid stream (212) in the at least one primary channel (202). 9. The cooling assembly (102) as claimed in claim 3, wherein the at least one primary channel (202) comprises a primary outlet to allow egress of the first fluid stream (212) from the at least one primary channel (202).

10. The cooling assembly (102) as claimed in claim 3, wherein the at least one dry secondary channel (206) comprises an ingress port that allows the second fluid stream

(214) in the at least one dry secondary channel (206) to enter the cooling assembly (102).

11. The cooling assembly (102) as claimed in claim 3, wherein the at least one primary channel (202) is in a heat transfer contact with one side of the at least one wet secondary channel (208) and the at least one dry secondary channel (206) is in a heat transfer contact with other side of the at least one wet secondary channel (208).

12. A cooling assembly (102) for cooling of air, comprising:

at least one primary channel (202) to receive a first fluid stream (212); a plurality of secondary channels (204-1, 204-2) to receive a second fluid stream (214-1, 214-2), the plurality of secondary channels (204-1, 204-2) is fluidically isolated from the at least one primary channel (202) and in a heat- exchange configuration with the at least one primary channel (202), the plurality of secondary channels (204-1, 204-2) comprising;

a plurality of dry secondary channels (206- 1 , 206-2) to receive the second fluid stream (214-1, 214-2); and

a plurality of wet secondary channels (208-1, 208-2, 208-3, 208- 4) fluidly coupled and in a heat-exchange configuration with the plurality of dry secondary channels (206-1, 206-2), the plurality of wet secondary channels (208-1, 208-2, 208-3, 208-4) is to receive a cooling agent (210), wherein the plurality of dry secondary channels (206-1,

206-2) is to receive the second fluid stream (214-1, 214-2) to carry the vapours of the cooling agent (210) from the plurality of wet secondary channels (208-1, 208-2, 208-3, 208-4) formed upon absorption of heat from the plurality of wet secondary channels (208-1, 208-2, 208-3, 208- 4).

13. The cooling assembly (102) as claimed in claim 11, wherein the cooling assembly (102) further comprises a plurality of primary channels (202), wherein each of the plurality of primary channels (202) comprises an inlet.

14. The cooling assembly (102) as claimed in claim 13, wherein the inlets of each of the plurality of primary channels (202) are connected to a single primary inlet duct to allow ingress of the first fluid stream (212) in each of the plurality of primary channels (202).

15. The cooling assembly (102) as claimed in claim 13, wherein each of the plurality of primary channels (202) further comprises a primary outlet.

16. The cooling assembly (102) as claimed in claim 15, wherein the outlets of each of the plurality of primary channels (202) are connected to a single primary outlet duct to allow egress of the first fluid stream (212) from each of the plurality of primary channels (202).

17. The cooling assembly (102) as claimed in claim 12, wherein each of the plurality of secondary channels (204-1, 204-2) comprises an inlet, wherein inlets of each of plurality of secondary channels (204- 1 , 204-2) are connected to a single secondary inlet duct to ingress of the second fluid stream (214-1, 214-2) in each of the plurality of secondary channels (204- 1 , 204-2).

18. The cooling assembly (102) as claimed in claim 12, wherein each of the plurality of secondary channels (204- 1 , 204-2) comprises an outlet, wherein the outlets of each of the plurality of secondary channels (204-1, 204-2) are connected to a single secondary outlet duct to allows egress of the second fluid stream (214-1, 214-2) from each of the plurality of secondary channels (204-1, 204-2).

19. The cooling assembly (102) as claimed in claim 12, wherein the at least one primary channel (202) is in a heat transfer contact with one side of one of the plurality of wet secondary channels (208), and one of the plurality of dry secondary channels (206) is in a heat transfer contact with another side of the one of the plurality of wet secondary channels (208).

20. The cooling assembly (102) as claimed in claim 12, wherein the cooling agent (210) is one of water, and a mixture containing water.

21. The cooling assembly (102) as claimed in claim 12, wherein the first fluid stream (212) and the second fluid stream (214-1, 214-2) are same.

22. The cooling assembly (102) as claimed in claim 12, wherein the first fluid stream (212) and the second fluid stream (214-1, 214-2) are different. 23. The cooling assembly (102) as claimed in claim 12, wherein the first fluid stream (212) is a stream of air received from an enclosed space and the second fluid stream (214-1, 214-2) is ambient air.

AMENDED CLAIMS

received by the International Bureau on 24 October 2018 (24.10.2018)

1. A cooling assembly (102) for cooling of air and gases, comprising:

a first channel (104), to receive a cooling agent, and to receive a cooling fluid, wherein vapours of the cooling agent formed by absorption of heat are carried by the cooling fluid;

a second channel (106), in fluidic communication and in heat-exchange configuration with the first channel (104), wherein the second channel (106) receives the cooling fluid to supply the cooling fluid to the first channel (104), and wherein the first channel (104) is to absorb the heat from the second channel (106) such that an outlet temperature of the cooling fluid from the second channel (106) is close to a dew point temperature of the cooling fluid; and

a third channel (108) fluidically isolated from the first channel (104) and the second channel (106), and in a heat configuration with the first channel (104), to receive an inlet stream, wherein the first channel (104) is to absorb heat from the third channel (108) such that a temperature of an outlet stream from the third channel (108) is close to a dew point temperature of the cooling fluid in the second channel (106).

2. The cooling assembly (102) as claimed in claim 1, wherein the third channel (108) forms a primary channel (202) of the cooling assembly (102) and the first channel (104) and second channel (104) form a secondary channel (204) of the cooling assembly (102).

3. A cooling assembly (102), comprising:

at least one primary channel (202) to receive a first fluid stream (212); at least one secondary channel (204) to receive a second fluid stream

(214), the at least one secondary channel (204) is fluidically isolated from the at least one primary channel (202) and in a heat-exchange configuration with the at least one primary channel (202), the at least one secondary channel (204) comprising:

at least one dry secondary channel (206) to receive the second fluid stream (214); and

at least one wet secondary channel (208) fluidly coupled and in a heat-exchange configuration with the at least one dry secondary channel (206), wherein the at least one wet secondary channel (208) receives a cooling agent (210) and receives the second fluid stream (214), wherein the vapours of the cooling agent (210) formed upon absorption of heat are carried by the second fluid stream (214).

4. The cooling assembly (102) as claimed in claim 3, wherein a temperature of the second fluid stream (214) exiting the at least one dry secondary channel (206) is around a dew point temperature of the inlet second fluid stream (214).

5. The cooling assembly (102) as claimed in claim 3, wherein a temperature of the first fluid stream (212) exiting the at least one primary channel (202) is close to a dew point temperature of the second fluid stream (214). 6. The cooling assembly (102) as claimed in claim 3, wherein the at least one wet secondary channel (208) comprises an egress port (218) that allows the second fluid stream (214) in the at least one wet secondary channel (208) to exit from the cooling assembly (102). 7. The cooling assembly (102) as claimed in claim 3, further comprises:

a cooling agent inlet to allow ingress of the cooling agent (210) in the at least one wet secondary channel (208); and a cooling agent outlet to allow egress of the cooling agent (210) from the at least one wet secondary channel (208).

8. The cooling assembly (102) as claimed in claim 3, wherein the at least one primary channel (202) comprises a primary inlet to allow ingress of the first fluid stream (212) in the at least one primary channel (202).

9. The cooling assembly (102) as claimed in claim 3, wherein the at least one primary channel (202) comprises a primary outlet to allow egress of the first fluid stream (212) from the at least one primary channel (202).

10. The cooling assembly (102) as claimed in claim 3, wherein the at least one dry secondary channel (206) comprises an ingress port that allows the second fluid stream (214) in the at least one dry secondary channel (206) to enter the cooling assembly (102).

11. The cooling assembly (102) as claimed in claim 3, wherein the at least one primary channel (202) is in a heat transfer contact with one side of the at least one wet secondary channel (208) and the at least one dry secondary channel (206) is in a heat transfer contact with other side of the at least one wet secondary channel (208).

12. The cooling assembly (102) as claimed in claim 11, wherein the at least one dry secondary channel (206) is in heat transfer configuration with and is fluidically coupled to the wet secondary channels (208) on either side of the wet secondary channels (208).

13. A cooling assembly (102) for cooling of air, comprising:

at least one primary channel (202) to receive a first fluid stream (212); a plurality of secondary channels (204-1, 204-2) to receive a second fluid stream (214-1, 214-2), the plurality of secondary channels (204-1, 204-2) is fluidically isolated from the at least one primary channel (202) and in a heat- exchange configuration with the at least one primary channel (202), the plurality of secondary channels (204-1, 204-2) comprising;

a plurality of dry secondary channels (206- 1 , 206-2) to receive the second fluid stream (214-1, 214-2); and

a plurality of wet secondary channels (208-1, 208-2, 208-3, 208- 4) fluidly coupled and in a heat-exchange configuration with the plurality of dry secondary channels (206-1, 206-2), the plurality of wet secondary channels (208-1, 208-2, 208-3, 208-4) is to receive a cooling agent (210), wherein the plurality of dry secondary channels (206-1, 206-2) is to receive the second fluid stream (214-1, 214-2) to carry the vapours of the cooling agent (210) from the plurality of wet secondary channels (208-1, 208-2, 208-3, 208-4) formed upon absorption of heat from the plurality of wet secondary channels (208-1, 208-2, 208-3, 208- 4).

14. The cooling assembly (102) as claimed in claim 13, wherein the cooling assembly (102) further comprises a plurality of primary channels (202), wherein each of the plurality of primary channels (202) comprises an inlet.

15. The cooling assembly (102) as claimed in claim 14, wherein the inlets of each of the plurality of primary channels (202) are connected to a single primary inlet duct to allow ingress of the first fluid stream (212) in each of the plurality of primary channels (202).

16. The cooling assembly (102) as claimed in claim 14, wherein each of the plurality of primary channels (202) further comprises a primary outlet.

17. The cooling assembly (102) as claimed in claim 16, wherein the outlets of each of the plurality of primary channels (202) are connected to a single primary outlet duct to allow egress of the first fluid stream (212) from each of the plurality of primary channels (202).

18. The cooling assembly (102) as claimed in claim 13, wherein each of the plurality of secondary channels (204-1, 204-2) comprises an inlet, wherein inlets of each of plurality of secondary channels (204- 1 , 204-2) are connected to a single secondary inlet duct to ingress of the second fluid stream (214-1, 214-2) in each of the plurality of secondary channels (204-1, 204-2). 19. The cooling assembly (102) as claimed in claim 13, wherein each of the plurality of secondary channels (204- 1 , 204-2) comprises an outlet, wherein the outlets of each of the plurality of secondary channels (204-1, 204-2) are connected to a single secondary outlet duct to allows egress of the second fluid stream (214-1, 214-2) from each of the plurality of secondary channels (204-1, 204-2).

20. The cooling assembly (102) as claimed in claim 13, wherein the at least one primary channel (202) is in a heat transfer contact with one side of one of the plurality of wet secondary channels (208), and one of the plurality of dry secondary channels (206) is in a heat transfer contact with another side of the one of the plurality of wet secondary channels (208).

21. The cooling assembly (102) as claimed in claim 13, wherein the cooling agent (210) is one of water, and a mixture containing water.

22. The cooling assembly (102) as claimed in claim 13, wherein the first fluid stream (212) and the second fluid stream (214-1, 214-2) are same. 23. The cooling assembly (102) as claimed in claim 13, wherein the first fluid stream (212) and the second fluid stream (214-1, 214-2) are different.

24. The cooling assembly (102) as claimed in claim 13, wherein the first fluid stream (212) is a stream of air received from an enclosed space and the second fluid stream (214-1, 214-2) is ambient air.

Description:
COOLING OF AIR AND OTHER GASES

TECHNICAL FIELD

[0001] The present subject matter, in general, relates to cooling of air and other gases, and in particular, to a cooling setup for cooling of air and other gases.

BACKGROUND

[0002] Cooling of air finds applications in removing heat from buildings to make them suitable for human and animal habitation. Cooling of air and other gases also finds applications in many industrial and agricultural processes.

BRIEF DESCRIPTION OF DRAWINGS

[0003] The features, aspects, and advantages of the subject matter will be better understood with regard to the following description, and accompanying Fig's. The use of the same reference number in different Fig's indicates similar or identical features and components.

[0004] Fig. 1 illustrates an apparatus for cooling of air, in accordance with an implementation of the present subject matter.

[0005] Fig. 2 illustrates a view of a cooling assembly, in accordance with an implementation of the present subject matter.

[0006] Fig. 3 illustrates another implementation of the cooling assembly, in accordance with an implementation of the present subject matter.

DETAILED DESCRIPTION

[0007] Various techniques are employed for dissipating the heat and cooling air. The most common technique for cooling air is vapour compression refrigeration method. The vapour compression refrigeration method involves use of a refrigerant that undergoes, in a cycle, a phase change by compressing the refrigerant and expanding the refrigerant to cool the refrigerant. Further, the cooled refrigerant is used to absorb heat from the air through a heat exchanger. After the refrigerant has absorbed the heat, the cycle is repeated. Generally, compressing the refrigerant needs a considerable amount of power. Moreover, cooling of air may also result in loss of moisture in the air. Thus, the vapour compression refrigeration method consumes enormous amount of power and affects the moisture of the air. Moreover, refrigerants used in vapour compression technique are typically not environment friendly. Another relatively common method to cool air is evaporative cooling. Evaporative cooling can be direct or indirect. The direct evaporative cooling technique may include allowing a water stream and an air stream to make a direct contact with each other such that water in the water stream evaporates. This accompanies absorption of heat from the air stream for cooling the air. However, evaporation of water in the air stream changes the moisture of the air stream.

[0008] In indirect evaporative cooling, the air stream is cooled by evaporation of water in another air stream. The two air streams are fluidically isolated from each other, but are in heat-exchange configuration with each other. Further, indirect evaporative cooling does not change moisture of the air stream. Generally, coolers implementing indirect evaporative cooling technique may be of different types based on their design and mode of operation. Such indirect evaporative coolers can be sequential indirect evaporative coolers, in-situ indirect evaporative coolers, dew point coolers, and Maisotsenko cycle coolers etc. The sequential indirect evaporative cooler cools the air in two stages and may include a primary air stream and a secondary air stream where the primary air stream is to be cooled during a cooling operation. In first stage, the secondary air stream is cooled by direct evaporative cooling as described above. In the second stage, the cooled secondary air is adapted to cool the primary air stream through a heat exchanger. Another type of evaporative cooler is the in-situ indirect evaporative cooler in which direct evaporation of water in the secondary air stream, and heat transfer with the primary air stream happen in the same device at the same time. [0009] Yet another type of evaporative cooler is the dew point cooler that is similar to the in-situ indirect evaporative cooler. However, in the dew point cooler, a part of the cooled primary air stream is used as the secondary air stream. Further, the Maisotsenko cycle cooler is a specific type of dew point cooler, where the partially cooled primary air stream is repeatedly fed as the secondary air stream, and the secondary air stream flows in a cross direction to the primary air stream. Generally, conventional indirect evaporative coolers may not be able to cool the air to below a wet bulb temperature while maintaining the moisture of the air. Moreover, most systems implementing indirect evaporative cooling methods are complex in structure and operation.

[0010] The present subject matter relates to various aspects for cooling of air and other fluids using a cooling assembly. For example, the cooling assembly implementing the present subject matter is adapted to cool the air to a temperature close to a dew point temperature while at the same time maintaining the moisture in the air. In one aspect, the cooling assembly may include a primary channel, and a secondary channel. Further, the secondary channel may include a wet secondary channel which receives a cooling agent and a dry secondary channel such that the wet secondary channel and the dry secondary channel may be fluidly coupled such that fluid flows from the dry secondary channel to the wet secondary channel, and are in a heat- exchange configuration to exchange heat there between. In one example, an air stream may be passed through the primary channel and cooled by dissipating the heat from the primary channel to the secondary channel. Simultaneously, an air stream may be passed through the dry secondary channel and cooled by dissipating the heat to the wet secondary channel. Further, the cooling agent in the wet secondary channel may absorb heat from its surroundings and evaporate. Further, the primary channel and the secondary channel may be fluidically isolated such that no exchange of mass occurs between the primary channel and the secondary channel, thereby maintaining the moisture of the air in the primary channel. [0011] The present subject matter provides a cooling assembly that can reach much lower temperatures, close to the dew point of air. Moreover, since the primary channel and the secondary channel are fluidically isolated, different air streams can be used in the primary and the secondary channels. This also allows different treatment of air streams in the primary and the secondary channels. This also gives better control on the absolute and relative flow rates of the air streams in the primary and the secondary channels. Moreover, the cooling device based on the present subject matter enables a simpler design.

[0012] These and other advantages of the present subject matter would be described in greater detail in conjunction with the following figures. While aspects relating to cooling of air as described above and henceforth can be implemented in any number of different configurations, the embodiments are described in the context of the following system(s).

[0013] Fig. 1 illustrates an apparatus 100 for cooling of air, in accordance with an implementation of the present subject matter. Further, the apparatus 100 may include one or more cooling assemblies 102 to receive a fluid to cool the fluid to a temperature lower than a dew point temperature. In one example, the fluid can be air, gases, or the like. In one embodiment, the cooling assembly 102 may include multiple channels for allowing flow of the fluid there through. In one example, the fluid may enter from one end of the cooling assembly 102 and may exit from another end of the cooling assembly 102. Although, the embodiments of the cooling assembly 102 are explained with respect to cooling of fluids, it can be used to cool any type of gases.

[0014] In one aspect, the cooling assembly 102 may include a first channel 104, a second channel 106, and a third channel 108. The first channel 104 may receive a cooling agent. The second channel 106 may receive a cooling fluid that may flow through the second channel 106. Further, the first channel 104 may be in a heat- exchange configuration with the second channel 106 to exchange heat between the second channel 106 and the first channel 104. In one embodiment, the first channel 104 may be fluidly coupled to the second channel 106. The first channel 104, for instance, may receive the cooling fluid from the second channel 106. The first channel 104 may further include an egress port that allows the cooling fluid in the first channel 104 to egress from the cooling assembly 102. The second channel 106 may further include an ingress port that allows the cooling fluid to ingress into the cooling assembly 102. The first channel 104 may further include a cooling agent inlet and a cooling agent outlet that allows the cooling agent to circulate through the first channel 104. In other words, the cooling agent inlet allows ingress of the cooling agent into the first channel 104, and the cooling agent outlet allows egress of the cooling agent from the first channel 104.

[0015] According to an aspect, the third channel 108 may be adapted to receive an inlet stream. Further, in one example, the first channel 104 may be in a heat-exchange configuration with the third channel 108 to absorb heat from the inlet stream in the third channel 108. According to an aspect, the cooling agent in the first channel 104 may absorb heat and vaporize such that the first channel 104 may absorb heat from the second channel 106 and the third channel 108 to cool the inlet stream to a temperature close to a dew point temperature. According to an aspect, a temperature of an outlet stream from the third channel 108 is close to a dew point temperature of the cooling fluid in the second channel 106. In one example, the inlet stream of the third channel 108 is cooled to a temperature above to the wet-bulb temperature. In another example, the inlet stream of the third channel 108 is cooled to a temperature below to the wet- bulb temperature. According to an aspect, the cooling fluid entering into the first channel 104 may carry the vapours of the cooling agent from the first channel 104. According to an aspect, the third channel 108 may be fluidically isolated from the first channel 104 and the second channel 106 such that no exchange of mass occurs between the third channel 108 and the first channel 104 or between the third channel 108 and the second channel 106. Since the third channel 108 is fluidly isolated from the first channel 104 and the second channel 106, the inlet stream in the third channel 108 is cooled to close to the dew point temperature of the cooling fluid in the second channel 106 without changing moisture content of the inlet stream.

[0016] In one example, the first channel 104 may be arranged in between the second channel 106 and the third channel 108 such that the first channel 104 may absorb the heat from both the second channel 106 and the third channel 108. Although, the cooling assembly 102 is described with respect one first channel 104, one second channel 106, and one third channel 108, it can include more than one first channel 104, more than one second channel 106 and more than one third channel 108. Further, the structural and operational details of the cooling assembly 102 are explained in detail with respect to Fig. 2.

[0017] Fig. 2 illustrates a view of the cooling assembly 102, in accordance with an implementation of the present subject matter. The cooling assembly 102 may include a primary channel 202 and a secondary channel 204. In one example, the primary channel 202 can be the third channel 108 (shown in Fig. 1). The secondary channel 204 may further include a dry secondary channel 206 and a wet secondary channel 208. In one example, the dry secondary channel 206 can be the second channel 106 (shown in Fig. 1) and the wet secondary channel 208 can be the first channel 104 (shown in Fig. 1). Further, the primary channel 202 is adapted to receive a first fluid stream 212 and the secondary channel 204 is adapted to receive a second fluid stream 214.

[0018] In the illustrated aspect, the primary channel 202 may be fluidically isolated from the secondary channel 204 such that no mass exchange occurs between the primary channel 202 and the secondary channel 204. In addition, the primary channel 202 is in the heat-exchange configuration with the secondary channel 204. In one aspect, the primary channel 202 may allow the first fluid stream 212 to enter through a first end of the primary channel 202 and exit through a second end of the primary channel 202. In one example, the primary channel 202 may include a primary inlet to allow ingress of the first fluid stream 212 to the primary channel 202. In another example, the primary channel 202 may include a primary outlet to allow egress of the first fluid stream 212 from the primary channel 202. In one example, the primary channel 202 may include a filter and a dehumidifier, to clean and to dehumidify the first fluid stream 212. In one implementation, the first fluid stream 212 and the second fluid stream 214 can be the same stream. In another implementation, the first fluid stream 212 and the second fluid stream 214 can be different streams. In one embodiment, the first fluid stream 212 can be a stream of air received from an enclosed space, such a room, a car, or a building, or the like. Further, for instance, the second fluid stream 214 can be ambient air. For example, the primary channel 202 may receive air from a room, and the secondary channel 204 may receive the ambient air from atmosphere (i.e., outside of room).

[0019] According to an example, the wet secondary channel 208 may receive a cooling agent 210 and the dry secondary channel 206 may receive the second fluid stream 214. The dry secondary channel 206 is in a heat-exchange configuration with the wet secondary channel 208 to allow heat-exchange between the dry secondary channel 206 and the wet secondary channel 208. In one embodiment, evaporation of the cooling agent 210 in the wet secondary channel 208 leads to absorption of heat from the second fluid stream 214 in the dry secondary channel 206. Moreover, evaporation of the cooling agent 210 in the wet secondary channel 208 also leads to absorption of heat from the first fluid stream 212 in the primary channel 202. In one example, the cooling agent 210 can be water, a water-based solution, such as water- glycol solution, water-alcohol solution, or a mixture containing water or any other evaporative fluids known in the art.

[0020] In one aspect, a first end of the dry secondary channel 206 may receive the second fluid stream 214, and a second end of the dry secondary channel 206 may be coupled with one end of the wet secondary channel 208. Further, a cooled fluid stream 216 formed after cooling of the second fluid stream 214 may enter the wet secondary channel 208. Further, the cooled fluid stream 216 may exit at the other end of the wet secondary channel 208. In one example, evaporation of the cooling agent 210 may result in reduction in temperature of the wet secondary channel 208. In one example, the wet secondary channel 208 may be cooled to a temperature below that of the first fluid stream 212 in the primary channel 202 in order to maintain heat flow between the primary channel 202 and the wet secondary channel 208. In one embodiment, the wet secondary channel 208 may absorb heat from the first fluid stream 212 in the primary channel 202 to cool the first fluid stream 212 close to the dew point temperature of the second fluid stream 214.1n one example, the wet secondary channel 208 may be cooled to a temperature below that of the second fluid stream 214 in the dry secondary channel 206 in order to maintain heat flow between the dry secondary channel 206 and the wet secondary channel 208. In one embodiment, the wet secondary channel 208 may absorb heat from the second fluid stream 214 in the dry secondary channel 206 to cool the second fluid stream 214 close to the dew point temperature of the second fluid stream 214.

[0021] In one example, an outlet temperature of the second fluid stream 214 may be limited to the dew point temperature of the second fluid stream 214. Further, limiting the temperature to the dew point temperature of the second fluid stream 214 may limit an outlet temperature of the first fluid stream 212 to the dew point temperature of the second fluid stream 214. Hence, the lowest temperature up to which the cooling assembly 102 can cool is the dew-point temperature of the second fluid stream 214. However, such limitations are theoretical. Practical considerations may limit the lowest temperature in most applications to about 0.5-1.0 °C or more above the dew point temperature. In addition, there can be situations where the design or operation of the cooling assembly 102 may be set for maximizing the heat transfer instead of minimizing the temperature of the first fluid stream 212. Moreover, since total heat transfer also takes the amount of fluid flow into consideration in addition to the drop in the temperature of the second fluid stream 214, the outlet temperature of the first fluid stream 212 might be significantly higher than the dew-point temperature of the second fluid stream 214. [0022] In one embodiment, the wet secondary channel 208 may include an egress port 218 coupled at an end of the wet secondary channel 208. The egress port 218 allows the cooled fluid stream 216 in the wet secondary channel 208 to exit from the cooling assembly 102 while carrying the vapour of the cooling agent 210. Although Fig. 2 illustrates single primary and secondary channel, the cooling assembly 102 may include multiple primary and multiple secondary channels. An example implementation of the cooling assembly 102 with multiple secondary channels is explained in detail with respect to Fig. 3.

[0023] Fig. 3 illustrates another configuration of the cooling assembly 102 including at least one primary channel 202 and more than one secondary channels 204, in accordance with one implementation of the present subject matter. As mentioned before, the primary channel 202 may be arranged in the heat-exchange configuration with the one or more secondary channels 204- 1 , 204-2, collectively referred to as 204 hereinafter, to allow exchange of heat between the first fluid stream 212 in the primary channel 202 and the second fluid streams 214-1, 214-2, collectively referred to as 214 hereinafter, in the secondary channels 204. In one embodiment, the primary channel 202 may be arranged in parallel with respect to the secondary channels 204.

[0024] The one or more secondary channels 204 further include one or more dry secondary channels 206- 1 , 206-2, collectively referred to as 206 hereinafter, and one or more wet secondary channels 208-1, 208-2, 208-3, 208-4, collectively referred to as 208 hereinafter, as shown in Fig. 3. In one example, the primary channel 202 may be surrounded by the one or more wet secondary channels 208. Further, the wet secondary channels 208 may be positioned adjacent to the primary channel 202 to allow heat exchange between the wet secondary channels 208 and the first fluid stream 212 in the primary channel 202. In one embodiment, the wet secondary channels 208 are positioned in the heat-exchange configuration with the dry secondary channels 206 to exchange heat between the second fluid streams 214 in the dry secondary channels 206 and the wet secondary channels 208 to obtain the cooled fluid stream 216-1, 216-2, collectively referred to as 216 hereinafter. Simultaneously, the cooling agent 210 in the wet secondary channels 208 may evaporate due to absorption of heat.

[0025] In one example, the wet secondary channels 208 are adapted to receive the cooled fluid streams 216, having a temperature of the cooled fluid streams 216 close to the dew point temperature, to carry vapour from the cooling agent 210 in the wet secondary channel 208 to maintain a temperature of the wet secondary channels 208 below a temperature of the first fluid stream 212 in the primary channel 202. In one example, a part of the cooling agent 210 may be converted into vapour and the cooled fluid stream 216 carries the vaporized part from the wet secondary channel 208. In another example, all of the cooling agent 210 may be converted into vapour and all the vapours may be carried by the cooled fluid stream 216. In another example, only one or more components of the cooling agent 210 may be converted into vapour and the cooled fluid stream 216 carries the vaporized components from the wet secondary channel 208. In another example, whole of the cooling agent 210 may be converted into vapour and all the vapours may be carried by the cooled fluid stream 216.

[0026] In one aspect, each of the primary channel 202 may include an inlet and an outlet. Further, the inlets of each of the primary channel 202 may be connected to a single primary inlet duct (not shown in Fig.) to allow ingress of the first fluid stream 212 in each of the primary channel 202. In one embodiment, inlets of primary channels 202 may be isolated from one another. Also, the outlets of each of the primary channel 202 may be connected to a single primary outlet duct (not shown in Fig.) to allow egress of the first fluid stream 212 from each of the primary channel 202. In another aspect, each of the secondary channels 204 may include an inlet and outlet. In one example, inlet of the each of the secondary channel 204 may be connected to a single secondary inlet duct (not shown in Fig.) to allow ingress of the second fluid streams 214 in the secondary channels 204. Further, outlet of each of the secondary channel 204 may be connected to a single secondary outlet duct (not shown in Fig.) to allow egress of the cooled fluid stream 216 from the secondary channels 204. In one embodiment, the single primary inlet duct and the single secondary inlet duct may be a same duct, in case where the first fluid stream 212 and the second fluid stream 214 are the same.

[0027] In the implementation shown in Fig. 3, the primary channel 202 and secondary channels 204 are formed by straight parallel plates separating different flows. However, non-straight and/or non-parallel plates can also be used. Also, other geometries such as a honeycomb structure and its variations can also be used to form the primary channel 202 and secondary channels 204. Further, other kinds of heat exchangers such as shell and tube heat exchangers can also be used in the cooling assembly 102. In one example, a flow of the first fluid stream 212 in the primary channel 202, and a flow of the second fluid stream 214 and the cooled fluid stream 216 in the secondary channels 204 may be in a zig zag arrangement to increase the effective length of the primary channel 202 and the secondary channels 204. The cooling assembly 102 is able to cool the fluid to temperatures lower than the wet bulb temperature of air and up to about 80-90% to a dew point temperature of air.

[0028] In one example, the primary channel 202 and the wet secondary channel 208 may be positioned in such a way that the primary channel 202 may have two wet secondary channels 208 positioned on each side of the primary channel 202. In other words, the primary channel 202 is sandwiched by two wet secondary channels 208. Further in another example, the dry secondary channel 206 and the wet secondary channel 208 may be positioned in such a way that the dry secondary channel 206 may have two wet secondary channels 208 positioned on each side of the dry secondary channel 206. In other words, the dry secondary channel 206 is sandwiched by two wet secondary channels 208. Further in another example, the primary channel 202 may be in a heat transfer contact with one side of the wet secondary channel 208, and the dry secondary channel 206 may be in a heat transfer contact with another side of the wet secondary channel 208. Further, the same arrangement may be repeated multiple times. [0029] The operation of the cooling assembly 102 will now be described. The first fluid stream 212 and the second fluid streams 214 may be fed into the primary channel 202 and into the dry secondary channels 206 respectively. The cooling agent 210 may be introduced in the wet secondary channels 208 through the cooling agent inlet. As the cooled fluid stream 216 enters the wet secondary channels 208, evaporation of the cooling agent 210 happens. The latent heat transfer associated with the evaporation causes a drop in the temperature of the cooled fluid stream 216 and the wet secondary channels 208. Since the primary channel 202 and the dry secondary channels 206 are in a heat-exchange configuration with the wet secondary channels 208, heat is transferred from the first fluid stream 212 passing through the primary channel 202 and the second fluid stream 214 passing through the dry secondary channels 206, to the cooled fluid stream 216 passing through the wet secondary channels 208. This leads to a drop in temperature of the first fluid stream 212 and the second fluid stream 214. Since the second fluid stream 214 in the dry secondary channels 208 is directed as the cooled air stream 216 in the wet secondary channels 208, temperature of the cooled air stream 216 entering the wet secondary channels 208 also goes down. Further, continued evaporation of the cooling agent 210 causes further latent heat transfer which results in further drop in the temperature of the cooled fluid stream 216, which causes further drop in temperature of the first fluid stream 212 and the second fluid stream 214. Since the second fluid stream 214 is directed as the cooled air stream 216, temperature of the cooled fluid stream 216 entering the wet secondary channels 208 drops further. This cycle of evaporation of the cooling agent 210, drop in temperature of the cooled fluid stream 216, drop in temperature of the first fluid stream 212 and drop in temperature of the second fluid stream 214 can continue till the temperature of the cooled fluid stream 216 entering the wet secondary channels 208 reaches a dew point temperature of the cooled fluid stream 216. When the temperature of the cooled fluid stream 216 is at the dew point temperature, evaporation of the cooling agent 210 cannot happen anymore. Thus, the cycle of lowering of temperatures of the cooled fluid stream 216, the first fluid stream 212 and the second fluid stream 214 may be stopped. In one example, the first fluid stream 212 may be cooled to a temperature close to the dew point temperature of the second fluid stream 214. Simultaneously, the second fluid streams 214 in the dry secondary channels 206 may also be cooled to a temperature close to the dew point temperature to obtain the cooled fluid stream 216. In one example, the vapour of the cooling agent 210 may be carried by the cooled fluid stream 216 in the wet secondary channels 208. In one example, the first fluid stream 212 may be cooled gradually due to the absorption of the heat from the first fluid stream 212. Also, vapours of the cooling agent 210 along with the cooled fluid stream 216 may exit from the cooling assembly 102 and fresh cooling agent 210 may be fed into the wet secondary channels 208 to continue the operation of the cooling assembly 102.

[0030] Although concepts relating to cooling of air and other gases have been described in the language specific to the above-mentioned features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features are disclosed and explained in the context of a few aspects of cooling of air and other gases.