CN217031651U - Compressed air conditioning system - Google Patents
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- CN217031651U CN217031651U CN202220139939.6U CN202220139939U CN217031651U CN 217031651 U CN217031651 U CN 217031651U CN 202220139939 U CN202220139939 U CN 202220139939U CN 217031651 U CN217031651 U CN 217031651U
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Abstract
The utility model belongs to the technical field of heat exchange, and particularly provides a compressed air conditioning system. The system aims to solve the problem that the existing system cannot be normally used when power is off. Therefore, the compressed air conditioning system comprises a first cooling-back pipeline, a second cooling-back pipeline, a centrifugal machine, a first air cooler, a compression-expansion all-in-one machine, a second air cooler and a gas storage branch, wherein two ends of the first cooling-back pipeline are respectively connected with the indoor and the centrifugal machine, two ends of the first air cooler are respectively communicated with the centrifugal machine and a gas inlet of a compression end of the compression-expansion all-in-one machine, a liquid storage tank is arranged on the gas storage branch, one end of the gas storage tank is connected between the first air cooler and the compression end of the compression-expansion all-in-one machine, a gas outlet of the compression end of the compression-expansion all-in-one machine is communicated with the second air cooler, two ends of the second cooling-back pipeline are respectively communicated with the second air cooler and a gas inlet of an expansion end of the compression-expansion all-in-one machine, and a gas outlet of the expansion end of the compression-expansion all-in-one machine is communicated with the indoor so as to ensure that the compressed air conditioning system can be normally used when power is cut off.
Description
Technical Field
The utility model belongs to the technical field of heat exchange, and particularly provides a compressed air conditioning system.
Background
In view of air-conditioning refrigeration technology, it is known that various refrigerants used in the air-conditioning refrigeration technology cause serious damage to the earth ozone layer due to pursuit of human beings for refrigeration, and new environment-friendly refrigerants have various problems of flammability, explosiveness, toxicity, easiness in generating greenhouse effect, high price and the like to different degrees. Therefore, the application of more environmentally friendly refrigerants is required by the California amendments, the F-Gas regulations of the fluorine-containing Gas of the European Union, the national refrigerant replacement schemes and the like.
In recent years, technicians gradually find that air is a ubiquitous gas and has the advantages of being non-toxic, odorless, convenient to collect, environment-friendly and the like. Air is an excellent environment-friendly refrigerant, and has a series of environmental protection and cost advantages. Firstly, air is available at any place, and in view of production, the method not only saves the purchase cost, the transportation cost and the storage cost of the traditional refrigerant, but also reduces the complicated process flows of vacuumizing, fluorine injection and the like so as to integrally reduce the production cost; secondly, the air is nontoxic and odorless, is environment-friendly, is not afraid of leakage, has simple requirements on the operation and maintenance of an air conditioning system, and can save most of the maintenance cost. Although the air refrigeration has many advantages, the air refrigeration has poor refrigeration performance and is indiscernible, and based on the characteristic of poor refrigeration performance, the existing air conditioning system using air for heat exchange has low heat exchange efficiency and high overall energy consumption. In addition, taking the air conditioning system for the computer lab as an example, current air conditioning system just can't normally use in case of the outage, and this can lead to the heat that the computer lab produced to pile up certainly, just can make the computer lab temperature rise sharply even in the short time, still can directly lead to the computer lab equipment to lose because of high temperature when serious to bring huge loss.
Accordingly, there is a need in the art for a new compressed air conditioning system that addresses the above-mentioned problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems that the existing compressed air conditioning system is low in heat exchange efficiency, high in overall energy consumption and incapable of being used normally in power failure.
The utility model provides a compressed air conditioning system which comprises a recooling device, a centrifugal machine, a first air cooler, a compression and expansion integrated machine, a second air cooler and a gas storage branch,
the cold returning device comprises a first cold returning pipeline and a second cold returning pipeline, the first cold returning pipeline and the second cold returning pipeline can exchange heat,
the air inlet end of the first cooling-back pipeline is communicated with the indoor space, the air outlet end of the first cooling-back pipeline is connected with the air inlet end of the centrifuge, the air outlet end of the centrifuge is communicated with the air inlet end of the first air cooler,
the exhaust end of the first air cooler is communicated with the air inlet of the compression end of the compression-expansion all-in-one machine,
a first end of the gas storage branch is provided with a gas storage tank, a second end of the gas storage branch is connected between the exhaust end of the first air cooler and the gas inlet of the compression end of the compression-expansion all-in-one machine,
an air outlet of a compression end of the compression and expansion all-in-one machine is communicated with an air inlet end of the second air cooler,
the exhaust end of the second air cooler is communicated with the air inlet end of the second recooling pipeline, the exhaust end of the second recooling pipeline is communicated with the air inlet of the expansion end of the compression and expansion integrated machine, and the exhaust port of the expansion end of the compression and expansion integrated machine is communicated with the indoor space.
In the preferred technical scheme of the compressed air conditioning system, an air compressor is further arranged on the air storage branch.
In the preferable technical scheme of the compressed air conditioning system, the air storage branch is also provided with a first control valve,
the first control valve is located downstream of the air compressor.
In the preferable technical scheme of the compressed air conditioning system, a pressure stabilizing valve is also arranged on the air storage branch,
the pressure maintaining valve is located downstream of the first control valve.
In the preferable technical scheme of the compressed air conditioning system, the air storage tank is a high-pressure air storage tank.
In a preferred embodiment of the above compressed air conditioning system, the compressed air conditioning system further comprises a check valve,
the check valve is located between the exhaust end of the first air cooler and the second end of the air storage branch.
In the above preferred technical solution of the compressed air conditioning system, the compressed air conditioning system further includes a bypass branch,
one end of the bypass branch is connected between the exhaust end of the second air cooler and the air inlet end of the second cooling return pipeline, and the other end of the bypass branch is connected between the exhaust end of the second cooling return pipeline and the air inlet of the expansion end of the compression and expansion integrated machine.
In a preferred embodiment of the above compressed air conditioning system, the compressed air conditioning system further comprises a three-way valve,
the inlet of the three-way valve is connected with the exhaust end of the second air cooler, the first outlet of the three-way valve is connected with the air inlet end of the second cooling-back pipeline, and the second outlet of the three-way valve is connected between the exhaust end of the second cooling-back pipeline and the air inlet of the expansion end of the compression-expansion all-in-one machine.
In the preferred technical solution of the above compressed air conditioning system, the compressed air conditioning system further includes a cooling branch,
one end of the cooling branch is communicated with the indoor space, and the other end of the cooling branch is arranged near the second air cooler.
In a preferred embodiment of the above compressed air conditioning system, a second control valve is provided on the cooling branch.
Under the condition of adopting the technical scheme, the compressed air conditioning system comprises a recooling machine, a centrifugal machine, a first air cooler, a compression-expansion all-in-one machine, a second air cooler and a gas storage branch circuit, wherein the recooling machine comprises a first recooling pipeline and a second recooling pipeline, the first recooling pipeline and the second recooling pipeline can exchange heat, the gas inlet end of the first recooling pipeline is communicated with the indoor space, the gas outlet end of the first recooling pipeline is connected with the gas inlet end of the centrifugal machine, the gas outlet end of the centrifugal machine is communicated with the gas inlet end of the first air cooler, the gas outlet end of the first air cooler is communicated with the gas inlet of the compression end of the compression-expansion all-in-one machine, the first end of the gas storage branch circuit is provided with a gas storage tank, the second end of the gas storage branch circuit is connected between the gas outlet end of the first air cooler and the gas inlet of the compression end of the compression-expansion all-in-one machine, the air outlet of the compression end of the compression-expansion all-in-one machine is communicated with the air inlet end of the second air cooler, the air outlet end of the second air cooler is communicated with the air inlet end of the second cooling-back pipeline, the air outlet end of the second cooling-back pipeline is communicated with the air inlet of the expansion end of the compression-expansion all-in-one machine, and the air outlet of the expansion end of the compression-expansion all-in-one machine is communicated with the indoor space. Firstly, the air is used as the refrigerant to exchange heat so as to realize green refrigeration, the air has the advantages of no toxicity, no harm, environmental friendliness and the like, the resource is rich, the air is easy to obtain, a plurality of expenses such as purchase, transportation, storage and the like are saved, the air is used as the refrigerant, a system is not required to be kept in a vacuum state, leakage is avoided, and the production and maintenance cost is effectively reduced; secondly, the recoolers are additionally arranged at the primary compression inlet and the secondary cooling outlet so as to effectively improve the heat exchange efficiency and reduce the energy consumption, and the compression and expansion integrated machine can recover the expansion work as the secondary compression input work so as to further achieve the effect of reducing the energy consumption; in addition, the compressed air conditioning system has the advantages of simple integral structure, convenience in assembly and low production cost. In addition, the compressed air-conditioning system adopts two-stage compression and two-stage heat dissipation, so that the heat exchange efficiency of the system can be improved to the maximum extent. In addition, the compressed air conditioning system can maintain normal refrigeration for a period of time during power failure by arranging the air storage branch, so that a certain time is strived for power supply rush repair or standby power access.
Furthermore, the air compressor and the pressure stabilizing valve are arranged on the air storage branch circuit to effectively ensure the pressure stability, the air storage branch circuit of the utility model has simple structure and low cost, and the high-pressure air storage tank is used as common equipment and even does not need to be arranged independently and can be directly shared with engineering equipment, thereby further reducing the cost.
Furthermore, the bypass branch is arranged, so that the air conditioning system can utilize natural cooling, the energy input is reduced, and the overall energy consumption is effectively reduced; in addition, the utility model also provides the three-way valve so as to effectively reduce unnecessary flow resistance loss and cold loss.
Furthermore, the cooling branch is arranged, so that indoor air is introduced to the vicinity of the second air cooler, and the indoor air can be used as heat dissipation airflow of the second air cooler to cool the second air cooler, and further the refrigeration efficiency is effectively improved.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic overall structure of a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the internal structure of the integrated compression and expansion machine of the present invention;
reference numerals:
11. a recooling device; 111. a first recooling pipeline; 112. a second recooling pipeline;
12. a centrifuge;
13. a first air cooler;
14. a compression and expansion integrated machine; 141. compressing the impeller; 142. an expansion impeller; 143. a connecting shaft;
15. a second air cooler;
16. a gas storage branch; 161. a gas storage tank; 162. an air compressor; 163. a first control valve; 164. a pressure maintaining valve;
17. a one-way valve;
18. a bypass branch; 181. a three-way valve;
19. a cooling branch; 191. a second control valve;
101. and (4) a machine room.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, although the compressed air conditioning system of the preferred embodiment is used for cooling a machine room, it is obvious that the present invention is not limited thereto, and the specific application scenario of the compressed air conditioning system is not limited, and the technician can select the system according to the actual application requirement. Such changes as to specific application scenarios are not to be considered as a departure from the basic principles of the present invention and are intended to fall within the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, it should be noted that, unless otherwise explicitly stated or limited, the terms "connected," "connected," and "communicating" are used in the description of the present invention in a broad sense and can be, for example, directly connected or indirectly connected through an intermediate medium, or can be internal to two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring first to fig. 1, there is shown a schematic overall structure of a preferred embodiment of the present invention. As shown in fig. 1, the direction indicated by the arrow in fig. 1 is a medium flow direction, the compressed air conditioning system of the present invention includes a recooling device 11, a centrifuge 12, a first air cooling device 13, a compression-expansion all-in-one machine 14, a second air cooling device 15, and an air storage branch 16, the recooling device 11 includes a first recooling pipe 111 and a second recooling pipe 112, and the first recooling pipe 111 and the second recooling pipe 112 can exchange heat. As a preferred arrangement, the first cooling back pipe 111 is shaped like a "U", the second cooling back pipe 112 is shaped like an "L", and a part of the second cooling back pipe 112 is located between two parallel pipes of the first cooling back pipe 111, so as to effectively improve the heat exchange efficiency. Certainly, this setting mode is only a preferred setting mode, and a technician may also set the specific structure and the positional relationship of the first cooling-back pipeline 111 and the second cooling-back pipeline 112 according to the actual use requirement, as long as the first cooling-back pipeline 111 and the second cooling-back pipeline 112 can exchange heat. In addition, the air inlet end of the first cooling-back pipeline 111 is communicated with the machine room 101, the air outlet end of the first cooling-back pipeline 111 is connected with the air inlet end of the centrifuge 12, the air outlet end of the centrifuge 12 is communicated with the air inlet end of the first air cooler 13, the air outlet end of the first air cooler 13 is communicated with the air inlet of the compression-expansion integrated machine 14 (i.e. the left end in fig. 1), the left end of the air storage branch 16 is provided with an air storage tank 161, and the air storage tank 161 is preferably a high-pressure liquid storage tank, the right end of the air storage tank 161 is connected between the air outlet end of the first air cooler 13 and the air inlet of the compression-expansion integrated machine 14, the air outlet of the compression-expansion integrated machine 14 is communicated with the air inlet end of the second air cooler 15, the air outlet end of the second air cooler 15 is communicated with the air inlet end of the second cooling-back pipeline 112, the air outlet end of the second cooling-back pipeline 112 is communicated with the air inlet of the expansion integrated machine 14 (i.e. the right end in fig. 1), the exhaust port of the expansion end of the compression-expansion integrated machine 14 is communicated with the machine room 101. It should be noted that the utility model does not limit the specific types of the elements, and the technical personnel can set the types according to the actual use requirements; for example, the first air cooler 13 may be a dry air cooler, a wet air cooler, or a combined dry and wet air cooler; also for example, the types of the first air cooler 13 and the second air cooler 15 may be the same or different, which is not restrictive.
Referring next to fig. 2, there is shown a schematic view of the internal structure of the compression-expansion integrated machine of the present invention. As shown in fig. 2, in the present preferred embodiment, a compression impeller 141, an expansion impeller 142, and a connecting shaft 143 for connecting the compression impeller 141 and the expansion impeller 142 are provided in the compression-expansion integrated machine 14. Through the coaxial arrangement mode, the expansion work obtained by the expansion impeller 142 can be effectively transmitted to the compression impeller 141 to realize the recovery of the expansion work, and further, the effect of reducing the energy consumption is effectively achieved. Preferably, the compression-expansion integrated machine 14 in the present invention employs a centrifugal compressor and a centrifugal expander, so that the integrated machine has a large air volume, thereby effectively adapting to the use requirements of large air volume and small pressure ratio, and further effectively improving the working efficiency. It should be noted that the above-mentioned arrangement is only a preferable configuration, and a skilled person may set the specific configuration of the compression-expansion integrated machine 14 according to actual use requirements, as long as the compression-expansion integrated machine 14 can achieve the compression-expansion effect.
Further, with reference to fig. 1, as a preferred arrangement, the air compressor 162, the first control valve 163 and the pressure maintaining valve 164 are further sequentially disposed on the air storage branch 16 according to the air flow direction (i.e. from left to right in the drawing), wherein the first control valve 163 is preferably a ball valve, and the first control valve 163 is configured to be closed when the system is normally powered on and opened when the system is powered off, and the inlet side pressure of the pressure maintaining valve 164 can be automatically adjusted according to actual requirements. Of course, it should be noted that the above-mentioned setting mode is only a preferred setting mode, the specific types and setting sequences of the air compressor 162, the first control valve 163 and the pressure maintaining valve 164 are not limited by the present invention, and technicians may also adjust the setting modes according to actual needs; for example, the first control valve 163 may be a check valve instead of a ball valve, which is not restrictive. In addition, the compressed air conditioning system further includes a check valve 17, and the check valve 17 is located between the discharge end of the first air cooler 13 and the right end of the air storage branch 16 to better control the flow direction of the air, which is not a limiting arrangement.
Further, in the preferred embodiment, the compressed air conditioning system further includes a bypass branch 18, a left end of the bypass branch 18 is connected between the exhaust end of the second air cooler 15 and the air inlet end of the second cooling return line 112, a right end of the bypass branch 18 is connected between the exhaust end of the second cooling return line 112 and the air inlet of the expansion end of the integrated compressor-expander 14, and the bypass branch 18 and the second cooling return line 112 are set to be alternatively communicated. As a preferable configuration, the compressed air conditioning system further includes a three-way valve 181, an inlet (i.e., a lower port in fig. 1) of the three-way valve 181 is connected to the discharge end of the second air cooler 15, a first outlet (i.e., an upper port in fig. 1) of the three-way valve 181 is connected to the intake end of the second cooling return line 112, and a second outlet (i.e., a right port in fig. 1) of the three-way valve 181 is connected between the discharge end of the second cooling return line 112 and the intake of the expansion end of the integrated compression and expansion machine 14. It should be noted that the manner of implementing the alternative communication by setting the three-way valve 181 is not limited, and a technician may set other setting manners according to actual use requirements, as long as the effect of implementing the alternative communication between the bypass branch 18 and the second cooling return line 112 can be achieved. Based on the arrangement of the bypass branch 18, the compressed air conditioning system of the utility model can selectively cut off the second cold return pipeline 112 according to actual requirements, so as to effectively avoid the flow resistance of the second cold return pipeline 112 and further effectively improve the refrigeration efficiency; as a preferable control mode, when the system is normally powered on, the three-way valve 181 controls the inlet to be communicated with the first outlet; when the system is powered off, the three-way valve 181 controls the communication between the inlet and the second outlet to block the second cooling-back line 112.
In addition, the compressed air conditioning system in the preferred embodiment further includes a cooling branch 19, an upper end of the cooling branch 19 is communicated with the machine room 101, a lower end of the cooling branch 19 is disposed near the second air cooler 15, so as to introduce the air in the machine room 101 into the vicinity of the second air cooler 15, and the indoor air can be used as a heat dissipation airflow of the second air cooler 15 to cool the second air cooler 15, thereby effectively improving the cooling efficiency. It should be noted that the cooling branch 19 is not connected to the second air cooler 15, but an air outlet thereof is disposed near the second air cooler 15, so that the air discharged from the cooling branch 19 is blown onto the second air cooler 15, thereby achieving a cooling effect. Further, a second control valve 191 is provided on the cooling branch 19, and the second control valve 191 is preferably a ball valve to control the on-off state of the cooling branch 19. As a preferred control, the second control valve 191 is set to close when the system is normally powered and to open when the system is powered down.
Based on the above structural arrangement, during normal power supply, the compressed air conditioning system of the utility model can suck normal temperature air from the machine room 101, the normal temperature air is heated by the first cooling-back pipeline 111 of the recooling machine 11, then enters the centrifuge 12 for first-stage compression to obtain high-temperature and high-pressure air, and is discharged into the first air cooler 13, the high-temperature and high-pressure air is subjected to heat dissipation by the first air cooler 13, then enters the compression end of the compression-expansion all-in-one machine 14 for second-stage compression to obtain high-temperature air with higher pressure, and is discharged into the second air cooler 15, the high-temperature and high-pressure air is subjected to heat dissipation by the second air cooler 15, then enters the second cooling-back pipeline 112 of the recooling machine 11 for heat exchange with the normal temperature air from the machine room 101 in the first cooling-back pipeline 111, so as to further cool, and then enters the expansion end of the compression-expansion all-in-one machine 14 to be throttled into low-temperature and normal-pressure air, and then discharged into the machine room 101, so as to cool the machine room 101. When the system is powered off, the first control valve 163 and the second control valve 191 are both opened, high-pressure air stored in the air storage tank 161 is depressurized through the air storage branch 16, then enters the compression end of the compression-expansion all-in-one machine 14 for secondary compression to obtain high-temperature air with higher pressure, and is discharged into the second air cooler 15, the high-temperature and high-pressure air is radiated by the second air cooler 15, then directly enters the expansion end of the compression-expansion all-in-one machine 14 through the second outlet of the three-way valve 181 to be throttled into low-temperature and normal-pressure air, and then is discharged into the machine room 101, so that the machine room 101 is cooled; in the process, the cooling branch 19 can introduce the low-temperature air in the machine room 101 into the vicinity of the second air cooler 15 to cool the air.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the utility model, and the technical scheme after the changes or substitutions can fall into the protection scope of the utility model.
Claims (10)
1. A compressed air conditioning system is characterized by comprising a recooling device, a centrifugal machine, a first air cooler, a compression and expansion integrated machine, a second air cooler and an air storage branch,
the cold returning device comprises a first cold returning pipeline and a second cold returning pipeline, the first cold returning pipeline and the second cold returning pipeline can exchange heat,
the air inlet end of the first cooling-back pipeline is communicated with the indoor space, the air outlet end of the first cooling-back pipeline is connected with the air inlet end of the centrifugal machine, the air outlet end of the centrifugal machine is communicated with the air inlet end of the first air cooler,
the exhaust end of the first air cooler is communicated with the air inlet of the compression end of the compression-expansion all-in-one machine,
a first end of the gas storage branch is provided with a gas storage tank, a second end of the gas storage branch is connected between the exhaust end of the first air cooler and the gas inlet of the compression end of the compression-expansion all-in-one machine,
an exhaust port at the compression end of the compression and expansion all-in-one machine is communicated with an air inlet end of the second air cooler,
the exhaust end of the second air cooler is communicated with the air inlet end of the second recooling pipeline, the exhaust end of the second recooling pipeline is communicated with the air inlet of the expansion end of the compression and expansion integrated machine, and the exhaust port of the expansion end of the compression and expansion integrated machine is communicated with the indoor space.
2. The system of claim 1, further comprising an air compressor in the air storage branch.
3. The compressed air conditioning system of claim 2 wherein said air storage branch is further provided with a first control valve,
the first control valve is located downstream of the air compressor.
4. A compressed air conditioning system according to claim 3 wherein a surge damping valve is also provided in said storage branch,
the pressure maintaining valve is located downstream of the first control valve.
5. The compressed air conditioning system of claim 1 wherein said air reservoir is a high pressure air reservoir.
6. A compressed air conditioning system according to any one of claims 1 to 5 further comprising a one-way valve,
the check valve is located between the exhaust end of the first air cooler and the second end of the gas storage branch.
7. The compressed air conditioning system of any one of claims 1 to 5, further comprising a bypass branch,
one end of the bypass branch is connected between the exhaust end of the second air cooler and the air inlet end of the second cooling-back pipeline, and the other end of the bypass branch is connected between the exhaust end of the second cooling-back pipeline and the air inlet of the expansion end of the compression-expansion all-in-one machine.
8. The compressed air conditioning system of claim 7, further comprising a three-way valve,
an inlet of the three-way valve is connected with an exhaust end of the second air cooler, a first outlet of the three-way valve is connected with an air inlet end of the second cooling-back pipeline, and a second outlet of the three-way valve is connected between the exhaust end of the second cooling-back pipeline and an air inlet of an expansion end of the compression-expansion all-in-one machine.
9. A compressed air conditioning system according to any one of claims 1 to 5 further comprising a cooling branch,
one end of the cooling branch is communicated with the indoor space, and the other end of the cooling branch is arranged near the second air cooler.
10. A compressed air conditioning system according to claim 9 wherein a second control valve is provided in the cooling branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220139939.6U CN217031651U (en) | 2022-01-19 | 2022-01-19 | Compressed air conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220139939.6U CN217031651U (en) | 2022-01-19 | 2022-01-19 | Compressed air conditioning system |
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| CN217031651U true CN217031651U (en) | 2022-07-22 |
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| CN202220139939.6U Active CN217031651U (en) | 2022-01-19 | 2022-01-19 | Compressed air conditioning system |
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