Water-cooling direct-expansion air conditioning system for metro and using method

Abstract

The invention discloses a subway water-cooling direct expansion air conditioning system and a using method, the system comprises a cooling tower side cooling tower water circulation pipe network and a direct expansion air conditioning unit pipe network, the cooling tower side cooling tower water circulation pipe network is a cooling tower side water circulation double-parallel pipe network, the direct expansion air conditioning unit pipe network is connected with the cooling tower side cooling tower water circulation pipe network, and the direct expansion air conditioning unit pipe network is connected with the cooling tower side cooling tower water circulation pipe network. Air is supplied to the station public area and the station equipment area; the using method comprises the following steps that the cooling tower side cooling tower water circulation pipe network is used for cooling and supplying circulating water; the low-temperature circulating water exchanges heat with the direct expansion air conditioning unit pipe network; the direct expansion air conditioning unit pipe network generates cold air through heat exchange; a refrigerant in a pipe network of the direct expansion air conditioning unit completes phase change circulation; the water-cooling direct-expansion combined air conditioning unit realizes the control of the temperature and humidity of the public area of the station; the water-cooling direct-expansion cabinet type air conditioning unit achieves control over the temperature and humidity of a station equipment area. Compared with a traditional design scheme, a chilled water system is omitted, heat exchange links are reduced, and the device is simpler and more energy-saving.

Description

Technical Field

[0001] The invention belongs to the technical field of urban rail transit, and in particular relates to a water-cooled direct expansion air-conditioning system for a subway and a use method thereof. Background Art

[0002] The traditional air conditioning system for the public area and equipment management area of ​​the station adopts a full air return air conditioning system, and the main equipment includes air conditioning units and return and exhaust fans. The air conditioning water system adopts a cooling tower plus a chiller unit, and the main equipment includes a cooling tower, a cooling water pump, a chiller unit, a chilled water pump, a constant pressure water supply device, a water treatment device, etc.

[0003] The heat in the station needs to be discharged to the outdoor atmosphere through the primary air system cycle and the secondary water system cycle. The air system cycle is mainly the air cycle of "air conditioning terminal-station public area and equipment area". The air conditioning unit sends the cooled air to the station for cooling. The return air system is sent to the mixing box in front of the air conditioning unit through the return exhaust fan to form a primary air system cycle. The secondary water system cycle includes the cooling water system cycle and the chilled water system cycle. The chilled water system cycle is mainly the water cycle of "chiller-air conditioning terminal", in which the chilled water pump provides power; the cooling water system cycle is mainly the water cycle of "cooling tower-chiller", in which the cooling water pump provides power. The more times the heat is transferred, the greater the heat loss, and the lower the overall energy efficiency ratio, resulting in the inability to further improve the energy saving potential. At the same time, the traditional design of the chilled water equipment room has a large area due to the large number of equipment, which increases the civil engineering investment.

[0004] In view of the above problems, it is urgent to develop an energy-saving, new urban rail transit ventilation and air-conditioning design scheme, which has important value and significance for energy saving and low carbon of urban rail transit. Summary of the invention

[0005] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a subway water-cooled direct expansion air-conditioning system and a use method thereof.

[0006] The technical solution of the present invention is: a water-cooled direct expansion air-conditioning system for a subway, comprising a cooling tower water circulation pipeline network on the cooling tower side and a direct expansion air-conditioning unit pipeline network, wherein the cooling tower water circulation pipeline network on the cooling tower side is a cooling tower side water circulation double parallel pipeline network, and the direct expansion air-conditioning unit pipeline network is connected to the cooling tower water circulation pipeline network on the cooling tower side, and supplies air to the public area and the equipment area of ​​the station.

[0007] Furthermore, the cooling tower water circulation pipe network on the cooling tower side includes a cooling tower, the output end of the cooling tower is connected to the input end of the cooling water pump, and the input end of the cooling tower is connected to the output end of the water collector in the pipe network of the direct expansion air-conditioning unit.

[0008] Furthermore, the output end of the cooling water pump is communicated with the input end of the water distributor in the pipe network of the direct expansion air-conditioning unit.

[0009] Furthermore, the pipe network of the direct expansion air-conditioning unit includes a water distributor, which includes multiple output ends, and the output ends are respectively connected to the water-cooled direct expansion combined air-conditioning unit and the water-cooled direct expansion cabinet air-conditioning unit, and water is distributed in the water distributor.

[0010] Furthermore, the output ends of the water-cooled direct expansion combined air-conditioning unit and the water-cooled direct expansion cabinet air-conditioning unit are connected to the input end of the water collector, and water is collected in the water collector.

[0011] Furthermore, the air processed by the water-cooled direct expansion combined air-conditioning unit is delivered to the public area of ​​the station through the air duct, so as to control the temperature and humidity of the public area of ​​the station.

[0012] Furthermore, the air processed by the water-cooled direct expansion cabinet air-conditioning unit is sent to the station equipment area through the air duct to achieve the control of temperature and humidity in the station equipment area.

[0013] Furthermore, an input end of the water collector is connected to an output end of a constant-pressure water replenishing device, and water is replenished through the constant-pressure water replenishing device.

[0014] A method for using a water-cooled direct expansion air conditioning system for a subway comprises the following steps: A. Cooling tower side cooling tower water circulation network for circulating water cooling and supply; B. Low-temperature circulating water and direct expansion air conditioning unit pipe network realize heat exchange; C. The pipe network of the direct expansion air conditioning unit produces cold air through heat exchange; D. The refrigerant in the pipe network of the direct expansion air conditioning unit completes the phase change cycle; E. Water-cooled direct expansion combined air conditioning units realize temperature and humidity control in the public areas of the station; F. Water-cooled direct expansion cabinet air-conditioning units are used to control the temperature and humidity in the station equipment area.

[0015] The beneficial effects of the present invention are as follows: Compared with the traditional design, the present invention eliminates the chilled water system, reduces the heat exchange links, and is simpler and more energy-efficient than the traditional design.

[0016] The present invention reduces the number of chillers and refrigerated water pumps in the chiller room, thereby greatly reducing the area of ​​the chiller room and saving civil engineering investment.

[0017] The present invention is simpler than the traditional solution, shortens the on-site air conditioning system debugging time, is simple to operate, and is convenient for subsequent operation, use and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of the principle of the present invention; in: 1 Cooling tower 2 Cooling water pump 3 water distributor 4 water collector 5 Constant pressure water supply device 61 Non-centralized end water-cooled direct expansion combined air conditioning unit 62 Centralized water-cooled direct expansion combined air conditioning unit 71 Non-centralized end water-cooled direct expansion cabinet air-conditioning unit 72 The first centralized water-cooled direct expansion cabinet air-conditioning unit 73 Second centralized water-cooled direct expansion cabinet air-conditioning unit 74 The third centralized water-cooled direct expansion cabinet air-conditioning unit. DETAILED DESCRIPTION

[0019] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments: like Figure 1 As shown, a water-cooled direct expansion air-conditioning system for subway includes a cooling tower water circulation pipeline network on the cooling tower side and a direct expansion air-conditioning unit pipeline network. The cooling tower water circulation pipeline network on the cooling tower side is a cooling tower side water circulation double parallel pipeline network. The direct expansion air-conditioning unit pipeline network is connected to the cooling tower water circulation pipeline network on the cooling tower side, and supplies air to the public area and equipment area of ​​the station.

[0020] The cooling tower water circulation pipe network on the cooling tower side includes a cooling tower 1, the output end of the cooling tower 1 is connected to the input end of the cooling water pump 2, and the input end of the cooling tower 1 is connected to the output end of the water collector 4 in the pipe network of the direct expansion air-conditioning unit.

[0021] The output end of the cooling water pump 2 is communicated with the input end of the water distributor 3 in the pipe network of the direct expansion air conditioning unit.

[0022] The pipe network of the direct expansion air-conditioning unit includes a water distributor 3 , which includes multiple output ends, and the output ends are respectively connected to the water-cooled direct expansion combined air-conditioning unit and the water-cooled direct expansion cabinet air-conditioning unit, and water is distributed in the water distributor 3 .

[0023] The output ends of the water-cooled direct expansion combined air-conditioning unit and the water-cooled direct expansion cabinet air-conditioning unit are connected to the input end of the water collector 4 , and water is collected in the water collector 4 .

[0024] The air processed by the water-cooled direct expansion combined air-conditioning unit is sent to the public area of ​​the station through the air duct, so as to control the temperature and humidity of the public area of ​​the station.

[0025] The air processed by the water-cooled direct expansion cabinet air-conditioning unit is sent to the station equipment area through the air duct to achieve the control of temperature and humidity in the station equipment area.

[0026] An input end of the water collector 4 is connected to an output end of a constant-pressure water replenishing device 5 , and water is replenished through the constant-pressure water replenishing device 5 .

[0027] Specifically, the water-cooled direct expansion combined air-conditioning unit includes a non-centralized end water-cooled direct expansion combined air-conditioning unit 61 and a centralized end water-cooled direct expansion combined air-conditioning unit 62. The input ends of the non-centralized end water-cooled direct expansion combined air-conditioning unit 61 and the centralized end water-cooled direct expansion combined air-conditioning unit 62 are respectively connected to the two output ends of the water distributor 3. At the same time, the output ends of the non-centralized end water-cooled direct expansion combined air-conditioning unit 61 and the centralized end water-cooled direct expansion combined air-conditioning unit 62 are respectively connected to the two input ends of the water collector 4.

[0028] Specifically, the water-cooled direct expansion cabinet air-conditioning unit includes a non-centralized end water-cooled direct expansion cabinet air-conditioning unit 71, a first centralized end water-cooled direct expansion cabinet air-conditioning unit 72, a second centralized end water-cooled direct expansion cabinet air-conditioning unit 73, and a third centralized end water-cooled direct expansion cabinet air-conditioning unit 74.

[0029] More specifically, the input ends of the non-centralized end water-cooled direct expansion cabinet air-conditioning unit 71, the first centralized end water-cooled direct expansion cabinet air-conditioning unit 72, the second centralized end water-cooled direct expansion cabinet air-conditioning unit 73, and the third centralized end water-cooled direct expansion cabinet air-conditioning unit 74 are connected in parallel and connected to an output end of the water distributor 3.

[0030] More specifically, the output ends of the non-centralized end water-cooled direct expansion cabinet air-conditioning unit 71, the first centralized end water-cooled direct expansion cabinet air-conditioning unit 72, the second centralized end water-cooled direct expansion cabinet air-conditioning unit 73, and the third centralized end water-cooled direct expansion cabinet air-conditioning unit 74 are connected in parallel and connected to an input end of the water collector 4.

[0031] Specifically, there are two cooling towers 1, which are arranged in parallel in the cooling tower water circulation network on the cooling tower side. A bypass pipe is arranged between the chassis of the two cooling towers 1 to ensure the stable operation of the cooling water system.

[0032] Specifically, there are two cooling water pumps 2, which are arranged in parallel in the cooling tower water circulation network on the cooling tower side, and the cooling water pumps 2 provide power for the cooling water circulation network on the cooling tower side.

[0033] Specifically, the water distributor 3 distributes multiple water ring branches, and the water collector 4 collects multiple water ring loops.

[0034] Specifically, the constant-pressure water replenishment device 5 is connected to the water collector 4 to replenish water loss during the operation of the pipeline network and maintain the stability of the system water pressure.

[0035] Specifically, a bypass pipe is provided between the water distributor 3 and the water collector 4 to adjust the flow rate and pressure to ensure the reliability and safety of the air conditioning water system.

[0036] More specifically, the cooling water circulation system on the cooling tower side forms cooling water supply and return water at 32°C and 37°C, providing a cold source for the water-cooled direct expansion combined air-conditioning unit and the water-cooled direct expansion cabinet air-conditioning unit.

[0037] Specifically, the water-cooled direct expansion combined air conditioning unit mainly serves the public area of ​​the station. The air processed by the water-cooled direct expansion combined air conditioning unit is sent to the public area of ​​the station through the air duct to control the temperature and humidity of the public area of ​​the station. The water-cooled direct expansion combined air conditioning unit includes a non-centralized end water-cooled direct expansion combined air conditioning unit 61 and a centralized end water-cooled direct expansion combined air conditioning unit 62.

[0038] Specifically, the water-cooled direct expansion cabinet air-conditioning unit mainly serves the station equipment area. The air treated by the water-cooled direct expansion cabinet air-conditioning unit is sent to the station equipment area through the air duct to achieve the control of the temperature and humidity of the station equipment area. The water-cooled direct expansion cabinet air-conditioning unit includes a non-centralized end water-cooled direct expansion cabinet air-conditioning unit 71, a first centralized end water-cooled direct expansion cabinet air-conditioning unit 72, a second centralized end water-cooled direct expansion cabinet air-conditioning unit 73, and a third centralized end water-cooled direct expansion cabinet air-conditioning unit 74. The non-centralized end water-cooled direct expansion cabinet air-conditioning unit 71 provides a cold source for the non-centralized end weak current room of the station, the first centralized end water-cooled direct expansion cabinet air-conditioning unit 72 provides a cold source for the centralized end personnel room of the station, the second centralized end water-cooled direct expansion cabinet air-conditioning unit 73 provides a cold source for the centralized end weak current room of the station, and the third centralized end water-cooled direct expansion cabinet air-conditioning unit 74 provides a cold source for the centralized end strong current room of the station, thereby achieving the temperature and humidity control of each area.

[0039] The direct expansion air conditioning unit has its own compressor. The liquid refrigerant in its refrigeration system directly evaporates in the evaporator coil to absorb heat from the air outside the coil and cool it, while the heat on the condensation side is brought to the outdoor atmosphere by the cooling water system.

[0040] A method for using a water-cooled direct expansion air conditioning system for a subway comprises the following steps: A. Cooling tower side cooling tower water circulation network for circulating water cooling and supply; B. Low-temperature circulating water and direct expansion air conditioning unit pipe network realize heat exchange; C. The pipe network of the direct expansion air conditioning unit produces cold air through heat exchange; D. The refrigerant in the pipe network of the direct expansion air conditioning unit completes the phase change cycle; E. Water-cooled direct expansion combined air conditioning units realize temperature and humidity control in the public areas of the station; F. Water-cooled direct expansion cabinet air-conditioning units are used to control the temperature and humidity in the station equipment area.

[0041] Specifically, in step A, the cooling tower water circulation network on the cooling tower side performs circulating water cooling and supply, and the specific process is as follows: A cooling tower 1 is used to cool the circulating water on the cooling tower side, and a cooling water pump 2 circulates the cooled water through a water distributor 3 to the water-cooled direct expansion combined air-conditioning unit and the water-cooled direct expansion cabinet air-conditioning unit.

[0042] Specifically, in step B, the low-temperature circulating water and the pipe network of the direct expansion air-conditioning unit realize heat exchange, and the specific process is as follows: The circulating water cools down the condensing side of the water-cooled direct expansion combined air-conditioning unit and the water-cooled direct expansion cabinet air-conditioning unit, and the heated cooling water circulates to the cooling tower 1 through the water collector 4.

[0043] Specifically, in step C, the pipe network of the direct expansion air conditioning unit generates cold air through heat exchange, and the specific process is as follows: The high-temperature outdoor air passes through the lower-temperature water-cooled direct expansion combined air-conditioning unit and the evaporation side of the water-cooled direct expansion cabinet air-conditioning unit, turning the high-temperature air into cold air and raising the temperature on the evaporation side.

[0044] Specifically, in step D, the refrigerant in the pipe network of the direct expansion air conditioning unit completes the phase change cycle, and the specific process is as follows: The cooling of the condensing side and the heating of the evaporating side of the water-cooled direct expansion combined air-conditioning unit and the water-cooled direct expansion cabinet air-conditioning unit complete the cycle through the phase change of the Freon system, and are powered by the built-in compressor of the unit.

[0045] Specifically, in step E, the water-cooled direct expansion combined air-conditioning unit realizes the control of temperature and humidity in the public area of ​​the station. The specific process is as follows: The water-cooled direct expansion combined air-conditioning unit delivers the cooled cold air through the air duct to the public areas of the station to cool the public areas.

[0046] Specifically, in step F, the water-cooled direct expansion cabinet air-conditioning unit realizes the control of temperature and humidity in the station equipment area. The specific process is as follows: The water-cooled direct expansion cabinet air-conditioning unit delivers the cooled cold air through the air duct to the station equipment area to cool the equipment area.

[0047] Compared with the traditional design, the present invention eliminates the chilled water system, reduces the heat exchange links, and is simpler and more energy-efficient than the traditional design.

[0048] The present invention reduces the number of chillers and refrigerated water pumps in the chiller room, thereby greatly reducing the area of ​​the chiller room and saving civil engineering investment.

[0049] The present invention is simpler than the traditional solution, shortens the on-site air conditioning system debugging time, is simple to operate, and is convenient for subsequent operation, use and management.

Claims

1. A water-cooled direct expansion air conditioning system for a subway, characterized in that: It includes a cooling tower water circulation pipeline network on the cooling tower side and a direct expansion air-conditioning unit pipeline network. The cooling tower water circulation pipeline network on the cooling tower side is a cooling tower side water circulation double parallel pipeline network. The direct expansion air-conditioning unit pipeline network is connected to the cooling tower water circulation pipeline network on the cooling tower side, and supplies air to the public area and equipment area of ​​the station.

2. A water-cooled direct expansion air conditioning system for subway according to claim 1, characterized in that: The cooling tower side cooling tower water circulation pipe network comprises a cooling tower (1), the output end of the cooling tower (1) is connected to the input end of a cooling water pump (2), and the input end of the cooling tower (1) is connected to the output end of a water collector (4) in the pipe network of a direct expansion air conditioning unit.

3. A water-cooled direct expansion air conditioning system for subway according to claim 2, characterized in that: The output end of the cooling water pump (2) is in communication with the input end of a water distributor (3) in the pipe network of the direct expansion air conditioning unit.

4. The water-cooled direct expansion air conditioning system for subway according to claim 1, characterized in that: The direct expansion air conditioning unit pipe network comprises a water distributor (3), the water distributor (3) comprises a plurality of output ends, and the output ends are respectively connected to the water-cooled direct expansion combined air conditioning unit and the water-cooled direct expansion cabinet air conditioning unit, and water is distributed in the water distributor (3).

5. A water-cooled direct expansion air conditioning system for subway according to claim 4, characterized in that: The output ends of the water-cooled direct expansion combined air conditioning unit and the water-cooled direct expansion cabinet air conditioning unit are connected to the input end of the water collector (4), and water is collected in the water collector (4).

6. A water-cooled direct expansion air conditioning system for subway according to claim 5, characterized in that: The air processed by the water-cooled direct expansion combined air-conditioning unit is sent to the public area of ​​the station through the air duct, so as to control the temperature and humidity of the public area of ​​the station.

7. The water-cooled direct expansion air conditioning system for subway according to claim 5, characterized in that: The air processed by the water-cooled direct expansion cabinet air-conditioning unit is sent to the station equipment area through the air duct to achieve the control of temperature and humidity in the station equipment area.

8. The water-cooled direct expansion air conditioning system for subway according to claim 5, characterized in that: An input end of the water collector (4) is in communication with an output end of the constant-pressure water replenishment device (5), and water is replenished through the constant-pressure water replenishment device (5).

9. A method for using a water-cooled direct expansion air conditioning system for a subway, characterized in that: The following steps are involved: A. Cooling tower side cooling tower water circulation network for circulating water cooling and supply; B. Low-temperature circulating water and direct expansion air conditioning unit pipe network realize heat exchange; C. The pipe network of the direct expansion air conditioning unit produces cold air through heat exchange; D. The refrigerant in the pipe network of the direct expansion air conditioning unit completes the phase change cycle; E. Water-cooled direct expansion combined air conditioning units realize temperature and humidity control in the public areas of the station; F. Water-cooled direct expansion cabinet air-conditioning units are used to control the temperature and humidity in the station equipment area.

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