CN210070100U - Defrosting type energy storage evaporative cooling air conditioning system - Google Patents

Abstract

The utility model discloses a defrosting type energy storage evaporative cooling air conditioning system, which comprises an indirect-direct evaporative cooling chiller unit, a mechanical refrigeration (heat pump) unit, a plate heat exchanger a, a plate heat exchanger b, and a plate heat exchanger c and energy storage device, the indirect-direct evaporative cooling chiller exchanges heat with plate heat exchanger a and mechanical refrigeration (heat pump) unit respectively, and the mechanical refrigeration (heat pump) unit exchanges heat with plate heat exchanger b and plate heat exchanger c respectively. For heat exchange, the plate heat exchanger c exchanges heat with the energy storage device. The air conditioning system of the utility model couples the antifreezing technology of indirect-direct evaporative cooling chiller refrigeration with the defrosting technology of heat pump heating; combines the mechanical refrigeration (heat pump) technology with the cold storage and heat storage technology, and makes full use of the peak-valley electricity price difference to reduce the unit operating costs.

Description

Defrost type energy storage evaporative cooling air conditioning system

technical field

The utility model belongs to the technical field of air conditioning equipment, in particular to a defrosting energy storage evaporative cooling air conditioning system.

Background technique

In recent years, the indoor cooling and cooling of some industrial buildings has become a hot spot in the refrigeration and air conditioning industry, such as textile factories, production workshops, and data centers. In particular, the rapid growth of data center construction has led to more and more equipment in the computer room, providing a constant temperature and humidity cooling environment for the data center. The power consumption of the data center will greatly increase, and the cooling system, power distribution system, UPS and generator will all increase proportionally, which will bring a major challenge to the energy consumption of the data center.

In the data center, only the traditional mechanical cooling chiller is used, which consumes a lot of electricity and has high operation and maintenance costs. As the design water temperature of the data center increases, the outlet water temperature of the indirect-direct evaporative cooling chiller to produce high-temperature cold water meets the design requirements for part of the time, and the power consumption is smaller and the operation and maintenance cost is lower. However, the high-temperature cold water produced only by indirect-direct evaporative cooling chillers is subject to meteorological conditions. In summer in medium and high humidity areas, or continuous rainy days in dry areas, traditional mechanical refrigeration chillers are still required to produce high-temperature cold water; In the severe cold weather in winter, the traditional evaporative cooling chiller is easy to freeze, and it is necessary to fully consider anti-freezing measures when it is used in fields such as data centers that require cooling in winter. In winter, in the living area without central heating near the computer room of the data center, the heat pump heating method can be used, but when the unit is running at low temperature, the frost on the outdoor unit will affect the heating capacity and heating coefficient of the unit. The cost of frost and defrosting accounts for the total operation. 10% of energy consumption.

Utility model content

The purpose of the utility model is to provide a defrosting type energy storage evaporative cooling air conditioning system to solve the problem of large energy consumption of the cooling system of the data center.

The technical scheme adopted by the utility model is: a defrosting type energy storage evaporative cooling air conditioning system, comprising an indirect-direct evaporative cooling chiller unit, a mechanical refrigeration (heat pump) unit, a plate heat exchanger a, a plate heat exchanger b, The plate heat exchanger c and the energy storage device, the indirect-direct evaporative cooling chiller exchange heat with the plate heat exchanger a and the mechanical refrigeration (heat pump) unit respectively, and the mechanical refrigeration (heat pump) unit and the plate heat exchanger b and the plate heat exchanger respectively. The heat exchanger c performs heat exchange, and the plate heat exchanger c performs heat exchange with the energy storage device.

The utility model is also characterized in that,

The middle part of the indirect-direct evaporative cooling chiller is set as a packed tower, the middle of the packed tower is provided with packing, a heat exchange coil b is arranged above the packing in the packed tower, and a water distributor b is arranged above the heat exchange coil b. A water baffle is arranged above the water device b, and a fan b is installed on the upper end of the water baffle.

The left and right sides of the packed tower are provided with air inlet, coarse filter, heat exchange coil a, and plate-and-tube indirect evaporative cooler in sequence according to the air intake direction. A fan a is arranged above the a, the water distributor a is connected to one end of the conduit one, the other end of the conduit one is connected to the heat exchange coil a, and the conduit one is provided with a valve a, and the bottom of the plate-tube indirect evaporative cooler is provided with a water tank First, a water pump a is arranged in the first water tank, the water pump a is connected with a conduit two, and a valve b and a valve c are arranged on the conduit two.

The bottom of the packed tower is provided with a water tank 2, the water tank 2 is provided with a water pump b, and the water pump b is connected with a conduit 3. The conduit 3 passes through the plate heat exchanger a and the end of the conduit 3 is connected to the water distributor b. The position of the heat exchanger a is provided with a valve d and a valve e, the plate heat exchanger a is also connected with a conduit four, the end of the conduit four is connected to the plate heat exchanger b, and the conduit four is respectively provided with valve f, valve g and valve h.

The mechanical refrigeration (heat pump) unit includes a shell-and-tube heat exchanger, a throttle valve, a compressor and a four-way valve. One end of the shell-and-tube heat exchanger is connected to the upper end of the heat exchange coil a through the conduit five, and the conduit five is provided with There is a throttle valve, the other end of the shell-and-tube heat exchanger is connected to the lower end of the heat exchange coil a through a conduit six, and the conduit six passes through the compressor, and a four-way valve is arranged on the conduit six.

The shell-and-tube heat exchanger is connected with the plate heat exchanger b and the plate heat exchanger c through the conduit seven, the conduit seven is provided with the valve k and the valve m, the plate heat exchanger c is connected to the energy storage device through the conduit eight, and the conduit eight is on the A valve n and a valve s are provided.

The top of the packing tower is provided with an air outlet, and the air outlet is connected to the outside.

A bypass ventilation valve is arranged between the heat exchange coil a and the indirect plate-and-tube evaporative cooler, and the indirect plate-and-tube evaporative cooler communicates with the packed tower.

The lower part of the plate-and-tube indirect evaporative cooler is provided with a secondary air inlet.

The beneficial effects of the air conditioning system of the present utility model are:

1. The air-conditioning system of the present utility model has complete functions, energy saving and high efficiency. High-temperature cold water and low-temperature cold water can be prepared at the same time in transition season and summer, which can be used for cooling and dehumidification; in winter, it can supply cooling and heating at the same time, and defrost free of charge; the peak and valley can be used. The difference in electricity price is used to store cold and heat, saving operating costs.

2. When the air-conditioning system of the present utility model operates the indirect-direct evaporative cooling chiller in the transitional season and summer, the two-stage indirect evaporative cooling section reduces the dry and wet bulb temperature of the air entering the packed tower, reduces the condensation temperature, and increases the evaporation temperature of the evaporator , prolong the time of evaporative cooling operation; adopt the unit form that combines internal and external cooling to strengthen heat transfer, the plate-tube indirect evaporative cooler has a wider cross-sectional flow channel, the water film on the outside of the plate-tube tube wall is more uniform, and the tube resistance is smaller. The polymer material has enhanced hydrophilicity, significant anti-fouling effect, enhanced heat and mass transfer effect, and prolongs the service life of the plate-tube indirect evaporative cooler.

3. In the air-conditioning system of the present utility model, all heat-exchange internal circulations (internal circulation refers to: terminal supply and return water circulation) adopt closed circulation, and internal circulation and external circulation (external circulation refers to: the medium used for cooling the internal circulation); The plate heat exchanger is used for heat exchange in the internal circulation, which effectively avoids problems such as clogging of the indoor end in the internal circulation.

4. The cold water between the shell-and-tube heat exchanger and the plate heat exchangers b and c in the air conditioning system of the present invention can be adjusted through the opening degree of the valve to adjust the flow distribution of the 7°C cold water produced, and pass through the plate heat exchanger. b, c, respectively prepare the high temperature cold water for internal circulation cooling and the low temperature cold water for cooling and dehumidification.

5. The air-conditioning system of the utility model can supply cooling and heating at the same time in winter, couples the anti-freezing technology and the defrosting technology of heat pump heating, and fully utilizes the anti-freezing characteristics of the ethylene glycol refrigerant to realize heat transfer and efficient utilization, and realize free Defrost improves the heating effect and operating life of the unit.

6. The air conditioning system of the present utility model can fully utilize the peak-valley electric difference to store cold and heat, thereby saving the operating cost of the mechanical refrigeration (heat pump) unit.

7. The air conditioning system of the present utility model integrates the mechanical refrigeration chiller, the indirect-direct evaporative cooling chiller, the plate heat exchanger, and the energy storage device, which reduces the energy consumption of the transmission and distribution system and facilitates transportation, installation and maintenance.

Description of drawings

Fig. 1 is the structural representation of a kind of defrosting type energy storage evaporative cooling air conditioning system of the present utility model;

Fig. 2 is a schematic diagram of the winter operation flow chart of a defrosting type energy storage evaporative cooling air conditioning system of the present invention;

3 is a schematic diagram of the transition season operation flow diagram of a defrosting type energy storage evaporative cooling air conditioning system of the present invention;

4 is a schematic diagram of the summer operation process of a defrosting energy storage evaporative cooling air conditioning system of the present invention;

5 is a schematic diagram of the installation position of a defrost-type energy-storage evaporative cooling air-conditioning system of the present invention;

6 is a schematic diagram of a heat pump heating process of a defrosting energy storage evaporative cooling air conditioning system of the present invention;

7 is a schematic diagram of the mechanical refrigeration process of a defrost-type energy storage evaporative cooling air conditioning system of the present invention;

Fig. 8 is a schematic diagram of the indirect-direct evaporative cooling chiller in transition season and summer operation of a defrosting energy storage evaporative cooling air conditioning system of the present invention.

In the figure, 1. Air inlet, 2. Coarse efficiency filter, 3. Heat exchange coil a, 4. Valve a, 5. Valve b, 6. Plate tube indirect evaporative cooler, 7. Water distributor a, 8 .fan a, 9. secondary air inlet, 10. water pump a, 11. valve c, 12. bypass ventilation valve, 13. packing tower, 14. fan b, 15. water baffle, 16. water distributor b , 17. Heat exchange coil b, 18. Packing, 19. Water pump b, 20. Valve d, 21. Valve e, 22. Plate heat exchanger a, 23. Valve f, 24. Valve g, 25. Valve h , 26. Throttle valve, 27. Shell and tube heat exchanger, 28. Four-way valve, 29. Compressor, 30. Plate heat exchanger b, 31. Valve k, 32. Valve m, 33. Plate heat exchange Device c, 34. Valve n, 35. Valve s, 36. Accumulator.

Detailed ways

The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

The utility model provides a defrosting type energy storage evaporative cooling air conditioning system, as shown in FIG. 1 , including an indirect-direct evaporative cooling chiller unit, a mechanical refrigeration (heat pump) unit, a plate heat exchanger a22, and a plate heat exchanger b30 , plate heat exchanger c33 and energy storage device 36, the indirect-direct evaporative cooling chiller exchanges heat with the plate heat exchanger a22 and the mechanical refrigeration (heat pump) unit respectively, and the mechanical refrigeration (heat pump) unit and the plate heat exchanger b30 respectively. , the plate heat exchanger c33 exchanges heat, and the plate heat exchanger c33 exchanges heat with the energy storage device 36;

The middle of the indirect-direct evaporative cooling chiller is set as a packed tower 13, a packing 18 is arranged in the middle of the packed tower 13, a heat exchange coil b17 is arranged above the packing 18 in the packed tower 13, and a cloth is arranged above the heat exchange coil b17. The water device b16, the top of the water distributor b16 is provided with a water blocking plate 15, the upper end of the water blocking plate 15 is installed with a fan b14, and the top of the packing tower 13 is provided with an air outlet, and the air outlet is connected to the outdoor;

The left and right sides of the packed tower 13 have the same structure. The left and right sides of the packed tower 13 are sequentially provided with an air inlet 1, a coarse filter 2, a heat exchange coil a3, and a plate-tube indirect evaporative cooler 6 according to the air inlet direction. A bypass ventilation valve 12 is arranged between the coil a3 and the indirect plate-and-tube evaporative cooler 6, the plate-and-tube indirect evaporative cooler 6 communicates with the packed tower 13, and the lower part of the plate-and-tube indirect evaporative cooler 6 is provided with a secondary air inlet 9 , a water distributor a7 is arranged above the plate-and-tube indirect evaporative cooler 6, a fan a8 is arranged above the water distributor a7, the water distributor a7 is connected to one end of the conduit one, and the other end of the conduit one is connected to the heat exchange coil a3, And the first conduit is provided with a valve a4, the bottom of the plate-and-tube indirect evaporative cooler 6 is provided with a water tank one, a water pump a10 is arranged in the first water tank, the water pump a10 is connected with a conduit two, and the conduit two is provided with a valve b5 and a valve c11;

The bottom of the packed tower 13 is provided with a water tank 2, the water tank 2 is provided with a water pump b19, and the water pump b19 is connected with a conduit three, the conduit three passes through the plate heat exchanger a22 and the end of the conduit three is connected to the water distributor b16, the conduit three is on the near-plate type. The position of the heat exchanger a22 is provided with a valve d20 and a valve e21, the plate heat exchanger a22 is also connected with a conduit four, the end of the conduit four is connected to the plate heat exchanger b30, and the conduit four is respectively provided with a valve f23, a valve g24 and valve h25;

The mechanical refrigeration (heat pump) unit includes a shell and tube heat exchanger 27, a throttle valve 26, a compressor 29 and a four-way valve 28. One end of the shell and tube heat exchanger 27 is connected to the upper end of the heat exchange coil a17 through a conduit five, And a throttle valve 26 is provided on the conduit five, the other end of the shell-and-tube heat exchanger 27 is connected to the lower end of the heat exchange coil a17 through the conduit six, and the conduit six passes through the compressor 29, and the conduit six is provided with a four-way valve 28. ;

The shell-and-tube heat exchanger 27 in the mechanical refrigeration (heat pump) unit is connected to the plate heat exchanger b30 and the plate heat exchanger c33 through the conduit seven for heat exchange. The conduit seven is provided with a valve k31 and a valve m32, and the plate heat exchange The device c33 is connected to the energy storage device 36 through the eighth conduit, and the eighth conduit is provided with a valve n34 and a valve s35.

The ethylene glycol solution is passed into the heat exchange coil a3 in winter, and the circulating water is passed into the fresh air for pre-cooling in summer and transitional seasons;

The water distributor a7, the fan a8, the secondary air inlet 9, the water pump a10, the valve c11, and the bypass ventilation valve 12 together form the plate-and-tube indirect evaporative cooling section. disable;

The heat exchange coil b17 acts as a condenser to release heat in the transition season and summer, and absorbs heat as an evaporator in winter;

The shell-and-tube heat exchanger 27 is used as an evaporator to produce low-temperature cold water in transition seasons and summer, and as a condenser in winter to produce low-temperature hot water; the energy storage device 36 stores heat at night in winter and cools at night in summer.

Plate tube indirect evaporative cooler 6 works only in summer and transition seasons, where:

Primary air flow: The outdoor fresh air is used as primary air, which is pre-cooled by the heat exchange coil a3 on the outside of the unit, and then further cooled by moisture in the tube of the plate-and-tube indirect evaporative cooler 6, and then enters the packed tower 13 and circulates spray. The heat and mass exchange occurs in the shower;

Secondary air flow: Part of the outdoor fresh air after wet cooling by the heat exchange coil a3, etc. enters the wet passage outside the plate and tube indirect evaporative cooler 6 through the bypass valve 12, and then enters the outdoor fresh air through the secondary air inlet 9. The fresh air is mixed and enters the wet channel on the outer wall of the tube to exchange heat and mass with the circulating spray water. After cooling the primary air on the inner wall of the tube, it is discharged to the environment by the upper fan a8;

Circulating water process: The cooled circulating spray water falls into the water tank, firstly passes into the heat exchange coil a3 to pre-cool the outdoor fresh air, and then returns to the wet channel of the plate-and-tube indirect evaporative cooler 6 on the outside of the tube for spray cooling. cycle.

The working modes of a defrosting energy storage evaporative cooling air conditioning system provided by the utility model include a winter operation mode, a transitional season operation mode and a summer operation mode, and the specific operation modes are as follows:

(1) Winter operating mode:

As shown in Figure 2, in the indirect-direct evaporative cooling chiller, only valve a4, valve b5 and fan b14 are opened, and ethylene glycol is used for natural cooling for cooling. The system of mechanical refrigeration (heat pump) unit only opens valve m32 and closes valve during the day. K31, at night, the valve n34 and valve s35 in the energy storage device 36 should be opened to operate the heating mode. After the heat exchange coil a3 preheats the outdoor fresh air, the ethylene glycol solution cooled by the outdoor fresh air enters the indoor end for cooling; as shown in Figure 6, the valve plate of the four-way valve 28 in the mechanical refrigeration (heat pump) unit is switched to In the heating state, the heat exchange coil b17 in the packed tower 13 acts as an evaporator to absorb the air heat preheated by the ethylene glycol solution. After the refrigerant in the heat exchange coil b17 is vaporized, it enters the shell and tube type through the throttle valve 26 The heat exchanger 27 condenses and releases heat, the heated water in the shell and tube heat exchanger 27 passes into the plate heat exchanger c33 to heat the circulating water on the other side, and the heated low-temperature hot water enters the living area for heating, and the machinery is operated at night. When a refrigeration (heat pump) unit is used, a part of the heated low-temperature hot water is passed into the energy storage device 36, which can be used for heating in the living area during the day.

(2) Transition season operation mode:

As shown in Figure 3 and Figure 8, the high temperature cold water is produced by the indirect-direct evaporative cooling chiller combined with the mechanical refrigeration (heat pump) unit, and the refrigerant condensed in the heat exchange coil b17 is produced by the indirect-direct evaporative cooling chiller The specific method is as follows: In the indirect-direct evaporative cooling chiller, only valve a4 and valve b5 are closed, and the rest of the equipment is opened. At the same time, the bypass ventilation valve 12 is opened. The valves of the transmission and distribution system only open valve d20, valve f23, Valve h25, close valve e21, valve f24, mechanical refrigeration (heat pump) system only opens valve k31 and valve m32 during the day, and also needs to open valve n34 and valve s35 in the energy storage device 36 at night, and the indoor end return water first enters the plate heat exchanger After a22 is pre-cooled by the high-temperature cold water of the indirect-direct evaporative cooling chiller, it enters the plate heat exchanger and b30 is cooled to the design high-temperature cold water temperature, and then enters the indoor end for cooling;

As shown in Figure 7, the mechanically refrigerated heat exchange coil b17 is used as a condenser to be cooled by spray water outside the tube and air that has undergone two-stage indirect precooling (evaporative condensation). The tubular heat exchanger 27 acts as an evaporator to produce 7°C cold water, a small part of the 7°C cold water flows into the plate heat exchanger b30 to cool the circulating water on the other side to obtain high temperature cold water, and most of the 7°C cold water flows into the plate heat exchanger c33 for cooling The circulating water on the other side produces low-temperature cold water (below the dew point temperature), and the low-temperature cold water (below the dew point temperature) produced by the plate heat exchanger c33 can be used for dehumidification. At night, the low temperature cold water produced by the plate heat exchanger c33 can be used. Passing into the energy storage device 36, it can be used for cooling and dehumidification during the day;

After the fresh air is wet-cooled by the heat exchange coil a3, a part enters the tube and is wet-cooled by the circulating water spray and air outside the tube, and a part enters the wet channel outside the tube of the indirect evaporative cooler 6 and the outdoor through the bypass valve 12. After the air is mixed, it will be used as secondary air and the circulating water will exchange heat and mass, and the circulating water with a temperature lower than the wet bulb temperature of the outdoor air can be produced. 6. After spraying on the top, the outdoor fresh air after two-stage wet cooling enters the packed tower 13 for heat and mass exchange. The obtained high-temperature cold water first passes into the plate heat exchanger a22, and then enters the indirect-direct evaporative cooling chiller for spraying. drenched.

(3) Summer operation mode:

As shown in Figure 4, the high-temperature cold water is produced by the mechanical refrigeration chiller, and the cooling water when the heat exchange coil b17 is condensed is produced by the indirect-direct evaporative cooling chiller. Specifically: In the indirect-direct evaporative cooling chiller, only Close valve a4, valve b5, all other equipment are open, and open bypass valve 12 at the same time, the valves of the transmission and distribution system only open valve e21, valve g24, valve h25, close valve d20, valve f23, mechanical refrigeration (heat pump) system only during the day Open the valve k31 and the valve m32, and also open the valve n34 and s35 of the energy storage device 36 at night. The indoor end return water enters the plate heat exchanger b30 and is cooled to the design high temperature cold water temperature, and then enters the indoor end for cooling;

The mechanically refrigerated heat exchange coil b17 is used as a condenser to be cooled by the spray water outside the tube and the air that has undergone two-stage indirect precooling (evaporative condensation), and the gaseous refrigerant releases heat and liquefies in the tube, and the shell-and-tube heat exchanger 27 As an evaporator to produce 7°C cold water, a small part of the 7°C cold water flows into the plate heat exchanger b30 to cool the circulating water on the other side to obtain high-temperature cold water, and most of the 7°C cold water flows into the plate heat exchanger c33 to cool the circulating water on the other side Low temperature cold water (below the dew point temperature) is prepared, and the low temperature cold water (below the dew point temperature) prepared by the plate heat exchanger c33 can be used for dehumidification. At night, the low temperature cold water prepared by the plate heat exchanger c33 can be passed into the energy storage device 36 , can be used for cooling and dehumidification during the day;

After the fresh air is wet-cooled by the heat exchange coil a3, a part enters the tube and is wet-cooled by the circulating water spray and air outside the tube, and a part enters the wet channel outside the tube of the indirect evaporative cooler 6 and the outdoor through the bypass valve 12. After the air is mixed, it will be used as secondary air and the circulating water will exchange heat and mass, and the circulating water with a temperature lower than the wet bulb temperature of the outdoor air can be produced. 6. After spraying on the top, the outdoor fresh air after two-stage wet cooling enters the packed tower 13 for heat and mass exchange. The obtained high-temperature cold water first passes into the plate heat exchanger a22, and then enters the indirect-direct evaporative cooling chiller for spraying. drenched.

The air conditioning system of the utility model couples the antifreeze technology of indirect-direct evaporative cooling chiller refrigeration with the defrosting technology of heat pump heating; combines the mechanical refrigeration (heat pump) technology with the cold storage and heat storage technology, and makes full use of the peak-valley electricity price difference to reduce The unit operation cost; the integrated unit form reduces the energy consumption of the transmission and distribution system, and is more convenient for transportation, installation, operation and maintenance; it is foreseeable that the invention has broad prospects for application in data centers.

Claims (8)

1. a defrosting type energy storage evaporative cooling air conditioning system, is characterized in that, comprises indirect-direct evaporative cooling chiller, mechanical refrigeration unit or heat pump unit, plate heat exchanger a (22), plate heat exchanger b (30 ), a plate heat exchanger c (33) and an energy storage device (36), the indirect-direct evaporative cooling chillers exchange heat with the plate heat exchanger a (22), a mechanical refrigeration unit or a heat pump unit respectively, and the mechanical refrigeration The unit or the heat pump unit exchanges heat with the plate heat exchanger b (30) and the plate heat exchanger c (33) respectively, and the plate heat exchanger c (33) exchanges heat with the energy storage device (36). 2. A defrost-type energy storage evaporative cooling air conditioning system according to claim 1, characterized in that, the middle of the indirect-direct evaporative cooling chiller is set as a packed tower (13), and the packed tower (13) ) is provided with a packing (18) in the middle, and a heat exchange coil b (17) is arranged above the packing (18) in the packing tower (13), and a water distribution is arranged above the heat exchange coil b (17). device b (16), a water baffle (15) is arranged above the water distributor b (16), and a fan b (14) is installed on the upper end of the water baffle (15); the packing tower (13) The top of the device is provided with an air outlet, and the air outlet is connected to the outside. 3. A defrosting type energy storage evaporative cooling air conditioning system according to claim 2, characterized in that, the left and right sides of the packed tower (13) are sequentially provided with air inlets (1), coarse-efficiency filters according to the air inlet direction (2), heat exchange coil a (3), plate-and-tube indirect evaporative cooler (6), a water distributor a (7) is arranged above the plate-and-tube indirect evaporative cooler (6). A fan a (8) is arranged above the water device a (7), the water distributor a (7) is connected to one end of the conduit one, the other end of the conduit one is connected to the heat exchange coil a (3), and the conduit A valve a (4) is arranged on the upper part, a water tank 1 is arranged at the bottom of the plate-and-tube indirect evaporative cooler (6), and a water pump a (10) is arranged in the water tank 1, and the water pump a (10) is connected with a The second conduit is provided with a valve b (5) and a valve c (11). 4. A defrosting type energy storage evaporative cooling air conditioning system as claimed in claim 2, wherein the bottom of the packed tower (13) is provided with a second water tank, and the second water tank is provided with a water pump b (19 ), the water pump b (19) is connected with a conduit three, the conduit three passes through the plate heat exchanger a (22) and the end of the conduit three is connected to the water distributor b (16), the conduit three is close to the plate type exchange The position of the heat exchanger a (22) is provided with a valve d (20) and a valve e (21), the plate heat exchanger a (22) is also connected with a conduit four, and the end of the conduit four is connected to the plate heat exchanger A valve b (30) is installed, and a valve f (23), a valve g (24) and a valve h (25) are respectively arranged on the fourth conduit. 5. A defrosting type energy storage evaporative cooling air conditioning system according to claim 1, wherein the mechanical refrigeration unit or the heat pump unit comprises a shell and tube heat exchanger (27), a throttle valve (26) , compressor (29) and four-way valve (28), one end of the shell-and-tube heat exchanger (27) is connected to the upper end of the heat exchange coil a (3) through conduit five, and conduit five is provided with a throttle The valve (26), the other end of the shell and tube heat exchanger (27) is connected to the lower end of the heat exchange coil a (3) through the conduit six, and the conduit six passes through the compressor (29), and the conduit six is provided on the There is a four-way valve (28). 6. A defrosting type energy storage evaporative cooling air conditioning system according to claim 5, characterized in that, the shell and tube heat exchanger (27) communicates with the plate heat exchanger b (30) and the plate heat exchanger (27) through the conduit seven. The heat exchanger c (33) is connected, the conduit seven is provided with a valve k (31) and a valve m (32), and the plate heat exchanger c (33) is connected to the energy storage device (36) through the conduit eight, so The conduit eight is provided with a valve n (34) and a valve s (35). 7. A defrosting type energy storage evaporative cooling air conditioning system according to claim 3, characterized in that, a bypass is provided between the heat exchange coil a (3) and the plate-and-tube indirect evaporative cooler (6). A ventilation valve (12), the plate-and-tube indirect evaporative cooler (6) is communicated with the packed tower (13). 8 . The defrosting energy storage evaporative cooling air conditioning system according to claim 3 , wherein the lower part of the plate-and-tube indirect evaporative cooler ( 6 ) is provided with a secondary air inlet ( 9 ). 9 .

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