CN217441863U

CN217441863U - Evaporative cooling composite air conditioning system with precooling function

Info

Publication number: CN217441863U
Application number: CN202221282413.XU
Authority: CN
Inventors: 蔡守亮; 张琛
Original assignee: Climaveneta Chatunion Refrigeration Equipment Shanghai Co ltd
Current assignee: Climaveneta Chatunion Refrigeration Equipment Shanghai Co ltd
Priority date: 2022-05-26
Filing date: 2022-05-26
Publication date: 2022-09-16
Anticipated expiration: 2032-05-26

Abstract

The utility model discloses an evaporative cooling composite air conditioning system with precooling, which comprises a condenser, wherein the inlet of the condenser is connected with a host unit A interface, and the outlet of the condenser is connected with a host unit B interface; the other end of the interface of the main unit B is connected with a liquid storage device, the other end of the liquid storage device is respectively connected with a refrigerant pump and a bypass valve, and the other ends of the refrigerant pump and the bypass valve are jointly connected with the interface of the main unit C; one end of the interface of the host unit A, which is far away from the condenser access port, is respectively connected with a compressor and a bypass valve, and the other ends of the compressor and the bypass valve are jointly connected with an interface of a host unit D; the evaporative cooling composite air conditioning system with precooling, which overcomes the existing defects, can make full use of an outdoor natural cold source and improve the condensation efficiency.

Description

Evaporative cooling composite air conditioning system with precooling function

Technical Field

The utility model relates to a take compound air conditioning system of evaporative cooling of precooling.

Background

With the development of network technology, the scale and the number of data centers are rapidly developed and become power consumers of the information society. In order to ensure efficient and reliable operation of the data center, heat generated by the servers of the data center during operation needs to be rapidly exhausted. According to statistics, the electricity consumption of the modern social data center accounts for 5% of the total electricity of the whole society. The IDC (internet data center) industry research report showed that data centers scale to 714.5 billion dollars by 2016. In 2018, the electricity consumption of the Chinese data center exceeds 1200 hundred million kilowatts, and exceeds the electricity generation of three gorges hydropower stations and the power stations of the Gezhou dam for one year. In order to reduce the energy consumption of the data center and reasonably configure social resources, a refrigeration system of the data center needs to be optimized, wherein a natural cold source is a preferred mode for solving the problem of high energy consumption of a data center machine room at present, and the natural cold source is renewable energy. The utilization of outdoor natural cold sources has been the focus of researchers and engineers in the industry, and engineering research is being conducted in different forms, such as fresh air systems, gas-gas heat exchange systems, and gas-water heat exchange systems. In addition, composite air conditioners comprising various heat pipes, such as gravity-type separated heat pipes, liquid pump-powered separated heat pipes, and air pump-powered separated heat pipes, have been proposed and used. However, most of the above solutions are limited to be used in small data center rooms, and are not well used in large data centers.

In order to achieve the purpose that the PUE (power supply use efficiency) of a large data center is smaller than 1.3, an indirect evaporative cooling technology, an air pump driven heat pipe technology and a liquid pump driven heat pipe technology are comprehensively utilized, and a precooling device is arranged on the indirect evaporative cooling device, so that the supercooling effect in summer can be achieved, the system efficiency is improved, and the problem of freezing of a cooling tower in winter is solved, and therefore the evaporative cooling composite air conditioning system with precooling is provided for solving the problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome current defect and a take compound air conditioning system of evaporative cooling of precooling that provides can the outdoor natural cold source of make full use of, improves condensation efficiency.

The technical scheme for realizing the purpose is as follows: an evaporative cooling composite air conditioning system with precooling comprises a condenser, wherein an inlet of the condenser is connected with an interface A of a host unit, and an outlet of the condenser is connected with an interface B of the host unit; the other end of the interface of the main unit B is connected with a liquid storage device, the other end of the liquid storage device is respectively connected with a refrigerant pump and a bypass valve, and the other ends of the refrigerant pump and the bypass valve are jointly connected with the interface of the main unit C;

one end of the interface of the host unit A, which is far away from the condenser access port, is respectively connected with a compressor and a bypass valve, and the other ends of the compressor and the bypass valve are jointly connected with an interface of a host unit D;

one end of the host unit C interface is respectively connected with a tail end evaporator and a water side evaporator, and the lower end of the tail end evaporator is connected with a throttling device; the lower end of the water side evaporator is connected with a water valve, and the throttling device and the lower end of the water valve are connected to a D interface of the host unit together.

Preferably, the system further comprises a water pump, one end of the water pump is connected with the condenser, the other end of the water pump is connected with the precooling heat exchanger, and the precooling heat exchanger is connected with the evaporative cooling heat exchanger.

Preferably, a first sight glass and a first filter are connected between the interface of the host unit B and the reservoir.

Preferably, there are two precooling heat exchangers respectively located at two sides of the evaporative cooling heat exchanger.

Preferably, a second sight glass and a second filter are disposed between the accumulator and the refrigerant pump.

Preferably, the number of the compressors is plural, and the plural compressors are connected in parallel.

Preferably, the throttling device is an electronic expansion valve.

Preferably, the condenser is a stainless steel tube.

The utility model has the advantages that: the dew point evaporative cooling heat exchanger is used for exchanging heat with outdoor air, prepared cold water with the temperature lower than that of a wet bulb is provided to the evaporative condensation tower, the more efficient condensation of the host unit is realized, the host unit can be a conventional vapor compression refrigeration system or a system with a natural cooling function, the system can fully utilize an outdoor natural cold source, and the unit directly conveys a refrigerant to the tail end evaporator for refrigeration, so that the dew point evaporative cooling heat exchanger is suitable for data centers to carry out annual energy cooling.

Drawings

Fig. 1 is a front view of the present invention;

fig. 2 is a detailed view of the present invention.

In the figure: 1. a water pump; 2. a throttling device; 3. a terminal evaporator; 4. a condenser; 5. a precooling heat exchanger; 6. an evaporative cooling heat exchanger; 7. a compressor; 8. a first liquid sight glass; 9. a first filter; 10. a reservoir; 11. a bypass valve; 12. a refrigerant pump; 13. a bypass valve; 14. a water side evaporator; 15. a water valve.

Detailed Description

The technical solution of the present invention will be clearly and completely described with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to 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 "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance.

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1-2, an evaporative cooling composite air conditioning system with precooling comprises a condenser 4, wherein an inlet of the condenser 4 is connected with an interface of a host unit a, and an outlet of the condenser 4 is connected with an interface of a host unit B; the other end of the interface of the main unit B is connected with an accumulator 10, the other end of the accumulator 10 is respectively connected with a refrigerant pump 12 and a bypass valve 11, and the other ends of the refrigerant pump 12 and the bypass valve 11 are commonly connected with the interface of the main unit C; one end of the interface of the host unit A, which is far away from the access port of the condenser 4, is respectively connected with the compressor 7 and the bypass valve 13, and the other ends of the compressor 7 and the bypass valve 13 are jointly connected with the interface of the host unit D; one end of the interface C of the host unit is respectively connected with the tail end evaporator 3 and the water side evaporator 14, and the lower end of the tail end evaporator 3 is connected with the throttling device 2; the lower end of the water side evaporator 14 is connected with a water valve 15, and the lower ends of the throttling device 2 and the water valve 15 are connected to a host unit D interface together. The water pump 1 is further included, one end of the water pump 1 is connected with the condenser 4, the other end of the water pump 1 is connected with the precooling heat exchanger 5, and the precooling heat exchanger 5 is connected with the evaporative cooling heat exchanger 6. A first sight glass 8 and a first filter 9 are connected between the interface of the main unit B and the reservoir 10. The number of the precooling heat exchangers 5 is two, and the precooling heat exchangers are respectively positioned at two sides of the evaporative cooling heat exchanger 6. A second liquid scope and a second filter are provided between the accumulator 10 and the refrigerant pump 12. The number of the compressors 7 is plural, and the plural compressors 7 are connected in parallel. The throttle 2 is an electronic expansion valve. The condenser 4 is a stainless steel tube. When no natural cold source available outdoors exists, the refrigeration cycle mode is operated, the bypass valve 11 is opened, and the bypass valve 13 is closed; a circulation loop is formed by the compressor 7, the condenser 4, the liquid storage device 10, the bypass valve 11, the throttling device 2 and the water side evaporator 14, at the moment, the refrigerant pump 12 is closed, the precooling heat exchanger 5 and the water pump 1 form a condensation loop, and a tail end loop formed by the water side evaporator 14, the water pump 1, the water valve 15 and the tail end evaporator 3 refrigerates data centers. The low-temperature chilled water at the tail end side evaporates and absorbs heat in the tail end evaporator 3, such as 15-DEG C low-temperature chilled water, after refrigeration is finished and the low-temperature chilled water leaves the tail end evaporator 3, the high-temperature chilled water is changed into high-temperature chilled water, the high-temperature chilled water enters the water side evaporator for heat exchange, such as 20-DEG C high-temperature chilled water, and is cooled into low-temperature chilled water again by the host unit, wherein liquid (gas-liquid mixed state) refrigerant enters the water side evaporator 14 to absorb heat of the high-temperature chilled water, the chilled water is reduced in temperature to 15-DEG C low-temperature chilled water, the low-temperature chilled water is changed into gaseous refrigerant, the gaseous refrigerant is discharged by the compressor 7 and enters the condenser 4 to be cooled into liquid working medium, the liquid working medium enters the liquid reservoir 10 to be stored, and directly enters the throttling device 2 for throttling and pressure reduction through the opened bypass valve 11 to enter the water side evaporator 14 again for evaporation and heat absorption, the refrigeration purpose is achieved, and circulation is formed. The low-temperature cooling water which is cooled by the outdoor air in the evaporative cooling heat exchanger 6 is conveyed to the condenser 4 through the action of the water pump 1 to realize the condensation of the refrigerant of the main unit at 25 ℃ and the temperature of the low-temperature cooling water is increased at 30 ℃, the low-temperature cooling water enters the precooling heat exchanger 5 preferentially to perform a precooling action on the outdoor air at 35 ℃ for example, the temperature of the water entering the precooling heat exchanger 5 is 30 ℃, the air is precooled at one time at 32 ℃ for example, the water passing through the precooler 5 is sprayed into the condenser 4 to realize the reduction of the water temperature in an evaporative heat absorption mode and is finally reduced to 25 ℃, and the cooling of the data center is realized through the matching operation of the 3 units.

When a certain natural cold source outside the room can be utilized, the mixed circulation mode is operated, the bypass valve 11 is closed, the bypass valve 13 is closed, and the refrigerant pump 12 operates, and because the mixed circulation mode has a certain natural cold source and the compression ratio of the compressor 7 is small, the insufficient pressure head is compensated through the action of the refrigerant pump 12; a circulation loop is formed by the compressor 7, the condenser 4, the liquid storage device 10, the refrigerant pump 12, the throttling device 2 and the water side evaporator 14, a condensation loop is formed by the condenser 4, the precooling heat exchanger 5, the evaporative cooling heat exchanger 6 and the water pump 1, and a tail end loop is formed by the water side evaporator 14, the water pump 1, the water valve 15 and the tail end evaporator 3 and is used for refrigerating data centers. The low-temperature chilled water at the tail end side evaporates and absorbs heat at the tail end evaporator 3, for example, the temperature is 15 ℃, after refrigeration is finished and the low-temperature chilled water leaves the tail end evaporator 3, the low-temperature chilled water is changed into high-temperature chilled water which enters the water side evaporator 14 to carry out heat exchange, for example, the temperature is 20 ℃, the high-temperature chilled water is cooled into low-temperature chilled water again by the host unit, wherein liquid (gas-liquid mixed state) refrigerant enters the water side evaporator 14 to absorb the heat of the high-temperature chilled water, the chilled water is reduced to the low-temperature chilled water at the temperature of 15 ℃, the low-temperature chilled water is changed into gas state refrigerant which is discharged by the compressor 7 to enter the condenser 4 to be cooled into liquid working medium, the liquid working medium enters the liquid reservoir 10 to be stored, enters the throttling device 2 through the pressurization effect of the refrigerant pump 12 to appropriately throttle and reduce the pressure, and enters the water side evaporator again to carry out evaporation and heat absorption, the refrigeration purpose is realized, and the circulation is formed in such a way, because the outdoor temperature is lower, the pressure difference of the compressor 7 possibly exists, the poor circulation of the system and the poor cooling of the motor of the compressor 7 are avoided, so that the refrigerant pump 12 is added to strengthen the circulation and strengthen the cooling of the motor. The low-temperature cooling water which is cooled by the outdoor air in the evaporative cooling heat exchanger 6 is conveyed to the condenser 4 through the action of the water pump 1 to realize the condensation of the refrigerant of the main unit at 15 degrees, the temperature of the low-temperature cooling water is increased at 20 degrees, the low-temperature cooling water enters the precooling heat exchanger 5 preferentially to perform a precooling action on the outdoor air at 25 degrees, the temperature of the water entering the precooling heat exchanger 5 is 20 degrees, the air is precooled at one time at 22 degrees, the water passing through the precooler 5 is sprayed into the condenser 4 to reduce the water temperature through an evaporative heat absorption mode and finally reduced to 15 degrees, and thus the temperature of the data center is reduced through the matching operation of 3 units.

When the unit is not provided with the bypass valve 8, the refrigeration mode is the same as the compound mode, and both modes are mixed modes.

When a sufficient natural cooling source can be used outdoors, the wet natural cooling mode is operated, and the bypass valve 11 is closed and the bypass valve 13 is opened. A circulation loop is formed by the condenser 4, the liquid storage device 10, the refrigerant pump 12, the throttling device 2 and the water side evaporator 14, a condensation loop is formed by the condenser 4, the precooling heat exchanger 5, the evaporation cooling heat exchanger 6 and the water pump 1, and a tail end loop is formed by the water side evaporator 14, the water pump 1, the water valve 15 and the tail end evaporator 3 and is used for refrigerating data centers. The low-temperature chilled water at the tail end side evaporates and absorbs heat at the tail end evaporator 3, if the temperature is 15 ℃, after refrigeration is finished and the low-temperature chilled water leaves the tail end evaporator 3, the low-temperature chilled water is changed into high-temperature chilled water and enters the water side evaporator 14 for heat exchange, if the temperature is 20 ℃, the high-temperature chilled water is cooled again into low-temperature chilled water by the host unit, a liquid (gas-liquid mixed state) refrigerant enters the water side evaporator 14 to absorb the heat of the high-temperature chilled water, the chilled water is reduced to be 15-DEG C low-temperature chilled water, the low-temperature chilled water is changed into a gaseous refrigerant and enters the condenser 4 to be cooled into a liquid working medium, the liquid working medium enters the liquid storage device 10 to be stored, the liquid working medium enters the throttling device 2 through the refrigerant pump, throttling effect is almost not performed, the low-temperature chilled water enters the water side evaporator 14 again for evaporation and heat absorption, the refrigeration purpose is achieved, and the circulation is formed. The low-temperature cooling water which is cooled by the outdoor air in the condenser 4 is conveyed to the condenser 4 through the action of the water pump 1 to realize the condensation of the refrigerant of the main unit, the temperature of the low-temperature cooling water is increased to 15 degrees, the low-temperature cooling water enters the pre-cooling heat exchanger 5 preferentially to preheat the outdoor air once, the temperature of the outdoor air is increased to-10 degrees, the temperature of the water entering the pre-cooling heat exchanger 5 is 15 degrees, the air is preheated once, the temperature is increased to 5 degrees, the water after passing through the pre-cooler 5 is sprayed into the indirect evaporative cooler 6 to realize the reduction of the water temperature through an evaporation heat absorption mode, and the water temperature is finally reduced to 10 degrees, so that the 2 units are matched to operate to realize the reduction of the temperature of the data center. Because the outdoor temperature is low in winter, the precooling heat exchanger 5 has a preheating function, water in a common cooling tower can splash to the edge of the cooling tower and ice along with the low-temperature action of air, the efficiency is influenced, generally, a compensation electric heating means or an artificial deicing mode is adopted for the icing of the cooling tower, the energy consumption of a unit is increased, and the efficiency of the unit is reduced, and the precooling heat exchanger 5 is adopted for heating low-temperature air once because the return water temperature is generally higher than 15 ℃, so that the inside and the edge of the whole tower are both in the temperature state of 0 ℃ or even higher than 5 ℃, the ice formation problem is solved, and the operation efficiency is improved.

When the outdoor sufficient natural cooling source can be used and the temperature is extremely low, the dry natural cooling mode is operated, the bypass valve 11 is closed, and the bypass valve 13 is opened. A circulation loop is formed by the condenser 4, the liquid storage device 10, the refrigerant pump 12, the throttling device 2 and the water side evaporator 14, the water pump 1 is stopped, heat dissipation is completed only by the fan, and a tail end loop formed by the water side evaporator 14, the water pump 1, the water valve 15 and the tail end evaporator 3 refrigerates a data center. The low-temperature chilled water at the tail end side evaporates and absorbs heat in the tail end evaporator 3, if the temperature is 15 ℃, the low-temperature chilled water is changed into high-temperature chilled water after being refrigerated and leaving the tail end evaporator 14, the high-temperature chilled water enters the water side evaporator 14 for heat exchange, if the temperature is 20 ℃, the high-temperature chilled water is cooled into low-temperature chilled water again by the host unit, liquid (gas-liquid mixed state) refrigerant enters the water side evaporator 14 to absorb the heat of the high-temperature chilled water, the chilled water is reduced to 15-temperature chilled water, the low-temperature chilled water is changed into gaseous refrigerant and enters the condenser 4, the refrigerant is cooled into liquid working medium, the liquid working medium enters the liquid accumulator 10 for storage, the liquid working medium enters the throttling device 2 through the refrigerant pump 12, throttling effect is almost not performed, the low-temperature chilled water enters the water side evaporator 14 again for evaporation and heat absorption, the refrigeration purpose is achieved, and circulation is formed. At the moment, the outdoor temperature is extremely low, such as-15 ℃ or lower, the cooling tower does not depend on evaporative cooling for heat dissipation any more, the condenser 4 can realize heat dissipation only by air cooling, such as-15 ℃, the condensing temperature can reach the set requirement by the speed regulation operation of the fan, and the 2 units are matched to operate to realize the cooling of the data center. And because the outdoor air temperature is low in winter, water in the cooling tower is discharged, and the risk of icing of the unit is solved.

The working principle is as follows: when no natural cold source available outdoors exists, the refrigeration cycle mode is operated, the bypass valve 11 is opened, and the bypass valve 13 is closed; a circulation loop is formed by the compressor 7, the condenser 4, the liquid storage device 10, the bypass valve 11, the throttling device 2 and the water side evaporator 14, at the moment, the refrigerant pump 12 is closed, the precooling heat exchanger 5 and the water pump 1 form a condensation loop, and a tail end loop formed by the water side evaporator 14, the water pump 1, the water valve 15 and the tail end evaporator 3 refrigerates data centers. The low-temperature chilled water at the tail end side evaporates and absorbs heat in the tail end evaporator 3, for example, 15-degree low-temperature chilled water, after refrigeration is finished and the low-temperature chilled water leaves the tail end evaporator 3, the low-temperature chilled water is changed into high-temperature chilled water to enter the water side evaporator for heat exchange, for example, 20-degree high temperature chilled water is cooled into low-temperature chilled water again by the host unit, wherein liquid (gas-liquid mixed state) refrigerant enters the water side evaporator 14 to absorb heat of the high-temperature chilled water, the chilled water is reduced in temperature to be 15-degree low-temperature chilled water, the low-temperature chilled water is changed into gas state refrigerant, the gas state refrigerant is discharged by the compressor 7 to enter the condenser 4 and is cooled into liquid state working medium, the liquid state working medium enters the liquid reservoir 10 for storage, and directly enters the throttling device 2 for throttling and pressure reduction through the opened bypass valve 11, and enters the water side evaporator 14 again for evaporation and heat absorption, the refrigeration purpose is achieved, and circulation is formed. The low-temperature cooling water which is cooled by the outdoor air in the evaporative cooling heat exchanger 6 is conveyed to the condenser 4 through the action of the water pump 1 to realize the condensation of the refrigerant of the main unit at 25 ℃ and the temperature of the low-temperature cooling water is increased at 30 ℃, the low-temperature cooling water enters the precooling heat exchanger 5 preferentially to perform a precooling action on the outdoor air at 35 ℃ for example, the temperature of the water entering the precooling heat exchanger 5 is 30 ℃, the air is precooled at one time at 32 ℃ for example, the water passing through the precooler 5 is sprayed into the condenser 4 to realize the reduction of the water temperature in an evaporative heat absorption mode and is finally reduced to 25 ℃, and the cooling of the data center is realized through the matching operation of the 3 units.

When a certain natural cold source outside the room can be utilized, the mixed circulation mode is operated, the bypass valve 11 is closed, the bypass valve 13 is closed, and the refrigerant pump 12 is operated, so that the compressor 7 has a small compression ratio due to the certain natural cold source, and the insufficient pressure head is compensated through the action of the refrigerant pump 12; a circulation loop is formed by the compressor 7, the condenser 4, the liquid storage device 10, the refrigerant pump 12, the throttling device 2 and the water side evaporator 14, a condensation loop is formed by the condenser 4, the precooling heat exchanger 5, the evaporative cooling heat exchanger 6 and the water pump 1, and a tail end loop is formed by the water side evaporator 14, the water pump 1, the water valve 15 and the tail end evaporator 3 and is used for refrigerating data centers. The low-temperature chilled water at the tail end side evaporates and absorbs heat at the tail end evaporator 3, for example, the temperature is 15 ℃, after refrigeration is finished and the low-temperature chilled water leaves the tail end evaporator 3, the low-temperature chilled water is changed into high-temperature chilled water which enters the water side evaporator 14 to carry out heat exchange, for example, the temperature is 20 ℃, the high-temperature chilled water is cooled into low-temperature chilled water again by the host unit, wherein liquid (gas-liquid mixed state) refrigerant enters the water side evaporator 14 to absorb the heat of the high-temperature chilled water, the chilled water is reduced to the low-temperature chilled water at the temperature of 15 ℃, the low-temperature chilled water is changed into gas state refrigerant which is discharged by the compressor 7 to enter the condenser 4 to be cooled into liquid working medium, the liquid working medium enters the liquid reservoir 10 to be stored, enters the throttling device 2 through the pressurization effect of the refrigerant pump 12 to appropriately throttle and reduce the pressure, and enters the water side evaporator again to carry out evaporation and heat absorption, the refrigeration purpose is realized, and the circulation is formed in such a way, because the outdoor temperature is lower, the pressure difference of the compressor 7 possibly exists, the poor circulation of the system and the poor cooling of the motor of the compressor 7 are avoided, so that the refrigerant pump 12 is added to strengthen the circulation and strengthen the cooling of the motor. The low-temperature cooling water which is cooled by the outdoor air in the evaporative cooling heat exchanger 6 is conveyed to the condenser 4 through the action of the water pump 1 to realize the condensation of the refrigerant of the main unit at 15 degrees, the temperature of the low-temperature cooling water is increased at 20 degrees, the low-temperature cooling water enters the precooling heat exchanger 5 preferentially to perform a precooling action on the outdoor air at 25 degrees, the temperature of the water entering the precooling heat exchanger 5 is 20 degrees, the air is precooled at one time at 22 degrees, the water passing through the precooler 5 is sprayed into the condenser 4 to reduce the water temperature through an evaporative heat absorption mode and finally reduced to 15 degrees, and thus the temperature of the data center is reduced through the matching operation of 3 units.

When the outdoor sufficient natural cooling source can be used, the wet natural cooling mode is operated, and the bypass valve 11 is closed and the bypass valve 13 is opened. A circulation loop is formed by the condenser 4, the liquid storage device 10, the refrigerant pump 12, the throttling device 2 and the water side evaporator 14, a condensation loop is formed by the condenser 4, the precooling heat exchanger 5, the evaporation cooling heat exchanger 6 and the water pump 1, and a tail end loop is formed by the water side evaporator 14, the water pump 1, the water valve 15 and the tail end evaporator 3 and is used for refrigerating data centers. The low-temperature chilled water at the tail end side evaporates and absorbs heat at the tail end evaporator 3, if the temperature is 15 ℃, the low-temperature chilled water is changed into high-temperature chilled water after refrigeration is finished and the high-temperature chilled water leaves the tail end evaporator 3, the high-temperature chilled water enters the water side evaporator 14 for heat exchange, if the temperature is 20 ℃, the high-temperature chilled water is cooled into low-temperature chilled water again by the host unit, liquid (gas-liquid mixed state) refrigerant enters the water side evaporator 14 to absorb the heat of the high-temperature chilled water, the chilled water is reduced to be 15-temperature low-temperature chilled water, the temperature of the chilled water is changed into gas state refrigerant, the gas state refrigerant enters the condenser 4 and is cooled into liquid state working medium, the liquid state working medium enters the liquid storage device 10 for storage, the liquid state working medium enters the throttling device 2 through the refrigerant pump, throttling effect is almost not performed, the water side evaporator 14 again for evaporation and heat absorption, the refrigeration purpose is achieved, and circulation is formed. The low-temperature cooling water which is cooled by the outdoor air in the condenser 4 is conveyed to the condenser 4 through the action of the water pump 1 to realize the condensation of the refrigerant of the main unit, the temperature of the low-temperature cooling water is increased to 15 degrees, the low-temperature cooling water enters the pre-cooling heat exchanger 5 preferentially to preheat the outdoor air once, the temperature of the outdoor air is increased to-10 degrees, the temperature of the water entering the pre-cooling heat exchanger 5 is 15 degrees, the air is preheated once, the temperature is increased to 5 degrees, the water after passing through the pre-cooler 5 is sprayed into the indirect evaporative cooler 6 to realize the reduction of the water temperature through an evaporation heat absorption mode, and the water temperature is finally reduced to 10 degrees, so that the 2 units are matched to operate to realize the reduction of the temperature of the data center. Because the outdoor temperature is low in winter, the precooling heat exchanger 5 has a preheating function, water in a common cooling tower can splash to the edge of the cooling tower and ice along with the low-temperature action of air, the efficiency is influenced, generally, a compensation electric heating means or an artificial deicing mode is adopted for the icing of the cooling tower, the energy consumption of a unit is increased, and the efficiency of the unit is reduced, and the precooling heat exchanger 5 is adopted for heating low-temperature air once because the return water temperature is generally higher than 15 ℃, so that the inside and the edge of the whole tower are both in the temperature state of 0 ℃ or even higher than 5 ℃, the ice formation problem is solved, and the operation efficiency is improved.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. An evaporative cooling composite air conditioning system with precooling is characterized by comprising a condenser (4), wherein an inlet of the condenser (4) is connected with an interface A of a host unit, and an outlet of the condenser (4) is connected with an interface B of the host unit; the other end of the interface of the main unit B is connected with an accumulator (10), the other end of the accumulator (10) is respectively connected with a refrigerant pump (12) and a bypass valve (11), and the other ends of the refrigerant pump (12) and the bypass valve (11) are commonly connected with the interface of the main unit C;

one end of the interface of the host unit A, which is far away from the access port of the condenser (4), is respectively connected with a compressor (7) and a bypass valve (13), and the other ends of the compressor (7) and the bypass valve (13) are commonly connected with the interface of the host unit D;

one end of the interface C of the host unit is respectively connected with a tail end evaporator (3) and a water side evaporator (14), and the lower end of the tail end evaporator (3) is connected with a throttling device (2); the lower end of the water side evaporator (14) is connected with a water valve (15), and the lower ends of the throttling device (2) and the water valve (15) are connected to a D interface of the host unit together.

2. The evaporative cooling composite air conditioning system with precooling according to claim 1, further comprising a water pump (1), wherein one end of the water pump (1) is connected with the condenser (4), the other end of the water pump is connected with a precooling heat exchanger (5), and the precooling heat exchanger (5) is connected with an evaporative cooling heat exchanger (6).

3. An evaporative cooling hybrid air conditioning system with pre-cooling as set forth in claim 1, characterized in that a first sight glass (8) and a first filter (9) are connected between the host unit B interface and the reservoir (10).

4. The evaporative cooling composite type air conditioning system with pre-cooling function as claimed in claim 2, wherein two pre-cooling heat exchangers (5) are respectively located at two sides of the evaporative cooling heat exchanger (6).

5. An evaporative cooling hybrid air conditioning system with pre-cooling as set forth in claim 1, characterized in that a second sight glass and a second filter are provided between the accumulator (10) and the refrigerant pump (12).

6. An evaporative cooling hybrid air conditioning system with pre-cooling as set forth in claim 1, characterized in that the number of the compressors (7) is plural, and the plural compressors (7) are connected in parallel.

7. An evaporative cooling hybrid air conditioning system with pre-cooling as set forth in claim 1, characterized in that the throttling device (2) is an electronic expansion valve.

8. An evaporative cooling hybrid air conditioning system with pre-cooling as set forth in claim 1, characterized in that the condenser (4) is a stainless steel tube.