Indirect evaporative cooling system suitable for all regions

Abstract

The utility model relates to an indirect evaporative cooling system suitable for all regions, which is characterized in that a cold liquid return end of the system is communicated with a cold plate liquid outlet in a cold liquid cabinet in a machine room, and a cold liquid supply end of the system is communicated with a cold plate liquid inlet in the cold liquid cabinet in the machine room; the system comprises a cooling-water machine, a double-cold-source tail end air conditioner, a first plate heat exchanger, an anti-freezing indirect evaporation cooling tower, a first circulating water pump, a second circulating water pump, a first electric valve and a controller. The double-cold-source tail end air conditioner is located in the machine room. The anti-freezing indirect evaporative cooling tower comprises an indirect evaporative cooling unit and an anti-freezing unit; and the first circulating pump, the second circulating pump, the first electric valve, the second electric valve, the cooling-water machine and the indirect evaporative cooling unit are electrically connected with the controller. Different operation modes can be adopted according to different seasons, external natural air cooling is fully utilized for heat dissipation and cooling, energy consumption can be reduced, and freezing prevention can be achieved in ultra-low-temperature seasons.

Description

Technical Field

[0001] The utility model relates to the field of evaporative cooling systems and controls, and in particular to an indirect evaporative cooling system suitable for all regions. Background Art

[0002] As more and more data is generated, the density of data centers is also increasing, and the temperature of data centers is gradually rising. Cooling and energy saving in data centers have become a major solution. Currently, the computer rooms of data centers use inter-row air conditioners and room air conditioners to cool the computer rooms. However, both inter-row air conditioners and room air conditioners require compressor mechanical refrigeration and cooling, which is very energy-consuming. In addition, this method cannot switch between multiple modes according to changes in the external ambient temperature to utilize natural cooling sources, does not fully utilize natural air cooling, and is not energy-efficient.

[0003] At the same time, in northern China during the winter, the indirect evaporative cooling system is prone to ice curtain phenomenon, which greatly reduces the cooling efficiency. Utility Model Content

[0004] In order to overcome the shortcomings of existing products and technologies, the utility model provides an indirect evaporative cooling system suitable for all regions. It can adopt different operating modes according to different seasons, make full use of natural cold sources, coordinate mechanical cooling methods, and integrate air-liquid combination, dual cold source technology and waste heat recovery to form a multifunctional indirect evaporative cooling system for use in all regions.

[0005] The technical solution of the implementation case of this utility model is as follows:

[0006] An indirect evaporative cooling system applicable to all regions, wherein the cold liquid return end of the system is connected to the cold plate outlet of the cold liquid cabinet in the machine room through a pipe, and the cold liquid supply end of the system is connected to the cold plate inlet of the cold liquid cabinet in the machine room through a pipe. The system includes a chiller, a dual-cold source terminal air conditioner, a first plate heat exchanger, an antifreeze indirect evaporative cooling tower, a first circulating water pump, a second circulating water pump, a first electric valve, and a controller;

[0007] The hot end inlet of the first plate heat exchanger is connected to the cold plate liquid outlet of the cold liquid cabinet in the machine room through a pipeline, the hot end outlet of the first plate heat exchanger is connected to the water inlet of the first circulating water pump through a pipeline, the water outlet of the first circulating water pump is connected to one end of the first electric valve and the cold plate liquid inlet of the cold liquid cabinet in the machine room through pipelines, and the other end of the first electric valve is connected to the first liquid inlet of the dual-cold source terminal air conditioner through a pipeline;

[0008] The first liquid outlet of the dual-cold-source terminal air conditioner is connected to the hot end inlet of the first plate heat exchanger through a pipeline, the second liquid outlet of the dual-cold-source terminal air conditioner is connected to the evaporation end inlet of the chiller through a pipeline, the evaporation end outlet of the chiller is connected to the water inlet of the second circulating water pump through a pipeline, and the water outlet of the second circulating water pump is connected to the second liquid inlet of the dual-cold-source terminal air conditioner through a pipeline, and the dual-cold-source terminal air conditioner is located in the machine room;

[0009] The antifreeze indirect evaporative cooling tower includes an indirect evaporative cooling unit and an antifreeze unit, the antifreeze unit includes a surface cooler and a second electric valve, the surface cooler is located in front of the air inlet direction of the indirect evaporative cooling unit, the water inlet of the indirect evaporative cooling unit is connected with the water outlet of the surface cooler and the condensing end outlet of the chiller through a pipeline, the water outlet of the indirect evaporative cooling unit is connected with the cold end inlet of the first plate heat exchanger through a pipeline, the cold end outlet of the first plate heat exchanger is connected with the water inlet of the indirect evaporative cooling unit and one end of the second electric valve through a pipeline, and the other end of the second electric valve is connected with the water inlet of the surface cooler through a pipeline;

[0010] The first circulation pump, the second circulation pump, the first electric valve, the second electric valve, the chiller, and the indirect evaporative cooling unit are electrically connected to the controller.

[0011] Preferably, a second plate heat exchanger is further included, the hot end inlet of the second plate heat exchanger is connected to the cold plate outlet in the cold liquid cabinet in the machine room through a pipeline, the hot end outlet of the second plate heat exchanger is connected to the water inlet of the first circulating water pump through a pipeline, the cold end outlet of the first plate heat exchanger is connected to the domestic hot water supply network through a pipeline, and the cold end inlet of the first plate heat exchanger is connected to the domestic hot water return network through a pipeline.

[0012] Preferably, the dual-cold source terminal air conditioner includes a primary cooling heat exchange coil and a secondary cooling heat exchange coil. The liquid outlet of the primary cooling heat exchange coil is connected to the hot end inlet of the first plate heat exchanger through a pipeline, the liquid inlet of the primary cooling heat exchange coil is connected to one end of the first electric valve through a pipeline, the liquid inlet of the secondary cooling heat exchange coil is connected to the water outlet of the second circulating water pump through a pipeline, and the liquid outlet of the secondary cooling heat exchange coil is connected to the evaporation end inlet of the chiller through a pipeline.

[0013] Preferably, the indirect evaporative cooling unit includes an indirect evaporative cooling module and a third electric valve, the water outlet of the indirect evaporative cooling module is connected to one end of the third electric valve through a pipe, and the other end of the third electric valve is connected to the water inlet of the surface cooler through a pipe.

[0014] Preferably, the indirect evaporative cooling module includes an upper water distributor, an upper filler, a lower water distributor, a lower filler, a water receiving and storage tank, an air valve, a cooling pump and a fan, the air valve is located in front of the upper filler in the air inlet direction, the upper water distributor is located above the upper filler, the water inlet of the upper water distributor is connected with the water outlet of the cooling pump through a pipe, the water inlet of the cooling pump is connected with the water outlet of the surface cooler through a pipe, the lower water distributor is located below the upper filler, the lower filler is located below the lower water distributor, the water receiving and storage tank is located below the lower filler, the surface cooler is located in front of the lower filler in the air inlet direction, the fan is located at the top of the indirect evaporative cooling module, and the fan, the third electric valve, the cooling pump and the controller are electrically connected.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] By setting up a plate heat exchanger and a cooling tower, the computer room can be cooled by natural cooling in the low temperature environment in winter; by setting up a chiller and a dual-cold source terminal air conditioner, the cooling temperature requirement of the computer room in the medium and high temperature environment in other seasons is achieved; by setting up a plate heat exchanger to connect to the domestic water supply network, the cooling efficiency of the system is further improved; by setting the cooling tower as an anti-freeze indirect evaporative cooling tower, and by setting up multiple electric valves and air valves in the system, the system can operate in different modes in different temperature periods, so that the cooling tower can start the pre-cooling function at the air inlet during the medium and high temperature period to further reduce the cooling water temperature, and the cooling tower can start the preheating function at the air inlet during the ultra-low temperature period to heat the external cold air and prevent frost and ice from forming inside the cooling tower, which will lead to a decrease in cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the principle of an indirect evaporative cooling system applicable to all regions in the present utility model;

[0018] Figure 2 This is a schematic diagram of the principle of an indirect evaporative cooling system applicable to all regions in the present invention operating during a high temperature period;

[0019] Figure 3 This is a schematic diagram of the principle of an indirect evaporative cooling system applicable to all regions in the present invention operating in a medium temperature period;

[0020] Figure 4 This is a schematic diagram of the principle of an indirect evaporative cooling system applicable to all regions in the present invention operating in a low temperature period;

[0021] Figure 5 This is a schematic diagram of the principle of an indirect evaporative cooling system applicable to all regions of the present invention operating in an ultra-low temperature period;

[0022] 10. Chiller; 20. Dual-cold-source terminal air conditioner; 21. Primary cooling heat exchange coil; 22. Secondary cooling heat exchange coil; 30. First plate heat exchanger; 40. Antifreeze indirect evaporative cooling tower; 411. Third electric valve; 412. Upper water distributor; 413. Upper filler; 414. Lower water distributor; 415. Lower filler; 416. Water receiving tank; 417. Air valve; 418. Cooling pump; 419. Fan; 421. Second electric valve; 422. Surface cooler; 50. First circulating water pump; 60. Second circulating water pump; 70. First electric valve; 80. Second plate heat exchanger; 90. Machine room; 91. Refrigerant cabinet. DETAILED DESCRIPTION

[0023] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to facilitate a more thorough and comprehensive understanding of the disclosure of the present invention.

[0024] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] like Figure 1 As shown, Figure 1This is a schematic diagram of the principle of an indirect evaporative cooling system suitable for all areas in the present invention; an indirect evaporative cooling system suitable for all areas, the cold liquid return end of the system is connected to the cold plate outlet in the cold liquid cabinet in the machine room through a pipe, and the cold liquid supply end of the system is connected to the cold plate inlet in the cold liquid cabinet in the machine room through a pipe. The system includes a chiller, a dual-cold source terminal air conditioner, a first plate heat exchanger, an antifreeze indirect evaporative cooling tower, a first circulating water pump, a second circulating water pump, a first electric valve and a controller; the hot end inlet of the first plate heat exchanger is connected through The pipeline is connected to the cold plate liquid outlet in the cold liquid cabinet in the machine room, the hot end outlet of the first plate heat exchanger is connected to the water inlet of the first circulating water pump through a pipeline, the water outlet of the first circulating water pump is connected to one end of the first electric valve and the cold plate liquid inlet in the cold liquid cabinet in the machine room through a pipeline, the other end of the first electric valve is connected to the first liquid inlet of the dual-cold source terminal air conditioner through a pipeline; the first liquid outlet of the dual-cold source terminal air conditioner is connected to the hot end inlet of the first plate heat exchanger through a pipeline, and the second liquid outlet of the dual-cold source terminal air conditioner is connected to the second liquid outlet of the dual-cold source terminal air conditioner through a pipeline. The evaporation end outlet of the chiller is communicated with the water inlet of the second circulating water pump through a pipe, and the water outlet of the second circulating water pump is communicated with the second liquid inlet of the dual-cold source terminal air conditioner through a pipe, and the dual-cold source terminal air conditioner is located in the machine room; the antifreeze indirect evaporative cooling tower includes an indirect evaporative cooling unit and an antifreeze unit, and the antifreeze unit includes a surface cooler and a second electric valve, and the surface cooler is located in front of the air inlet direction of the indirect evaporative cooling unit, and the water inlet of the indirect evaporative cooling unit is respectively connected to the surface cooler through a pipe. The water outlet of the cooler is connected to the condensing end outlet of the chiller, the water outlet of the indirect evaporative cooling unit is connected to the cold end inlet of the first plate heat exchanger through a pipeline, the cold end outlet of the first plate heat exchanger is connected to the water inlet of the indirect evaporative cooling unit and one end of the second electric valve through pipelines, and the other end of the second electric valve is connected to the water inlet of the surface cooler through a pipeline; the first circulating pump, the second circulating pump, the first electric valve, the second electric valve, the chiller, the indirect evaporative cooling unit and the controller are electrically connected.

[0027] This system is applicable throughout China. During periods of high temperatures, it utilizes a combination of external natural cooling and mechanical refrigeration to provide cooling for the data center computer room. A combination of liquid cooling and air cooling is used to cool the servers and computer room space. During periods of low temperatures, it fully utilizes natural cooling to provide cooling for the data center computer room. It also uses the temperature of the return water from the liquid cooling system to heat the external low-temperature space, preventing frost and ice from forming on the cooling tower and reducing operational failures.

[0028] This system is mainly composed of an antifreeze cooling tower, a chiller, a terminal air conditioner, and a plate heat exchanger. The entire system is controlled by a controller to control the first electric valve, the second electric valve, and the third electric valve to adapt to the ambient temperature and operate in which mode. In different modes, the chiller is also controlled to be turned on and off.

[0029] As for the antifreeze indirect evaporative cooling tower, in the utility model, it is mainly composed of an indirect evaporative cooling unit and an antifreeze unit. The indirect evaporative cooling unit cools the spray water through evaporation of external natural wind and internal spray water to obtain low-temperature cooling water, while the antifreeze unit is mainly composed of a surface cooler and a second electric valve jointly controlled. When the temperature is low, the second electric valve opens, and hot water enters the surface cooler to exchange heat with the external cold air to increase the temperature, thereby achieving antifreeze.

[0030] In order to further improve the cooling efficiency of the indirect evaporative cooling unit and make full use of the usage rate of the surface cooler in the antifreeze unit during non-low temperature periods, for the indirect evaporative cooling unit, preferably, the indirect evaporative cooling unit includes an indirect evaporative cooling module and a third electric valve, and the water outlet of the indirect evaporative cooling module is connected to one end of the third electric valve through a pipe, and the other end of the third electric valve is connected to the water inlet of the surface cooler through a pipe.

[0031] The third electric valve provides an additional liquid path for the cooler. When the third electric valve is open, the low-temperature coolant in the indirect evaporative cooling module enters the cooler, pre-cooling the outside air through heat exchange. This improves the cooling and heat exchange efficiency of the entire indirect evaporative cooling unit and produces coolant at a lower temperature. The opening of the third electric valve is controlled by a controller based on the real-time external ambient temperature.

[0032] As for how the indirect evaporative cooling module obtains low-temperature coolant, specifically, the indirect evaporative cooling module includes an upper water distributor, an upper filler, a lower water distributor, a lower filler, a water receiving and storage tank, an air valve, a cooling pump and a fan. The air valve is located in front of the air inlet direction of the upper filler, the upper water distributor is located above the upper filler, the water inlet of the upper water distributor is connected with the water outlet of the cooling pump through a pipe, the water inlet of the cooling pump is connected with the water outlet of the surface cooler through a pipe, the lower water distributor is located below the upper filler, the lower filler is located below the lower water distributor, the water receiving and storage tank is located below the lower filler, the surface cooler is located in front of the air inlet direction of the lower filler, the fan is located at the top of the indirect evaporative cooling module, and the fan, the third electric valve, the cooling pump and the controller are electrically connected.

[0033] This module is divided into upper and lower cooling. During high temperature periods, the air valve opens, and the external hot air first enters the upper layer of packing for evaporation and heat exchange, producing higher temperature cooling water. This water flows into the lower water distributor, which then enters the lower layer of packing and enters the cloth shower. It exchanges heat with the pre-cooled cold powder to produce lower temperature cooling water, which flows into the water storage tank. The air valve of this module is opened or closed according to the external temperature. It opens when the temperature is above 0℃ and closes when it is below 0℃.

[0034] In order to fully utilize the heat generated by the liquid-cooled data center and further improve the cooling efficiency of the liquid-cooled data center, preferably, the system also includes a second plate heat exchanger, the hot end inlet of the second plate heat exchanger is connected to the cold plate outlet in the cold liquid cabinet in the computer room through a pipeline, the hot end outlet of the second plate heat exchanger is connected to the water inlet of the first circulating water pump through a pipeline, the cold end outlet of the first plate heat exchanger is connected to the domestic hot water supply network through a pipeline, and the cold end inlet of the first plate heat exchanger is connected to the domestic hot water return network through a pipeline.

[0035] The utility model connects the system to the domestic water system, and uses the hot coolant in the machine room to heat the external domestic water at normal temperature through the plate heat exchanger. At the same time, the normal temperature domestic water also exchanges heat with the hot and cold coolant to cool it down, and the heat exchange is completed in the plate heat exchanger.

[0036] As for how the dual-cold source terminal air conditioner realizes dual cold sources to cool the computer room space, specifically, the dual-cold source terminal air conditioner includes a primary cooling heat exchange coil and a secondary cooling heat exchange coil. The liquid outlet of the primary cooling heat exchange coil is connected to the hot end inlet of the first plate heat exchanger through a pipe, the liquid inlet of the primary cooling heat exchange coil is connected to one end of the first electric valve through a pipe, the liquid inlet of the secondary cooling heat exchange coil is connected to the water outlet of the second circulating water pump through a pipe, and the liquid outlet of the secondary cooling heat exchange coil is connected to the evaporation end inlet of the chiller through a pipe.

[0037] The dual cold source module consists of two cooling heat exchange coils, which mainly realize heat exchange of the hot space of the computer room by connecting to different cold sources. The upper heat exchange coil is connected to the cold source of cooling water, and the lower heat exchange coil is connected to the cold source of the chiller. Relatively speaking, the cold source of the chiller has a lower temperature and generates more cooling capacity. Therefore, in summer, the chiller needs to be turned on. In spring and autumn, they can be used at the same time to save power consumption for the chiller and make it run in a low-power state. In winter, since the temperature of the cooling water is low enough, the cold source of cooling water can be used.

[0038] The system of the present invention has four operating modes, namely high temperature mode, medium temperature mode, low temperature mode and ultra-low temperature mode. The high temperature mode is suitable for the high temperature season in summer in all regions, the medium temperature mode is suitable for the medium temperature season in spring and autumn in all regions, the low temperature mode is suitable for the low temperature season in winter in the southern region, and the ultra-low temperature mode is suitable for the low temperature season in winter in the northern region.

[0039] like Figure 2 As shown, Figure 2 This is a schematic diagram of the principle of an indirect evaporative cooling system suitable for all regions in the present invention operating during high temperature periods; the controller measures the ambient temperature in real time through a temperature sensor. When the ambient temperature value is greater than 25°C, the controller sends a closing signal to the first electric valve and the second electric valve, and the controller sends an opening signal to the first circulating pump, the second circulating pump, the chiller, the cooling pump, the fan, and the third electric valve. The first electric valve and the second electric valve are closed, and the third electric valve, the first circulating pump, the second circulating pump, the chiller, the cooling pump, and the fan are turned on. The system operates in high temperature mode, cold water enters the surface cooler to pre-cool the external air, and cold water is not passed through the first cooling heat exchange coil; in high temperature mode, the high-temperature cooling water undergoes a series of evaporative cooling on the filler to obtain medium-temperature cooling water, which serves as the primary-side cold source. At this time, in high-temperature areas, the chiller must be turned on to provide a cold source for the terminal dual-cold source air conditioner and bear 30% of the heat dissipation of the server. The liquid-cooled cabinet serves as the terminal secondary side, exchanging heat with the cooling tower through plate exchangers, and bears 70% of the heat dissipation of the server. Through the combination of air and liquid, it can effectively reduce the PUE of the computer room. In addition, the return water temperature of the liquid-cooled cold plate can reach 60°C, and the waste heat can be recovered and used for domestic hot water or floor heating radiation system through plate exchangers.

[0040] like Figure 3 As shown, Figure 3This is a schematic diagram of the principle of an indirect evaporative cooling system applicable to all regions in the present invention operating in a medium temperature period; the controller measures the ambient temperature in real time through a temperature sensor. When the temperature value is less than or equal to 25°C and greater than 16°C, the controller sends a closing signal to the second electric valve, and the controller sends an opening signal to the first electric valve, the third electric valve, the first circulating pump, the second circulating pump, the chiller, the cooling pump, and the fan. The second electric valve is closed, and the first electric valve, the third electric valve, the first circulating pump, the second circulating pump, the chiller, the cooling pump, and the fan are turned on. The system operates in medium temperature mode, cold water enters the surface cooler to pre-cool the external air, and the first cooling heat exchange coil performs a single cooling; in medium temperature mode, the inlet water of the surface cooler is the cooling water supply, and after heat exchange with the ambient air, the outlet water of the surface cooler is sent back to the return water after the plate exchange. At this time, the two heat exchange coils in the dual-cold source air conditioner are connected to the cold source. The secondary side water supply after heat exchange with the indirect evaporative cooling tower is respectively supplied to the first cooling heat exchange coil of the dual-cold source air conditioner and the liquid-cooled cold plate in the liquid-cooled cabinet. After heat exchange, the water temperature rises and is collected back to the plate exchanger for heat exchange again. The waste heat recovery system continues to operate, which can reduce the processing capacity of the indirect evaporative cooling tower. Since the first cooling heat exchange coil of the dual-cold source air conditioner is turned on, the inlet air temperature of the second cooling heat exchange coil is pre-cooled, thereby effectively reducing the power consumption of the chiller, thereby reducing the overall PUE of the computer room.

[0041] like Figure 4 As shown, Figure 4 This is a schematic diagram of the principle of an indirect evaporative cooling system suitable for all regions in the present invention operating in a low-temperature period; the controller measures the ambient temperature in real time through a temperature sensor. When the temperature value is less than or equal to 16°C and greater than 0°C, the controller sends a closing signal to the second electric valve, the second circulating pump, and the chiller. The controller sends an opening signal to the first electric valve, the third electric valve, the first circulating pump, the cooling pump, and the fan. The second electric valve, the second circulating pump, and the chiller are closed, and the first electric valve, the third electric valve, the first circulating pump, the cooling pump, and the fan are turned on. The system operates in low-temperature mode, cold water enters the surface cooler to pre-cool the external air, the first cooling heat exchange coil is cooled, the second cooling heat exchange coil is not passed through water, and the chiller does not work; in low-temperature mode, the air valve is closed, and the water intake of the surface cooler is consistent with the medium-temperature mode. At this time, the second cooling heat exchange coil of the dual-cold source air conditioner is not turned on, that is, the chiller is not turned on, and it is fully natural cooling, and there is no need to consider the problem of freezing.

[0042] like Figure 5 As shown, Figure 5This is a schematic diagram of the principle of an indirect evaporative cooling system applicable to all regions of the present invention operating during ultra-low temperature periods. The controller measures the ambient temperature in real time using a temperature sensor. When the temperature value is less than or equal to 0°C, the controller sends a shutdown signal to the third electric valve, the second circulating pump, and the chiller. The controller sends an opening signal to the first electric valve, the second electric valve, the first circulating pump, the cooling pump, and the fan. The third electric valve, the second circulating pump, and the chiller are closed, and the first electric valve, the second electric valve, the first circulating pump, the cooling pump, and the fan are opened. The system operates in ultra-low temperature mode. Hot water enters the surface cooler to heat the external air, the first cooling heat exchange coil cools the outside air, the second cooling heat exchange coil is blocked, and the chiller does not operate. When operating in ultra-low temperature mode, the air valve is closed, the surface cooler water intake is opposite to that in medium temperature mode, and the high-temperature return water after heat exchange by the plate heat exchanger is directed to the surface cooler. The surface cooler can be used to heat the ambient air to prevent freezing during low-load operation in winter, effectively solving the problem of human and material losses caused by the need for manual ice-breaking when operating cooling towers in northern data centers in winter.

[0043] The beneficial effects of the present invention are: fully integrating evaporative cooling technology with mechanical cooling technology, dual cooling source technology, air-liquid combination technology, and waste heat recovery technology, effectively solving problems such as high energy consumption in the machine room and icing on the air inlet surface of the cooling tower in winter, removing restrictions due to geographical issues, and making it applicable to the entire region.

[0044] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above embodiments merely represent preferred implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. An indirect evaporative cooling system suitable for all regions, characterized in that: The cold liquid return end of the system is connected to the cold plate outlet of the cold liquid cabinet in the machine room through a pipeline, and the cold liquid supply end of the system is connected to the cold plate inlet of the cold liquid cabinet in the machine room through a pipeline. The system includes a chiller, a dual-cold source terminal air conditioner, a first plate heat exchanger, an antifreeze indirect evaporative cooling tower, a first circulating water pump, a second circulating water pump, a first electric valve and a controller; The hot end inlet of the first plate heat exchanger is connected to the cold plate liquid outlet of the cold liquid cabinet in the machine room through a pipeline, the hot end outlet of the first plate heat exchanger is connected to the water inlet of the first circulating water pump through a pipeline, the water outlet of the first circulating water pump is connected to one end of the first electric valve and the cold plate liquid inlet of the cold liquid cabinet in the machine room through pipelines, and the other end of the first electric valve is connected to the first liquid inlet of the dual-cold source terminal air conditioner through a pipeline; The first liquid outlet of the dual-cold-source terminal air conditioner is connected to the hot end inlet of the first plate heat exchanger through a pipeline, the second liquid outlet of the dual-cold-source terminal air conditioner is connected to the evaporation end inlet of the chiller through a pipeline, the evaporation end outlet of the chiller is connected to the water inlet of the second circulating water pump through a pipeline, and the water outlet of the second circulating water pump is connected to the second liquid inlet of the dual-cold-source terminal air conditioner through a pipeline, and the dual-cold-source terminal air conditioner is located in the machine room; The antifreeze indirect evaporative cooling tower includes an indirect evaporative cooling unit and an antifreeze unit, the antifreeze unit includes a surface cooler and a second electric valve, the surface cooler is located in front of the air inlet direction of the indirect evaporative cooling unit, the water inlet of the indirect evaporative cooling unit is connected with the water outlet of the surface cooler and the condensing end outlet of the chiller through a pipeline, the water outlet of the indirect evaporative cooling unit is connected with the cold end inlet of the first plate heat exchanger through a pipeline, the cold end outlet of the first plate heat exchanger is connected with the water inlet of the indirect evaporative cooling unit and one end of the second electric valve through a pipeline, and the other end of the second electric valve is connected with the water inlet of the surface cooler through a pipeline; The first circulating water pump, the second circulating water pump, the first electric valve, the second electric valve, the chiller, and the indirect evaporative cooling unit are electrically connected to the controller.

2. The indirect evaporative cooling system according to claim 1, characterized in that It also includes a second plate heat exchanger, the hot end inlet of the second plate heat exchanger is connected to the cold plate liquid outlet in the cold liquid cabinet in the machine room through a pipeline, the hot end outlet of the second plate heat exchanger is connected to the water inlet of the first circulating water pump through a pipeline, the cold end outlet of the first plate heat exchanger is connected to the domestic hot water supply network through a pipeline, and the cold end inlet of the first plate heat exchanger is connected to the domestic hot water return network through a pipeline.

3. The indirect evaporative cooling system according to claim 2, characterized in that: The dual-cold source terminal air conditioner includes a primary cooling heat exchange coil and a secondary cooling heat exchange coil. The liquid outlet of the primary cooling heat exchange coil is connected to the hot end inlet of the first plate heat exchanger through a pipeline, the liquid inlet of the primary cooling heat exchange coil is connected to one end of the first electric valve through a pipeline, the liquid inlet of the secondary cooling heat exchange coil is connected to the water outlet of the second circulating water pump through a pipeline, and the liquid outlet of the secondary cooling heat exchange coil is connected to the evaporation end inlet of the chiller through a pipeline.

4. The indirect evaporative cooling system according to claim 3, characterized in that The indirect evaporative cooling unit includes an indirect evaporative cooling module and a third electric valve. The water outlet of the indirect evaporative cooling module is connected to one end of the third electric valve through a pipeline, and the other end of the third electric valve is connected to the water inlet of the surface cooler through a pipeline.

5. The indirect evaporative cooling system according to claim 4, characterized in that The indirect evaporative cooling module includes an upper water distributor, an upper filler, a lower water distributor, a lower filler, a water receiving and storage tank, an air valve, a cooling pump and a fan. The air valve is located in front of the upper filler in the air inlet direction, the upper water distributor is located above the upper filler, the water inlet of the upper water distributor is connected with the water outlet of the cooling pump through a pipe, the water inlet of the cooling pump is connected with the water outlet of the surface cooler through a pipe, the lower water distributor is located below the upper filler, the lower filler is located below the lower water distributor, the water receiving and storage tank is located below the lower filler, the surface cooler is located in front of the lower filler in the air inlet direction, the fan is located at the top of the indirect evaporative cooling module, and the fan, the third electric valve, the cooling pump and the controller are electrically connected.

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