Cooling system combining indirect evaporation refrigeration with radiation refrigeration

Abstract

The utility model relates to a cooling system combining indirect evaporation refrigeration with radiation refrigeration, which comprises an indirect evaporation cooling tower, a cooling-water machine, a plate heat exchanger, a radiation circulation cooling water storage module, a tail end air conditioner, a cold water supply pump, a hot water return pump and a controller, the cold end outlet is communicated with a condensation water inlet end of the cooling-water machine, and a condensation water outlet end is communicated with a cooling water inlet end of the indirect evaporation cooling tower; the water outlet end of the tail end air conditioner is communicated with the water inlet end of the hot water return pump, the water outlet end is communicated with the water inlet end of the radiation circulation cooling water storage module, the water outlet end is communicated with the water inlet end of the cold water supply pump, the water outlet end is communicated with a hot end inlet of the plate heat exchanger, and a hot end outlet is communicated with an evaporation water inlet end of the cooling-water machine; the evaporation water outlet end is communicated with the water inlet end of the tail end air conditioner. Different operation modes can be adopted according to different seasons, the day and night temperature difference is fully utilized for refrigeration, and energy consumption can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of evaporative cooling and heat exchange products and controls, in particular to a cooling system combining indirect evaporative cooling with radiant cooling. 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 external ambient temperature to utilize natural cooling sources, does not fully utilize the temperature difference between day and night, and does not fully utilize radiant refrigeration and cold storage, which is not energy-efficient. Utility Model Content

[0003] In order to overcome the shortcomings of existing products and technologies, the utility model provides a cooling system of indirect evaporative refrigeration and synergistic radiant refrigeration, which can adopt different operating modes according to different seasons, make full use of nighttime radiant refrigeration to obtain low-temperature water, and store the low-temperature water for use during the day. In this way, natural energy can be fully utilized. The refrigeration process only needs to consume the power consumption of the water pump, and low-temperature water that is more than 10°C lower than the ambient temperature can be prepared. It has the characteristics of low energy consumption and high performance, greatly reducing energy consumption.

[0004] The technical solution of the implementation case of this utility model is as follows:

[0005] A cooling system of indirect evaporative cooling and radiant cooling, the cooling system comprising an indirect evaporative cooling tower, a chiller, a plate heat exchanger, a radiant circulating cooling water storage module, a terminal air conditioner, a cold water supply pump, a hot water return pump and a controller, the cooling water outlet of the indirect evaporative cooling tower is connected to the cold end inlet of the plate heat exchanger through a pipeline, the cold end outlet of the plate heat exchanger is connected to the condensation water inlet of the chiller through a pipeline, the condensation water outlet of the chiller is connected to the cooling water inlet of the indirect evaporative cooling tower through a pipeline; the water outlet of the terminal air conditioner is connected to the water inlet of the hot water return pump through a pipeline, The water outlet of the water return pump is connected to the water inlet of the radiation circulation cooling water storage module through a pipeline, the water outlet of the radiation circulation cooling water storage module is connected to the water inlet of the cold water supply pump through a pipeline, the water outlet of the cold water supply pump is connected to the hot end inlet of the plate heat exchanger through a pipeline, the hot end outlet of the plate heat exchanger is connected to the evaporation water inlet of the chiller through a pipeline, and the evaporation water outlet of the chiller is connected to the water inlet of the terminal air conditioner through a pipeline; the indirect evaporative cooling tower, the chiller, the radiation circulation cooling water storage module, the cold water supply pump, the hot water return pump and the controller are electrically connected.

[0006] Preferably, the radiation circulating cooling water storage module includes a water storage tank, a radiation refrigeration circulating water pump and a radiation cooler. The water storage tank has a hot water inlet, a cold water outlet, a hot water outlet and a cold water inlet. The hot water inlet is connected to the water outlet of the hot water return pump through a pipe, and the cold water outlet is connected to the water inlet of the cold water supply pump through a pipe. The hot water outlet is connected to the water inlet of the radiation refrigeration circulating water pump through a pipe, and the water outlet of the radiation refrigeration circulating water pump is connected to the water inlet of the radiation cooler through a pipe, and the water outlet of the radiation cooler is connected to the cold water inlet through a pipe.

[0007] Preferably, the radiation cooler includes a radiation plate, a heat-conducting coil, and an insulation layer. The water outlet of the heat-conducting coil is connected to the cold water inlet through a pipe, and the water inlet of the heat-conducting coil is connected to the hot water outlet through a pipe. The radiation plate is fitted and connected to one side of the heat-conducting coil, and the insulation layer is fitted and connected to the other side of the heat-conducting coil.

[0008] Preferably, the indirect evaporative cooling tower includes a tower body, a cooling wet film, a water receiving tank, a water distributor, a fan, and a cooling circulation pump. The water receiving tank is located at the bottom end of the tower body, the cooling wet film is located above the water receiving tank, the water distributor is located above the cooling wet film, the water inlet end of the cooling circulation pump is connected to the water receiving tank through a pipeline, the water outlet end of the cooling circulation pump is connected to the cold end inlet of the plate heat exchanger through a pipeline, and the fan is located at the upper end of the tower body.

[0009] Preferably, the indirect evaporative cooling tower further includes a surface cooler and a pre-cooling circulation pump. The surface cooler is located at the front end of the cooling wet film. The water inlet end of the surface cooler is connected to the water outlet end of the pre-cooling circulation pump through a pipeline. The water inlet end of the pre-cooling circulation pump is connected to the cold water outlet through a pipeline. The water outlet end of the surface cooler is connected to the hot water inlet through a pipeline.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] By setting up a radiation circulation cooling water storage module, the system can realize radiation cooling and water storage at night, and release cold water to provide a cold source during the day; by setting up an indirect evaporative cooling tower, cooling water for the first exchange is provided, and by setting up a chiller, a cold source for the secondary cooling exchange is provided. By setting up a controller to monitor the external environmental temperature, the radiation circulation cooling water storage module, indirect evaporative cooling tower, and chiller are controlled to switch on and off, realizing three operating modes of the cooling system and achieving energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1This is a schematic diagram of the principle of a cooling system combining indirect evaporative cooling and radiant cooling in the present invention;

[0013] Figure 2 This is a schematic diagram of the principle of an indirect evaporative cooling and radiant cooling cooling system in the present invention operating in the transition season;

[0014] Figure 3 This is a schematic diagram of the principle of an indirect evaporative cooling and radiant cooling cooling system in the present invention operating in winter;

[0015] Figure 4 It is a structural diagram of the radiation cooler in the utility model;

[0016] 10. Indirect evaporative cooling tower; 11. Cooling wet film; 12. Water receiving storage tank; 13. Water distributor; 14. Fan; 15. Cooling circulation pump; 17. Surface cooler; 18. Pre-cooling circulation pump; 20. Chiller; 30. Plate heat exchanger; 40. Radiant circulating cooling water storage module; 41. Water storage tank; 42. Radiant refrigeration circulating water pump; 43. Radiant cooler; 44. Radiant plate; 45. Heat transfer coil; 46. Insulation layer; 50. Terminal air conditioner; 60. Cold water supply pump; 70. Hot water return pump. DETAILED DESCRIPTION

[0017] 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.

[0018] 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.

[0019] 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.

[0020] like Figure 1 As shown, Figure 1Schematic diagram of the principle of a cooling system of indirect evaporative refrigeration and radiant refrigeration in the present invention; a cooling system of indirect evaporative refrigeration and radiant refrigeration, the cooling system includes an indirect evaporative cooling tower 10, a chiller 20, a plate heat exchanger 30, a radiant circulating cooling water storage module 40, a terminal air conditioner 50, a cold water supply pump 60, a hot water return pump 70 and a controller, the cooling water outlet end of the indirect evaporative cooling tower 10 is connected to the cold end inlet of the plate heat exchanger 30 through a pipeline, the cold end outlet of the plate heat exchanger 30 is connected to the condensation water inlet end of the chiller 20 through a pipeline, the condensation water outlet end of the chiller 20 is connected to the cooling water inlet end of the indirect evaporative cooling tower 10 through a pipeline; the water outlet end of the terminal air conditioner 50 is connected to the cold end inlet of the plate heat exchanger 30 through a pipeline The water inlet of the hot water return pump 70 is connected, and the water outlet of the hot water return pump 70 is connected to the water inlet of the radiation circulation cooling water storage module 40 through a pipeline. The water outlet of the radiation circulation cooling water storage module 40 is connected to the water inlet of the cold water supply pump 60 through a pipeline. The water outlet of the cold water supply pump 60 is connected to the hot end inlet of the plate heat exchanger 30 through a pipeline. The hot end outlet of the plate heat exchanger 30 is connected to the evaporation water inlet of the chiller 20 through a pipeline. The evaporation water outlet of the chiller 20 is connected to the water inlet of the terminal air conditioner 50 through a pipeline; the indirect evaporative cooling tower 10, the chiller 20, the radiation circulation cooling water storage module 30, the cold water supply pump 60, and the hot water return pump 70 are electrically connected to the controller.

[0021] This cooling system utilizes a hybrid of three cooling methods: indirect evaporative cooling, mechanical cooling, and radiative cooling. The system's controller controls the operating mode based on the ambient temperature. Indirect evaporative cooling involves the cooling tower using indirect evaporation to provide low-temperature cooling water, serving as a natural cooling source. Mechanical cooling involves the chiller using mechanical refrigeration to provide an even lower-temperature cooling source, cooling the cooling water to the system's desired temperature. Radiative cooling is based on classical thermodynamics, which states that all objects above absolute zero spontaneously radiate energy in the form of electromagnetic waves. Since the background temperature of outer space is close to absolute zero, it can be considered a vast renewable cooling source. Therefore, through thermal radiation, heat transfer between objects and outer space is nearly one-way, thereby reducing the temperature. Radiation primarily operates at night, generating and storing low-temperature water through radiative cooling, fully utilizing the natural cooling source. The entire cooling process only consumes the power of the water pump and produces water at least 10°C cooler than the ambient temperature, resulting in low energy consumption and high performance. In this system, a radiative circulating cooling water storage module is used to cool the stored water and exchange heat.

[0022] As for how the radiation circulation cooling water storage module realizes radiation refrigeration and cold source storage, preferably, the radiation circulation cooling water storage module 40 includes a water storage tank 41, a radiation refrigeration circulating water pump 42 and a radiation cooler 43. The water storage tank 41 has a hot water inlet, a cold water outlet, a hot water outlet and a cold water inlet. The hot water inlet is connected to the water outlet of the hot water return pump 70 through a pipe, and the cold water outlet is connected to the water inlet of the cold water supply pump 60 through a pipe. The hot water outlet is connected to the water inlet of the radiation refrigeration circulating water pump 42 through a pipe, and the water outlet of the radiation refrigeration circulating water pump 42 is connected to the water inlet of the radiation cooler 43 through a pipe, and the water outlet of the radiation cooler 43 is connected to the cold water inlet through a pipe.

[0023] The water tank is a large-capacity storage medium. During the day, low-temperature cooling water is output to the outside of the module from the cold water outlet at the bottom, and external high-temperature cooling water enters from the hot water inlet at the top. As the cold water in the water tank becomes less and less as the day goes by, most of the water stored in the water tank is hot water. At night, the hot water at the top is transported to the radiation cooler through the hot water outlet. The radiation cooler radiates heat into the air. After the cooling water is cooled, it enters the bottom of the water tank through the cold water inlet for storage. After one night, the low-temperature cooling water fills the entire water tank. Of course, the cooling water in the water tank needs to be used at night, and the flow rate to the radiation cooler can be increased.

[0024] How does the radiation cooler achieve radiation cooling? Figure 4 As shown, Figure 4 It is a structural schematic diagram of the radiation cooler in the present invention; preferably, the radiation cooler 43 includes a radiation plate 44, a heat-conducting coil 45, and an insulation layer 46. The water outlet of the heat-conducting coil 42 is connected to the cold water inlet through a pipe, and the water inlet of the heat-conducting coil 42 is connected to the hot water outlet through a pipe. The radiation plate 44 is fitted and connected to one side of the heat-conducting coil 45, and the insulation layer 46 is fitted and connected to the other side of the heat-conducting coil 45.

[0025] The radiant cooler consists of a radiant panel, a heat-conducting coil, and an insulation layer. The radiant panel can be coated with an acrylic paint containing 60% volume concentration of BaSO4, achieving a solar reflectivity of up to 98.1%. This paint also offers excellent reliability, ease of use, and compatibility with commercial paint manufacturing processes. High-temperature cooling water enters the heat-conducting coil, where it conducts heat to the radiant panel. The panel radiates the heat into the air, causing the water temperature to drop. The cooled water in the heat-conducting coil then returns to the storage tank.

[0026] Regarding how the indirect evaporative cooling tower uses natural cooling to prepare cooling water, preferably, the indirect evaporative cooling tower 10 includes a tower body, a cooling wet film 11, a water receiving tank 12, a water distributor 13, a fan 14, and a cooling circulation pump 15. The water receiving tank 12 is located at the bottom end of the tower body, the cooling wet film 11 is located above the water receiving tank 12, the water distributor 13 is located above the cooling wet film 11, the water inlet end of the cooling circulation pump 15 is connected to the water receiving tank 12 through a pipeline, the water outlet end of the cooling circulation pump 15 is connected to the cold end inlet of the plate heat exchanger 30 through a pipeline, and the fan 14 is located at the upper end of the tower body.

[0027] It sucks in external air to produce an isenthalpic process with the cooling wet film, causing the cooling water on the cooling wet film to evaporate and cool down, and then flow into the water receiving tank. The external hot water enters the water distributor and is sprayed on the cooling wet film.

[0028] In order to enable the indirect evaporative cooling tower to prepare cooling water with a lower temperature, preferably, the indirect evaporative cooling tower 10 also includes a surface cooler 17 and a pre-cooling circulation pump 18. The surface cooler 17 is located at the front end of the cooling wet film 11. The water inlet end of the surface cooler 17 is connected to the water outlet end of the pre-cooling circulation pump 18 through a pipeline. The water inlet end of the pre-cooling circulation pump 18 is connected to the cold water outlet through a pipeline. The water outlet end of the surface cooler 17 is connected to the hot water inlet through a pipeline.

[0029] The high-temperature air outside is cooled by the surface cooling heat exchange and enters the cooling wet film. As the air temperature drops, the cooling water on the cooling wet film evaporates and exchanges heat, and the temperature is further reduced.

[0030] The system operates in three modes. When the ambient temperature is detected to be higher than the first set value, such as 25°, it operates in the summer mode, such as Figure 1 As shown, Figure 1This is a schematic diagram of the principle of a cooling system combining indirect evaporative cooling and radiant cooling in the present invention. The indirect evaporative cooling tower, chiller, and radiant cooling circulating water pump are all in the on-state. After heat exchange, the chilled water in the terminal air conditioner is pumped to the top of the water storage tank by the hot water return pump for storage. The cooling water at the bottom of the storage tank is pumped to the plate heat exchanger by the cold water supply pump for initial heat exchange with the cooling water supplied by the indirect evaporative cooling tower. Because the water temperature in the water storage tank is higher than that of the cooling water supplied by the cooling tower, the water in the water storage tank is cooled by heat exchange. It then undergoes secondary heat exchange and cooling at the evaporative heat exchange end of the chiller before being supplied to the terminal air conditioner for heat exchange with the hot air in the space where the terminal air conditioner is located. After the temperature is increased, it is pumped to the top of the water storage tank by the hot water return pump, repeating the cycle. The radiant cooling circulating water pump is turned on at night, pumping the hotter cooling water at the top of the water storage tank to the radiant cooler. At night, the water radiates heat into the air and is returned to the bottom of the water storage tank after cooling, repeating the cycle. The cooling water from the indirect evaporative cooling tower is pumped to the plate heat exchanger by a cooling circulation pump. After heat exchange, it is sent to the chiller for heat exchange with the condensing heat exchange end. After further temperature increase, it is sent to the water inlet of the cooling tower, and the cycle continues. At the same time, the low-temperature cooling tower water in the water storage tank is pumped to the surface cooler by a pre-cooling circulation pump to pre-cool the external hot air through heat exchange.

[0031] When the ambient temperature is detected to be lower than the first set value, such as 25°, and higher than or equal to the second set value, such as 16°, it operates in the transition season mode, such as Figure 2 As shown, Figure 2 This is a schematic diagram of the principle of an indirect evaporative cooling and radiant cooling cooling system according to the present invention operating during the transition season. The radiant cooling circulating water pump is on, while the indirect evaporative cooling tower and chiller are off. The system uses only the cooling water in the water storage tank. After heat exchange, the chilled water in the terminal air conditioner is pumped to the top of the water storage tank by the hot water return pump for storage. The cooling water at the bottom of the storage tank is pumped by the cold water supply pump through the plate heat exchanger and the condensing heat exchange end of the chiller before returning to the terminal air conditioner. There, it exchanges heat with the hot air in the space where the terminal air conditioner is located. After heating, it is pumped back to the top of the water storage tank by the hot water return pump, repeating the cycle. The radiant cooling circulating water pump is turned on at night, pumping the hotter cooling water at the top of the water storage tank to the radiant cooler. During the night, it radiates heat into the air and, after cooling, is returned to the bottom of the water storage tank, repeating the cycle. During this entire period, only radiant cooling is required, significantly reducing system power consumption. Simultaneously, the cooler cooling tower water in the water storage tank is pumped to the surface cooler by the pre-cooling circulating pump to exchange heat with the external hot air for pre-cooling.

[0032] When the ambient temperature is detected to be lower than the second set value, such as 16°, it operates in winter mode, such as Figure 3 As shown, Figure 3This is a schematic diagram of the winter operation of a cooling system combining indirect evaporative cooling and radiant cooling, according to the present invention. The indirect evaporative cooling tower is in operation, while the radiant cooling circulating water pump and chiller are in operation. The system utilizes only cooling water from the indirect evaporative cooling tower. Chilled water from the terminal air conditioner undergoes heat exchange and is then pumped to the top of a water storage tank by a hot water return pump for storage. The warmer cooling water at the bottom of the storage tank is pumped through a plate heat exchanger by a cold water supply pump. There, it exchanges heat with cooling water from the indirect evaporative cooling tower. It then flows back through the chiller's condensation heat exchange end to the terminal air conditioner, where it exchanges heat with the hot air in the air conditioner's space. After heating, it is pumped back to the top of the water storage tank by a hot water return pump, repeating the cycle. During this entire period, only the indirect evaporative cooling tower is required, significantly reducing system power consumption. Simultaneously, the warmer cooling water from the storage tank is pumped to the surface cooler by a pre-cooling circulating pump, exchanging heat with the cold air outside. This prevents ice and frost from forming in the indirect evaporative cooling tower, which could affect its performance.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] By setting up a radiation circulation cooling water storage module, the system can realize radiation cooling and water storage at night, and release cold water to provide a cold source during the day; by setting up an indirect evaporative cooling tower, cooling water for the first exchange is provided, and by setting up a chiller, a cold source for the secondary cooling exchange is provided. By setting up a controller to monitor the external environmental temperature, the radiation circulation cooling water storage module, indirect evaporative cooling tower, and chiller are controlled to switch on and off, realizing three operating modes of the cooling system and achieving energy saving and consumption reduction.

[0035] The technical features of the above embodiments can be combined arbitrarily. 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.

[0036] 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. A cooling system combining indirect evaporative cooling and radiant cooling, characterized in that: The cooling system includes an indirect evaporative cooling tower, a chiller, a plate heat exchanger, a radiation circulation cooling water storage module, a terminal air conditioner, a cold water supply pump, a hot water return pump and a controller. The cooling water outlet of the indirect evaporative cooling tower is connected to the cold end inlet of the plate heat exchanger through a pipeline, and the cold end outlet of the plate heat exchanger is connected to the condensation water inlet of the chiller through a pipeline. The condensation water outlet of the chiller is connected to the cooling water inlet of the indirect evaporative cooling tower through a pipeline; the outlet of the terminal air conditioner is connected to the inlet of the hot water return pump through a pipeline, and the outlet of the hot water return pump is connected to the cooling water inlet of the indirect evaporative cooling tower through a pipeline. The pipeline is connected to the water inlet of the radiation circulation cooling water storage module, the water outlet of the radiation circulation cooling water storage module is connected to the water inlet of the cold water supply pump through a pipeline, the water outlet of the cold water supply pump is connected to the hot end inlet of the plate heat exchanger through a pipeline, the hot end outlet of the plate heat exchanger is connected to the evaporation water inlet of the chiller through a pipeline, and the evaporation water outlet of the chiller is connected to the water inlet of the terminal air conditioner through a pipeline; the indirect evaporative cooling tower, the chiller, the radiation circulation cooling water storage module, the cold water supply pump, the hot water return pump and the controller are electrically connected.

2. The cooling system of indirect evaporative cooling and radiant cooling according to claim 1, characterized in that: The radiation circulation cooling water storage module includes a water storage tank, a radiation refrigeration circulating water pump and a radiation cooler. The water storage tank has a hot water inlet, a cold water outlet, a hot water outlet and a cold water inlet. The hot water inlet is connected to the water outlet of the hot water return pump through a pipeline, and the cold water outlet is connected to the water inlet of the cold water supply pump through a pipeline. The hot water outlet is connected to the water inlet of the radiation refrigeration circulating water pump through a pipeline, and the water outlet of the radiation refrigeration circulating water pump is connected to the water inlet of the radiation cooler through a pipeline, and the water outlet of the radiation cooler is connected to the cold water inlet through a pipeline.

3. The cooling system of indirect evaporative cooling and radiant cooling according to claim 2, characterized in that: The radiation cooler includes a radiation plate, a heat-conducting coil, and an insulation layer. The water outlet of the heat-conducting coil is connected to the cold water inlet through a pipe, and the water inlet of the heat-conducting coil is connected to the hot water outlet through a pipe. The radiation plate is fitted and connected to one side of the heat-conducting coil, and the insulation layer is fitted and connected to the other side of the heat-conducting coil.

4. The cooling system of indirect evaporative cooling and radiant cooling according to claim 3, characterized in that: The indirect evaporative cooling tower includes a tower body, a cooling wet film, a water receiving tank, a water distributor, a fan, and a cooling circulation pump. The water receiving tank is located at the bottom end of the tower body, the cooling wet film is located above the water receiving tank, the water distributor is located above the cooling wet film, the water inlet end of the cooling circulation pump is connected to the water receiving tank through a pipeline, the water outlet end of the cooling circulation pump is connected to the cold end inlet of the plate heat exchanger through a pipeline, and the fan is located at the upper end of the tower body.

5. The cooling system of indirect evaporative cooling and radiant cooling according to claim 4, characterized in that: The indirect evaporative cooling tower also includes a surface cooler and a pre-cooling circulation pump. The surface cooler is located at the front end of the cooling wet film. The water inlet end of the surface cooler is connected to the water outlet end of the pre-cooling circulation pump through a pipeline. The water inlet end of the pre-cooling circulation pump is connected to the cold water outlet through a pipeline. The water outlet end of the surface cooler is connected to the hot water inlet through a pipeline.

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