Dual refrigeration system

Abstract

The utility model discloses a dual refrigeration system, and relates to the technical field of machine room cooling, the dual refrigeration system comprises an evaporative condensation phase change device and an evaporative air handling unit, and the evaporative condensation phase change device can compress and exchange heat input gaseous working media into liquid working media and then output the liquid working media. The evaporative air conditioning box comprises a box body, a phase change heat exchange assembly and an air-air heat exchanger, the air-air heat exchanger can achieve heat exchange of air in an indoor air duct and an outdoor air duct, and the phase change heat exchange assembly is connected with the evaporative condensation phase change device and can conduct heat exchange on an input liquid working medium and air to form a gaseous working medium to be output. And the air subjected to heat exchange by the air-air heat exchanger is cooled. Compared with the prior art, the centralized evaporation and condensation working medium phase change device is combined with the evaporative air conditioning box, the phase change cold supplement mode is large in refrigerating capacity and high in energy efficiency, the stable refrigerating function can be achieved under the climate with the extremely high wet bulb temperature, and the refrigerating requirement of a machine room is met.

Description

Technical Field

[0001] This utility model relates to the field of computer room cooling technology, and more specifically, to a dual cooling system. Background Technology

[0002] Currently, evaporative air conditioning units are widely used in data center temperature control. The current supplementary cooling method for evaporative air conditioning units (providing supplementary cooling when evaporative cooling is insufficient to meet the cooling needs of the computer room) involves internally equipping split-type air-cooled air conditioners. However, in climates with extremely high wet-bulb temperatures, the cooling capacity of evaporative air conditioning units is insufficient, and their energy efficiency is low (the energy efficiency ratio (EER) of split-type air conditioners is generally in the range of 2.0 to 3.0), making it difficult to meet the cooling needs of data center computer rooms. Utility Model Content

[0003] The purpose of this invention is to provide a dual refrigeration system that combines a centralized evaporative condenser phase change system with an evaporative air conditioning unit to achieve supplementary refrigeration. This supplementary refrigeration method has a large refrigeration capacity, can achieve stable refrigeration function, greatly improves refrigeration capacity, and meets the refrigeration needs of computer rooms.

[0004] The embodiments of this utility model are implemented as follows:

[0005] On one hand, this utility model embodiment provides a dual refrigeration system, including:

[0006] An evaporative condensation phase change device is configured to compress and heat the input gaseous working fluid into a liquid working fluid before outputting it.

[0007] An evaporative air conditioning unit, wherein the evaporative air conditioning unit and the evaporative condensing phase change device are separately configured, includes a housing, a phase change heat exchange component, and an air-to-air heat exchanger. The housing is provided with an indoor air duct connecting to an indoor space and an outdoor air duct connecting to an outdoor space. The air-to-air heat exchanger is disposed in the housing and configured to realize heat exchange between the air in the indoor air duct and the outdoor air duct. The phase change heat exchange component is disposed in the housing, at least partially disposed at the air outlet of the indoor air duct, and connected to the evaporative condensing phase change device. It is configured to exchange heat between the input liquid working fluid and the air, converting it into a gaseous working fluid, and then outputting it to cool the air after heat exchange with the air-to-air heat exchanger.

[0008] In an optional embodiment, the evaporative condensing phase change device includes a working fluid reflux pipe, a working fluid liquid supply pipe, an evaporative condenser, and a phase change compressor. One end of the working fluid reflux pipe is connected to the phase change heat exchange assembly, and the other end is connected to the phase change compressor. It is configured to deliver the gaseous working fluid output from the phase change heat exchange assembly to the phase change compressor. The phase change compressor is connected to the evaporative condenser and is configured to compress the gaseous working fluid. The evaporative condenser is configured to exchange heat between the gaseous working fluid and the liquid working fluid. One end of the working fluid liquid supply pipe is connected to the evaporative condenser, and the other end is connected to the phase change heat exchange assembly. It is configured to deliver the liquid working fluid output from the evaporative condenser to the phase change heat exchange assembly.

[0009] In an optional embodiment, the evaporative condenser phase change device further includes a nozzle and a spray pipe, the spray pipe being connected to the nozzle and configured to deliver cooling water to the nozzle, the nozzle being disposed above the evaporative condenser and configured to spray cooling water onto the evaporative condenser.

[0010] In an optional embodiment, the evaporative condensation phase change device further includes a water receiving tray, a spray pump, and a first water supply pipe. The water receiving tray is disposed below the evaporative condenser and is configured to receive cooling water dripping from the evaporative condenser. The two ends of the spray pipe are respectively connected to the water receiving tray and the spray nozzle. The spray pump is disposed on the spray pipe. The first water supply pipe is connected to the water receiving tray and is configured to replenish cooling water into the water receiving tray.

[0011] In an optional embodiment, the water receiving tray is further provided with a first liquid level sensor for detecting the liquid level, and the first water supply pipe is provided with a first water supply electric valve. The first water supply electric valve is communicatively connected to the first liquid level sensor and is configured to open or close the first water supply pipe according to the liquid level of the water receiving tray.

[0012] In an optional embodiment, the evaporative condensing phase change device further includes a condensing fan disposed above the evaporative condenser and configured to blow air onto the evaporative condenser.

[0013] In an optional embodiment, the phase change heat change assembly includes a heat exchange coil, a throttling valve, a blower, a working fluid inlet pipe, and a working fluid outlet pipe. The heat exchange coil and the blower are spaced apart within the housing and located at the air outlet end of the indoor air duct. The two ends of the working fluid inlet pipe are respectively connected to the evaporative condensing phase change device and the heat exchange coil. The two ends of the working fluid outlet pipe are respectively connected to the evaporative condensing phase change device and the heat exchange coil. The throttling valve is disposed on the working fluid inlet pipe.

[0014] In an optional embodiment, the evaporative air conditioning unit further includes a water circulation cooling assembly and an exhaust fan. The water circulation cooling assembly is disposed inside the unit and at least partially disposed at the air inlet end of the outdoor air duct, and is configured to cool the air entering the air-to-air heat exchanger. The exhaust fan is disposed at the air outlet end of the outdoor air duct.

[0015] In an optional embodiment, the water circulation cooling assembly includes a cooling wet film and a water supply pipe. The cooling wet film is disposed inside the housing and located at the air inlet of the outdoor air duct, and is configured to cool the air entering the air-to-air heat exchanger. The water supply pipe is connected to the top of the cooling wet film and is configured to supply water to the cooling wet film.

[0016] In an optional embodiment, the water circulation cooling assembly further includes a water tank, a return water pipe, a circulation pump, and a second water supply pipe. The water tank is disposed within the tank body. One end of the return water pipe is connected to the bottom end of the cooling wet film, and the other end is connected to the water tank. The end of the water supply pipe away from the cooling wet film is connected to the water tank. The circulation pump is disposed on the water supply pipe, and the second water supply pipe is connected to the water tank and configured to replenish water to the water tank.

[0017] In an optional embodiment, the water tank is further provided with a second liquid level sensor for detecting the liquid level, and the second water supply pipe is provided with a second water supply electric valve. The second water supply electric valve is communicatively connected to the second liquid level sensor and is configured to open or close the second water supply pipe according to the liquid level of the water tank.

[0018] In an optional embodiment, the dual refrigeration system further includes a first loop network and a second loop network. There are multiple evaporative condensing phase change devices and multiple evaporative air conditioning units. The input terminals of multiple evaporative condensing phase change devices are simultaneously connected to the first loop network, the output terminals of multiple evaporative condensing phase change devices are simultaneously connected to the second loop network, the input terminals of multiple phase change heat exchange components are simultaneously connected to the second loop network, and the output terminals of multiple phase change heat exchange components are simultaneously connected to the first loop network.

[0019] The beneficial effects of this utility model embodiment are:

[0020] The dual refrigeration system provided in this embodiment of the invention includes an indoor air duct and an outdoor air duct within the housing. An air-to-air heat exchanger is installed inside the housing, enabling heat exchange between the air in the indoor and outdoor air ducts. A phase change heat exchange component is located at the air outlet of the indoor air duct and connected to an evaporative condensing phase change device. On one hand, outdoor cold air and indoor hot air exchange heat through the air-to-air heat exchanger, achieving primary refrigeration. On the other hand, the liquid refrigerant first exchanges heat with the air in the indoor air duct to form a gaseous refrigerant, which carries away heat and further cools the indoor air cooled by the air-to-air heat exchanger, achieving secondary refrigeration. The gaseous refrigerant after heat exchange is then compressed and heat-exchanged by the external evaporative condensing phase change device to form a liquid refrigerant, which is then circulated to the phase change heat exchange component. Compared to existing technologies, this utility model combines a centralized evaporative condensing working fluid phase change system with an evaporative air conditioning unit, and the supplementary cooling method is a centralized evaporative condensing working fluid phase change system. This supplementary cooling method has a large cooling capacity and high energy efficiency, and can achieve stable cooling function in climates with extremely high wet-bulb temperatures, thus meeting the cooling needs of the computer room. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an overall schematic diagram of the dual refrigeration system provided in an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 Schematic diagram of a medium-sized evaporative condensation phase change device;

[0024] Figure 3 for Figure 2 Schematic diagram of the distribution structure of the central spray assembly;

[0025] Figure 4 for Figure 1 Schematic diagram of the structure of a medium-sized evaporative air conditioning unit;

[0026] Figure 5 for Figure 4 Schematic diagram of the distribution structure of the intermediate phase transformation heat transfer assembly;

[0027] Figure 6 for Figure 4 Schematic diagram of the distribution structure of the water circulation cooling assembly.

[0028] icon:

[0029] 10-Dual refrigeration system; 100-Evaporative condenser phase change device; 110-Working fluid return pipe; 120-Working fluid supply pipe; 130-Evaporative condenser; 140-Phase change compressor; 150-Spray assembly; 151-Spray head; 152-Spray pipe; 153-Water tray; 154-Spray pump; 155-First water supply pipe; 156-First liquid level sensor; 157-First water supply electric valve; 160-Condenser fan; 200-Evaporative air conditioning unit; 210-Unit; 211-Indoor air duct; 212-Outdoor air duct; 213-Outdoor air inlet; 214-Outdoor air outlet; 21 5-Indoor air inlet; 216-Indoor air outlet; 217-Internal ventilation opening; 220-Phase change heat exchanger; 221-Heat exchange coil; 222-Throttle valve; 223-Blower; 224-Working fluid inlet pipe; 225-Working fluid outlet pipe; 230-Air-to-air heat exchanger; 240-Water circulation cooling assembly; 241-Cooling wet film; 242-Water supply pipe; 243-Water tank; 244-Return water pipe; 245-Circulation pump; 246-Second water supply pipe; 247-Second liquid level sensor; 248-Second water supply electric valve; 250-Exhaust fan; 300-First ring network piping; 400-Second ring network piping. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] As disclosed in the background section, current evaporative air conditioning units provide supplementary cooling when evaporative cooling is insufficient to meet the cooling needs of the computer room. The actual supplementary cooling method is to install split-type air-cooled air conditioners inside. In climates with extremely high wet-bulb temperatures, this supplementary cooling method will result in insufficient cooling capacity and low energy efficiency of the evaporative air conditioning unit (the energy efficiency ratio (EER) of split-type air conditioners is generally in the range of 2.0-3.0), making it difficult to meet the cooling needs of the data center computer room.

[0037] To address the aforementioned issues, this invention proposes a novel dual-cooling system that combines a centralized evaporative condensing refrigerant phase change system with an evaporative air conditioning unit. The supplementary cooling method is a centralized evaporative condensing refrigerant phase change system. This supplementary cooling method has a large cooling capacity and high energy efficiency (EER range of 4.0-8), and can achieve stable cooling function even in climates with extremely high wet-bulb temperatures, meeting the cooling needs of computer rooms.

[0038] The dual refrigeration system will be described in detail below. It is worth noting that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0039] See Figure 1 and Figure 4 This utility model embodiment provides a dual refrigeration system 10, which can combine a centralized evaporative condenser phase change system with an evaporative air conditioning unit 200 to achieve supplementary refrigeration. This supplementary refrigeration method has a large refrigeration capacity, can achieve stable refrigeration function, greatly improve refrigeration capacity, and meet the refrigeration needs of the computer room.

[0040] The dual refrigeration system 10 provided in this embodiment of the present invention includes an evaporative condensing phase change device 100 and an evaporative air conditioning unit 200. The evaporative air conditioning unit 200 and the evaporative condensing phase change device 100 are separately arranged, and the evaporative condensing phase change device 100 is configured to compress and heat the input gaseous working fluid into a liquid working fluid before outputting it.

[0041] The evaporative air conditioning unit 200 includes a housing 210, a phase change heat exchanger 220, and an air-to-air heat exchanger 230. The housing 210 is provided with an indoor air duct 211 that connects to an indoor space and an outdoor air duct 212 that connects to an outdoor space. The air-to-air heat exchanger 230 is disposed in the housing 210 and is configured to realize heat exchange between the indoor air duct 211 and the outdoor air duct 212. The phase change heat exchanger 220 is disposed in the housing 210 and is at least partially disposed at the air outlet of the indoor air duct 211. It is connected to the evaporative condensing phase change device 100 and is configured to exchange heat between the input liquid working fluid and the air to a gaseous working fluid before outputting it to cool the air after heat exchange with the air-to-air heat exchanger 230.

[0042] During actual cooling, on the one hand, outdoor cold air and indoor hot air exchange heat through the air-to-air heat exchanger 230, thus achieving primary cooling to meet conditions with lower cooling demands. When cooling demand is higher, the liquid refrigerant first exchanges heat with the air in the indoor air duct 211 to form a gaseous refrigerant, which carries away heat and further cools the indoor air cooled by the air-to-air heat exchanger 230, achieving secondary cooling. The gaseous refrigerant after heat exchange is then compressed and heat-exchanged by the external evaporative condenser phase change device 100 to form a liquid refrigerant, which then circulates to the phase change heat exchange component 220. This refrigerant phase change provides supplementary cooling and secondary cooling of the circulating indoor air, significantly improving cooling capacity and meeting the cooling needs of the computer room.

[0043] It should be noted that the working fluid mentioned in this embodiment can be a refrigerant, such as R12, R22, R134a, R407c, R410a, R290, R32 or water, etc.

[0044] See Figure 2 and Figure 3 In some embodiments, the evaporative condensing phase change device 100 includes a working fluid return pipe 110, a working fluid supply pipe 120, an evaporative condenser 130, and a phase change compressor 140. One end of the working fluid return pipe 110 is connected to the phase change heat exchange assembly 220, and the other end is connected to the phase change compressor 140. It is configured to deliver the gaseous working fluid output from the phase change heat exchange assembly 220 to the phase change compressor 140. The phase change compressor 140 is connected to the evaporative condenser 130 and is configured to compress the gaseous working fluid. The evaporative condenser 130 is configured to exchange heat between the gaseous working fluid and the liquid working fluid. One end of the working fluid supply pipe 120 is connected to the evaporative condenser 130, and the other end is connected to the phase change heat exchange assembly 220. It is configured to deliver the liquid working fluid output from the evaporative condenser 130 to the phase change heat exchange assembly 220. Specifically, the working fluid return pipe 110 supplies low-pressure gaseous working fluid to the phase change compressor 140. This low-pressure gaseous working fluid is formed after secondary refrigeration and heat exchange with air by the phase change heat exchange component 220. The phase change compressor 140 provides circulation power for the phase change working fluid and increases its pressure, compressing the low-pressure working fluid into a high-pressure working fluid. The evaporative condenser 130 is connected to the phase change compressor 140 via a pipe, enabling the internal transformation of the gaseous working fluid into a liquid working fluid, outputting a high-pressure liquid working fluid. Externally, it exchanges heat and mass with external air, thereby removing the heat generated by internal condensation. The working fluid supply pipe 120 supplies high-pressure liquid working fluid to the phase change heat exchange component 220, facilitating throttling refrigeration by the phase change heat exchange component 220.

[0045] Furthermore, the evaporative condensation phase change device 100 also includes a spray assembly 150, which includes a nozzle 151 and a spray pipe 152. The spray pipe 152 is connected to the nozzle 151 and configured to supply cooling water to the nozzle 151. The nozzle 151 is positioned above the evaporative condenser 130 and configured to spray cooling water onto the evaporative condenser 130. Specifically, there can be multiple nozzles 151, which are evenly distributed above the evaporative condenser, while the spray pipe 152 provides cooling water. The multiple nozzles 151 can spray cooling water onto the evaporative condenser 130, allowing heat exchange between the outside of the evaporative condenser 130 and the cooling water, further removing the heat generated by internal condensation and ensuring effective heat exchange.

[0046] It should be noted that in this embodiment, multiple nozzles 151 can uniformly spray the surface of the evaporative condenser 130 of the cooling water channel, thereby fully cooling the evaporative condenser 130 and further promoting heat exchange between the working fluid and the cooling water inside the evaporative condenser 130, thus fully removing the heat generated by internal condensation.

[0047] In some embodiments, the spray assembly 150 further includes a water receiving tray 153, a spray pump 154, and a first water supply pipe 155. The water receiving tray 153 is disposed below the evaporative condenser 130 and configured to receive cooling water dripping from the evaporative condenser 130. The two ends of the spray pipe 152 are connected to the water receiving tray 153 and the spray nozzles 151, respectively. The spray pump 154 ​​is disposed on the spray pipe 152. The first water supply pipe 155 is connected to the water receiving tray 153 and configured to replenish cooling water into the water receiving tray 153. The water receiving tray 153 is correspondingly disposed to multiple spray nozzles 151, thereby fully catching the water sprayed from the spray nozzles 151 and the cooling water dripping from the evaporative condenser 130. Simultaneously, the water receiving tray 153 can temporarily store cooling water for cooling. The cooled water can be pumped back to the multiple spray nozzles 151 via the spray pump 154 ​​and the spray pipe 152, realizing the recycling of cooling water. Furthermore, since some of the cooling water evaporates when it exchanges heat with the evaporative condenser 130, long-term use will lead to a reduction in the cooling water in the water tray 153. Therefore, the cooling water can be replenished through the first water supply pipe 155 to ensure the normal operation of the spray assembly 150.

[0048] Furthermore, a first liquid level sensor 156 for detecting the liquid level is also installed inside the water receiving tray 153, and a first water supply electric valve 157 is installed on the first water supply pipe 155. The first water supply electric valve 157 is communicatively connected to the first liquid level sensor 156 and is configured to open or close the first water supply pipe 155 according to the liquid level in the water receiving tray 153. The first liquid level sensor 156 can detect the liquid level in the water receiving tray 153. When the liquid level is below a certain value, the first water supply electric valve 157 can be opened to replenish water; when the liquid level is above a certain value, the first water supply electric valve 157 can be closed to stop water replenishment. For the detection principle and structure of the first liquid level sensor 156, refer to existing liquid level sensors.

[0049] In some embodiments, the evaporative condenser phase change device 100 further includes a condenser fan 160, which is disposed above the evaporative condenser 130 and configured to blow air onto the evaporative condenser 130. Specifically, the condenser fan 160 can blow air onto the evaporative condenser 130, thereby blowing surrounding cold air toward the evaporative condenser 130 to achieve heat exchange between the air and the evaporative condenser 130. In addition, in conjunction with the spray assembly 150, the condenser fan 160 can promote the evaporation of cooling water, further enhancing the cooling capacity of the cooling water, thereby effectively removing the heat generated by condensation inside the evaporative condenser 130.

[0050] Please continue reading Figures 4 to 6In some embodiments, the phase change heat exchange assembly 220 includes a heat exchange coil 221, a throttle valve 222, a blower 223, a working fluid inlet pipe 224, and a working fluid outlet pipe 225. The heat exchange coil 221 and the blower 223 are spaced apart within the housing 210 and located at the air outlet end of the indoor air duct 211. The two ends of the working fluid inlet pipe 224 are respectively connected to the working fluid supply pipe 120 and the heat exchange coil 221. The two ends of the working fluid outlet pipe 225 are respectively connected to the working fluid return pipe 110 and the heat exchange coil 221. The throttle valve 222 is installed on the working fluid inlet pipe 224. Specifically, the working fluid in the heat exchange coil 221 changes from a liquid state to a gaseous state, realizing heat exchange between the phase change working fluid and the air in the indoor air duct 211, thereby reducing the air temperature. The blower 223 provides power for the airflow within the indoor duct 211, and located at the outlet of the heat exchange coil 221, it accelerates the exhaust of cooled air into the room. The throttle valve 222 converts the high-pressure working fluid into a low-pressure working fluid. The working fluid is delivered to the heat exchange coil 221 via the working fluid inlet pipe 224, i.e., the working fluid in the working fluid supply pipe 120 is delivered to the heat exchange coil 221. The working fluid is then delivered to the return side of the phase change compressor 140 via the working fluid outlet pipe 225, i.e., to the working fluid return pipe 110. The air-to-air heat exchanger 230 enables heat exchange between indoor and outdoor air.

[0051] Furthermore, the evaporative air conditioning unit 200 also includes a water circulation cooling assembly 240 and an exhaust fan 250. The water circulation cooling assembly 240 is disposed within the housing 210 and at least partially disposed at the air inlet of the outdoor air duct 212, configured to cool the air entering the air-to-air heat exchanger 230. The exhaust fan 250 is disposed at the air outlet of the outdoor air duct 212. Specifically, the water circulation cooling assembly 240 enables water cooling of the air in the outdoor duct, thereby further cooling the air entering the air-to-air heat exchanger 230, thereby improving the heat exchange capacity of the air-to-air heat exchanger 230 and further reducing the temperature of the air after heat exchange in the indoor air duct. The exhaust fan 250 provides power for the circulation of outdoor air.

[0052] The water circulation cooling assembly 240 includes a cooling wet film 241 and a water supply pipe 242. The cooling wet film 241 is disposed inside the housing 210 and located at the air inlet of the outdoor air duct 212. It is configured to cool the air entering the air-to-air heat exchanger 230. The water supply pipe 242 is connected to the top of the cooling wet film 241 and is configured to supply water to the cooling wet film 241. Specifically, after the water flows through the cooling wet film 241, it exchanges heat with the air flowing through it, thereby lowering the air temperature. The water supply pipe 242 supplies water to the top of the cooling wet film 241, ensuring a continuous flow of water to the cooling wet film 241.

[0053] Furthermore, the water circulation cooling assembly 240 also includes a water tank 243, a return water pipe 244, a circulation pump 245, and a second water supply pipe 246. The water tank 243 is disposed inside the housing 210. One end of the return water pipe 244 is connected to the bottom end of the cooling wet film 241, and the other end is connected to the water tank 243. The end of the supply water pipe 242 away from the cooling wet film 241 is connected to the water tank 243. The circulation pump 245 is disposed on the supply water pipe 242. The second water supply pipe 246 is connected to the water tank 243 and is configured to replenish water to the water tank 243. The return water pipe 244, water tank 243, circulation pump 245, supply water pipe 242, and cooling wet film 241 can form a water circulation loop to achieve circulating cooling. The water tank 243 can collect water flowing through the cooling wet film 241 through the return water pipe 244, the circulation pump 245 can provide power for water circulation, and the second water supply pipe 246 can replenish water to the water tank 243.

[0054] In some embodiments, a second liquid level sensor 247 for detecting the liquid level is also provided inside the water tank 243, and a second water supply electric valve 248 is provided on the second water supply pipe 246. The second water supply electric valve 248 is communicatively connected to the second liquid level sensor 247 and is configured to open or close the second water supply pipe 246 according to the liquid level in the water tank 243. Specifically, the second liquid level sensor 247 can detect the liquid level in the water tank 243. When the liquid level is lower than a certain value, the second water supply electric valve 248 can be opened to replenish water, and when the liquid level is higher than a certain value, the second water supply electric valve 248 can be closed to stop replenishing water. For the detection principle and structure of the second liquid level sensor 247, refer to existing liquid level sensors.

[0055] It is worth noting that in this embodiment of the utility model, the housing 210 is provided with multiple ventilation openings, and an indoor air duct 211 and an outdoor air duct 212 are provided inside. The indoor air duct 211 and the outdoor air duct 212 are separated from each other. The housing 210 is divided into an upper chamber and a lower chamber. The upper chamber can form the outdoor air duct 212, and the upper chamber and the lower chamber can form the indoor air duct 211. The two ends of the upper chamber are the outdoor air inlet 213 and the outdoor air outlet 214 of the outdoor air duct 212, respectively. The upper end of the upper chamber is the indoor air inlet 215, and one end of the lower chamber is the indoor air outlet 216. At the same time, the indoor air duct 211 extends from the upper chamber to the lower chamber, and the space between the upper chamber and the lower chamber is the internal ventilation opening 217. Furthermore, in order to prevent excessive pressure expansion in the indoor air duct 211, a baffle is installed on the side of the internal vent 217 away from the indoor air outlet 216, which can guide the flow of indoor air.

[0056] In some embodiments, the dual refrigeration system 10 further includes a first loop network 300 and a second loop network 400. Multiple evaporative condensing phase change devices 100 and multiple evaporative air conditioning units 200 are included. The input terminals of the multiple evaporative condensing phase change devices 100 are simultaneously connected to the first loop network 300, and the output terminals of the multiple evaporative condensing phase change devices 100 are simultaneously connected to the second loop network 400. The input terminals of the multiple phase change heat exchange components 220 are simultaneously connected to the second loop network 400, and the output terminals of the multiple phase change heat exchange components 220 are simultaneously connected to the first loop network 300. Specifically, the number of evaporative condensing phase change devices 100 can be N, and the number of evaporative air conditioning units 200 can be M. N and M can be the same or different. In this embodiment, N and M are both 2 for illustrative purposes. Among them, multiple evaporative condensing phase change devices 100 are connected in parallel to the first ring network pipeline 300 and the second ring network pipeline 400, and multiple evaporative air conditioning units 200 are also connected in parallel to the first ring network pipeline 300 and the second ring network pipeline 400.

[0057] It should be noted that the working fluid supply pipe 120 of the evaporative condensing phase change device 100 is connected to the second ring network pipe 400, the working fluid return pipe 110 is connected to the first ring network pipe 300, the working fluid inlet pipe 224 of the evaporative air conditioning unit 200 is connected to the second ring network pipe 400, and the working fluid outlet pipe 225 is connected to the first ring network pipe 300.

[0058] The dual refrigeration system 10 provided in this embodiment of the utility model has the following three working modes:

[0059] 1) Air-to-air heat exchanger 230 refrigeration method.

[0060] When the outdoor dry-bulb temperature is lower than T1, the supply fan 223 and the exhaust fan 250 are started. The indoor high-temperature air and the outdoor low-temperature air flow in from the indoor air inlet 215 and the outdoor air inlet 213 respectively to exchange heat. After the indoor high-temperature air flows through the air-to-air heat exchanger 230, it becomes low-temperature air and is delivered to the computer room to achieve cooling of the computer room.

[0061] 2) Cooling method using a cooling wet film 241 and an air-to-air heat exchanger 230.

[0062] When the outdoor dry-bulb temperature is higher than T1 and the wet-bulb temperature is lower than T2, the supply fan 223 and exhaust fan 250 are started, and the circulating water pump is started. The outdoor air first passes through the cooling wet film 241. After heat and moisture exchange with the cooling wet film 241, the outdoor air is reduced to a temperature close to the outdoor wet-bulb temperature. Then, the cooled outdoor air exchanges heat with the high-temperature indoor air in the air-to-air heat exchanger 230, carrying away the heat from the high-temperature indoor air. The indoor air temperature is reduced and delivered to the computer room to achieve cooling of the computer room.

[0063] 3) Cooling wet film 241, air-to-air heat exchanger 230 and evaporative condensation phase change system are used as supplementary refrigeration methods.

[0064] When the outdoor dry-bulb temperature is higher than T1 and the wet-bulb temperature is higher than T2, the blower 223 and exhaust fan 250 start, and the circulating water pump starts. At the same time, the evaporative condensation working fluid phase change device starts to produce high-pressure liquid working fluid. The high-pressure working fluid enters the heat exchange coil 221 through the throttle valve 222 to achieve evaporative cooling. Specifically, the outdoor air first passes through the cooling wet film 241. After heat and moisture exchange with the cooling wet film 241, the outdoor air temperature drops to close to the outdoor air wet-bulb temperature. Then, the cooled outdoor air exchanges heat with the high-temperature indoor air in the air-to-air heat exchanger 230, carrying away the heat from the high-temperature indoor air. The indoor air temperature undergoes the first stage of cooling, i.e., primary cooling (because the outdoor air wet-bulb temperature is high, the indoor air temperature at this time still does not meet the cooling requirements of the computer room). Then, it flows through the heat exchange coil 221 and exchanges heat with the low-temperature heat exchange coil 221. The indoor air temperature undergoes the second stage of cooling, i.e., secondary cooling, before being delivered to the computer room to achieve cooling of the computer room.

[0065] In summary, the dual refrigeration system 10 provided in this embodiment of the present invention includes an indoor air duct 211 and an outdoor air duct 212 within a housing 210. An air-to-air heat exchanger 230 is located within the housing 210 and enables heat exchange between the air in the indoor air duct 211 and the outdoor air duct 212. A phase change heat exchange component 220 is partially located at the air outlet of the indoor air duct 211 and connected to the evaporative condensing phase change device 100. On one hand, outdoor cold air and indoor hot air exchange heat through the air-to-air heat exchanger 230, achieving primary refrigeration. The liquid refrigerant first exchanges heat with the air in the indoor air duct 211 to form a gaseous refrigerant, which carries away heat and further cools the indoor air cooled by the air-to-air heat exchanger 230, achieving secondary refrigeration. The gaseous refrigerant after heat exchange is then compressed and heat-exchanged by the external evaporative condensing phase change device 100 to form a liquid refrigerant, which is then circulated to the phase change heat exchange component 220. Compared to existing technologies, this utility model embodiment combines a centralized evaporative condensing working fluid phase change system with an evaporative air conditioning unit 200, and the supplementary cooling method is a centralized evaporative condensing working fluid phase change system. This supplementary cooling method has a larger cooling capacity and higher energy efficiency, and can achieve stable cooling function in climates with extremely high wet-bulb temperatures, thus meeting the cooling needs of the computer room.

[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dual refrigeration system, characterized by, The application relates to an evaporative condensation phase change device (100) configured to compress and exchange heat of input gaseous working medium into liquid working medium and output the liquid working medium; and an evaporative air conditioning box (200) which is separately arranged from the evaporative condensation phase change device (100) and comprises a box body (210), a phase change heat exchange assembly (220) and an air-air heat exchanger (230), wherein the box body (210) is internally provided with an indoor air duct (211) communicated with an indoor space and an outdoor air duct (212) communicated with an outdoor space, the air-air heat exchanger (230) is arranged in the box body (210) and is configured to exchange heat of air in the indoor air duct (211) and the outdoor air duct (212), the phase change heat exchange assembly (220) is arranged in the box body (210) and is arranged at a discharge end of the indoor air duct (211) and connected with the evaporative condensation phase change device (100), and is configured to exchange heat of input liquid working medium with air into gaseous working medium and output the gaseous working medium to cool air exchanged by the air-air heat exchanger (230). The evaporative condensation phase change device (100) comprises a working medium return pipeline (110), a working medium liquid supply pipeline (120), an evaporative condenser (130) and a phase change compressor (140), one end of the working medium return pipeline (110) is connected to the phase change heat exchange assembly (220), the other end is connected to the phase change compressor (140), and the working medium return pipeline (110) is configured to deliver gaseous working medium output by the phase change heat exchange assembly (220) to the phase change compressor (140); the phase change compressor (140) is connected with the evaporative condenser (130), the phase change compressor (140) is configured to compress the gaseous working medium, and the evaporative condenser (130) is configured to exchange heat of the gaseous working medium into liquid working medium; one end of the working medium liquid supply pipeline (120) is connected to the evaporative condenser (130), the other end is connected to the phase change heat exchange assembly (220), and the working medium liquid supply pipeline (120) is configured to deliver liquid working medium output by the evaporative condenser (130) to the phase change heat exchange assembly (220). The evaporative condensation phase change device (100) further comprises a spraying assembly (150) which comprises a spray head (151) and a spraying pipe (152), the spraying pipe (152) is connected to the spray head (151) and is configured to deliver cooling water to the spray head (151), and the spray head (151) is arranged above the evaporative condenser (130) and is configured to spray cooling water to the evaporative condenser (130).

2. The dual refrigerant system of claim 1 wherein, ​ 3. The dual refrigerant system of claim 2 wherein, ​ 4. The dual refrigerant system of claim 3 wherein, The spray assembly (150) further comprises a water pan (153), a spray pump (154) and a first water supplement pipe (155), the water pan (153) is arranged below the evaporative condenser (130) and is configured to receive the cooling water dripped from the evaporative condenser (130), two ends of the spray pipe (152) are connected to the water pan (153) and the spray head (151) respectively, the spray pump (154) is arranged on the spray pipe (152), and the first water supplement pipe (155) is connected to the water pan (153) and is configured to supplement the cooling water in the water pan (153).

5. The dual refrigerant system of claim 4 wherein, A first liquid level sensor (156) for detecting the liquid level is further arranged in the water pan (153), a first water supplement electric valve (157) is arranged on the first water supplement pipe (155), the first water supplement electric valve (157) is in communication connection with the first liquid level sensor (156) and is configured to turn on or cut off the first water supplement pipe (155) according to the liquid level of the water pan (153).

6. The dual refrigerant system of claim 2 or 3, wherein, The evaporative condensation phase change device (100) further comprises a condensation fan (160), and the condensation fan (160) is arranged above the evaporative condenser (130) and is configured to blow air to the evaporative condenser (130).

7. The dual refrigerant system of claim 1 or 2, wherein, The phase change heat exchange assembly (220) comprises heat exchange coils (221), a throttling valve (222), a supply fan (223), a working medium inlet pipe (224) and a working medium outlet pipe (225), the heat exchange coils (221) and the supply fan (223) are arranged in the cabinet (210) at intervals and are located at an air outlet end of the indoor air duct (211), two ends of the working medium inlet pipe (224) are connected to the evaporative condensation phase change device (100) and the heat exchange coils (221) respectively, two ends of the working medium outlet pipe (225) are connected to the evaporative condensation phase change device (100) and the heat exchange coils (221) respectively, and the throttling valve (222) is arranged on the working medium inlet pipe (224).

8. The dual refrigerant system of claim 1 or 2, wherein, The evaporative air conditioning cabinet (200) further comprises a water circulation cooling assembly (240) and an exhaust fan (250), the water circulation cooling assembly (240) is arranged in the cabinet (210) and is at least partially arranged at an air inlet end of the outdoor air duct (212) and is configured to cool the air entering the air-air heat exchanger (230), and the exhaust fan (250) is arranged at an air outlet end of the outdoor air duct (212).

9. The dual refrigerant system of claim 8, wherein, The water circulation cooling assembly (240) comprises a cooling wet membrane (241) and a water supply pipe (242), the cooling wet membrane (241) is arranged in the cabinet (210) and is located at the air inlet end of the outdoor air duct (212) and is configured to cool the air entering the air-air heat exchanger (230), and the water supply pipe (242) is connected to a top end of the cooling wet membrane (241) and is configured to supply water to the cooling wet membrane (241).

10. The dual refrigerant system of claim 9, wherein, The water circulation cooling assembly (240) further comprises a water tank (243), a return water pipe (244), a circulating pump (245) and a second water supplement pipe (246), the water tank (243) is arranged in the box (210), one end of the return water pipe (244) is connected to the bottom end of the cooling wet membrane (241), the other end is connected to the water tank (243), one end of the water supply pipe (242) away from the cooling wet membrane (241) is connected to the water tank (243), the circulating pump (245) is arranged on the water supply pipe (242), and the second water supplement pipe (246) is connected to the water tank (243) and is configured to supplement water to the water tank (243).

11. The dual refrigerant system of claim 10, wherein, A second liquid level sensor (247) for detecting the liquid level is further arranged in the water tank (243), a second water supplement electric valve (248) is arranged on the second water supplement pipe (246), the second water supplement electric valve (248) is in communication connection with the second liquid level sensor (247) and is configured to turn on or cut off the second water supplement pipe (246) according to the liquid level of the water tank (243).

12. The dual refrigerant system of claim 1 wherein, The dual refrigeration system further comprises a first ring network pipe (300) and a second ring network pipe (400), the evaporative condensation phase change device (100) and the evaporative air conditioning box (200) are multiple, the input ends of multiple evaporative condensation phase change devices (100) are simultaneously connected to the first ring network pipe (300), the output ends of multiple evaporative condensation phase change devices (100) are simultaneously connected to the second ring network pipe (400), the input ends of multiple phase change heat transfer assemblies (220) are simultaneously connected to the second ring network pipe (400), and the output ends of multiple phase change heat transfer assemblies (220) are simultaneously connected to the first ring network pipe (300).

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