Mechanical refrigeration and natural cold source coupled composite radiation refrigeration system

Abstract

The utility model discloses a mechanical refrigeration and natural cold source coupled composite radiation refrigeration system. The composite refrigeration system is optimized. The indoor side circulation unit, the compression refrigeration circulation unit and the radiation refrigeration circulation unit are sequentially connected in series in a coupling mode. The radiation refrigeration cycle unit and the compression refrigeration cycle unit are coupled with the indoor side cycle unit in parallel; the indoor side circulation unit is used for collecting heat generated by the indoor side heat source; the compression refrigeration circulation unit is used for discharging heat collected by the indoor side circulation unit into the outdoor environment; the radiation refrigeration cycle unit is used for precooling the compression refrigeration cycle unit or the indoor side cycle, storing cold energy under the low-temperature condition and releasing the stored cold energy when needed to balance load fluctuation. Mechanical refrigeration and a natural cold source can be coupled to efficiently operate at the same time, the efficient, energy-saving and environment-friendly refrigeration effect is achieved, and wide adaptability and remarkable economic benefits are achieved.

Description

Technical Field

[0001] The utility model relates to the fields of refrigeration energy conservation, radiative cooling and system integration technology, in particular to a composite radiative cooling system coupling mechanical refrigeration and natural cold source. Background Art

[0002] Radiative cooling systems can be applied in many aspects, such as building cooling, electronic device heat dissipation, solar panel cooling, etc. Among them, the application in data centers is also very important. As high-energy-consuming facilities, data centers urgently need efficient and low-energy-consuming cooling solutions to reduce operating costs and carbon emissions. At present, most of the research on the application of radiative cooling focuses on the simulation level, and the engineering application is still in the preliminary research stage, without a mature and comprehensive radiative cooling system design. The application of radiative cooling can be divided into passive and active types. Passive applications use the radiative cooling of the night sky, usually without additional energy input, and are suitable for scenarios sensitive to energy consumption; active applications combine cold storage technology, which can make the application more flexible and provide stable cooling effects under a wider range of conditions.

[0003] However, the existing radiative cooling system designs face some challenges in practical applications. For example, how to maintain an efficient cooling effect under changing environmental conditions, and how to effectively integrate with existing refrigeration technologies to achieve a comprehensive optimized cooling solution. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a composite radiative cooling system coupling mechanical refrigeration and natural cold source, which can operate efficiently by coupling mechanical refrigeration and natural cold source at the same time, achieve efficient, energy-saving and environmentally friendly cooling effects, and has wide adaptability and remarkable economic benefits.

[0005] According to the composite radiative cooling system coupling mechanical refrigeration and natural cold source of the embodiment of the utility model, it includes an indoor-side circulation unit, a compression refrigeration cycle unit and a radiative cooling cycle unit; the indoor-side circulation unit, the compression refrigeration cycle unit and the radiative cooling cycle unit are coupled and connected in series in sequence; the radiative cooling cycle unit and the compression refrigeration cycle unit are coupled and connected to the indoor-side circulation unit in parallel;

[0006] Wherein, the indoor-side circulation unit is used for collecting the heat generated by the indoor-side heat source and transferring the heat to the compression refrigeration cycle unit; the compression refrigeration cycle unit is used for discharging the heat collected by the indoor-side circulation unit to the outdoor environment; the radiative cooling cycle unit is used for precooling the compression refrigeration cycle unit or the indoor side, and for storing cold energy under low-temperature conditions and releasing the stored cold energy when needed to balance load fluctuations.

[0007] According to the composite radiation refrigeration system coupling mechanical refrigeration and natural cold source of the embodiment of the present utility model, the indoor side circulation unit collects the heat of the indoor side heat source such as the high heat density data center environment, and transfers the heat to the compression refrigeration cycle unit or the radiation refrigeration cycle unit. Through the compression refrigeration cycle unit, the operation of both mechanical refrigeration and natural cooling can be realized. Through the radiation refrigeration cycle unit, the heat collected by the indoor side circulation unit can be directly taken away to pre-cool the indoor side circulation unit, and the heat of the compression refrigeration cycle unit can also be taken away to pre-cool the compression refrigeration cycle unit. By setting the radiation refrigeration cycle unit, on the one hand, the composite radiation refrigeration system coupling mechanical refrigeration and natural cold source of the embodiment of the present utility model can utilize the night sky radiation to cool down, realize zero-energy consumption cooling, and maximize the utilization of natural cold source. On the other hand, the flexibility and adaptability of the composite radiation refrigeration system coupling mechanical refrigeration and natural cold source of the embodiment of the present utility model are increased, and the cold energy can be stored when the environmental temperature is low and released during peak load, solving the problem of mismatch between supply and demand of cold energy in terms of time and intensity, and ensuring that the system can operate efficiently and stably under various environmental conditions. By combining multiple refrigeration methods such as radiation refrigeration, mechanical refrigeration and utilization of natural cold source, it can be dynamically adjusted according to the outdoor temperature and actual cooling capacity demand to ensure efficient operation, significantly improve the overall refrigeration efficiency, reduce the dependence on mechanical refrigeration, thereby reducing energy consumption and carbon emissions. By reducing the usage frequency of compressors and other mechanical refrigeration equipment in the compression refrigeration cycle unit, the equipment wear and failure rate are reduced, thereby prolonging the equipment life, reducing the maintenance and operation costs, and improving the economic benefits. The radiation refrigeration cycle unit operates continuously throughout the year, makes full use of natural cooling resources, reduces the compressor usage time, improves the reliability and stability of the cooling system, and ensures that the data center equipment operates in the best temperature environment.

[0008] The composite radiation refrigeration system coupling mechanical refrigeration and natural cold source of the embodiment of the present utility model realizes efficient, energy-saving and environmental protection refrigeration effects by optimizing the design of the composite refrigeration system, coupling mechanical refrigeration and natural cold source to operate efficiently at the same time, has wide adaptability and significant economic benefits, can meet the cooling requirements of high-energy-consuming facilities, and is particularly suitable for high heat density data center environments.

[0009] In some embodiments, the indoor side circulation unit includes an evaporator and a first heat exchanger. The evaporator and the first heat exchanger are connected in series to form an indoor side circulation loop. The evaporator is arranged at the indoor side heat source, and the first heat exchanger is arranged outdoors.

[0010] In some embodiments, the indoor side circulation unit further includes an evaporator fan, and the evaporator fan is arranged at the evaporator.

[0011] In some embodiments, the evaporator is a gravity heat pipe backplane.

[0012] In some embodiments, the compression refrigeration cycle unit is arranged outdoors and includes a compressor, an air-conditioning condenser, an air-conditioning condenser fan, a second heat exchanger, and an expansion valve; the first heat exchanger, the compressor, the air-conditioning condenser, the second heat exchanger, and the expansion valve are connected in series to form a compression refrigeration cycle loop, and the air-conditioning condenser fan is arranged at the air-conditioning condenser.

[0013] In some embodiments, the radiative refrigeration cycle unit is arranged outdoors and includes a second three-way valve, a radiative cooler, a third three-way valve, a first water pump, a first water tank, a fourth three-way valve, a second water pump, and a second water tank;

[0014] The second heat exchanger, the second three-way valve, the radiative cooler, the third three-way valve, the first water pump, the first water tank, the fourth three-way valve, and the second heat exchanger are connected in series to form a radiative refrigeration cycle loop;

[0015] The second water tank is connected to the second three-way valve through a third pipeline and to the third three-way valve through a fourth pipeline, so as to realize the cold storage function of the radiative refrigeration cycle unit;

[0016] The second water tank is connected to the fourth three-way valve through a fifth pipeline and to the pipeline between the second heat exchanger and the second three-way valve through a sixth pipeline, and the second water pump is arranged on the sixth pipeline, so as to realize the release function of the stored cooling capacity of the radiative refrigeration cycle unit.

[0017] In some embodiments, the radiative refrigeration cycle unit further includes a first filter and a second filter, the first filter is arranged between the first water pump and the first water tank; the second filter is arranged on the sixth pipeline and between the pipeline between the second heat exchanger and the second three-way valve and the second water pump.

[0018] In some embodiments, the radiative refrigeration cycle unit further includes a regulating valve, and the regulating valve is arranged between the fourth three-way valve and the second heat exchanger.

[0019] In some embodiments, the compression refrigeration cycle unit further includes a first three-way valve disposed between the second heat exchanger and the compressor; the radiative refrigeration cycle unit further includes a seventh pipeline and an eighth pipeline; one end of the seventh pipeline is connected to the first three-way valve, and the other end of the seventh pipeline is connected to the sixth pipeline and is located between the pipeline between the second heat exchanger and the second three-way valve and the second filter; one end of the eighth pipeline is connected to the pipeline between the expansion valve and the first heat exchanger, and the other end of the sixth pipeline is connected to the pipeline between the regulating valve and the second heat exchanger.

[0020] In some embodiments, it further includes a heat pipe condenser and a heat pipe condenser fan arranged outdoors; the heat pipe condenser fan is disposed at the heat pipe condenser, the heat pipe condenser is connected in parallel with the first heat exchanger, and the heat pipe condenser and the evaporator are connected in series to form an outer heat pipe natural cooling cycle loop.

[0021] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0023] Figure 1 is a schematic diagram of a composite radiative refrigeration system coupling mechanical refrigeration and natural cold sources according to an embodiment of the present utility model;

[0024] Figure 2 is a schematic diagram of a composite radiative refrigeration system coupling mechanical refrigeration and natural cold sources according to another embodiment of the present utility model;

[0025] Figure 3 is Figure 1 a schematic diagram of the operation mode of the composite radiative refrigeration system coupling mechanical refrigeration and natural cold sources.

[0026] Reference Numerals:

[0027] Indoor side circulation unit I; Compression refrigeration cycle unit II; Radiative refrigeration cycle unit III; Evaporator 100; First heat exchanger 101; First pipeline 102 (gas); Second pipeline 103; Evaporator fan 104; First three-way valve 205; Compressor 200; Air conditioner condenser 201; Air conditioner condenser fan 202; Second heat exchanger 203; Expansion valve 204; First three-way valve 205; Second three-way valve 300; Radiative cooler 301; Third three-way valve 302; First water pump 303; First water tank 304; Fourth three-way valve 305; Second water pump 306; Second water tank 307; Third pipeline 308; Fourth pipeline 309; Fifth pipeline 310; Sixth pipeline 311; First filter 312; Second filter 313; Control valve 314; Seventh pipeline 315; Eighth pipeline 316; Heat pipe condenser 400; Heat pipe condenser fan 401. Detailed implementation manners

[0028] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0029] The following will be combined with Figures 1 to 3 to describe the composite radiative refrigeration system with mechanical refrigeration and natural cold source coupling according to the embodiments of the present utility model.

[0030] As Figure 1 and Figure 2 shown, the composite radiative refrigeration system with mechanical refrigeration and natural cold source coupling according to the embodiments of the present utility model includes an indoor side circulation unit I, a compression refrigeration cycle unit II, and a radiative refrigeration cycle unit III.

[0031] Specifically, the indoor side circulation unit I, the compression refrigeration cycle unit II, and the radiative refrigeration cycle unit III are coupled and connected in series in sequence; the radiative refrigeration cycle unit III and the compression refrigeration cycle unit II are coupled and connected to the indoor side circulation unit I in parallel;

[0032] Among them, the indoor side circulation unit I is used to collect the heat generated by the indoor side heat source and transfer the heat to the compression refrigeration cycle unit II. The compression refrigeration cycle unit II is used to discharge the heat collected by the indoor side circulation unit I to the outdoor environment; the radiative refrigeration cycle unit III is used to pre-cool the compression refrigeration cycle unit II or the indoor side circulation unit I, and is used to store cold energy under low temperature conditions and release the stored cold energy when needed to balance the load fluctuation.

[0033] According to the composite radiation refrigeration system coupling mechanical refrigeration and natural cold source of the embodiment of the present utility model, the indoor side circulation unit I collects the heat of the indoor side heat source, such as the high heat density data center environment, and transfers the heat to the compression refrigeration cycle unit II or the radiation refrigeration cycle unit III. Through the compression refrigeration cycle unit II, the operation of simultaneous mechanical refrigeration and natural cooling can be realized. Through the radiation refrigeration cycle unit III, the heat collected by the indoor side circulation unit I can be directly taken away to pre-cool the indoor side circulation unit I, and the heat of the compression refrigeration cycle unit II can also be taken away to pre-cool the compression refrigeration cycle unit II. By setting the radiation refrigeration cycle unit III, on the one hand, the composite radiation refrigeration system coupling mechanical refrigeration and natural cold source of the embodiment of the present utility model can utilize the night sky radiation to cool down, achieve zero-energy consumption cooling, and maximize the utilization of natural cold source. On the other hand, it increases the flexibility and adaptability of the composite radiation refrigeration system coupling mechanical refrigeration and natural cold source of the embodiment of the present utility model, can store cold energy when the ambient temperature is low and release it at peak load, solve the problem of mismatch between supply and demand of cold energy in terms of time and intensity, and ensure the efficient and stable operation of the system under various environmental conditions. By combining multiple refrigeration methods such as radiation refrigeration, mechanical refrigeration and utilization of natural cold source, it can be dynamically adjusted according to the outdoor temperature and actual cooling capacity requirements to ensure efficient operation, significantly improve the overall refrigeration efficiency, reduce the dependence on mechanical refrigeration, thereby reducing energy consumption and carbon emissions. By reducing the usage frequency of the compressor 200 and other mechanical refrigeration equipment in the refrigeration cycle unit II, the equipment wear and failure rate are reduced, thereby prolonging the equipment life, reducing the maintenance and operation costs, and improving the economic benefits. The radiation refrigeration cycle unit III operates continuously throughout the year, makes full use of natural cooling resources, reduces the usage time of the compressor 200, improves the reliability and stability of the cooling system, and ensures the operation of the data center equipment in the best temperature environment.

[0034] The composite radiation refrigeration system coupling mechanical refrigeration and natural cold source of the embodiment of the present utility model realizes efficient, energy-saving and environmental protection refrigeration effects by optimizing the design of the composite refrigeration system, coupling mechanical refrigeration and natural cold source to operate efficiently at the same time. It has wide adaptability and remarkable economic benefits, can meet the cooling requirements of high-energy-consuming facilities, and is particularly suitable for high heat density data center environments.

[0035] In some embodiments, the indoor side circulation unit I includes an evaporator 100 and a first heat exchanger 101. The evaporator 100 and the first heat exchanger 101 are connected in series to form an indoor side circulation loop. Specifically, the first evaporator 100 and the first heat exchanger 101 are connected in series through a first pipeline 102 such as a gas pipe and a second pipeline 103 such as a liquid pipe to form the indoor side circulation loop. The evaporator 100 is arranged at the indoor heat source, and the first heat exchanger 101 is arranged outdoors. Thus, when the indoor side circulation unit I operates, the liquid refrigerant entering the evaporator 100 absorbs the heat generated by the indoor heat source and then turns into a gaseous refrigerant and enters the first heat exchanger 101. It releases heat in the first heat exchanger 101 and then turns back into a liquid refrigerant and flows back to the evaporator 100 to complete a working cycle. Among them, the first heat exchanger 101 can transfer the heat to the compression refrigeration cycle unit II. This cycle is one of the active refrigeration links in the composite radiation refrigeration system that couples mechanical refrigeration and natural cold source in this embodiment.

[0036] In some embodiments, the indoor side circulation unit I further includes an evaporator fan 104. The evaporator fan 104 is arranged at the evaporator 100 and can dissipate heat from the evaporator 100.

[0037] In some embodiments, as Figure 1 shown, the evaporator 100 is a gravity heat pipe backplane, which can realize pump-free self-driven circulation of the medium. The heat pipe backplane serves as the evaporator 100 to collect the heat generated by the indoor heat source and relies on the cooling medium in the pipe to transfer the heat to the outdoor side. Among them, the gravity heat pipe backplane supports various data center or energy storage power station battery pack cooling forms based on heat load and heat flux.

[0038] In some embodiments, the compression refrigeration cycle unit II is arranged outdoors and includes a compressor 200, an air conditioner condenser 201, an air conditioner condenser fan 202, a second heat exchanger 203, and an expansion valve 204. The first heat exchanger 101, the compressor 200, the air conditioner condenser 201, the second heat exchanger 203, and the expansion valve 204 are connected in series to form a compression refrigeration cycle loop. The air conditioner condenser fan 202 is arranged at the air conditioner condenser 201. When the compression refrigeration cycle unit II operates, the working medium completes the compression refrigeration cycle to transfer the heat from the first heat exchanger 101 to the air conditioner condenser 201, and finally discharges it to the outdoor environment through the air conditioner condenser fan 202. It is an important link in the active refrigeration of the composite radiation refrigeration system that couples mechanical refrigeration and natural cold source in this embodiment. The setting of the second heat exchanger 203 is mainly to pre-cool the air conditioner condenser 201 by using the cold energy of the radiation refrigeration cycle unit III, improve the cooling efficiency, and reduce the compression refrigeration energy consumption.

[0039] In some embodiments, the radiative cooling cycle unit III is arranged outdoors and includes a second three-way valve 300, a radiative cooler 301, a third three-way valve 302, a first water pump 303, a first water tank 304, a fourth three-way valve 305, a second water pump 306, and a second water tank 307.

[0040] The second heat exchanger 203, the second three-way valve 300, the radiative cooler 301, the third three-way valve 302, the first water pump 303, the first water tank 304, the fourth three-way valve 305, and the second heat exchanger 203 are connected in series to form a radiative cooling cycle loop; in this radiative cooling cycle loop, the first water pump 303 provides power for the water circulation, so that the low-temperature cooling water flowing out of the radiative cooler 301 enters the second heat exchanger 203 through the first water pump 303, the first water tank 304, and the fourth three-way valve 305 for heat exchange, to pre-cool the air-conditioning condenser 201 and improve the cooling efficiency. The high-temperature cooling water after heat exchange returns to the radiative cooler 301 through the second three-way valve 300 and is cooled using the natural cold source.

[0041] The second water tank 307 is connected to the second three-way valve 300 through a third pipeline 308 and is connected to the third three-way valve 302 through a fourth pipeline 309, thereby realizing the cold storage function of the radiative cooling cycle unit III. It can be understood that when the ambient temperature is low, the cooling water flowing into the radiative cooler 301 through the second three-way valve 300 is cooled using the natural cold source and then flows into the second water tank 307 along the fourth pipeline 309 through the third three-way valve 302, and the cold is stored through the second water tank 307.

[0042] The second water tank 307 is connected to the fourth three-way valve 305 through a fifth pipeline 310 and is connected to the pipeline between the second heat exchanger 203 and the second three-way valve 300 through a sixth pipeline 311. The second water pump 306 is arranged on the sixth pipeline 311, thereby realizing the release function of the cold stored in the radiative cooling cycle unit III. It can be understood that during peak loads, the second water pump 306 starts, so that the cold storage cooling water in the second water tank 307 enters the second heat exchanger 203 or the first heat exchanger 101 for heat exchange, thereby releasing the cold stored in the second water tank 307.

[0043] That is to say, by storing and releasing cold, the problem of the mismatch between the supply and demand of cold energy in terms of time and intensity can be solved, ensuring that the system can operate efficiently and stably under various environmental conditions.

[0044] In some embodiments, the radiative cooling cycle unit III further includes a first filter 312 and a second filter 313. The first filter 312 is disposed between the first water pump 303 and the first water tank 304, which helps to prevent impurities in the water from entering the first water pump 303, thereby increasing the service life of the first water pump 303. The second filter 313 is disposed on the sixth pipeline 311 between the pipeline between the second heat exchanger 203 and the second three-way valve 300 and the second water pump 306, which helps to prevent impurities in the water from entering the second water pump 306, thereby increasing the service life of the second water pump 306.

[0045] In some embodiments, the radiative cooling cycle unit III further includes a regulating valve 314, which is disposed between the fourth three-way valve 305 and the second heat exchanger 203. By providing the regulating valve 314, the water flow rate of the cooling water of the radiative cooling cycle unit III entering the second heat exchanger 203 can be adjusted.

[0046] In some embodiments, the compression refrigeration cycle unit II further includes a first three-way valve 205, which is disposed between the second heat exchanger 203 and the compressor 200. The radiative cooling cycle unit III further includes a seventh pipeline 315 and an eighth pipeline 316. One end of the seventh pipeline 315 is connected to the first three-way valve 205, and the other end of the seventh pipeline 315 is connected to the sixth pipeline 311 between the pipeline between the second heat exchanger 203 and the second three-way valve 300 and the second filter 313. One end of the eighth pipeline 316 is connected to the pipeline between the expansion valve 204 and the first heat exchanger 101, and the other end of the sixth pipeline 311 is connected to the pipeline between the regulating valve 314 and the second heat exchanger 203. In this way, the radiative cooling cycle unit III can be used to take away the heat collected by the indoor cycle unit I, pre-cool the indoor cycle unit I, and the compression refrigeration cycle unit II can be turned off, reducing the operation of the compression refrigeration cycle unit II and the dependence on mechanical refrigeration, thereby reducing energy consumption and carbon emissions. By reducing the usage frequency of the compressor 200 and other mechanical refrigeration devices, the equipment wear and failure rate can be reduced, thereby extending the equipment life, reducing the maintenance and operation costs, and improving the economic benefits.

[0047] In some embodiments, such as Figure 1As shown, it also includes a heat pipe condenser 400 and a heat pipe condenser fan 401 arranged outdoors; the heat pipe condenser fan 401 is arranged at the heat pipe condenser 400, the heat pipe condenser 400 is connected in parallel with the first heat exchanger 101, and the heat pipe condenser 400 is connected in series with the evaporator 100 to form an outer heat pipe natural cooling circulation loop. The refrigerant absorbs the heat in the room and vaporizes in the evaporator 100, enters the heat pipe condenser 400 to liquefy and discharges the heat to the outdoor environment through the heat pipe condenser fan 401, and the liquefied refrigerant flows back to the evaporator 100 under the action of gravity, completing a cycle. This cycle is the main cycle of the natural cold source utilization in the composite radiation refrigeration system of the embodiment of the mechanical refrigeration and natural cold source coupling composite refrigeration system. When the outdoor environment temperature is lower than the start temperature of the heat pipe condenser 400, the outer heat pipe natural cooling cycle starts to run.

[0048] The following example describes Figure 1 The operation mode of the composite radiation cooling system coupled with mechanical cooling and natural cooling source shown;

[0049] like Figure 3 As shown in Table 1, the outdoor environment conditions (seasons) Figure 1 The switching states and water flow directions of the four three-way valves (i.e., the first three-way valve 205, the second three-way valve 300, the third three-way valve 302 and the fourth three-way valve 305) and the two water pumps (i.e., the first water pump 303 and the second water pump 306) of the composite radiation refrigeration system coupled with mechanical refrigeration and natural cooling source shown in the figure form four different operating modes. Figure 1 The four directions of A, B, C, and D are marked in Table 1 to clarify the specific switching directions of the four three-way valves and the water flow directions of the two water pumps. It is worth noting that the natural cooling cycle of the outer heat pipe will automatically start and stop according to the outdoor environmental conditions without the need for valve and pump control.

[0050] Outdoors, the composite radiant refrigeration system of the embodiment, which is a combination of mechanical refrigeration and natural cooling source, can dissipate heat in various modes according to the required cooling capacity and outdoor temperature. The composite radiant refrigeration system of the embodiment, which is a combination of mechanical refrigeration and natural cooling source, can operate in four different modes according to the outdoor temperature (e.g. Figure 1 and Figure 3 As shown), as follows:

[0051] In summer, a compression refrigeration cycle (VCRS) coupled with a radiation refrigeration cycle (RC) mode is used.

[0052] In the transitional season with higher temperature, the natural cooling cycle (NC) with external heat pipe and the compression refrigeration cycle (VCRS) are coupled with the radiation refrigeration cycle (RC) mode.

[0053] In the transitional season with relatively low temperatures, the natural cooling cycle of the outer heat pipe (NC) is used to couple with the radiation cooling cycle (RC).

[0054] In winter, the natural cooling cycle of the outer heat pipe (NC) and the radiation cooling cycle (RC) are used to couple with the cold storage function for data centers and industrial applications that require cooling throughout the year.

[0055] As the outdoor temperature drops, Figure 1 The composite radiation cooling system that couples mechanical refrigeration with natural cold sources, as shown, operates in the mode of coupling the natural cooling cycle of the outer heat pipe (NC) with the radiation cooling cycle (RC), maximizing the use of the natural cold source of the natural cooling cycle of the outer heat pipe (NC) to save energy. Utilizing the natural cooling cycle of the outer heat pipe (NC) and the radiation cooling cycle (RC) is also beneficial for precooling the building before summer, thereby reducing the energy load of the cooling system when the temperature rises. This method conforms to sustainable building practices, reduces greenhouse gas emissions, and lowers operating energy costs.

[0056] Among them, the natural cooling cycle of the outer heat pipe and the mechanical compression refrigeration cycle coupled with radiation cooling are relatively independent, and can achieve stepless and smooth switching according to the change of outdoor temperature. The radiation cooling cycle can operate continuously throughout the year. The composite radiation cooling system that couples mechanical refrigeration with natural cold sources in this embodiment can be applied to the cooling throughout the year in data centers, maximizing the utilization of natural cooling resources, while reducing the usage time of the compressor 200 in the distributed air-cooled data center, and combining with the second water tank 307 (cold storage) to store cold energy under lower ambient temperatures, achieving high efficiency and energy conservation.

[0057] Figure 1 The composite radiation cooling system that couples mechanical refrigeration with natural cold sources, as shown, is more suitable for some newly built refrigeration systems; and currently at the key node of energy conservation and consumption reduction transformation, it is necessary to transform and upgrade the refrigeration systems of many traditional small-scale old buildings, which is the top priority to meet the growing computing power requirements of the era. For example, the Figure 2 composite radiation cooling system that couples mechanical refrigeration with natural cold sources, as shown, can be adopted.

[0058] It should be noted that in the above description, the evaporator 100, the first heat exchanger 101, the second heat exchanger 203, the heat pipe condenser 400, the air conditioner condenser 201, the radiation cooler 301, and the second water tank 307 are all heat exchange components, and the evaporator fan 104, the heat pipe condenser fan 401, the air conditioner condenser fan 202, the compressor 200, the first water pump 303, and the second water pump 306 are all power components.

[0059] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0060] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A composite radiation refrigeration system that couples mechanical refrigeration with a natural cooling source, characterized in that: It includes an indoor circulation unit, a compression refrigeration circulation unit and a radiation refrigeration circulation unit; the indoor circulation unit, the compression refrigeration circulation unit and the radiation refrigeration circulation unit are coupled and connected in series in sequence; the radiation refrigeration circulation unit and the compression refrigeration circulation unit are coupled and connected in parallel with the indoor circulation unit; Among them, the indoor circulation unit is used to collect the heat generated by the indoor heat source and transfer the heat to the compression refrigeration circulation unit; the compression refrigeration circulation unit is used to discharge the heat collected by the indoor circulation unit to the outdoor environment; the radiation refrigeration circulation unit is used to pre-cool the compression refrigeration circulation unit or the indoor circulation, and to store cold energy under low temperature conditions and release the stored cold energy when needed to balance load fluctuations.

2. The composite radiation refrigeration system of mechanical refrigeration coupled with natural cooling source according to claim 1 is characterized in that: The indoor circulation unit includes an evaporator and a first heat exchanger. The evaporator and the first heat exchanger are connected in series to form an indoor circulation loop. The evaporator is arranged at the indoor heat source, and the first heat exchanger is arranged outdoors.

3. The composite radiation refrigeration system of mechanical refrigeration coupled with natural cooling source according to claim 2 is characterized in that: The indoor side circulation unit further includes an evaporator fan, and the evaporator fan is disposed at the evaporator.

4. The composite radiation refrigeration system of mechanical refrigeration coupled with natural cooling source according to claim 2, characterized in that: The evaporator is a gravity heat pipe back plate.

5. The composite radiation refrigeration system of mechanical refrigeration coupled with natural cooling source according to claim 2, characterized in that: The compression refrigeration cycle unit is arranged outdoors, and includes a compressor, an air-conditioning condenser, an air-conditioning condenser fan, a second heat exchanger and an expansion valve; the first heat exchanger, the compressor, the air-conditioning condenser, the second heat exchanger and the expansion valve are connected in series to form a compression refrigeration cycle loop, and the air-conditioning condenser fan is arranged at the air-conditioning condenser.

6. The composite radiation refrigeration system of mechanical refrigeration coupled with natural cooling source according to claim 5, characterized in that: The radiation refrigeration cycle unit is arranged outdoors and includes a second three-way valve, a radiation refrigerator, a third three-way valve, a first water pump, a first water tank, a fourth three-way valve, a second water pump and a second water tank; The second heat exchanger, the second three-way valve, the radiation refrigerator, the third three-way valve, the first water pump, the first water tank, the fourth three-way valve and the second heat exchanger are connected in series to form a radiation refrigeration cycle loop; The second water tank is connected to the second three-way valve through a third pipeline and is connected to the third three-way valve through a fourth pipeline, thereby realizing the cold storage function of the radiation refrigeration cycle unit; The second water tank is connected to the fourth three-way valve through the fifth pipeline and is connected to the pipeline between the second heat exchanger and the second three-way valve through the sixth pipeline. The second water pump is arranged on the sixth pipeline, thereby realizing the function of releasing the cold storage capacity of the radiation refrigeration cycle unit.

7. The composite radiation refrigeration system of mechanical refrigeration coupled with natural cooling source according to claim 6, characterized in that: The radiation refrigeration cycle unit also includes a first filter and a second filter, wherein the first filter is arranged between the first water pump and the first water tank; the second filter is arranged on the sixth pipeline and between the pipeline between the second heat exchanger and the second three-way valve and the second water pump.

8. The composite radiation refrigeration system of mechanical refrigeration coupled with natural cooling source according to claim 7, characterized in that: The radiation refrigeration cycle unit further includes a regulating valve disposed between the fourth three-way valve and the second heat exchanger.

9. The composite radiation refrigeration system of mechanical refrigeration coupled with natural cooling source according to claim 8, characterized in that: The compression refrigeration cycle unit further includes a first three-way valve, which is arranged between the second heat exchanger and the compressor; The radiation refrigeration cycle unit also includes a seventh pipeline and an eighth pipeline; one end of the seventh pipeline is connected to the first three-way valve, and the other end of the seventh pipeline is connected to the sixth pipeline and is located between the pipeline between the second heat exchanger and the second three-way valve and the second filter; one end of the eighth pipeline is connected to the pipeline between the expansion valve and the first heat exchanger, and the other end of the sixth pipeline is connected to the pipeline between the regulating valve and the second heat exchanger.

10. The composite radiation refrigeration system of mechanical refrigeration coupled with natural cooling source according to claim 2, characterized in that: It also includes a heat pipe condenser and a heat pipe condenser fan arranged outdoors; the heat pipe condenser fan is arranged at the heat pipe condenser, the heat pipe condenser is connected in parallel with the first heat exchanger, and the heat pipe condenser is connected in series with the evaporator to form an outer heat pipe natural cooling circulation loop.

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