A hybrid refrigeration system and method of use

Abstract

The application provides a composite refrigeration system and an application method, the system comprising an evaporator, a compressor, a micro-channel radiator, a water distributor, a water curtain evaporator, a supercooler, a throttling device and a water pump, a refrigerant heat dissipation main loop, a water medium heat exchange loop and a refrigerant supercooling heat exchange loop are constructed, three loops are coupled with each other to realize heat stepwise absorption and heat exchange; meanwhile, a copper-free structure design is adopted, three cooling modes of water curtain evaporative cooling, micro-channel air cooling and steam-water reverse heat exchange are combined, and the working environment temperature of a refrigeration core component and the refrigerant supercooling degree are effectively reduced. The application also provides an application method of the system, high-temperature environment efficient refrigeration is realized through the collaborative operation of the three loops, and the technical problems of the insufficient heat dissipation, high energy consumption and short service life of core components of the traditional air-cooled and water-cooled refrigeration system in a high-temperature environment are solved.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, specifically to a composite refrigeration system and its application method, applicable to various refrigeration equipment such as household and commercial air conditioners, data center computer rooms, outdoor communication base stations, special industrial cooling systems, refrigeration units, and ice makers in high-temperature environments. Background Technology

[0002] Refrigeration equipment is widely used in data centers, outdoor communication base stations, special industrial cooling, and air conditioning systems in high-temperature environments. In these application scenarios, the ambient temperature is often high, and the high temperature air can have a serious impact on traditional air-cooled refrigeration systems: on the one hand, it causes a sharp drop in the system's condensation and heat dissipation efficiency, resulting in increased condensation pressure, a significant increase in compressor load, and a significant increase in system energy consumption; on the other hand, the high-temperature working environment accelerates the aging of core components such as compressors, severely shortening the service life of the equipment.

[0003] To address the heat dissipation deficiencies of air-cooled systems, water-cooled refrigeration systems have been gradually adopted, offering stronger heat dissipation capabilities. However, they also have several technical drawbacks: water-cooled systems typically require external cooling towers or fixed water sources, resulting in complex overall system structures and high installation and maintenance costs; they also carry the risk of pipe leaks, demanding stringent requirements for installation techniques and sealing performance, and are unsuitable for applications in water-scarce areas or with limited space.

[0004] In addition, traditional refrigeration systems often use copper components for heat dissipation, which significantly increases the manufacturing cost of the system in a market environment where copper prices continue to soar. Furthermore, the refrigerant heat dissipation of traditional refrigeration systems is mostly single-stage heat exchange, with low heat absorption and transfer efficiency, which makes it impossible to achieve cascade utilization of heat and further limits the improvement of refrigeration efficiency. Summary of the Invention

[0005] In view of the above, it is necessary for the present invention to provide a composite refrigeration system and its application method, which can improve the refrigeration efficiency and service life of the refrigeration system while reducing system costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A composite refrigeration system includes an evaporator, a compressor, a microchannel radiator, a water distributor, a water curtain evaporator, a subcooler, a throttling device, and a water pump.

[0007] The evaporator, compressor, microchannel radiator, subcooler, and throttling device are sequentially connected through pipelines to form a closed refrigerant heat dissipation main circuit, which is used to complete the basic compression, condensation, throttling, and evaporation cycle of the refrigerant.

[0008] The water distributor, water curtain evaporator, water tank, water pump, and subcooler are sequentially connected via water pipes, forming a closed water-medium heat exchange loop. The water medium in this loop circulates under the drive of the water pump, absorbing heat from the refrigerant and pre-cooling itself as it flows through the subcooler. It is then evenly sprayed onto the water curtain evaporator by the water distributor, utilizing the heat absorption effect of water evaporation to directly cool the high-temperature air surrounding the compressor and microchannel radiator, thereby actively and effectively reducing the operating environment temperature of the core heat-generating components.

[0009] The subcooler is connected in series in the main refrigerant heat dissipation circuit, and its interior contains isolated refrigerant channels and water medium channels. The medium-temperature refrigerant from the microchannel radiator and the low-temperature water from the water medium heat exchange circuit undergo indirect, reverse heat exchange within the subcooler, thus forming a refrigerant subcooling heat exchange circuit. This circuit is specifically designed for deep subcooling of the refrigerant after its initial air-cooling cooling, increasing the cooling capacity per unit refrigerant cycle.

[0010] Preferably, the heat exchange cores of both the evaporator and the microchannel radiator adopt an aluminum alloy microchannel structure, and all refrigerant connection pipes adopt high-pressure resistant alloy pipes, realizing the copper-free heat dissipation structure of the entire system. While ensuring excellent heat exchange performance, it significantly reduces material costs and dependence on rare metals.

[0011] Preferably, the subcooler adopts a shell and built-in coil structure. The coil is preferably made of stainless steel and designed in a spiral or wavy shape. The refrigerant flows on the shell side and the water flows on the tube side in opposite directions to maximize heat exchange efficiency.

[0012] Preferably, the water curtain chamber of the water curtain evaporator is filled with polymer wet curtain packing material to greatly increase the contact area between water and air and improve the evaporation cooling efficiency.

[0013] Furthermore, the present invention also provides an application method for the above-mentioned composite refrigeration system, specifically including the following steps: S1: Charge the refrigerant to the rated pressure in the main refrigerant heat dissipation circuit and inject clean water to the rated level in the water medium heat exchange circuit to complete the pre-operation preparations.

[0014] S2: First, start the water pump to drive the water medium circulation. After the low-temperature water is pre-cooled in the subcooler, it forms a water curtain through the water distributor to evaporate and cool the hot air around the compressor and microchannel radiator, thereby reducing the operating environment temperature of the core components before starting the main refrigeration cycle.

[0015] S3: The compressor and its associated fan are then started. The refrigerant undergoes a series of processes: first, air cooling in the microchannel radiator; second, water cooling in the subcooler through counter-current heat exchange with low-temperature water; third, pressure and temperature reduction via a throttling device; and finally, heat absorption and cooling in the evaporator, completing one cycle. During this process, the water circuit operates continuously, serving a dual purpose: firstly, to continuously cool the components; and secondly, to continuously provide a cooling source for the subcooler.

[0016] S4: Maintain synchronous operation of the water circuit and the refrigerant main circuit. The water curtain evaporative cooling continuously stabilizes the ambient temperature of the components, the microchannel radiator undertakes the main heat dissipation load, and the subcooler uses water that has been cooled by the environment to deeply subcool the refrigerant. The three work together to achieve efficient and stable cooling of the system under high-temperature conditions.

[0017] S5: When shutdown is required, first turn off the compressor, wait for the refrigerant to complete its current cycle, then turn off all fans, and finally turn off the water pump. This sequence ensures a smooth system shutdown and avoids shock.

[0018] The beneficial effects of this invention are as follows: 1. By designing a three-loop coupled composite heat exchange structure, a triple-stage heat exchange is achieved, which includes "water curtain evaporative cooling to cool the core components + microchannel air cooling + steam-water reverse heat exchange". The refrigerant is cooled a second time through air cooling and steam-water heat exchange, which solves the problem of low single-stage heat exchange efficiency in traditional air-cooling systems and greatly improves the cooling efficiency in high-temperature environments.

[0019] 2. Adopting a copper-free structural design, the heat exchange core of the evaporator and microchannel radiator is made of aluminum alloy microchannel structure, and the refrigerant piping is made of high-pressure resistant alloy pipe. While ensuring heat exchange performance and structural strength, it significantly reduces the manufacturing cost caused by the use of copper materials, making it suitable for the market environment of soaring copper prices.

[0020] 3. The water medium heat exchange circuit of the present invention is a closed loop, which does not require an external cooling tower or a fixed water source. It has a compact structure and is easy to install. It can be adapted to application scenarios with limited space and high waterproof requirements, such as water-scarce areas, outdoor communication base stations, and data center computer rooms, thus solving the problem of poor adaptability of traditional water cooling systems.

[0021] 4. By using water curtain evaporative cooling, the operating ambient temperature of the compressor and microchannel radiator is directly reduced, effectively reducing the compressor load, lowering system energy consumption, delaying the aging of core components, and significantly extending the service life of the equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the structural principle of the composite refrigeration system of the present invention; Figure 2 This is a flowchart of the method of the present invention.

[0023] Explanation of reference numerals in the attached figures: 1. Evaporator; 2. Compressor; 3. Microchannel radiator; 4. Water distributor; 5. Water curtain evaporator; 51. Water curtain chamber; 52. Water tank; 6. Subcooler; 61. Shell; 62. Coil; 7. Throttling device; 8. Water pump. Detailed Implementation

[0024] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0025] Example 1 like Figure 1 As shown, this embodiment of the invention provides a composite refrigeration system, including an evaporator 1, a compressor 2, a microchannel radiator 3, a water distributor 4, a water curtain evaporator 5, a subcooler 6, a throttling device 7, and a water pump 8. The evaporator 1, compressor 2, microchannel radiator 3, subcooler 6, and throttling device 7 are sequentially and sealed together, with the throttling device 7 connected back to the evaporator 1, forming a refrigerant heat dissipation main circuit. The water distributor 4, water curtain evaporator 5, water pump 8, and subcooler 6 are sequentially connected, with the subcooler 6 also connected to the water distributor 4, forming a water medium heat exchange circuit. The subcooler 6 is connected in series in the refrigerant heat dissipation main circuit, sharing both the refrigerant heat dissipation main circuit and the water medium heat exchange circuit. The subcooler 6 also forms a refrigerant subcooling heat exchange circuit with the refrigerant, and the three circuits are coupled to achieve cascaded heat absorption and exchange.

[0026] The refrigerant output end of evaporator 1 is sealed to the suction end of compressor 2, the refrigerant output end of compressor 2 is sealed to the refrigerant inlet of microchannel radiator 3, the refrigerant outlet of microchannel radiator 3 is sealed to the inlet of shell 61 of subcooler 6, the outlet of shell 61 of subcooler 6 is sealed to the inlet of throttling device 7, and the outlet of throttling device 7 is sealed to the refrigerant inlet of evaporator 1, forming a closed refrigerant heat dissipation main circuit. The throttling device 7 is an electronic expansion valve with a suddenly narrowing throttling channel inside, achieving refrigerant throttling, pressure reduction, and flow control. A blower fan is installed at the heat exchange end of evaporator 1, with the fan's outlet direction facing the heat exchange surface of evaporator 1, pushing air to flow rapidly through evaporator 1 and improving the heat exchange efficiency between the refrigerant and the outside air. A cooling fan is installed at the heat dissipation end of microchannel radiator 3, with the fan's outlet direction facing the microchannel array of microchannel radiator 3, accelerating airflow to enhance the refrigerant heat dissipation effect.

[0027] The water distributor 4 is fixedly positioned at the midpoint between the top of the compressor 2 and the microchannel radiator 3. The water curtain evaporator 5 is positioned directly below the water distributor 4, in the gap between the compressor 2 and the microchannel radiator 3. The water curtain evaporator 5 is integrally formed with a water curtain chamber 51 and a bottom water tank 52. The outlet of the water distributor 4 faces the top of the water curtain chamber 51, achieving uniform spraying of the water medium. The outlet of the water tank 52 is connected to the inlet of the water pump 8 via a water supply pipe. The outlet of the water pump 8 is connected to the inlet of the coil 62 of the subcooler 6. The outlet of the coil 62 of the subcooler 6 is sealed to the inlet of the water distributor 4 via a return water pipe, forming a closed water medium heat exchange circuit. A water replenishment port is provided on the side wall of the water tank 52 for replenishing or replacing the water medium in the water medium heat exchange circuit, ensuring the quantity and cleanliness of the heat exchange medium. The water curtain chamber 51 is lined with polymer wet curtain packing to increase the contact area between the water medium and the hot air, thereby improving the heat exchange efficiency.

[0028] The subcooler 6 includes a hollow shell 61 and a coil 62 installed inside the shell 61. Both ends of the shell 61 have refrigerant connection ports, which are connected to the microchannel radiator 3 and the throttling device 7, respectively, forming refrigerant flow channels. The coil 62 adopts a spiral or wavy structure, with both ends penetrating the shell 61 and connected to the water pump 8 and the water distributor 4, forming a water medium flow channel. The refrigerant and water medium exchange heat indirectly within the subcooler 6 through the walls of the shell 61 and the coil 62, without contacting each other. Preferably, the flow direction of the refrigerant in the shell 61 is counter-current to the flow direction of the water medium in the coil 62, i.e., they flow in opposite directions, achieving counter-current heat exchange between the hot and cold fluids, maximizing heat exchange efficiency, and improving the subcooling effect of the refrigerant. The coil 62 is made of 316 stainless steel threaded tubing, possessing good thermal conductivity, corrosion resistance, and structural strength, suitable for long-term circulating use of the water medium.

[0029] Furthermore, the heat exchange cores of evaporator 1 and microchannel radiator 3 both adopt aluminum alloy microchannel structures, compressor 2 is a fully enclosed scroll compressor, and the refrigerant piping is adapted to high-pressure resistant and corrosion-resistant alloy pipes. The entire heat dissipation structure achieves a copper-free design, significantly reducing manufacturing costs. All sealing connections of the refrigerant piping use high-temperature resistant gaskets and clamps for secure sealing, structurally ensuring the sealing performance of the refrigerant circuit and preventing refrigerant leakage. Water distributor 4 and water tank 52 are made of engineering plastics or stainless steel, effectively preventing water contamination and component corrosion and aging. Water pump 8 is a corrosion-resistant centrifugal pump, suitable for long-term water circulation working environments, significantly extending the service life of the equipment.

[0030] To illustrate the cooling and subcooling effects of this invention, the evaporation cooling efficiency of the water curtain evaporator 5 is calculated using an industry-standard formula: Where η is the evaporative cooling efficiency (%) of the wet curtain. The dry-bulb temperature of the inlet air (°C) The dry-bulb temperature of the outlet air (°C) The wet-bulb temperature of the inlet air (°C). Under the current national standards GB7725 and 2022 for room air conditioners, and the standard outdoor operating conditions (dry and wet bulb temperatures 35°C / 24°C), when the unit's water flow rate is 6 m³ / h (100 L / s), the evaporative cooling efficiency η of the water curtain evaporator 5 is ≥83%. The calculated dry-bulb temperature of the outlet air... =26℃, the water curtain achieves a single temperature drop of 9℃, which can effectively reduce the ambient temperature around the compressor 2 and the microchannel radiator 3. Under the most unfavorable operating conditions (inlet water temperature 35℃, water flow rate 6m³ / h), the refrigerant enters the shell 61 of the subcooler 6 at a condensation temperature of 41℃. After reverse heat exchange with the water medium, the subcooling degree of the refrigerant can be reduced by 3℃. Under the premise of controllable cost, by optimizing the structural parameters of the coil 62 and the water medium flow rate, the limit of the reduction in refrigerant subcooling degree can be close to 6℃, which significantly improves the subcooling effect of the refrigerant.

[0031] Example 2 Based on the aforementioned composite refrigeration system, this embodiment provides its application method. For example... Figure 2 As shown, this method achieves efficient cooling in high-temperature environments through the coordinated operation of the refrigerant heat dissipation main circuit, the water medium heat exchange circuit, and the refrigerant subcooling heat exchange circuit. The specific steps are as follows: Step S1: Charge the refrigerant (coolant) into the main refrigerant heat dissipation circuit to ensure that the pressure value of the refrigerant circuit is within the rated operating range; inject clean water into the water medium heat exchange circuit through the water inlet of the water tank 52 until the water level in the water tank 52 reaches the rated liquid level, and complete the system medium replenishment.

[0032] Step S2: Start the water pump 8. The water pump 8 draws water medium from the water tank 52 and delivers it to the coil 62 of the subcooler 6. The water medium flows in the coil 62 and exchanges heat with the refrigerant in the shell 61, resulting in a temperature drop. The low-temperature water medium enters the water distributor 4 through the return water pipe. The water distributor 4 sprays the low-temperature water medium evenly into the water curtain chamber 51 of the water curtain evaporator 5, forming a water curtain structure. The flowing water curtain comes into full contact with the hot air emitted by the compressor 2 and the microchannel radiator 3 during operation, absorbs heat, and falls into the water tank 52 at the bottom, completing one cycle of the water medium. Continuing to run this loop achieves direct cooling of the compressor 2 and the microchannel radiator 3, reducing the operating ambient temperature of the core refrigeration components.

[0033] Step S3: Start the compressor 2, the blower fan of the evaporator 1 and the cooling fan of the microchannel radiator 3. The suction end of the compressor 2 draws the low-temperature, low-pressure refrigerant from the evaporator 1, compresses it into a high-temperature, high-pressure refrigerant fluid, and delivers it to the microchannel radiator 3. After the high-temperature, high-pressure refrigerant enters the microchannel radiator 3, it is evenly distributed in the microchannel array. Under the action of the cooling fan, it exchanges heat with the outside cold air to complete the first heat dissipation and cooling. The cooled refrigerant enters the shell 61 of the subcooler 6.

[0034] Step S4: The refrigerant entering the shell 61 of the subcooler 6 undergoes a reverse heat exchange with the low-temperature water medium in the coil 62, achieving secondary subcooling of the refrigerant. The subcooled refrigerant flows out from the outlet of the shell 61 of the subcooler 6 and enters the throttling device 7. When the refrigerant passes through the throttling channel of the throttling device 7, the pressure and temperature drop sharply, and some liquid flashes into gas, forming a low-temperature and low-pressure gas-liquid two-phase mixture, which then enters the evaporator 1.

[0035] Step S5: After the low-temperature and low-pressure gas-liquid two-phase refrigerant enters the evaporator 1, it comes into full contact with the high-temperature outside air under the action of the fan, absorbs the heat from the outside to achieve cooling. After the refrigerant absorbs heat and heats up, it is drawn back into the suction end of the compressor 2 to complete one refrigeration cycle of the refrigerant. By continuously running this circuit, continuous cooling of the external environment can be achieved.

[0036] Step S6: When it is necessary to stop the cooling, first turn off the compressor 2. After the refrigerant in the refrigerant heat dissipation main circuit completes the last cycle, turn off the evaporator 1's supply fan and the microchannel radiator 3's cooling fan; then turn off the water pump 8, stop the operation of the water medium heat exchange circuit, and complete the shutdown operation of the entire system.

[0037] In summary, this invention constructs a composite refrigeration system that coordinates the operation of a refrigerant heat dissipation main circuit, a water medium heat exchange circuit, and a refrigerant subcooling heat exchange circuit. This achieves a triple-stage heat exchange process: "evaporative cooling via water curtain + primary heat dissipation via microchannel air cooling + secondary subcooling via gas-water reverse heat exchange." This effectively solves the problems of insufficient heat dissipation and high energy consumption in traditional air-cooled systems under high-temperature environments. Furthermore, the system employs a copper-free design with aluminum alloy microchannels and alloy pipelines, significantly improving system energy efficiency while effectively reducing system costs.

[0038] It should be noted that the embodiments of the present invention are not limited to the above embodiments. For example, evaporative cooling can be in the form of water curtain, and air-cooled condensers and subcoolers can also adopt other equivalent structures. Its principle can be widely applied to various refrigeration scenarios such as household and commercial air conditioners, data center computer rooms, industrial refrigeration units and ice-making equipment.

[0039] The embodiments described above merely illustrate implementation methods of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A composite refrigeration system, characterized in that, It includes an evaporator (1), a compressor (2), a microchannel radiator (3), a water distributor (4), a water curtain evaporator (5), a subcooler (6), a throttling device (7), and a water pump (8). The evaporator (1), compressor (2), microchannel radiator (3), subcooler (6), and throttling device (7) are sequentially sealed and connected to form a closed refrigerant heat dissipation main circuit; The water distributor (4), water curtain evaporator (5), water pump (8), and subcooler (6) are connected in sequence to form a closed water medium heat exchange circuit that can be replenished with water periodically. The subcooler (6) is shared in the main heat dissipation circuit of the refrigerant and the heat exchange circuit of the water medium. The subcooler (6) also forms a refrigerant subcooling heat exchange circuit with the refrigerant. The three circuits are coupled to achieve the stepwise absorption and heat exchange of heat.

2. The composite refrigeration system according to claim 1, characterized in that, The heat exchange end of the evaporator (1) is equipped with a fan, and the air outlet direction of the fan is directly facing the heat exchange surface of the evaporator (1); the heat dissipation end of the microchannel radiator (3) is equipped with a cooling fan, and the air outlet direction of the cooling fan is directly facing the microchannel array of the microchannel radiator (3).

3. The composite refrigeration system according to claim 1, characterized in that, The water distributor (4) is fixed at the middle position between the top of the compressor (2) and the microchannel radiator (3). The water curtain evaporator (5) is located directly below the water distributor (4) and in the gap area between the compressor (2) and the microchannel radiator (3). The water curtain evaporator (5) is integrally formed with a water curtain chamber (51) and a water tank (52) at the bottom. The water outlet of the water distributor (4) is directly opposite the top of the water curtain chamber (51). A water inlet is opened on the side wall of the water tank (52). The water outlet of the water tank (52) is connected to the water inlet of the water pump (8) through a water supply pipe. The water outlet of the water pump (8) is connected to the inlet of the coil (62) of the subcooler (6). The outlet of the coil (62) of the subcooler (6) is sealed to the water inlet of the water distributor (4) through a return water pipe.

4. The composite refrigeration system according to claim 3, characterized in that, The water curtain chamber (51) is lined with polymer wet curtain filler.

5. The composite refrigeration system according to claim 1, characterized in that, The subcooler (6) includes a hollow shell (61) and a coil (62) installed inside the shell (61). The shell (61) has refrigerant connection ports at both ends, and the coil (62) passes through the shell (61) at both ends. The flow direction of the refrigerant in the shell (61) is countercurrent to the flow direction of the water medium in the coil (62). The coil (62) is a 316 stainless steel threaded pipe, and the coil (62) adopts a spiral or wavy structure.

6. The composite refrigeration system according to claim 1, characterized in that, The heat exchange cores of the evaporator (1) and the microchannel radiator (3) are both made of aluminum alloy microchannel structure. The compressor (2) is a fully enclosed scroll compressor. The refrigerant pipeline is made of high pressure resistant and corrosion resistant alloy pipe, realizing a copper-free heat dissipation structure.

7. The composite refrigeration system according to claim 1, characterized in that, The throttling device (7) is an electronic expansion valve.

8. An application method based on the composite refrigeration system according to any one of claims 1-7, characterized in that, Includes the following steps: S1: Charge the refrigerant into the main refrigerant heat dissipation circuit with a suitable refrigerant to ensure that the pressure value of the refrigerant circuit is within the rated working range; inject clean water into the water medium heat exchange circuit through the water inlet of the water tank (52) until the water level in the water tank (52) reaches the rated liquid level, and complete the system medium replenishment; S2: Start the water pump (8), the water pump (8) draws water medium from the water tank (52) and delivers it to the coil (62) of the subcooler (6). The water medium exchanges heat with the refrigerant in the shell (61). After the water medium releases heat, it enters the water distributor (4) through the return water pipe. The water distributor (4) sprays the low temperature water medium evenly into the water curtain chamber (51) of the water curtain evaporator (5) to form a water curtain. After fully contacting the hot air emitted by the compressor (2) and the microchannel radiator (3) and absorbing heat, it falls into the water tank (52) to complete the water medium circulation and continuously reduce the working environment temperature of the core refrigeration components. S3: Start the compressor (2), the blower fan of the evaporator (1) and the cooling fan of the microchannel radiator (3). The compressor (2) draws low-temperature and low-pressure refrigerant from the evaporator (1) and compresses it into high-temperature and high-pressure refrigerant fluid, which is then transported to the microchannel radiator (3). The high-temperature and high-pressure refrigerant exchanges heat with the outside cold air in the microchannel array, completing the refrigerant heat release and cooling. After the refrigerant completes the first heat dissipation and cooling, it enters the shell (61) of the subcooler (6). S4: The refrigerant in the shell (61) of the subcooler (6) exchanges heat in the opposite direction with the low-temperature water medium in the coil (62) to achieve secondary subcooling. The subcooled refrigerant enters the throttling device (7), and after passing through the throttling channel, the pressure and temperature drop sharply, forming a low-temperature and low-pressure gas-liquid two-phase mixture and entering the evaporator (1). S5: The low-temperature and low-pressure gas-liquid two-phase refrigerant comes into full contact with the high-temperature air in the evaporator (1), absorbs heat to achieve cooling and temperature reduction. After the refrigerant absorbs heat and heats up, it is drawn out again by the compressor (2) to complete the refrigerant refrigeration cycle and continuously cool the external environment. S6: When stopping the cooling, first turn off the compressor (2), and after the refrigerant in the refrigerant heat dissipation main circuit has completed the last cycle, turn off the fan of the evaporator (1) and the cooling fan of the microchannel radiator (3), and then turn off the water pump (8) to stop the operation of the water medium heat exchange circuit and complete the system shutdown.

9. The application method of the composite refrigeration system according to claim 8, characterized in that, In step S2, the water medium continuously circulates in the water medium heat exchange loop to achieve direct cooling of the compressor (2) and the microchannel radiator (3); in step S4, the reverse heat exchange between the refrigerant and the water medium maximizes the heat exchange efficiency and improves the refrigerant subcooling effect.

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