Double-cold-source heat pipe multi-connected energy-saving heat extraction system coupled with natural cold source and mechanical refrigeration

Abstract

The utility model discloses a double-cold-source heat pipe multi-connected energy-saving heat extraction system coupling a natural cold source and mechanical refrigeration, which comprises a plurality of water-refrigerant double-coil heat exchange units, a cooling tower and a heat pipe air conditioner all-in-one machine unit, wherein the water-refrigerant double-coil heat exchange unit is arranged in a machine room and is provided with a water coil heat exchanger and a refrigerant coil heat exchanger, the heat pipe air conditioner all-in-one machine unit comprises a heat pipe condenser, an air-cooled condenser, an expansion valve, an intermediate heat exchanger and a compressor, and the water coil heat exchanger and a cooling tower form a water circulation heat exchange loop utilizing a natural cold source. And the refrigerant coil heat exchanger, a heat pipe condenser and an intermediate heat exchanger in the heat pipe air conditioner all-in-one machine unit form a refrigerant circulating heat exchange loop in which one or combination of a natural cold source and mechanical refrigeration is selected. According to the utility model, a natural cold source and mechanical refrigeration can be selected or combined according to environmental conditions and load requirements, and the system is especially suitable for temperature control of a high-density server room.

Description

Technical Field

[0001] The utility model belongs to the field of heat exhaust in server computer rooms, relates to temperature control and energy management in data centers, and particularly relates to a dual-source heat pipe multi-connected energy-saving heat exhaust system that couples natural cold sources and mechanical refrigeration, aiming to improve the heat dissipation efficiency of computer rooms, reduce energy consumption, and meet the heat dissipation requirements of high-density server computer rooms. Background Technique

[0002] With the continuous increase in the integration density of servers, the widespread application of high-performance computing and cloud computing has further exacerbated the problem of heat accumulation inside server computer rooms. Servers in the computer room generate a large amount of heat when processing a large amount of data at high speed, especially in an environment with high-density deployment, and the amount of heat generated far exceeds that of traditional ordinary computer rooms. This high heat density not only increases the temperature inside the computer room but also poses a potential threat to the stability and lifespan of equipment. To ensure the stable operation of these key devices in a suitable temperature environment, modern computer rooms have put forward higher requirements for heat exhaust systems.

[0003] Currently, the heat dissipation technologies for server computer rooms are mainly divided into two categories: heat dissipation systems based on natural cold sources and mechanical refrigeration systems. Natural cold source heat dissipation systems mainly utilize low-temperature resources in the environment for heat exchange and have advantages such as low energy consumption and environmental protection. Mechanical refrigeration systems achieve heat dissipation through a compression refrigeration cycle and can provide a stable and controllable refrigeration effect. However, both of these systems have some limitations in practical applications. Natural cold source heat dissipation systems, such as cooling tower systems, although they can effectively utilize environmental cold sources in low-temperature seasons, their cooling capacity is greatly affected by environmental temperature. In high-temperature seasons or when environmental temperature fluctuates greatly, it is difficult to continuously provide a stable cooling effect. In addition, such systems also face challenges in humidity control and anti-freezing protection, which may affect the long-term stable operation of the system. Mechanical refrigeration systems, such as traditional compression refrigeration systems, can provide a stable refrigeration effect, but their energy consumption is relatively high. Especially in the case of annual operation, it will cause a significant increase in the operating cost of the computer room. At the same time, the refrigeration efficiency of mechanical refrigeration systems is significantly affected by environmental temperature.

[0004] In order to comprehensively utilize the advantages of natural cooling sources and mechanical refrigeration, some hybrid refrigeration systems have appeared on the market. Among them, the single-coil heat exchanger system is a common solution. This system uses cooling towers to provide natural cooling sources in low-temperature seasons, and switches to mechanical refrigeration mode when the temperature is high or the natural cooling source is insufficient. However, this system cannot achieve mixed operation of natural cooling sources and mechanical refrigeration in transitional seasons, resulting in unsatisfactory energy utilization efficiency. In addition, when dealing with rapid changes in load or extreme environmental conditions, the response speed and cooling capacity of the single-coil system may not meet the needs of high-density server rooms. In order to further improve the heat dissipation efficiency and energy-saving effect, a water-fluorine double-coil heat exchanger system has also appeared on the market. This system combines the natural cooling source of the cooling tower with the mechanical refrigeration system through an intermediate heat exchanger, which can theoretically make more full use of the natural cooling source. However, in actual applications, it is found that the synergistic efficiency of the two cooling sources in this system under different seasons and load conditions still needs to be optimized.

[0005] In summary, although the existing server room heat removal system has made some progress in heat dissipation and energy saving, it still has problems such as poor energy saving effect, poor adaptability and complex structure. Therefore, how to develop a server room heat removal system that can make more full use of natural cold sources and mechanical refrigeration and can be flexibly adjusted according to environmental and load changes to further improve the heat dissipation efficiency of the server room and significantly reduce energy consumption is a technical problem that needs to be solved urgently. Utility Model Content

[0006] 1. Technical issues

[0007] In view of the shortcomings and deficiencies of the prior art and to solve at least one of the above-mentioned and other technical problems in the prior art, the utility model provides a dual-cold source heat pipe multi-connected energy-saving heat removal system that couples natural cold source and mechanical refrigeration. Through the flexible switching and coordinated operation of natural cold source and mechanical refrigeration, the heat dissipation efficiency is improved, the energy consumption is reduced, and the stable operation of the equipment in a high heat density environment is ensured.

[0008] (II) Technical solution

[0009] The technical solution adopted by the utility model to solve its technical problems is:

[0010] A dual-cold-source heat pipe multi-connected energy-saving heat removal system that couples natural cold sources and mechanical refrigeration is used for efficient heat dissipation and energy-saving operation of high-density server rooms, and includes at least a plurality of water-refrigerant double-coil heat exchange units, a cooling tower unit, and a heat pipe air conditioning integrated unit. Specifically:

[0011] The plurality of water-refrigerant double-coil heat exchange units are arranged in a server room, and each of the water-refrigerant double-coil heat exchange units comprises at least one water coil heat exchanger and one refrigerant coil heat exchanger;

[0012] Both the cooling tower unit and the heat pipe air conditioner integrated unit are arranged outside the server room. The heat pipe air conditioner integrated unit at least includes a heat pipe condenser, an air-cooled condenser, an expansion valve, an intermediate heat exchanger and a compressor. The hot side of the air-cooled condenser, the expansion valve, the cold side of the intermediate heat exchanger and the compressor are sequentially connected through a refrigerant pipeline to form a mechanical refrigeration circuit.

[0013] Wherein,

[0014] The cold side of each water coil heat exchanger is connected to the cooling tower unit through a water pipeline, thereby forming a water circulation heat exchange circuit using natural cold source.

[0015] The cold side of each refrigerant coil heat exchanger is connected to one or both of the hot sides of the heat pipe condenser and the intermediate heat exchanger in the heat pipe air conditioner integrated unit through a refrigerant pipeline in a switchable manner, thereby forming a refrigerant circulation heat exchange circuit that alternatively or simultaneously utilizes natural cold source and mechanical refrigeration.

[0016] Preferably, a three-way valve I and a three-way valve II are provided on the refrigerant circulation heat exchange circuit. Wherein: the cold side outlet of each refrigerant coil heat exchanger is connected to the inlet of the three-way valve I through a refrigerant collecting pipe. The first outlet of the three-way valve I is connected to the hot side inlet of the heat pipe condenser through a pipeline, and the second outlet is connected to the hot side inlet of the intermediate heat exchanger through a pipeline. The cold side inlet of each refrigerant coil heat exchanger is connected to the outlet of the three-way valve II through a refrigerant distributing pipe. The first inlet of the three-way valve II is connected to the hot side outlet of the heat pipe condenser, and the second inlet is connected to the hot side outlet of the intermediate heat exchanger.

[0017] Further, when the refrigerant circulation heat exchange circuit alternatively utilizes natural cold source, the three-way valve I is adjusted so that its inlet is only connected to its first outlet, and the three-way valve II is adjusted so that its outlet is only connected to its first inlet. When the refrigerant circulation heat exchange circuit alternatively utilizes mechanical refrigeration, the three-way valve I is adjusted so that its inlet is only connected to its second outlet, and the three-way valve II is adjusted so that its outlet is only connected to its second inlet. When the refrigerant circulation heat exchange circuit simultaneously utilizes natural cold source and mechanical refrigeration, the three-way valve I is adjusted so that its inlet is simultaneously connected to its first outlet and second outlet, and the three-way valve II is adjusted so that its outlet is simultaneously connected to its first inlet and second inlet.

[0018] Further, when the natural cold source fully meets the system operation requirements, the mechanical refrigeration circuit does not start. At this time, the water circulation heat exchange circuit composed of multiple water coil heat exchangers and the cooling tower starts to operate, and the refrigerant circulation heat exchange circuit that only utilizes the natural cold source and is composed of multiple refrigerant coil heat exchangers and the heat pipe condenser starts to operate.

[0019] Further, when the natural cold source only partially meets the system operation requirements, the mechanical refrigeration circuit is turned on as a supplement. At this time, the water circulation heat exchange circuit composed of multiple water coil heat exchangers and the cooling tower starts to operate, and the refrigerant circulation heat exchange circuit that simultaneously utilizes the natural cold source and mechanical refrigeration and is composed of multiple refrigerant coil heat exchangers, the heat pipe condenser, and the intermediate heat exchanger starts to operate.

[0020] Further, when the natural cold source completely fails to meet the system operation requirements, the water circulation heat exchange circuit does not start, and only the mechanical refrigeration circuit is turned on. At this time, the refrigerant circulation heat exchange circuit that only utilizes mechanical refrigeration and is composed of multiple refrigerant coil heat exchangers and the intermediate heat exchanger starts to operate.

[0021] Preferably, a water pump is installed on the water supply pipeline between the cooling tower and each water coil heat exchanger; a refrigerant liquid storage tank and / or a refrigerant pump are optionally installed on the refrigerant liquid separation pipe between each refrigerant coil heat exchanger, the heat pipe condenser, and the intermediate heat exchanger, and the refrigerant circulation between each refrigerant coil heat exchanger and the heat pipe condenser relies on gravity drive and / or power drive.

[0022] Preferably, the water-refrigerant double-coil heat exchange unit is an in-room air conditioner installed in the air-conditioned room, or a row-level air conditioner installed between the cabinets in a row or installed above or below the enclosed passage, or installed in the form of a wind wall on the exhaust side of the cabinets in a row.

[0023] Preferably, the water-refrigerant double-coil heat exchange unit further includes a sheet metal frame and an indoor fan. The water coil heat exchanger, the refrigerant coil heat exchanger, and the indoor fan are all arranged within the sheet metal frame, and the sheet metal frame is provided with an air return opening and an air supply opening. The water coil heat exchanger is arranged adjacent to the heat source, the refrigerant coil heat exchanger is arranged downstream of the air path of the water coil heat exchanger, the indoor fan is arranged adjacent to the air outlet side of the refrigerant coil heat exchanger, and an air filter is optionally installed at the air return opening.

[0024] Preferably, the system further includes a group control box and various temperature and humidity sensors, pressure sensors, and water leakage sensors. The group control box is communicatively connected to the water-refrigerant double-coil heat exchange unit, the cooling tower, the heat pipe air-conditioning integrated machine, and various temperature and humidity sensors, pressure sensors, and water leakage sensors, so as to regulate the energy-saving and safe operation of the entire system.

[0025] (III) Technical Effects

[0026] Compared with the prior art, the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration provided by the present utility model has the following beneficial and remarkable technical effects:

[0027] (1) By introducing a water-refrigerant double-coil heat exchange unit and combining it with a cooling tower unit and a heat pipe air conditioner integrated unit, the present utility model realizes the organic combination of natural cold source and mechanical refrigeration. When the natural cold source is sufficient, it preferentially utilizes the natural cold source for cooling, effectively reducing the usage frequency of mechanical refrigeration, thereby reducing the energy consumption and operating cost of the system. In addition, the system can automatically switch the refrigeration mode according to the changes in the external environmental temperature and the computer room load, ensuring high-efficient heat dissipation performance under different seasons and load conditions. This adjustment mechanism improves the overall energy efficiency of the system. Especially in low-temperature seasons and transitional seasons, it can maximize the utilization of natural cold source and achieve remarkable energy-saving effects.

[0028] (2) The combined design of the water circulation heat exchange loop and the refrigerant circulation heat exchange loop of the present utility model realizes seamless switching between natural cold source and mechanical refrigeration. By setting the water supply pipeline and the refrigerant pipeline, the system can flexibly select or use natural cold source and mechanical refrigeration simultaneously according to the heat demand in the server computer room and the external environmental conditions. This design ensures the stable operation of the server under extremely high-temperature conditions, avoids the energy efficiency bottleneck and system failure risks brought by a single refrigeration method, and enhances the reliability and adaptability of the system.

[0029] (3) By configuring multiple water-refrigerant double-coil heat exchange units, the present utility model enhances the redundancy and stability of the system. Each heat exchange unit can operate independently, ensuring that the system can still operate normally even in the case of partial unit failures, greatly improving the reliability of the system. This modular design is also convenient for maintenance and expansion, effectively controlling the maintenance cost of the system and providing great flexibility for future expansion and upgrade.

[0030] (4) The present utility model is particularly suitable for high-density server computer rooms. Its design not only has significant energy-saving advantages but also can significantly improve the heat dissipation capacity of the computer room, ensuring the stability of the server during high-load and long-term operation. The adaptive adjustment ability of the system under different seasons and different load conditions further enhances its adaptability and reliability, making it have a wide application prospect in modern data centers and high-performance computing scenarios. Brief Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration of the present utility model.

[0032] Figure 2 Schematic diagram of the operation of the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration of the present utility model when only using the natural cold source.

[0033] Figure 3 Schematic diagram of the operation of the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration of the present utility model when preferentially using the natural cold source and then using mechanical refrigeration as a supplement.

[0034] Figure 4 Schematic diagram of the operation of the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration of the present utility model when only using mechanical refrigeration.

[0035] Description of reference numerals:

[0036] Water-refrigerant double-coil heat exchange unit 1, sheet metal frame 1-1, water coil heat exchanger 1-2, refrigerant coil heat exchanger 1-3, indoor fan 1-4, air filter 1-5, cooling tower 2, heat pipe air conditioner integrated unit 3, outdoor unit sheet metal frame 3-1, heat pipe condenser 3-2, air-cooled condenser 3-3, expansion valve 3-4, intermediate heat exchanger 3-5, compressor 3-6, outdoor fan 3-7, control system 3-8, water supply pipeline 4, return water pipeline 5, refrigerant distribution pipe 6, refrigerant collecting pipe 7, water pump 8, refrigerant liquid storage tank 9, refrigerant pump 10, group control box 11, three-way valve II 12, three-way valve I 13. Detailed implementation manners

[0037] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the following takes examples with reference to the attached drawings and further elaborates on the present utility model in detail. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. The components of the embodiments of the present utility model usually described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Embodiment 1

[0039] As a specific example, Figure 1 Schematic diagram of the structure of the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration of the present utility model. As shown in the figure, the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration of the present utility model includes multiple water-refrigerant double-coil heat exchange units 1, one cooling tower 2, and one heat pipe air conditioner integrated unit 3, wherein:

[0040] A plurality of water-refrigerant double-coil heat exchange units 1 are arranged in the machine room. Each water-refrigerant double-coil heat exchange unit 1 at least includes a sheet metal frame 1-1, a water coil heat exchanger 1-2, a refrigerant coil heat exchanger 1-3, and a set of indoor fans 1-4 disposed within the sheet metal frame 1-1. Among them, the water coil heat exchanger 1-2 is arranged adjacent to the heat source side and at least includes a water inlet and a water outlet. The refrigerant coil heat exchanger 1-3 is arranged downstream of the air path of the water coil heat exchanger 1-2 and at least includes a refrigerant inlet and a refrigerant outlet. The indoor fans 1-4 are arranged adjacent to the air outlet side of the refrigerant coil heat exchanger 1-3.

[0041] The cooling tower 2 at least includes a water inlet and a water outlet; the heat pipe air-conditioning integrated unit 3 includes an outdoor unit sheet metal frame 3-1, a set of heat pipe condensers 3-2, a set of air-cooled condensers 3-3, an expansion valve 3-4, an intermediate heat exchanger 3-5, a compressor 3-6, a set of outdoor fans 3-7, and a control system 3-8 disposed within the outdoor unit sheet metal frame 3-1. Among them, the heat pipe condenser 3-2 includes a refrigerant inlet and a refrigerant outlet; the air-cooled condenser 3-3 includes a refrigerant inlet and a refrigerant outlet; the intermediate heat exchanger 3-5 includes a hot side for circulating refrigerant and a cold side for circulating refrigerant.

[0042] The water coil heat exchanger 1-2 in each water-refrigerant double-coil heat exchange unit 1 is correspondingly connected and communicated with the water outlet and water inlet of the cooling tower 2 through its water inlet and water outlet and by means of a water supply pipe 4 and a return water pipe 5, thereby forming a water circulation heat exchange loop using natural cold sources; the refrigerant coil heat exchanger 1-3 in each water-refrigerant double-coil heat exchange unit 1 is connected and communicated with the hot sides of the heat pipe condenser 3-2 and the intermediate heat exchanger 3-5 in the heat pipe air-conditioning integrated unit 3 through its refrigerant inlet and refrigerant outlet and by means of a refrigerant distribution pipe 6 and a refrigerant collecting pipe 7, thereby forming a refrigerant heat exchange loop using natural cold sources or mechanical refrigeration; the air-cooled condenser 3-3, the expansion valve 3-4, the cold side of the intermediate heat exchanger 3-5 for circulating refrigerant, and the compressor 3-6 form a mechanical refrigeration loop through connecting pipes.

[0043] In some preferred examples, a three-way valve I 13 and a three-way valve II 12 are provided on the refrigerant circulation heat exchange loop. Among them: the cold side outlet of each refrigerant coil heat exchanger 1-3 is connected and communicated with the inlet of the three-way valve I 13 through a refrigerant collecting pipe 7. The first outlet of the three-way valve I 13 is connected to the hot side inlet of the heat pipe condenser 3-2 through a pipe, and the second outlet is connected to the hot side inlet of the intermediate heat exchanger 3-5 through a pipe; the cold side inlet of each refrigerant coil heat exchanger 1-3 is connected and communicated with the outlet of the three-way valve II 12 through a refrigerant distribution pipe 6. The first inlet of the three-way valve II 12 is connected to the hot side outlet of the heat pipe condenser 3-2, and the second inlet is connected to the hot side outlet of the intermediate heat exchanger 3-5.

[0044] Further, when the refrigerant circulation heat exchange loop alternatively utilizes natural cold sources, the three-way valve I 13 is adjusted so that its inlet communicates only with its first outlet, and the three-way valve II 12 is adjusted so that its outlet communicates only with its first inlet; when the refrigerant circulation heat exchange loop alternatively utilizes mechanical refrigeration, the three-way valve I 13 is adjusted so that its inlet communicates only with its second outlet, and the three-way valve II 12 is adjusted so that its outlet communicates only with its second inlet; when the refrigerant circulation heat exchange loop simultaneously utilizes natural cold sources and mechanical refrigeration, the three-way valve I 13 is adjusted so that its inlet communicates simultaneously with its first outlet and second outlet, and the three-way valve II 12 is adjusted so that its outlet communicates simultaneously with its first inlet and second inlet.

[0045] In some preferred examples, a water pump 8 is installed on the water supply pipeline 4 between the cooling tower 2 and each water coil heat exchanger 1-2; a refrigerant liquid storage tank 9 and a refrigerant pump 10 are optionally installed on the refrigerant liquid separation pipe 6, and the refrigerant circulation between the refrigerant coil heat exchanger 1-3 and the heat pipe air conditioner integrated unit 3 can be driven by gravity or by power.

[0046] In some preferred examples, the water-refrigerant double coil heat exchange unit 1 is an in-room air conditioner installed in an air-conditioned room, or a row-level air conditioner installed between rows of cabinets or above or below a closed passage, or installed in the form of an air wall on the exhaust side of rows of cabinets.

[0047] In some preferred examples, the water-refrigerant double coil heat exchange unit 1 has an air return opening and an air supply opening. According to the usage place, an air filter 1-5 is optionally installed at the air return opening of the water-refrigerant double coil heat exchange unit 1 to effectively filter dust and particulate matter in the air entering the water-refrigerant double coil heat exchange unit 1.

[0048] In some preferred examples, the system further includes a group control box 11 and various temperature and humidity sensors, pressure sensors, and water leakage sensors. The group control box 11 is communicatively connected to the water-refrigerant double coil heat exchange unit 1, the cooling tower 2, the heat pipe air conditioner integrated unit 3, and various temperature and humidity sensors, pressure sensors, and water leakage sensors, so as to control the energy-saving and safe operation of the entire system.

[0049] Example 2

[0050] Figure 2Schematic diagram of the operation of the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cooling source and mechanical refrigeration of the present utility model when only using the natural cooling source. As shown in the figure, for the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cooling source and mechanical refrigeration of the present utility model, when the natural cooling source fully meets the system operation requirements, the system operates the water circulation heat exchange loop and the refrigerant heat exchange loop that utilizes the natural cooling source. At this time, the water circulation heat exchange loop composed of multiple water coil heat exchangers 1-2 and the cooling tower 2 starts to operate (the water flow direction in the loop is as shown by arrow A in the figure), and the refrigerant heat exchange loop that utilizes the natural cooling source composed of multiple refrigerant coil heat exchangers 1-3 and the heat pipe condenser 3-2 starts to operate (the refrigerant flow direction in the loop is as shown by arrow B in the figure); the mechanical refrigeration loop composed of the air-cooled condenser 3-3, the expansion valve 3-4, the cold side of the intermediate heat exchanger 3-5 through which the refrigerant flows, and the compressor 3-6 through the connecting pipeline does not start to operate.

[0051] Embodiment 3

[0052] Figure 3 Schematic diagram of the operation of the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cooling source and mechanical refrigeration of the present utility model when preferentially using the natural cooling source and then using mechanical refrigeration as a supplement. As shown in the figure, for the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cooling source and mechanical refrigeration of the present utility model, when the natural cooling source does not fully meet the system operation requirements, mechanical refrigeration is turned on as a supplement. At this time, the system operates the water circulation heat exchange loop and the refrigerant heat exchange loop that utilizes the natural cooling source and mechanical refrigeration. At this time, the water circulation heat exchange loop composed of multiple water coil heat exchangers 1-2 and the cooling tower 2 starts to operate (the water flow direction in the loop is as shown by arrow A in the figure), and the refrigerant heat exchange loop that utilizes the natural cooling source and mechanical refrigeration composed of multiple refrigerant coil heat exchangers 1-3, the heat pipe condenser 3-2, and the hot side of the intermediate heat exchanger 3-5 through which the refrigerant flows starts to operate (the refrigerant flow direction in the loop is as shown by arrow C in the figure); the mechanical refrigeration loop composed of the air-cooled condenser 3-3, the expansion valve 3-4, the cold side of the intermediate heat exchanger 3-5 through which the refrigerant flows, and the compressor 3-6 through the connecting pipeline also starts to operate (the refrigerant flow direction in the loop is as shown by arrow D in the figure) for refrigeration supplement.

[0053] Embodiment 4

[0054] Figure 4Schematic diagram of the operation of the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration when only mechanical refrigeration is used. As shown in the figure, for the dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration of the present invention, when the natural cold source does not meet the system operation requirements, only mechanical refrigeration is turned on. At this time, the refrigerant heat exchange circuit that utilizes mechanical refrigeration and is composed of the hot sides of the refrigerant in the multiple refrigerant coil heat exchangers 1-3 and the intermediate heat exchanger 3-5 starts to operate (the refrigerant flow direction in the circuit is shown by the arrow E in the figure); the mechanical refrigeration circuit composed of the air-cooled condenser 3-3, the expansion valve 3-4, the cold side of the refrigerant flowing through the intermediate heat exchanger 3-5, and the compressor 3-6 starts to operate through the connecting pipelines (the refrigerant flow direction in the circuit is shown by the arrow D in the figure), providing a cold source that meets the requirements for the system.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dual-cooling-source heat pipe multi-connected energy-saving heat rejection system coupling natural cold source and mechanical refrigeration, which is used for the efficient heat dissipation and energy-saving operation of a high-density server room, and at least includes multiple water-refrigerant double-coil heat exchange units, a cooling tower unit, and a heat pipe air-conditioning integrated machine unit, and is characterized in that: The multiple water-refrigerant double-coil heat exchange units are arranged in the server room, and each of the water-refrigerant double-coil heat exchange units at least includes a water coil heat exchanger and a refrigerant coil heat exchanger; The cooling tower unit and the heat pipe air-conditioning integrated machine unit are both arranged outside the server room. The heat pipe air-conditioning integrated machine unit at least includes a heat pipe condenser, an air-cooled condenser, an expansion valve, an intermediate heat exchanger, and a compressor. The hot side of the air-cooled condenser, the expansion valve, the cold side of the intermediate heat exchanger, and the compressor are sequentially connected through a refrigerant pipeline and form a mechanical refrigeration circuit; Wherein, The cold side of each water coil heat exchanger is connected to the cooling tower unit through a water pipeline, thereby forming a water circulation heat exchange circuit using natural cold source; The cold side of each refrigerant coil heat exchanger is connected to one or both of the hot sides of the heat pipe condenser and the intermediate heat exchanger in the heat pipe air-conditioning integrated machine unit through a refrigerant pipeline in a switchable manner, thereby forming a refrigerant circulation heat exchange circuit that alternatively or simultaneously uses natural cold source and mechanical refrigeration.

2. The dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration according to claim 1, wherein A three-way valve I and a three-way valve II are provided on the refrigerant circulation heat exchange circuit. Among them: the cold side outlet of each refrigerant coil heat exchanger is connected to the inlet of the three-way valve I through a refrigerant collector pipe, the first outlet of the three-way valve I is connected to the hot side inlet of the heat pipe condenser through a pipeline, and the second outlet is connected to the hot side inlet of the intermediate heat exchanger through a pipeline; the cold side inlet of each refrigerant coil heat exchanger is connected to the outlet of the three-way valve II through a refrigerant distributor pipe, the first inlet of the three-way valve II is connected to the hot side outlet of the heat pipe condenser, and the second inlet is connected to the hot side outlet of the intermediate heat exchanger.

3. The dual-cooling-source heat pipe multi-connected energy-saving heat rejection system coupling natural cold source and mechanical refrigeration according to claim 2, characterized in that, When the refrigerant circulation heat exchange circuit alternatively uses natural cold source, the three-way valve I is adjusted so that its inlet is only connected to its first outlet, and the three-way valve II is adjusted so that its outlet is only connected to its first inlet; when the refrigerant circulation heat exchange circuit alternatively uses mechanical refrigeration, the three-way valve I is adjusted so that its inlet is only connected to its second outlet, and the three-way valve II is adjusted so that its outlet is only connected to its second inlet; when the refrigerant circulation heat exchange circuit simultaneously uses natural cold source and mechanical refrigeration, the three-way valve I is adjusted so that its inlet is simultaneously connected to its first outlet and second outlet, and the three-way valve II is adjusted so that its outlet is simultaneously connected to its first inlet and second inlet.

4. The dual-cooling-source heat pipe multi-connected energy-saving heat rejection system coupling natural cold source and mechanical refrigeration according to claim 3, characterized in that, When the natural cold source fully meets the system operation requirements, the mechanical refrigeration circuit does not start. At this time, the water circulation heat exchange circuit composed of multiple water coil heat exchangers and the cooling tower starts to operate, and the refrigerant circulation heat exchange circuit that only uses natural cold source and is composed of multiple refrigerant coil heat exchangers and the heat pipe condenser starts to operate.

5. The dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples a natural cold source and mechanical refrigeration according to claim 3, wherein When the natural cold source only partially meets the system operation requirements, the mechanical refrigeration circuit is turned on as a supplement. At this time, the water circulation heat exchange circuit composed of multiple water coil heat exchangers and the cooling tower starts to operate, and the refrigerant circulation heat exchange circuit that simultaneously utilizes the natural cold source and mechanical refrigeration, composed of multiple refrigerant coil heat exchangers, the heat pipe condenser, and the intermediate heat exchanger, starts to operate.

6. The dual-cooling-source heat pipe multi-connection energy-saving heat rejection system coupling natural cold source and mechanical refrigeration according to claim 3, wherein When the natural cold source completely fails to meet the system operation requirements, the water circulation heat exchange circuit does not start, and only the mechanical refrigeration circuit is turned on. At this time, the refrigerant circulation heat exchange circuit that only utilizes mechanical refrigeration, composed of multiple refrigerant coil heat exchangers and the intermediate heat exchanger, starts to operate.

7. The dual-source heat pipe multi-connected energy-saving heat rejection system coupling natural cold source and mechanical refrigeration according to claim 1, characterized in that, A water pump is installed on the water supply pipeline between the cooling tower and each water coil heat exchanger; a refrigerant liquid storage tank and / or a refrigerant pump are optionally installed on the refrigerant liquid separation pipe between each refrigerant coil heat exchanger, the heat pipe condenser, and the intermediate heat exchanger, and the refrigerant circulation between each refrigerant coil heat exchanger and the heat pipe condenser relies on gravity drive and / or power drive.

8. The dual-cooling-source heat pipe multi-connected energy-saving heat rejection system coupling natural cold source and mechanical refrigeration according to claim 1, characterized in that, The water-refrigerant double-coil heat exchange unit is installed in the air-conditioned room as a computer room air conditioner, or installed between the rows of cabinets as a row-level air conditioner, or installed above or below the enclosed passage, or installed in the form of a wind wall on the exhaust side of the rows of cabinets.

9. The dual-cooling-source heat pipe multi-connected energy-saving heat rejection system that couples natural cold source and mechanical refrigeration, characterized in that, The water-refrigerant double-coil heat exchange unit further includes a sheet metal frame and an indoor fan. The water coil heat exchanger, the refrigerant coil heat exchanger, and the indoor fan are all arranged within the sheet metal frame, and the sheet metal frame is provided with an air return opening and an air supply opening. The water coil heat exchanger is arranged adjacent to the heat source, the refrigerant coil heat exchanger is arranged downstream of the air path of the water coil heat exchanger, the indoor fan is arranged adjacent to the air outlet side of the refrigerant coil heat exchanger, and an air filter is optionally installed at the air return opening.

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