Heat pipe multi-connection energy-saving heat extraction system suitable for server room

Abstract

The utility model provides a heat pipe multi-connection energy-saving heat extraction system suitable for a server room, which comprises a plurality of double-coil indoor heat extraction units, a water-refrigerant intermediate heat exchanger I, a water-refrigerant intermediate heat exchanger II, a cooling tower I, a cooling tower II, a refrigeration host and a water-water heat exchanger, each double-coil indoor heat extraction unit comprises a refrigerant coil heat exchanger I and a refrigerant coil heat exchanger II, and a plurality of refrigerant coil heat exchangers I close to a heat source utilize a natural cold source provided by a cooling tower I through a water-refrigerant intermediate heat exchanger I; the refrigerant coil heat exchanger II far away from the heat source preferentially utilizes the natural cold source provided by the cooling tower II and then utilizes the mechanical cold source provided by the refrigeration host through the water-refrigerant intermediate heat exchanger II; the system adopts a heat pipe multi-connection mode, water does not enter the machine room while a natural cold source is fully utilized, energy-saving and reliable operation of the system all the year round is guaranteed, and the system is particularly suitable for heat extraction of a high-density server machine room.

Description

Technical Field

[0001] The utility model belongs to the field of heat exhaust and energy saving technology for server rooms, and relates to a heat exhaust system for high-density server rooms. Specifically, it is an energy-saving heat exhaust system based on heat pipe technology and multi-connected refrigeration technology. By combining natural cold sources with mechanical refrigeration, it achieves an efficient and flexible heat dissipation method. It is particularly suitable for server rooms with high temperature control requirements, ensuring stable operation of equipment under high load. Background Art

[0002] Traditional server room cooling systems primarily utilize centralized air conditioning or row-mounted air conditioners. While these systems can meet basic cooling needs, they suffer from high energy consumption and low cooling efficiency. Centralized air conditioning systems must distribute cold air throughout the entire room, resulting in significant energy loss. While row-mounted air conditioners can achieve localized, precise cooling, the distance between the cooling source and the heat source still results in significant energy loss during transmission. Furthermore, these systems often struggle to flexibly adjust cooling capacity to accommodate changes in server load, leading to energy waste.

[0003] Heat pipe technology, as a highly efficient heat transfer method, has been widely used in the field of electronic equipment cooling. Heat pipes utilize the phase change process of a working fluid to achieve heat transfer, offering the advantages of low thermal resistance and high heat transfer efficiency. However, applying heat pipe technology to the overall cooling system of large server rooms still faces numerous challenges. First, how to design large-scale, long-distance heat pipe systems to ensure their reliability and efficiency; second, how to organically combine heat pipe technology with natural cooling sources and mechanical refrigeration to achieve the coordinated operation of multiple cooling methods; and third, how to solve the problem of adjusting the heat pipe system under different load and environmental conditions to ensure system stability and flexibility.

[0004] Multi-split air conditioning systems are widely used in building air conditioning due to their flexibility and energy efficiency. A single outdoor unit drives multiple indoor units, enabling zoned control and load matching. However, applying multi-split systems to server rooms presents several technical challenges. First, server rooms have significantly higher cooling requirements than typical buildings, raising the question of how to improve the cooling capacity and efficiency of multi-split systems. Second, server rooms require higher precision in temperature and humidity control, necessitating more accurate temperature regulation. Third, multi-split systems typically utilize a refrigerant cycle, raising the question of how to prevent potential damage to servers from refrigerant leaks.

[0005] Furthermore, existing server room cooling systems commonly allow water to enter the room. This not only increases the risk of water leakage but can also affect the stability of the room environment due to condensation on the pipes. Preventing water from entering the room while maintaining cooling efficiency, thereby improving system safety and reliability, is a pressing technical challenge.

[0006] In summary, there are some technical problems in the field of server room refrigeration technology that need to be solved urgently. These problems include how to design a server room refrigeration system that can make full use of natural cold sources while taking into account the standby capacity of mechanical refrigeration, and has high efficiency, high reliability, and high flexibility; how to organically combine heat pipe technology and multi-connected technology to achieve efficient heat transfer over a large scale and long distance; how to ensure the refrigeration effect and improve system safety while avoiding the entry of water systems into the computer room; and how to achieve intelligent adjustment according to load changes and environmental conditions to minimize energy consumption. Summary of the Invention

[0007] In view of the defects and deficiencies of the existing server room refrigeration systems, such as high energy consumption, low refrigeration efficiency, difficulty in flexible adjustment according to load changes, and potential leakage risks brought by the entry of water systems into the computer room, in order to solve at least one of the above and other technical problems in the prior art, the present utility model aims to provide a heat pipe multi-connected energy-saving heat rejection system applicable to server rooms. Through the combination of heat pipe multi-connected technology, double-coil design, water-fluorine intermediate heat exchanger, and multiple circulation loops, the efficient heat pipe technology is combined with the multi-connected refrigeration system to achieve flexible switching between natural cold source and mechanical refrigeration, safe operation without water entering the computer room, and refrigeration effect with high energy efficiency throughout the year. At the same time, the reliability and adaptability of the system are improved to meet the temperature control requirements under high load conditions in server rooms.

[0008] The technical solution adopted by the present utility model to solve its technical problems is as follows:

[0009] A heat pipe multi-connected energy-saving heat rejection system applicable to server rooms includes multiple double-coil indoor heat rejection units placed in the computer room, at least one water-refrigerant intermediate heat exchanger I and one water-refrigerant intermediate heat exchanger II placed in the air-conditioning room, and at least one cooling tower I, one cooling tower II, a refrigeration host, and a water-water heat exchanger placed outside the computer room. Specifically:

[0010] Each of the double-coil indoor heat rejection units includes at least one refrigerant coil heat exchanger I and one refrigerant coil heat exchanger II, wherein:

[0011] Each of the refrigerant coil heat exchangers I is connected to the hot side of the water-refrigerant intermediate heat exchanger I through a pipeline to form a first refrigerant circulation heat exchange loop that utilizes natural cold sources, and the cold side of the water-refrigerant intermediate heat exchanger I is connected to the cooling tower I through a pipeline to form a first chilled water circulation heat exchange loop;

[0012] Each of the refrigerant coil heat exchangers II is connected to the hot side of the water-refrigerant intermediate heat exchanger II through pipelines, forming a second refrigerant circulation heat exchange loop that combines natural cold source and mechanical refrigeration or uses them alternatively. The cold side of the water-refrigerant intermediate heat exchanger II, the hot side of the water-water heat exchanger, and the chilled water flow side of the refrigeration main unit are connected in sequence through pipelines, forming a second chilled water circulation heat exchange loop that combines natural cold source and mechanical refrigeration or uses them alternatively. The cooling tower II, the cold side of the water-water heat exchanger, and the cooling water flow side of the refrigeration main unit are connected in sequence through pipelines, forming a cooling water circulation heat exchange loop;

[0013] And among them,

[0014] A bypass pipeline I with a control valve I is provided between the chilled water inlet and the chilled water outlet on the hot side of the water-water heat exchanger, and a bypass pipeline II with a control valve II is provided between the cooling water inlet and the cooling water outlet on the cold side; A bypass pipeline III with a control valve III is provided between the inlet and the outlet on the chilled water flow side of the refrigeration main unit, and a bypass pipeline IV with a control valve IV is provided between the inlet and the outlet on the cooling water flow side.

[0015] Preferably, each of the double-coil indoor heat rejection units further includes a sheet metal frame and a plurality of indoor fans. The refrigerant coil heat exchanger I, the refrigerant coil heat exchanger II, and each indoor fan are arranged within the sheet metal frame. Among them, the refrigerant coil heat exchanger I is arranged adjacent to the heat source, the refrigerant coil heat exchanger II is arranged downstream of the air path of the refrigerant coil heat exchanger I, and the indoor fans are arranged adjacent to the air outlet side of the refrigerant coil heat exchanger II.

[0016] Preferably, the arrangement position of the bottom of the water-refrigerant intermediate heat exchanger I is higher than the arrangement position of the top of the refrigerant coil heat exchanger I, so that the first refrigerant circulation heat exchange loop is driven by gravity.

[0017] Preferably, the arrangement position of the bottom of the water-refrigerant intermediate heat exchanger II is higher than the arrangement position of the top of the refrigerant coil heat exchanger II, so that the second refrigerant circulation heat exchange loop is driven by gravity.

[0018] Preferably, a water pump I is installed on the first chilled water circulation heat exchange loop, a water pump II is installed on the second chilled water circulation heat exchange loop, and a water pump III is installed on the cooling water circulation heat exchange loop.

[0019] Preferably, when the natural cold source is sufficient and only starting the cooling tower I can meet the operation requirements of the system, the first refrigerant circulation heat exchange loop and the first chilled water circulation heat exchange loop are started and operated, and the cooling tower II, the refrigeration main unit, and the water-water heat exchanger are not started and operated.

[0020] Preferably, when the natural cold source is sufficient and only starting the Cooling Tower Ⅰ and Cooling Tower Ⅱ to utilize the pure natural cold source can meet the system operation requirements, the first refrigerant circulation heat exchange loop and the first chilled water circulation heat exchange loop are started and operated; the second chilled water circulation heat exchange loop only utilizes the natural cold source, the control valve Ⅰ and the control valve Ⅱ are closed, the control valve Ⅲ and the control valve Ⅳ are opened, so as to correspondingly close the bypass pipeline Ⅰ and the bypass pipeline Ⅱ, and open the bypass pipeline Ⅲ and the bypass pipeline Ⅳ, such that the cold side of the water-refrigerant intermediate heat exchanger Ⅱ bypasses the chilled water flow side of the refrigeration host and only forms a chilled water circulation between the hot side of the water-water heat exchanger, and makes the cold side of the water-water heat exchanger bypass the cooling water flow side of the refrigeration host and only form a cooling water circulation between the cold side of the water-water heat exchanger and the Cooling Tower Ⅱ. At this time, the Cooling Tower Ⅱ, the cold side of the water-water heat exchanger and the cooling water circulation heat exchange loop connected by pipelines therebetween are started and operated, and provide chilled water cooled by the natural cold source for the cold side of the water-refrigerant intermediate heat exchanger Ⅱ, the hot side of the water-water heat exchanger and the second chilled water circulation heat exchange loop connected by pipelines therebetween; the second refrigerant circulation heat exchange loop is started and operated to exchange heat with the chilled water on the cold side of the water-refrigerant intermediate heat exchanger Ⅱ, thereby condensing the refrigerant vapor that absorbs the server heat in each refrigerant coil heat exchanger Ⅱ in the second refrigerant circulation heat exchange loop into a refrigerant liquid.

[0021] Preferably, when the natural cold source can be utilized but is insufficient, while starting the Cooling Tower Ⅰ and Cooling Tower Ⅱ to utilize the natural cold source, the refrigeration host is also started for refrigeration supplement to meet the system operation requirements. At this time, the first refrigerant circulation heat exchange circuit and the first chilled water circulation heat exchange circuit are started and operated; the second chilled water circulation heat exchange circuit utilizes both the natural cold source and mechanical refrigeration simultaneously. The control valves Ⅰ, Ⅱ, Ⅲ, and Ⅳ are closed to correspondingly close the bypass pipelines Ⅰ, Ⅱ, Ⅲ, and Ⅳ, so that a chilled water circulation is formed among the cold side of the water-refrigerant intermediate heat exchanger Ⅱ, the hot side of the water-water heat exchanger, and the chilled water flow side of the refrigeration host, and a cooling water circulation is formed among the cold side of the water-water heat exchanger, the cooling water flow side of the refrigeration host, and Cooling Tower Ⅱ. At this time, the cooling water circulation heat exchange circuit connected by pipelines among Cooling Tower Ⅱ, the cold side of the water-water heat exchanger, and the cooling water flow side of the refrigeration host is started and operated to provide chilled water using a combination of natural cold source and mechanical refrigeration for the second chilled water circulation heat exchange circuit connected by pipelines among the cold side of the water-refrigerant intermediate heat exchanger Ⅱ, the hot side of the water-water heat exchanger, and the chilled water flow side of the refrigeration host; first, the natural cold source is used for precooling, and then the refrigeration host is used to produce chilled water meeting the temperature requirements through mechanical refrigeration; the second refrigerant circulation heat exchange circuit is started and operated to exchange heat with the chilled water on the cold side of the water-refrigerant intermediate heat exchanger Ⅱ, thereby condensing the refrigerant vapor that absorbs the server heat in the refrigerant coil heat exchanger Ⅱ in the second refrigerant circulation heat exchange circuit into refrigerant liquid.

[0022] Preferably, when the natural cold source does not meet the usage conditions, only the refrigeration host is started for refrigeration to meet the system operation requirements. At this time, the chilled water circulation heat exchange circuit only utilizes mechanical refrigeration. The control valves Ⅰ and Ⅱ are opened, and the control valves Ⅲ and Ⅳ are closed to correspondingly open the bypass pipelines Ⅰ and Ⅱ and close the bypass pipelines Ⅲ and Ⅳ, so that the cold side of the water-refrigerant intermediate heat exchanger Ⅱ bypasses the hot side of the water-water heat exchanger and only forms a chilled water circulation with the chilled water flow side of the refrigeration host, and the cooling water bypasses the cold side of the water-water heat exchanger, and only the cooling water flow side of the refrigeration host and Cooling Tower Ⅱ form a cooling water circulation; at this time, the cooling water circulation heat exchange circuit connected by pipelines among Cooling Tower Ⅱ, the cooling water flow side of the refrigeration host and the two is started and operated, and the second chilled water circulation heat exchange circuit connected by pipelines between the cold side of the water-refrigerant intermediate heat exchanger Ⅱ and the chilled water flow side of the refrigeration host provides chilled water that only utilizes mechanical refrigeration; the second refrigerant circulation heat exchange circuit is started and operated to exchange heat with the chilled water on the cold side of the water-refrigerant intermediate heat exchanger Ⅱ, thereby condensing the refrigerant vapor that absorbs the server heat in the refrigerant coil heat exchanger Ⅱ in the second refrigerant circulation heat exchange circuit into refrigerant liquid.

[0023] Preferably, the double-coil indoor heat exhaust unit can be an in-rack air conditioner installed in the air-conditioned room, or a row-level air conditioner installed between rows of cabinets or above or below the enclosed passage, or installed in the form of an air wall on the exhaust side of the rows of cabinets.

[0024] Preferably, the double-coil indoor heat exhaust unit has a return air outlet and a supply air outlet. According to the usage place, an air filter can be optionally installed at the return air outlet of the double-coil indoor heat exhaust unit to effectively filter dust and particulate matter in the air entering the double-coil indoor heat exhaust unit.

[0025] Compared with the prior art, the heat pipe multi-connected energy-saving heat exhaust system applicable to server computer rooms provided by the present invention has the following beneficial and remarkable technical effects:

[0026] (1) In the heat pipe multi-connected energy-saving heat exhaust system applicable to server computer rooms provided by the present invention, by setting multiple circulating heat exchange circuits, multiple refrigerant coil heat exchangers I close to the heat source utilize the natural cold source provided by the cooling tower I through the water-refrigerant intermediate heat exchanger I; the refrigerant coil heat exchanger II far from the heat source, through the water-refrigerant intermediate heat exchanger II, preferentially utilizes the natural cold source provided by the cooling tower II, and secondly utilizes the mechanical cold source provided by the refrigeration host; this method gives full play to the advantages of the natural cold source, reduces the use of mechanical refrigeration, and thus significantly reduces the energy consumption of the system.

[0027] (2) In the heat pipe multi-connected energy-saving heat exhaust system applicable to server computer rooms provided by the present invention, the heat pipe multi-connected method is adopted. There are two refrigerant coil heat exchangers in each double-coil indoor heat exhaust unit. The refrigerant coil heat exchanger I close to the heat source preferentially utilizes the natural cold source for heat dissipation, and the fluorine coil heat exchanger II far from the heat source starts the refrigeration host when the natural cold source is insufficient. This multi-connected design makes full use of the natural cold source and improves the overall heat dissipation efficiency of the system.

[0028] (3) In the heat pipe multi-connected energy-saving heat exhaust system applicable to server computer rooms provided by the present invention, the water-refrigerant intermediate heat exchanger is used to isolate the water side and the refrigerant side. While making full use of the natural cold source, water does not enter the computer room, which not only reduces the risk of water leakage, but also avoids the influence of water pipe condensation on the computer room environment, ensuring the annual energy-saving and reliable operation of the system.

[0029] (4)The heat pipe multi - unit energy - saving heat - exhaust system for server rooms provided by the present utility model adopts multiple operation modes and can be flexibly switched according to the situation of natural cold sources. When natural cold sources are sufficient, the pure natural cold source mode is adopted; when natural cold sources are insufficient, the mode of combining natural cold sources with mechanical refrigeration is adopted; when natural cold sources are unavailable, the pure mechanical refrigeration mode is adopted. This flexible operation strategy ensures that the system can adapt to different climate conditions and operate efficiently throughout the year, especially suitable for high - density server rooms. Brief Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the heat pipe multi - unit energy - saving heat - exhaust system for server rooms of the present utility model.

[0031] Figure 2 It is a schematic structural diagram of the heat pipe multi - unit energy - saving heat - exhaust system for server rooms of the present utility model when only cooling tower Ⅰ is started to utilize natural cold sources.

[0032] Figure 3 It is a schematic structural diagram of the heat pipe multi - unit energy - saving heat - exhaust system for server rooms of the present utility model when only cooling tower Ⅰ and cooling tower Ⅱ are started to utilize pure natural cold sources.

[0033] Figure 4 It is a schematic structural diagram of the heat pipe multi - unit energy - saving heat - exhaust system for server rooms of the present utility model when cooling tower Ⅰ, cooling tower Ⅱ and refrigeration host are started to utilize natural cold sources and mechanical refrigeration simultaneously.

[0034] Figure 5 It is a schematic structural diagram of the heat pipe multi - unit energy - saving heat - exhaust system for server rooms of the present utility model when only the refrigeration host is started to use mechanical refrigeration.

[0035] Description of the Reference Numerals:

[0036] Dual - coil indoor heat - exhaust unit 1, sheet metal frame 1 - 1, refrigerant coil heat exchanger Ⅰ 1 - 2, refrigerant coil heat exchanger Ⅱ 1 - 3, indoor fan 1 - 4, air filter 1 - 5, water - refrigerant intermediate heat exchanger Ⅰ 2, water - refrigerant intermediate heat exchanger Ⅱ 3, cooling tower Ⅰ 4, cooling tower Ⅱ 5, refrigeration host 6, control valve Ⅲ 6 - 1, control valve Ⅳ 6 - 2, water - water heat exchanger 7, control valve Ⅰ 7 - 1, control valve Ⅱ 7 - 2, water pump Ⅰ 8, water pump Ⅱ 9, water pump Ⅲ 10, group control box 11. Detailed Description of the Embodiment

[0037] To make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the following takes examples with reference to the attached drawings to further elaborate 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. Generally, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] The present utility model aims to provide a heat pipe multi-connected energy-saving heat rejection system applicable to server rooms. Through the combination of heat pipe multi-connected technology, double-coil design, water-fluorine intermediate heat exchanger and multiple circulation loops, the efficient heat pipe technology is combined with the multi-connected refrigeration system to achieve flexible switching between natural cold source and mechanical refrigeration, safe operation without water entering the computer room, and annual high-efficiency energy-saving refrigeration effect. At the same time, the reliability and adaptability of the system are improved to meet the temperature control requirements under high-load conditions in server rooms.

[0039] Figure 1 It is a schematic structural diagram of the heat pipe multi-connected energy-saving heat rejection system applicable to server rooms of the present utility model. As shown in the figure, the heat pipe multi-connected energy-saving heat rejection system applicable to server rooms of the present utility model includes multiple double-coil indoor heat rejection units 1 placed in the computer room, at least one water-refrigerant intermediate heat exchanger I 2, one water-refrigerant intermediate heat exchanger II 3 placed in the air-conditioning room, and at least one cooling tower I 4, one cooling tower II 5, one refrigeration host 6, and one water-water heat exchanger 7 placed outside the computer room, where:

[0040] Each of the multiple double-coil indoor heat rejection units 1 at least includes a sheet metal frame 1-1 and a refrigerant coil heat exchanger I 1-2, a refrigerant coil heat exchanger II 1-3, and multiple indoor fans 1-4 arranged in the sheet metal frame 1-1. The refrigerant coil heat exchanger I 1-2 is arranged adjacent to the heat source and at least includes a refrigerant inlet and a refrigerant outlet; the refrigerant coil heat exchanger II 1-3 is arranged downstream of the air path of the refrigerant coil heat exchanger I 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 II 1-3.

[0041] The water-refrigerant intermediate heat exchanger Ⅰ 2 includes a hot side through which refrigerant flows and a cold side through which chilled water flows. The hot side includes a refrigerant inlet and a refrigerant outlet, and the cold side includes a chilled water inlet and a chilled water outlet. The water-refrigerant intermediate heat exchanger Ⅱ 3 includes a hot side through which refrigerant flows and a cold side through which chilled water flows. The hot side includes a refrigerant inlet and a refrigerant outlet, and the cold side includes a chilled water inlet and a chilled water outlet. The cooling tower Ⅰ 4 includes at least a chilled water inlet and a chilled water outlet. The cooling tower Ⅱ 5 includes at least a cooling water inlet and a cooling water outlet. The refrigeration host 6 includes a chilled water flow-through side and a cooling water flow-through side. The chilled water flow-through side includes at least a chilled water inlet and a chilled water outlet, and the cooling water flow-through side includes at least a cooling water inlet and a cooling water outlet. The water-water heat exchanger 7 includes a hot side through which chilled water flows and a cold side through which cooling water flows. The hot side through which chilled water flows includes at least a chilled water inlet and a chilled water outlet, and the cold side through which cooling water flows includes at least a cooling water inlet and a cooling water outlet.

[0042] Each refrigerant coil heat exchanger Ⅰ 1-2 is connected to the hot side of the water-refrigerant intermediate heat exchanger Ⅰ 2 through a pipeline to form a first refrigerant circulation heat exchange loop that utilizes natural cold source. The cold side of the water-refrigerant intermediate heat exchanger Ⅰ 2 and the cooling tower Ⅰ 4 are connected through a pipeline to form a first chilled water circulation heat exchange loop. Each refrigerant coil heat exchanger Ⅱ 1-3 is connected to the hot side of the water-refrigerant intermediate heat exchanger Ⅱ 3 through a pipeline to form a second refrigerant circulation heat exchange loop that combines natural cold source with mechanical refrigeration. The cold side of the water-refrigerant intermediate heat exchanger Ⅱ 3, the hot side of the water-water heat exchanger 7, and the chilled water flow-through side of the refrigeration host 6 are connected in sequence through a pipeline to form a second chilled water circulation heat exchange loop that combines natural cold source with mechanical refrigeration. The cooling tower Ⅱ 5, the cold side of the water-water heat exchanger 7, and the cooling water flow-through side of the refrigeration host 6 are connected in sequence through a pipeline to form a cooling water circulation heat exchange loop.

[0043] A bypass pipeline I with a control valve I 7-1 is provided between the chilled water inlet and the chilled water outlet on the hot side of the water-water heat exchanger 7, and a bypass pipeline II with a control valve II 7-2 is provided between the cooling water inlet and the cooling water outlet on the cold side; a bypass pipeline III with a control valve III 6-1 is provided between the inlet and the outlet on the chilled water flow side of the refrigeration main unit 6, and a bypass pipeline IV with a control valve IV 6-2 is provided between the inlet and the outlet on the cooling water flow side; the layout position of the bottom of the water-refrigerant intermediate heat exchanger I 2 is higher than the layout position of the top of the refrigerant coil heat exchanger I 1-2, so that the first refrigerant circulation heat exchange loop using natural cold source formed between the refrigerant coil heat exchanger I 1-2 and the hot side of the water-refrigerant intermediate heat exchanger I 2 is driven by gravity; the layout position of the bottom of the water-refrigerant intermediate heat exchanger II 3 is higher than the layout position of the top of the refrigerant coil heat exchanger II 1-3, so that the second refrigerant circulation heat exchange loop of natural cold source and mechanical refrigeration combination formed between the refrigerant coil heat exchanger II 1-3 and the hot side of the water-refrigerant intermediate heat exchanger II 3 is driven by gravity.

[0044] In some preferred examples, a water pump I 8 is preferably installed on the first chilled water circulation heat exchange loop, a water pump II 9 is installed on the second chilled water circulation heat exchange loop, and a water pump III 10 is installed on the cooling water circulation heat exchange loop; the double-coil indoor heat rejection unit 1 can be a computer room air conditioner installed in the air-conditioned room, or a row-level air conditioner installed between the rows of cabinets 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; the double-coil indoor heat rejection unit 1 has a return air outlet and a supply air outlet. According to the use place, an air filter 1-5 can be optionally installed at the return air outlet of the double-coil indoor heat rejection unit 1 to effectively filter the dust and particulate matter in the air entering the double-coil indoor heat rejection unit 1; the system can also include a group control box 11 and various temperature and humidity sensors, pressure sensors, water leakage sensors, etc. The group control box 11 is communicatively connected with the double-coil indoor heat rejection unit 1, the water-refrigerant intermediate heat exchanger I 2, the water-refrigerant intermediate heat exchanger II 3, the cooling tower I 4, the cooling tower II 5, the refrigeration main unit 6, the water-water heat exchanger 7 and various temperature and humidity sensors, pressure sensors, water leakage sensors, etc., so as to regulate the energy-saving and safe operation of the whole system.

[0045] Figure 2 It is a schematic structural diagram of the heat pipe multi-connected energy-saving heat rejection system of the present invention applicable to a server room when only the cooling tower I is started to utilize natural cold source. As Figure 2As shown, when the natural cold source is sufficient and only starting the cooling tower Ⅰ 4 can meet the operation requirements of the system, the first refrigerant circulation heat exchange loop in which the hot sides of multiple refrigerant coil heat exchangers Ⅰ 1-2 and the water-refrigerant intermediate heat exchanger Ⅰ 2 are connected through pipelines starts to operate. At this time, the refrigerant flow direction in the loop is as shown by arrow A in the figure; the cold side of the water-refrigerant intermediate heat exchanger Ⅰ 2 and the cooling tower Ⅰ 4 are connected through pipelines to start the operation of the first chilled water circulation heat exchange loop. At this time, the chilled water flow direction in the loop is as shown by arrow B in the figure; the cooling tower Ⅱ 5, the refrigeration main unit 6, and the water-water heat exchanger 7 do not start to operate.

[0046] Figure 3 This is a schematic structural diagram of the heat pipe multi-connected energy-saving heat rejection system applicable to a server room of the present invention when only the cooling tower Ⅰ and the cooling tower Ⅱ are started to utilize the pure natural cold source. As Figure 3 shown, when the natural cold source is sufficient and only starting the cooling tower Ⅰ 4 and the cooling tower Ⅱ 5 to utilize the pure natural cold source can meet the operation requirements of the system, the first refrigerant circulation heat exchange loop in which the hot sides of multiple refrigerant coil heat exchangers Ⅰ 1-2 and the water-refrigerant intermediate heat exchanger Ⅰ 2 are connected through pipelines starts to operate. At this time, the refrigerant flow direction in the loop is as shown by arrow A in the figure; the cold side of the water-refrigerant intermediate heat exchanger Ⅰ 2 and the cooling tower Ⅰ 4 are connected through pipelines to start the operation of the first chilled water circulation heat exchange loop. At this time, the chilled water flow direction in the loop is as shown by arrow B in the figure; the second chilled water circulation heat exchange loop only utilizes the natural cold source. Close the control valve Ⅰ 7-1 and the control valve Ⅱ 7-2, and open the control valve Ⅲ 6-1 and the control valve Ⅳ 6-2, so as to correspondingly close the bypass pipeline Ⅰ and the bypass pipeline Ⅱ, and open the bypass pipeline Ⅲ and the bypass pipeline Ⅳ, so that the cold side of the water-refrigerant intermediate heat exchanger Ⅱ 3 bypasses the chilled water flow side of the refrigeration main unit 6 and only forms a chilled water circulation with the hot side of the water-water heat exchanger 7, and makes the cold side of the water-water heat exchanger 7 bypass the cooling water flow side of the refrigeration main unit 6 and only form a cooling water circulation with the cooling tower Ⅱ 5. At this time, the cooling tower Ⅱ 5, the cold side of the water-water heat exchanger 7, and the cooling water circulation heat exchange loop connected by pipelines between the two start to operate. At this time, the cooling water flow direction in the loop is as shown by arrow E in the figure; it can provide chilled water cooled by the natural cold source for the cold side of the water-refrigerant intermediate heat exchanger Ⅱ 3, the hot side of the water-water heat exchanger 7, and the second chilled water circulation heat exchange loop connected by pipelines between the two. At this time, the chilled water flow direction in the second chilled water circulation heat exchange loop is as shown by arrow D in the figure; the second refrigerant circulation heat exchange loop using the natural cold source in which the hot sides of multiple refrigerant coil heat exchangers Ⅱ 1-3 and the water-refrigerant intermediate heat exchanger Ⅱ 3 are connected through pipelines starts to operate, and can exchange heat with the chilled water on the cold side of the water-refrigerant intermediate heat exchanger Ⅱ 3, so as to condense the refrigerant vapor that absorbs the server heat in each refrigerant coil heat exchanger Ⅱ 1-3 in the second refrigerant circulation heat exchange loop into refrigerant liquid. At this time, the refrigerant flow direction in the second refrigerant circulation heat exchange loop is as shown by arrow C in the figure.

[0047] Figure 4 This is a schematic structural diagram of the heat pipe multi-connected energy-saving heat rejection system applicable to server rooms of the present utility model when starting cooling tower Ⅰ, cooling tower Ⅱ, and refrigeration host to utilize natural cold source and mechanical refrigeration simultaneously. As Figure 4 shown, when the natural cold source can be utilized but is insufficient, while starting cooling tower Ⅰ 4 and cooling tower Ⅱ 5 to utilize the natural cold source, the refrigeration host 6 is also started for refrigeration supplement to meet the system operation requirements. At this time, the first refrigerant circulation heat exchange loop in which the hot sides of multiple refrigerant coil heat exchangers Ⅰ 1-2 and the water-refrigerant intermediate heat exchanger Ⅰ 2 are connected through pipelines starts to operate, and the refrigerant flow direction in the loop is as shown by arrow A in the figure; the first chilled water circulation heat exchange loop in which the cold side of the water-refrigerant intermediate heat exchanger Ⅰ 2 and cooling tower Ⅰ 4 are connected through pipelines starts to operate, and the chilled water flow direction in the loop is as shown by arrow B in the figure; the second chilled water circulation heat exchange loop utilizes natural cold source and mechanical refrigeration simultaneously. The control valve Ⅰ 7-1, control valve Ⅱ 7-2, control valve Ⅲ 6-1, and control valve Ⅳ 6-2 are closed to correspondingly close bypass pipeline Ⅰ, bypass pipeline Ⅱ, bypass pipeline Ⅲ, and bypass pipeline Ⅳ, so that a chilled water circulation is formed among the cold side of the water-refrigerant intermediate heat exchanger Ⅱ 3, the hot side of the water-water heat exchanger 7, and the chilled water flow side of the refrigeration host 6, and a cooling water circulation is formed among the cold side of the water-water heat exchanger 7, the cooling water flow side of the refrigeration host 6, and cooling tower Ⅱ 5. At this time, the cooling water circulation heat exchange loop in which cooling tower Ⅱ 5, the cold side of the water-water heat exchanger 7, and the cooling water flow side of the refrigeration host 6 are connected through pipelines starts to operate, and the cooling water flow direction in the loop is as shown by arrow G in the figure; it can provide chilled water that combines natural cold source and mechanical refrigeration for the second chilled water circulation heat exchange loop in which the cold side of the water-refrigerant intermediate heat exchanger Ⅱ 3, the hot side of the water-water heat exchanger 7, and the chilled water flow side of the refrigeration host 6 are connected through pipelines. First, it uses the natural cold source for precooling, and then uses the refrigeration host 6 to produce chilled water that meets the temperature requirements through mechanical refrigeration. At this time, the chilled water flow direction in the second chilled water circulation heat exchange loop is as shown by arrow F in the figure; the second refrigerant circulation heat exchange loop that utilizes natural cold source and mechanical refrigeration in which the hot sides of multiple refrigerant coil heat exchangers Ⅱ 1-3 and the water-refrigerant intermediate heat exchanger Ⅱ 3 are connected through pipelines starts to operate, and can exchange heat with the chilled water on the cold side of the water-refrigerant intermediate heat exchanger Ⅱ 3, so as to condense the refrigerant vapor that absorbs the server heat in the refrigerant coil heat exchanger Ⅱ 1-3 in the second refrigerant circulation heat exchange loop into refrigerant liquid. At this time, the refrigerant flow direction in the second refrigerant circulation heat exchange loop is as shown by arrow C in the figure.

[0048] Figure 5 This is a schematic structural diagram of the heat pipe multi-connected energy-saving heat rejection system applicable to server rooms of the present utility model when only starting the refrigeration host and using mechanical refrigeration. As Figure 5As shown, when the natural cold source does not meet the usage conditions, only the refrigeration host 6 is started for refrigeration to meet the operation requirements of the system. At this time, the chilled water circulation heat exchange circuit only utilizes mechanical refrigeration. Control valve I 7-1 and control valve II 7-2 are opened, and control valve III 6-1 and control valve IV 6-2 are closed, so as to correspondingly open bypass pipeline I and bypass pipeline II, and close bypass pipeline III and bypass pipeline IV, so that the cold side of the water-refrigerant intermediate heat exchanger II 3 bypasses the hot side of the water-water heat exchanger 7 and only forms a chilled water circulation between the chilled water flow side of the refrigeration host 6, and the cooling water bypasses the cold side of the water-water heat exchanger 7, and only the cooling water flow side of the refrigeration host 6 and the cooling tower II 5 form a cooling water circulation; at this time, the cooling tower II 5, the cooling water flow side of the refrigeration host 6 and the cooling water circulation heat exchange circuit connected by pipelines between the two start to operate. At this time, the flow direction of the cooling water in the circuit is as shown by arrow J in the figure; at this time, the cold side of the water-refrigerant intermediate heat exchanger II 3 and the chilled water flow side of the refrigeration host 6 provide chilled water that only utilizes mechanical refrigeration through the second chilled water circulation heat exchange circuit connected by pipelines. At this time, the flow direction of the chilled water in the second chilled water circulation heat exchange circuit is as shown by arrow H in the figure; at this time, the second refrigerant circulation heat exchange circuit that utilizes mechanical refrigeration and is connected by pipelines between multiple refrigerant coil heat exchangers II 1-3 and the hot side of the water-refrigerant intermediate heat exchanger II 3 starts to operate, and can exchange heat with the chilled water on the cold side of the water-refrigerant intermediate heat exchanger II 3, so as to condense the refrigerant vapor that absorbs the heat of the server by the refrigerant coil heat exchanger II 1-3 in the second refrigerant circulation heat exchange circuit into a refrigerant liquid. At this time, the flow direction of the refrigerant in the second refrigerant circulation heat exchange circuit is as shown by arrow C in the figure.

[0049] 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 principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A heat pipe multi-connected energy-saving heat rejection system applicable to a server computer room, comprising multiple double-coil indoor heat rejection units placed in the computer room, at least one water-refrigerant intermediate heat exchanger I and one water-refrigerant intermediate heat exchanger II placed in the air-conditioning room, and at least one cooling tower I, one cooling tower II, one refrigeration main unit, and one water-water heat exchanger placed outside the computer room, characterized in that: Each of the double-coil indoor heat rejection units at least includes a refrigerant coil heat exchanger I and a refrigerant coil heat exchanger II, wherein: Each of the refrigerant coil heat exchangers I is connected to the hot side of the water-refrigerant intermediate heat exchanger I through a pipeline to form a first refrigerant circulation heat exchange loop using natural cold source, and the cold side of the water-refrigerant intermediate heat exchanger I is connected to the cooling tower I through a pipeline to form a first chilled water circulation heat exchange loop; Each of the refrigerant coil heat exchangers II is connected to the hot side of the water-refrigerant intermediate heat exchanger II through a pipeline to form a second refrigerant circulation heat exchange loop that combines natural cold source and mechanical refrigeration, and the cold side of the water-refrigerant intermediate heat exchanger II, the hot side of the water-water heat exchanger, and the chilled water flow side of the refrigeration main unit are sequentially connected through a pipeline to form a second chilled water circulation heat exchange loop that combines natural cold source and mechanical refrigeration, and the cooling tower II, the cold side of the water-water heat exchanger, and the cooling water flow side of the refrigeration main unit are sequentially connected through a pipeline to form a cooling water circulation heat exchange loop; And among them, A bypass pipeline I with a control valve I is provided between the chilled water inlet and the chilled water outlet on the hot side of the water-water heat exchanger, and a bypass pipeline II with a control valve II is provided between the cooling water inlet and the cooling water outlet on the cold side; A bypass pipeline III with a control valve III is provided between the inlet and the outlet of the chilled water flow side of the refrigeration main unit, and a bypass pipeline IV with a control valve IV is provided between the inlet and the outlet of the cooling water flow side.

2. The heat pipe multi-connected energy-saving heat removal system suitable for a server room according to claim 1 is characterized in that: Each of the double-coil indoor heat rejection units further includes a sheet metal frame and multiple indoor fans. The refrigerant coil heat exchanger I, the refrigerant coil heat exchanger II, and each indoor fan are all arranged in the sheet metal frame. Among them, the refrigerant coil heat exchanger I is arranged adjacent to the heat source, the refrigerant coil heat exchanger II is arranged downstream of the air path of the refrigerant coil heat exchanger I, and the indoor fans are arranged adjacent to the air outlet side of the refrigerant coil heat exchanger II.

3. The heat pipe multi-connected energy-saving heat removal system suitable for a server room according to claim 1 is characterized in that: The layout position of the bottom of the water-refrigerant intermediate heat exchanger I is higher than the layout position of the top of the refrigerant coil heat exchanger I, so that the first refrigerant circulation heat exchange loop is driven by gravity.

4. The heat pipe multi-connected energy-saving heat rejection system applicable to a server room according to claim 1, wherein, The layout position of the bottom of the water-refrigerant intermediate heat exchanger II is higher than the layout position of the top of the refrigerant coil heat exchanger II, so that the second refrigerant circulation heat exchange loop is driven by gravity.

5. The heat pipe multi-connected energy-saving heat removal system suitable for a server room according to claim 1, characterized in that: A water pump I is installed on the first chilled water circulation heat exchange loop, a water pump II is installed on the second chilled water circulation heat exchange loop, and a water pump III is installed on the cooling water circulation heat exchange loop.

6. The heat pipe multi-connected energy-saving heat rejection system applicable to a server room according to claim 1, characterized in that, The double-coil indoor heat exhaust unit is installed in the air-conditioned room for a computer room air conditioner, or installed between rows of cabinets for a row-level air conditioner, or installed above or below a closed passage, or installed in the form of an air wall on the exhaust side of rows of cabinets; the double-coil indoor heat exhaust unit has a return air inlet and a supply air outlet, and an air filter is optionally installed at the return air inlet of the double-coil indoor heat exhaust unit according to the usage place.

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