Double-cold-source multi-connected energy-saving air conditioning system

Abstract

The utility model provides a double-cold-source multi-connected energy-saving air conditioning system which comprises a plurality of water-water double-coil energy-saving air conditioners, a cooling tower I, a cooling tower II, a refrigeration main machine, a water-water heat exchanger and the like, and a water coil heat exchanger I and a water coil heat exchanger II are arranged in each water-water double-coil energy-saving air conditioner. The water coil heat exchanger I and the cooling tower I form a first water circulation heat exchange loop utilizing a natural cold source, and the water coil heat exchanger II, the water-water heat exchanger and the refrigeration main machine form a second water circulation heat exchange loop with one or combination of the natural cold source and mechanical refrigeration. The cooling tower II, the water-water heat exchanger and the refrigeration main machine form a third water circulation heat exchange loop; the system adopts a double-cold-source multi-connection mode, a natural cold source is fully utilized for cooling, and then chilled water is prepared by mechanical refrigeration, so that the system is guaranteed to run in an energy-saving manner all year round. The double-cold-source multi-connected energy-saving air conditioning system is particularly suitable for a high-density server room, and an efficient, energy-saving and reliable heat dissipation solution is provided for the high-density server room.

Description

Technical Field

[0001] The utility model belongs to the field of heat rejection in computer rooms with high heat dissipation density, and relates to a water-water double-coil energy-saving air conditioning system, in particular to a dual-cooling-source multi-connected energy-saving air conditioning system. Background Technique

[0002] With the rapid development of information technology, the integration density of cabinet servers in computer rooms is getting higher and higher, and the heat generated by servers is also increasing. These high-density server computer rooms usually have a large amount of heat generation. If the heat cannot be removed in a timely and efficient manner, it will have a serious impact on the operation stability and service life of the equipment, and may even lead to system failures and equipment damage. In order to ensure that the servers in the computer room with high heat dissipation density operate normally at the most suitable ambient temperature, the current heat rejection methods in high heat dissipation density computer rooms are also constantly evolving to pursue higher energy efficiency and better heat dissipation effects, and continuously pursue energy-saving and high efficiency. There are several main heat rejection methods on the market at present, but there are still many deficiencies in dealing with different seasons and load changes.

[0003] In the prior art, the air conditioning terminal with a single-coil heat exchanger operates in a mode that uses the natural cold source for cooling through a cooling tower in the low-temperature season, and uses the mechanical refrigeration method of a chiller in the case of high temperature or insufficient natural cold source. Although this operation mode utilizes the natural cold source to a certain extent, the mixed refrigeration mode cannot be used in the transitional season, and there is still some room for energy saving. In addition, the performance of the single-coil heat exchanger system is not ideal under high load and extreme environments, and it is difficult to meet the requirements of modern computer rooms for efficient and stable heat dissipation.

[0004] In order to solve the limitations of the single-coil heat exchanger system, there is also a water-fluorine double-coil heat exchanger used in the market at present. One of the fluorine coil heat exchangers uses the natural cold source chilled water of the cooling tower through an intermediate heat exchanger, and the other water coil heat exchanger directly uses the mechanical refrigeration of the chiller. This method relatively fully utilizes the natural cold source and provides additional cooling capacity through mechanical refrigeration when necessary, and the energy-saving effect is obvious. However, this system still has some limitations. For example, under different seasons and different load conditions, the cooperative working efficiency of the two cold sources is not ideal. Due to the different working mechanisms of the natural cold source and mechanical refrigeration, there are often delays and inconsistencies in the process of switching and cooperative working, resulting in the overall energy efficiency not reaching the optimal state. Secondly, although the existing double-coil system has made progress in energy saving, its adaptability is poor. The traditional double-coil heat exchange system has a relatively slow adjustment response speed and cannot quickly adjust the cooling mode according to the real-time load change, which easily leads to large temperature fluctuations in the computer room.

[0005] In summary, although the existing computer room air conditioning systems have made certain progress in heat dissipation and energy conservation, there are still problems such as poor energy conservation effect, poor adaptability, and complex structure. How to develop an energy-saving air conditioning system that can make more full use of natural cold sources and mechanical refrigeration and can flexibly adjust according to environmental and load changes to further improve the heat dissipation efficiency of the computer room and significantly reduce energy consumption is a technical problem that needs to be solved urgently at present. Summary of the Invention

[0006] Aiming at the disadvantages and deficiencies of the existing technology and to solve at least one of the above and other technical problems in the existing technology, the present invention aims to provide a dual-cooling-source multi-connected energy-saving air conditioning system. The system adopts a dual-cooling-source multi-connected method, makes full use of natural cold sources for cooling, and secondly uses mechanical refrigeration to produce chilled water to ensure the annual energy-saving operation of the system. The dual-cooling-source multi-connected energy-saving air conditioning system of the present invention is especially suitable for high-density server computer rooms and provides an efficient, energy-saving, and reliable heat dissipation solution for them.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0008] A dual-cooling-source multi-connected energy-saving air conditioning system includes multiple water-water double-coil energy-saving air conditioners, a cooling tower I, a cooling tower II, a refrigeration host, and a water-water heat exchanger. Specifically:

[0009] The multiple water-water double-coil energy-saving air conditioners are arranged in the computer room. Each water-water double-coil energy-saving air conditioner at least includes a sheet metal frame and a water coil heat exchanger I, a water coil heat exchanger II, and an indoor fan arranged in the sheet metal frame. Among them:

[0010] The water coil heat exchanger I is arranged adjacent to the heat source side and at least includes a water inlet and a water outlet. The water coil heat exchanger II is arranged downstream of the air path of the water coil heat exchanger I and at least includes a water inlet and a water outlet. The indoor fan is arranged adjacent to the air outlet side of the water coil heat exchanger II;

[0011] The cooling tower I at least includes a water inlet and a water outlet;

[0012] The cooling tower II at least includes a water inlet and a water outlet;

[0013] The refrigeration host at least includes a chilled water inlet, a chilled water outlet, a cooling water inlet, and a cooling water outlet. A bypass pipeline I with a control valve I is provided between the chilled water inlet and the chilled water outlet, and a bypass pipeline II with a control valve II is provided between the cooling water inlet and the cooling water outlet;

[0014] The water-water heat exchanger at least includes a chilled water inlet, a chilled water outlet, a cooling water inlet, and a cooling water outlet. A bypass line III with a control valve III is provided between the chilled water inlet and the chilled water outlet, and a bypass line IV with a control valve IV is provided between the cooling water inlet and the cooling water outlet.

[0015] The water coil heat exchanger I in each of the water-water double-coil energy-saving air conditioners is correspondingly connected and communicated with the water outlet and the water inlet of the cooling tower I through its water inlet, water outlet and by means of a connecting pipeline, thereby forming a first water circulation heat exchange loop using natural cold source.

[0016] The water inlet of the water coil heat exchanger II in each of the water-water double-coil energy-saving air conditioners is connected and communicated with the chilled water outlet of the refrigeration host and the bypass line I through a connecting pipeline, and the water outlet is connected and communicated with the chilled water inlet of the water-water heat exchanger and the bypass line III through a connecting pipeline. The chilled water outlet of the water-water heat exchanger and the bypass line III are connected and communicated with the chilled water inlet of the refrigeration host and the bypass line I through a connecting pipeline, thereby forming a second water circulation heat exchange loop for alternatively or jointly using natural cold source and mechanical refrigeration.

[0017] The water inlet of the cooling tower II is connected and communicated with the cooling water outlet of the refrigeration host and the bypass line II through a connecting pipeline, and the water outlet is connected and communicated with the cooling water inlet of the water-water heat exchanger and the bypass line IV through a connecting pipeline. The cooling water outlet of the water-water heat exchanger and the bypass line IV are connected and communicated with the cooling water inlet of the refrigeration host and the bypass line II through a connecting pipeline, thereby forming a third water circulation heat exchange loop.

[0018] Preferably, a water pump I is installed on the connecting pipeline between the cooling tower I and each water coil heat exchanger I, a water pump II is installed on the connecting pipeline between the water coil heat exchanger II, the water-water heat exchanger and the refrigeration host in each of the water-water double-coil energy-saving air conditioners, and a water pump III is installed on the connecting pipeline between the cooling tower II, the water-water heat exchanger and the refrigeration host.

[0019] Preferably, when the second water circulation heat exchange loop only uses natural cold source for cooling, the refrigeration host is turned off and the control valve I and the control valve II are opened to correspondingly open the bypass line I and the bypass line II, and the control valve III and the control valve IV are closed to correspondingly close the bypass line III and the bypass line IV. A chilled water circulation loop is formed between the water coil heat exchanger II and the hot side of the water-water heat exchanger in each of the water-water double-coil energy-saving air conditioners, and a cooling water circulation loop is formed between the cold side of the water-water heat exchanger and the cooling tower II, so that the chilled water bypasses the refrigeration host and is only cooled by the water-water heat exchanger, thereby ensuring that the system only relies on natural cold source for cooling.

[0020] Further, when the natural cold source fully meets the system operation requirements, the system operates the first water circulation heat exchange circuit and the second water circulation heat exchange circuit that only uses the natural cold source for cooling. At this time, the first water circulation heat exchange circuit formed by multiple water coil heat exchangers I and the cooling tower I starts to operate, the chilled water circulation circuit formed by multiple water coil heat exchangers II and the hot side of the water-water heat exchanger starts to operate, the cooling water circulation circuit formed by the cooling tower II and the cold side of the water-water heat exchanger starts to operate, and the refrigeration host does not start to operate.

[0021] Preferably, when the second water circulation heat exchange circuit uses both the natural cold source and mechanical refrigeration, the refrigeration host is turned on, and the control valves I, II, III, and IV are closed to correspondingly close the bypass pipelines I, II, III, and IV. In each water-water double-coil energy-saving air conditioner, a chilled water circulation circuit is formed between the water coil heat exchanger II and the hot side of the water-water heat exchanger and the chilled water side of the refrigeration host. A cooling water circulation circuit is formed between the cold side of the water-water heat exchanger, the cooling water side of the refrigeration host, and the cooling tower II, so that the chilled water is pre-cooled by the water-water heat exchanger first and then further cooled by the refrigeration host, so that the natural cold source and mechanical refrigeration of the system operate together to ensure that the computer room temperature can be maintained within a reasonable range under high load or insufficient natural cold source conditions, and the balance between cooling efficiency and energy consumption is achieved.

[0022] Further, when the natural cold source only partially meets the system operation requirements, the system operates the first water circulation heat exchange circuit and the second water circulation heat exchange circuit that combines the natural cold source and mechanical refrigeration. At this time, the first water circulation heat exchange circuit formed by multiple water coil heat exchangers I and the cooling tower I starts to operate, the chilled water circulation circuit formed by multiple water coil heat exchangers II and the water-water heat exchanger and the refrigeration host starts to operate, and the cooling water circulation circuit formed by the cooling tower II, the water-water heat exchanger, and the refrigeration host starts to operate.

[0023] Preferably, when the second water circulation heat exchange circuit only uses mechanical refrigeration, the refrigeration host is turned on, and the control valves I and II are closed to correspondingly close the bypass pipelines I and II. The control valves III and IV are opened to correspondingly open the bypass pipelines III and IV. In each water-water double-coil energy-saving air conditioner, a chilled water circulation circuit is formed between the water coil heat exchanger II and the chilled water side of the refrigeration host. A cooling water circulation circuit is formed between the cooling water side of the refrigeration host and the cooling tower II, so that the chilled water bypasses the hot side of the water-water heat exchanger and is only cooled by the refrigeration host, so as to ensure that the system only relies on mechanical refrigeration for cooling, and to ensure that the system relies on mechanical refrigeration when the natural cold source is unavailable, continuously providing sufficient cooling capacity to maintain an efficient and stable heat dissipation effect.

[0024] Further, when the natural cold source cannot meet the operation requirements of the system, the system shuts down the operation of the first water circulation heat exchange loop and only operates the second water circulation heat exchange loop that utilizes mechanical refrigeration. At this time, the chilled water circulation loop formed by the plurality of water coil heat exchangers II and the refrigeration host starts to operate, and the cooling water circulation loop formed by the cooling tower II and the refrigeration host starts to operate.

[0025] Preferably, the water-water dual-coil energy-saving air conditioner can be an in-row air conditioner installed in an air-conditioned room, or a row-level air conditioner installed between in-line cabinets or above or below a closed passage, or can be installed in the form of a wind wall on the exhaust side of in-line cabinets.

[0026] Further, the water-water dual-coil energy-saving air conditioner is provided with an air return opening and an air supply opening. According to the use place, an air filter can be optionally installed at the air return opening of the water-water dual-coil energy-saving air conditioner to effectively filter dust and particulate matter in the air entering the water-water dual-coil energy-saving air conditioner.

[0027] Further, the system further includes a group control box and various temperature and humidity sensors, pressure sensors, water leakage sensors, etc. The group control box is communicatively connected to the water-water dual-coil energy-saving air conditioner, cooling tower I, cooling tower II, refrigeration host, water-water heat exchanger, control valve I, control valve II, control valve III, control valve IV, and various temperature and humidity sensors, pressure sensors, water leakage sensors, etc., so as to regulate the energy-saving and safe operation of the entire system.

[0028] Compared with the prior art, the dual cold source multi-connected energy-saving air conditioner system provided by the present invention has the following beneficial and remarkable technical effects:

[0029] (1) One of the water coil heat exchangers in the water-water dual-coil energy-saving air conditioner of the present invention and the natural cold source cooling tower form a chilled water system that can utilize the natural cold source. The other water coil heat exchanger first utilizes the natural cold source and then utilizes mechanical refrigeration. The system adopts a dual cold source multi-connected mode, significantly reducing energy consumption and operation costs, and ensuring the efficient operation of the system in all seasons of the year.

[0030] (2) Through the dual cold source design that combines the natural cold source and mechanical refrigeration, the present invention realizes a significant improvement in energy saving and efficient cooling. When the natural cold source is sufficient, the system preferentially utilizes the natural cold source for cooling, thereby reducing the usage frequency of mechanical refrigeration, reducing energy consumption and operation costs. At the same time, the system has a flexible switching ability and can automatically adjust the refrigeration mode according to changes in external environmental conditions and fluctuations in the computer room load, so as to ensure the efficient energy-saving operation of the system throughout the year in different seasons.

[0031] (3) The double-coil heat exchanger design and triple water circulation loop adopted by the present utility model significantly improve the heat exchange efficiency. By introducing the design of bypass pipelines and control valves, the system can adjust the water flow path and flow rate in real time according to the load demand and environmental conditions, minimizing energy consumption to the greatest extent. This dynamic adjustment ability significantly improves the adaptability and stability of the system, ensuring optimal performance under various conditions.

[0032] (4) The dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model is particularly suitable for high-density server computer rooms, demonstrating significant technical advantages in terms of energy efficiency, flexibility, reliability, and adaptability. It can ensure the long-term stable operation of servers under high-load conditions, reduce the risk of equipment failure, extend the service life, and has important practical value and broad application prospects. Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model.

[0034] Figure 2 It is an operating schematic diagram of the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model when only natural cooling source is utilized.

[0035] Figure 3 It is an operating schematic diagram of the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model when natural cooling source is preferentially utilized and mechanical refrigeration is used as a supplement.

[0036] Figure 4 It is an operating schematic diagram of the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model when only mechanical refrigeration is used.

[0037] Description of the Reference Numerals:

[0038] Water-water double-coil energy-saving air conditioner 1, sheet metal frame 1-1, water coil heat exchanger I 1-2, water coil heat exchanger II 1-3, indoor fan 1-4, air filter 1-5, cooling tower I 2, cooling tower II 3, refrigeration host 4, control valve I 4-1, control valve II 4-2, water-water heat exchanger 5, control valve III 5-1, control valve IV 5-2, connecting pipeline assembly I 6, connecting pipeline assembly II 7, connecting pipeline assembly III 8, water pump I 9, water pump II 10, water pump III 11, group control box 12. Detailed Description of the Embodiment

[0039] To make the objectives, technical solutions, and advantages of the present utility model more clear and understandable, the following examples are given with reference to the accompanying drawings to further elaborate on the present utility model in detail. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0040] Example 1

[0041] As a specific example, Figure 1 This is a schematic structural diagram of the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model. As shown in the figure, the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model includes multiple water-water double-coil energy-saving air conditioners 1, cooling tower Ⅰ 2, cooling tower Ⅱ 3, refrigeration host 4, and water-water heat exchanger 5. Among them, multiple water-water double-coil energy-saving air conditioners 1 are arranged in the machine room, including a sheet metal frame 1-1 and a water coil heat exchanger Ⅰ 1-2, a water coil heat exchanger Ⅱ 1-3, and an indoor fan 1-4 arranged inside the sheet metal frame 1-1. The water coil heat exchanger Ⅰ 1-2 is arranged adjacent to the heat source side and at least includes a water inlet and a water outlet. The water coil heat exchanger Ⅱ 1-3 is arranged downstream of the air path of the water coil heat exchanger Ⅰ 1-2 and at least includes a water inlet and a water outlet. The indoor fan 1-4 is arranged adjacent to the air outlet side of the water coil heat exchanger Ⅱ 1-3.

[0042] Cooling tower Ⅰ 2 at least includes a water inlet and a water outlet; cooling tower Ⅱ 3 at least includes a water inlet and a water outlet; refrigeration host 4 at least includes a chilled water inlet, a chilled water outlet, a cooling water inlet, and a cooling water outlet, and a bypass pipeline Ⅰ 4-1 with a control valve Ⅰ is provided between its chilled water inlet and chilled water outlet, and a bypass pipeline Ⅱ 4-2 with a control valve Ⅱ is provided between its cooling water inlet and cooling water outlet; water-water heat exchanger 5 at least includes a chilled water inlet, a chilled water outlet, a cooling water inlet, and a cooling water outlet, a bypass pipeline Ⅲ 5-1 with a control valve Ⅲ is provided between its chilled water inlet and chilled water outlet, and a bypass pipeline Ⅳ 5-2 with a control valve Ⅳ is provided between its cooling water inlet and cooling water outlet.

[0043] Multiple water coil heat exchangers Ⅰ 1-2 and cooling tower Ⅰ 2 form a first water circulation heat exchange loop using natural cold source through a connection pipeline assembly Ⅰ 6; multiple water coil heat exchangers Ⅱ 1-3 and water-water heat exchanger 5, refrigeration host 4 form a second water circulation heat exchange loop where natural cold source and mechanical refrigeration are alternative or combined through a connection pipeline assembly Ⅱ 7; cooling tower Ⅱ 3, water-water heat exchanger 5, refrigeration host 4 form a third water circulation heat exchange loop through a connection pipeline assembly Ⅲ 8.

[0044] In some preferred examples, a water pump Ⅰ 9 is installed on the connection pipeline assembly Ⅰ 6, a water pump Ⅱ 10 is installed on the connection pipeline assembly Ⅱ 7, and a water pump Ⅲ 11 is installed on the connection pipeline assembly Ⅲ 8. The setting of these water pumps can ensure sufficient water flow power in each water circulation loop and effectively improve the heat exchange efficiency of the system.

[0045] In some preferred examples, the water-water double-coil energy-saving air conditioner 1 can be installed as a computer room air conditioner in an air-conditioned room, or as a row-level air conditioner between rows of cabinets or above or below a closed passage, or can be installed in the form of a wind wall on the exhaust side of rows of cabinets; the water-water double-coil energy-saving air conditioner 1 has a return air outlet and a supply air outlet. According to the usage place, an air filter 1-5 can be optionally installed at the return air outlet of the water-water double-coil energy-saving air conditioner 1 to effectively filter dust and particulate matter in the air entering the water-water double-coil energy-saving air conditioner 1.

[0046] In some preferred examples, the system can also include a group control box 12 and various temperature and humidity sensors, pressure sensors, water leakage sensors, etc. The group control box 12 is communicatively connected to the water-water double-coil energy-saving air conditioner 1, the cooling tower I 2, the cooling tower II 3, the refrigeration host 4, the water-water heat exchanger 5, the control valve I 4-1, the control valve II 4-2, the control valve III 5-1, the control valve IV 5-2 and various temperature and humidity sensors, pressure sensors, water leakage sensors, etc., so as to regulate the energy-saving and safe operation of the entire system.

[0047] Embodiment 2

[0048] Figure 2 It is a schematic structural diagram of the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model when only using natural cold source. As shown in the figure, in the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model, when the second water circulation heat exchange loop only uses natural cold source for cooling, the refrigeration host 4 is turned off and the control valve I 4-1 and the control valve II 4-2 are opened to correspondingly open the bypass pipeline I and the bypass pipeline II, and the control valve III 5-1 and the control valve IV 5-2 are closed to correspondingly close the bypass pipeline III and the bypass pipeline IV. A chilled water circulation loop is formed between the water coil heat exchanger II 1-3 in each water-water double-coil energy-saving air conditioner and the hot side of the water-water heat exchanger 5, and a cooling water circulation loop is formed between the cold side of the water-water heat exchanger 5 and the cooling tower II 3, so that the chilled water bypasses the refrigeration host 4 and is only cooled by the water-water heat exchanger 5, thereby ensuring that the system only relies on natural cold source for cooling.

[0049] Correspondingly, the system makes full use of natural cold source for cooling. When the natural cold source fully meets the operation needs of the system, the refrigeration host 4 does not start running. At this time, the system operates the first water circulation heat exchange loop and the second water circulation heat exchange loop using natural cold source for cooling. At this time, the first water circulation heat exchange loop formed by multiple water coil heat exchangers I 1-2, the cooling tower I 2 and the connecting pipeline assembly I 6 starts to operate, and the chilled water flows as shown by the arrow A in the figure; multiple water coil heat exchangers II 1-3, the water-water heat exchanger 5 and the connecting pipeline assembly II 7 using natural cold source start to operate, and the chilled water flows as shown by the arrow B in the figure; the cooling tower II 3, the water-water heat exchanger 5 and the connecting pipeline assembly III 8 between them start to operate, and the cooling water flows as shown by the arrow C in the figure.

[0050] Embodiment 3

[0051] Figure 3 This is a schematic structural diagram of the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model when preferentially using natural cooling source and then mechanical refrigeration as a supplement. As shown in the figure, in the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model, when the second water circulation heat exchange loop simultaneously uses natural cooling source and mechanical refrigeration, the refrigeration host 4 is turned on, and the control valve I 4-1, control valve II 4-2, control valve III 5-1, and control valve IV 5-2 are closed to correspondingly close the bypass pipeline I, bypass pipeline II, bypass pipeline III, and bypass pipeline IV. A chilled water circulation loop is formed between the water coil heat exchanger II 1-3 in each water-water double-coil energy-saving air conditioner, the hot side of the water-water heat exchanger 5, and the chilled water side of the refrigeration host 4. A cooling water circulation loop is formed between the cold side of the water-water heat exchanger 5, the cooling water side of the refrigeration host 4, and the cooling tower II 3, so that the chilled water is first precooled by the water-water heat exchanger 5 and then further cooled by the refrigeration host 4, so that the natural cooling source and mechanical refrigeration of the system operate together, ensuring that the machine room temperature can be maintained within a reasonable range under high load or insufficient natural cooling source conditions, and achieving the balance of cooling efficiency and energy consumption.

[0052] Correspondingly, when the natural cooling source partially meets the system operation requirements, the system operates the first water circulation heat exchange loop and the second water circulation heat exchange loop that combines the use of natural cooling source and mechanical refrigeration. At this time, the first water circulation heat exchange loop formed by multiple water coil heat exchangers I 1-2, the cooling tower I 2, and the connecting pipeline assembly I 6 starts to operate, and the chilled water flows as shown by the arrow A in the figure; multiple water coil heat exchangers II 1-3, the water-water heat exchanger 5, the refrigeration host 4, and the connecting pipeline assembly II 7 that combines the connected natural cooling source and mechanical refrigeration start to operate, and the chilled water flows as shown by the arrow D in the figure; the cooling tower II 3, the water-water heat exchanger 5, the refrigeration host 4, and the connecting pipeline assembly III 8 that are connected start to operate, and the cooling water flows as shown by the arrow E in the figure.

[0053] Embodiment 4

[0054] Figure 4It is a structural schematic diagram of the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model when only mechanical refrigeration is used. As shown in the figure, in the dual-cooling-source multi-connected energy-saving air-conditioning system of the present utility model, when the second water circulation heat exchange loop only utilizes mechanical refrigeration, the refrigeration host 4 is turned on, and the control valve I 4-1 and the control valve II 4-2 are closed to correspondingly close the bypass pipeline I and the bypass pipeline II, and the control valve III 5-1 and the control valve IV 5-2 are turned on to correspondingly open the bypass pipeline III and the bypass pipeline IV. A chilled water circulation loop is formed between the water coil heat exchanger II 1-3 in each water-water double-coil energy-saving air conditioner and the chilled water side of the refrigeration host 4, and a cooling water circulation loop is formed between the cooling water side of the refrigeration host 4 and the cooling tower II 3, so that the chilled water bypasses the hot side of the water-water heat exchanger 5 and is only cooled by the refrigeration host 4, thereby ensuring that the system relies only on mechanical refrigeration for cooling, ensuring that the system relies on mechanical refrigeration when the natural cold source is unavailable, and continuously providing sufficient cooling capacity to maintain an efficient and stable heat dissipation effect.

[0055] Correspondingly, when the natural cold source cannot meet the operation requirements of the system, the system operates the second water circulation heat exchange loop using mechanical refrigeration. At this time, multiple water coil heat exchangers II 1-3, the refrigeration host 4, and the connected connection pipeline assembly II 7 using mechanical refrigeration are started. The flow of chilled water is as shown by the arrow F in the figure; the cooling tower II 3, the refrigeration host 4, and the connected connection pipeline assembly III 8 therebetween are started. The flow of cooling water is as shown by the arrow G in the figure.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A dual-cooling-source multi-connected energy-saving air-conditioning system, at least comprising a plurality of water-water double-coil energy-saving air conditioners, a cooling tower I, a cooling tower II, a refrigeration host, and a water-water heat exchanger, and is characterized in that: The plurality of water-water double-coil energy-saving air conditioners are arranged in a machine room. Each water-water double-coil energy-saving air conditioner at least comprises a sheet metal frame and a water coil heat exchanger I, a water coil heat exchanger II, and an indoor fan arranged in the sheet metal frame, wherein: The water coil heat exchanger I is arranged adjacent to the heat source side and at least comprises a water inlet and a water outlet. The water coil heat exchanger II is arranged downstream of the air path of the water coil heat exchanger I and at least comprises a water inlet and a water outlet. The indoor fan is arranged adjacent to the air outlet side of the water coil heat exchanger II; The cooling tower I at least comprises a water inlet and a water outlet; The cooling tower II at least comprises a water inlet and a water outlet; The refrigeration host at least comprises a chilled water inlet, a chilled water outlet, a cooling water inlet, and a cooling water outlet, and a bypass pipeline I with a control valve I is arranged between its chilled water inlet and chilled water outlet, and a bypass pipeline II with a control valve II is arranged between its cooling water inlet and cooling water outlet; The water-water heat exchanger at least comprises a chilled water inlet, a chilled water outlet, a cooling water inlet, and a cooling water outlet, and a bypass pipeline III with a control valve III is arranged between its chilled water inlet and chilled water outlet, and a bypass pipeline IV with a control valve IV is arranged between its cooling water inlet and cooling water outlet; The water coil heat exchanger I in each water-water double-coil energy-saving air conditioner is correspondingly communicated with the water outlet and water inlet of the cooling tower I through its water inlet and water outlet and by means of a connecting pipeline, thereby forming a first water circulation heat exchange loop using natural cold source; The water inlet of the water coil heat exchanger II in each water-water double-coil energy-saving air conditioner is communicated with the chilled water outlet of the refrigeration host and the bypass pipeline I through a connecting pipeline, and the water outlet is communicated with the chilled water inlet of the water-water heat exchanger and the bypass pipeline III through a connecting pipeline. The chilled water outlet of the water-water heat exchanger and the bypass pipeline III are communicated with the chilled water inlet of the refrigeration host and the bypass pipeline I through a connecting pipeline, thereby forming a second water circulation heat exchange loop for alternatively or combinedly using natural cold source and mechanical refrigeration; The water inlet of the cooling tower II is communicated with the cooling water outlet of the refrigeration host and the bypass pipeline II through a connecting pipeline, and the water outlet is communicated with the cooling water inlet of the water-water heat exchanger and the bypass pipeline IV through a connecting pipeline. The cooling water outlet of the water-water heat exchanger and the bypass pipeline IV are communicated with the cooling water inlet of the refrigeration host and the bypass pipeline II through a connecting pipeline, thereby forming a third water circulation heat exchange loop.

2. The dual-cooling-source multi-connected energy-saving air-conditioning system according to claim 1, wherein, A water pump I is installed on the connecting pipeline between the cooling tower I and each water coil heat exchanger I. A water pump II is installed on the connecting pipeline between the water coil heat exchanger II, the water-water heat exchanger, and the refrigeration host in each water-water double-coil energy-saving air conditioner. A water pump III is installed on the connecting pipeline between the cooling tower II, the water-water heat exchanger, and the refrigeration host.

3. The dual-cooling-source multi-connected energy-saving air-conditioning system according to claim 1, characterized in that, When the second water circulation heat exchange loop only utilizes natural cold sources for cooling, the refrigeration host is turned off, and control valve I and control valve II are opened to correspondingly open bypass pipeline I and bypass pipeline II, while control valve III and control valve IV are closed to correspondingly close bypass pipeline III and bypass pipeline IV. A chilled water circulation loop is formed between the water coil heat exchanger II in each water-water double-coil energy-saving air conditioner and the hot side of the water-water heat exchanger. A cooling water circulation loop is formed between the cold side of the water-water heat exchanger and cooling tower II, so that the chilled water bypasses the refrigeration host and is only cooled by the water-water heat exchanger.

4. The dual-cooling-source multi-connected energy-saving air-conditioning system according to claim 3, wherein When the natural cold source fully meets the system operation requirements, the system operates the first water circulation heat exchange loop and the second water circulation heat exchange loop that only utilizes natural cold sources for cooling. At this time, the first water circulation heat exchange loop formed by multiple water coil heat exchangers I and cooling tower I starts to operate, the chilled water circulation loop formed by multiple water coil heat exchangers II and the hot side of the water-water heat exchanger starts to operate, the cooling water circulation loop formed by cooling tower II and the cold side of the water-water heat exchanger starts to operate, and the refrigeration host does not start to operate.

5. The dual-cooling-source multi-connected energy-saving air-conditioning system according to claim 1, wherein When the second water circulation heat exchange loop utilizes both natural cold sources and mechanical refrigeration, the refrigeration host is turned on, and control valve I, control valve II, control valve III, and control valve IV are closed to correspondingly close bypass pipeline I, bypass pipeline II, bypass pipeline III, and bypass pipeline IV. A chilled water circulation loop is formed between the water coil heat exchanger II in each water-water double-coil energy-saving air conditioner, the hot side of the water-water heat exchanger, and the chilled water side of the refrigeration host. A cooling water circulation loop is formed between the cold side of the water-water heat exchanger, the cooling water side of the refrigeration host, and cooling tower II, so that the chilled water is first pre-cooled by the water-water heat exchanger and then further cooled by the refrigeration host, thus enabling the natural cold source and mechanical refrigeration of the system to operate together.

6. The dual-cooling-source multi-connected energy-saving air-conditioning system according to claim 5, wherein, When the natural cold source only partially meets the system operation requirements, the system operates the first water circulation heat exchange loop and the second water circulation heat exchange loop that combines natural cold sources and mechanical refrigeration. At this time, the first water circulation heat exchange loop formed by multiple water coil heat exchangers I and cooling tower I starts to operate, the chilled water circulation loop formed by multiple water coil heat exchangers II, the water-water heat exchanger, and the refrigeration host starts to operate, and the cooling water circulation loop formed by cooling tower II, the water-water heat exchanger, and the refrigeration host starts to operate.

7. The dual-cooling-source multi-connected energy-saving air-conditioning system according to claim 1, characterized in that When the second water circulation heat exchange loop only utilizes mechanical refrigeration, the refrigeration host is turned on, and control valve I and control valve II are closed to correspondingly close bypass pipeline I and bypass pipeline II, while control valve III and control valve IV are opened to correspondingly open bypass pipeline III and bypass pipeline IV. A chilled water circulation loop is formed between the water coil heat exchanger II in each water-water double-coil energy-saving air conditioner and the chilled water side of the refrigeration host. A cooling water circulation loop is formed between the cooling water side of the refrigeration host and cooling tower II, so that the chilled water bypasses the hot side of the water-water heat exchanger and is only cooled by the refrigeration host.

8. The dual-cooling-source multi-connected energy-saving air-conditioning system according to claim 7, wherein, When the natural cold source cannot meet the operation requirements of the system, the system shuts down the operation of the first water circulation heat exchange circuit and only operates the second water circulation heat exchange circuit using mechanical refrigeration. At this time, the chilled water circulation circuit formed by multiple water coil heat exchangers II and the chiller starts to operate, and the cooling water circulation circuit formed by the cooling tower II and the chiller starts to operate.

9. The dual-cooling-source multi-connected energy-saving air conditioning system according to claim 1, wherein, The water-water double-coil energy-saving air conditioner is installed as a computer room air conditioner in an air-conditioned room, or as a row-level air conditioner between rows of cabinets, or above or below a closed passage, or installed in the form of a wind wall on the exhaust side of rows of cabinets; the water-water double-coil energy-saving air conditioner has an air return opening and an air supply opening. According to the usage place, an air filter is optionally installed at the air return opening of the water-water double-coil energy-saving air conditioner to effectively filter dust and particulate matter in the air entering the water-water double-coil energy-saving air conditioner.

10. The dual-cooling-source multi-connected energy-saving air-conditioning system according to claim 1, wherein The system also 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-water double-coil energy-saving air conditioner, cooling tower I, cooling tower II, chiller, water-water heat exchanger, control valve I, control valve II, control valve III, control valve IV, 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.

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