Chilled water storage system applied to medium and low temperature cold supply system

Abstract

The utility model relates to a chilled water storage system applied to a medium-low temperature cold supply system. The chilled water storage system structurally comprises a low-temperature refrigeration main machine, a double-working-condition refrigeration main machine, a medium-temperature refrigeration main machine and a chilled water storage device. The system has the advantages that the structural design is reasonable, the system is suitable for a refrigeration station system which is provided with a medium and low temperature cold supply system and uses water for cold storage to reduce the operation cost, the system can be applied to both civil and industrial cold supply fields, and the application scene in the industrial field is wider.

Description

Technical Field

[0001] The utility model relates to a water cooling system, in particular to a water cooling system applied to a medium and low temperature cooling system. Background Art

[0002] Central air-conditioning refrigeration systems have become essential facilities in civil buildings and industrial production, and their operating energy consumption accounts for a relatively high proportion of overall energy consumption. How to effectively reduce the energy consumption of refrigeration systems and improve their efficiency has become a problem that more and more energy-using units are actually facing and urgently need to solve.

[0003] To address these issues, existing technologies have separated low- and medium-temperature cooling systems in scenarios with multiple cooling systems. Using water-cooled storage technology for off-peak electricity utilization has become a viable approach to reducing operating costs for refrigeration and air conditioning systems. While using water-cooled storage technology in combined low- and medium-temperature cooling systems can reduce operating costs, it also presents significant challenges, such as low utilization of the cooling system and low operating efficiency of the cooling unit and refrigeration system under cooling conditions.

[0004] The main reason for the low utilization rate of cold storage systems is that water has a relatively low specific heat capacity. The amount of cold stored per unit volume of liquid water during temperature changes is limited. Cold storage systems only have high cold storage capacity during phase changes or large temperature differences. The temperature difference between the end point of cold storage and the end point of cold release in water-based cold storage systems is small, resulting in low system utilization.

[0005] Under cold storage conditions, the outlet water temperature of the refrigeration unit remains low at the end of the cold storage period, resulting in low operating efficiency. Furthermore, the overall operation of a water-based cold storage system involves a cold storage and then cooling process, during which the water pump consumes far more energy than a direct cooling system. Therefore, the overall efficiency of a water-based cold storage system is relatively low. Utility Model Content

[0006] The utility model provides a water storage cold system for use in a medium and low temperature cooling system, which aims to overcome the above-mentioned deficiencies in the prior art and improve the utilization rate of water storage cold system and the refrigeration efficiency.

[0007] The technical solution of the utility model is as follows: a water storage system applied to a medium and low temperature cooling system, the structure of which includes a low-temperature refrigeration main unit, a dual-mode refrigeration main unit, a medium-temperature refrigeration main unit and a water storage device, wherein the high-temperature water outlet of the water storage device is connected to the medium-temperature return water end through the A pipeline, the middle part of the A pipeline bypasses the B pipeline to connect to the low-temperature return water end, the A pipeline near the medium-temperature return water end bypasses the C pipeline to connect to the low-temperature return water end, the high-temperature water outlet of the water storage device is also connected to the D pipeline with the cold storage water pump of the water storage system, the low-temperature water outlet of the water storage device is connected to the E pipeline, the low-temperature water outlet of the water storage device is also connected to the medium-temperature water supply end through the F pipeline with the cold storage system discharge water pump, the F pipeline between the cold storage system discharge water pump and the medium-temperature water supply end bypasses the G pipeline and is connected to the low-temperature water supply end, G Pipeline bypass H connects to Pipe F near the medium-temperature water supply. The low-temperature refrigeration unit's inlet is connected to Pipe C via Pipe I, which carries the circulating water pump of refrigeration unit C. Pipe D bypasses Pipe I between the circulating water pump of refrigeration unit C and the low-temperature refrigeration unit's inlet. Pipe E bypasses Pipe J, connected to the low-temperature refrigeration unit's outlet, and Pipe H bypasses Pipe J. The dual-mode refrigeration unit's inlet is connected to Pipe C via Pipe K, which carries the circulating water pump of refrigeration unit B. Pipe D bypasses Pipe K between the circulating water pump of refrigeration unit B and the inlet of the dual-mode refrigeration unit. Pipe H bypasses Pipe L, connected to the dual-mode refrigeration unit's outlet, and Pipe E bypasses Pipe L. Pipe C bypasses Pipe M, which carries the circulating water pump of refrigeration unit A, connected to the medium-temperature refrigeration unit's inlet. Pipe H bypasses Pipe N, connected to the medium-temperature refrigeration unit's outlet. The above structure enables switching between various operating modes: cold storage for the low-temperature refrigeration unit, cold storage for the dual-mode refrigeration unit, cold supply from the water storage system to the low-temperature system, and cold supply from the water storage system to the medium-temperature system.

[0008] To achieve specific pipeline switching, preferably, it also includes an A valve-S valve, the A valve is set on the C pipeline between the M pipeline and the K pipeline, the B valve is set on the H pipeline between the N pipeline and the L pipeline, the C valve is set on the C pipeline between the I pipeline and the K pipeline, the D valve is set on the H pipeline between the J pipeline and the L pipeline, the E valve is set on the L pipeline between the E pipeline bypass pipe and the H pipeline, the F valve is set on the bypass pipeline between the E pipeline and the L pipeline, the G valve is set on the bypass pipeline between the D pipeline and the K pipeline, the H valve is set on the J pipeline between the E pipeline bypass pipe and the H pipeline, and the I valve is set on the bypass between the E pipeline and the J pipeline. On the through pipeline, the J valve is arranged on the bypass pipe between the D pipeline and the I pipeline, the K valve is arranged on the F pipeline between the G pipeline and the H pipeline, the L valve is arranged on the A pipeline between the B pipeline and the C pipeline, the M valve is arranged on the G pipeline, the N valve is arranged on the B pipeline, the O valve is arranged on the low-temperature water inlet at the lower part of the cold storage device, the P valve is arranged on the F pipeline on the side of the cold water pump of the water storage system close to the low-temperature water inlet at the lower part of the cold storage device, the Q valve is arranged on the D pipeline on the side of the cold water pump of the water storage system close to the high-temperature water inlet at the upper part of the water storage device, the S valve is arranged on the high-temperature water inlet at the upper part of the water storage device, and the R valve is arranged on the A pipeline between the S valve and the B pipeline.

[0009] The advantages of this utility model are: reasonable structural design, suitable for refrigeration station systems with medium and low temperature cooling systems and using water storage to reduce operating costs, and can be used in both civil and industrial cooling fields, with a wider range of use scenarios in the industrial field.

[0010] 1) The chilled water storage system is applied to both medium and low temperature cooling systems. The chilled water storage system sequentially supplies cooling to the low temperature system and the medium temperature system, thus realizing the cascade utilization of the chilled water storage capacity. This can increase the available temperature difference and chilled water storage capacity, and improve the utilization rate of the chilled water storage.

[0011] 2) Water-cooled chillers can be connected to both low-temperature and dual-mode refrigeration units simultaneously. The system can select high-efficiency chillers to undertake the cold storage work in the corresponding temperature range. Moreover, after the cold storage cooling capacity is cascaded, the cooling starting temperature of the unit under the cold storage condition can be increased, which can effectively improve the cooling efficiency of the unit under the cold storage condition.

[0012] 3) In the water-cooled storage system, the cold storage module serves as a backup cold source, which can improve the safety and stability of the refrigeration system. The water-cooled storage system is more flexible in configuration and can be integrated with both medium and low temperature systems, which can improve the risk resistance of the entire refrigeration system.

[0013] 4) After taking the above measures, the cooling capacity of water storage can be increased, the cooling efficiency of the host can be improved, and the operating costs of the refrigeration station system can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1The utility model is a schematic structural diagram of a water cooling system applied to a medium and low temperature cooling system.

[0015] In the figure, 1 is the low-temperature refrigeration host, 2 is the dual-mode refrigeration host, 3 is the medium-temperature refrigeration host, 4 is the circulating water pump of refrigeration host A, 5 is the circulating water pump of refrigeration host B, 6 is the circulating water pump of refrigeration host C, 7 is the cold storage water pump of water storage system, 8 is the cold discharge water pump of water storage system, 9 is the cold storage device (cold storage water tank), 10 is valve A, 11 is valve B, 12 is valve C, 13 is valve D, 14 is valve E, 15 is valve F, 16 is valve G, 17 is valve H, 18 is valve I, 19 is valve J, 20 is valve K, 21 is valve L, 22 is valve M, 23 is valve N, 24 is valve O, 25 is valve P, 26 is valve Q, 27 is valve R, 28 is valve S, 29 is the medium-temperature water supply end, 30 is the medium-temperature return water end, 31 is the low-temperature water supply end, and 32 is the low-temperature return water end. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the embodiments and specific implementation methods.

[0017] like Figure 1 As shown, a water storage system for medium and low temperature cooling systems, its structure includes a low-temperature refrigeration main unit 1, a dual-mode refrigeration main unit 2, a medium-temperature refrigeration main unit 3 and a water storage device 9, wherein the high-temperature water outlet of the water storage device 9 is connected to the medium-temperature return water end 30 through the A pipeline, the middle part of the A pipeline bypasses the B pipeline to connect to the low-temperature return water end 32, the A pipeline near the medium-temperature return water end 30 bypasses the C pipeline to connect to the low-temperature return water end 32, the high-temperature water outlet of the water storage device 9 is also connected to the D pipeline with the water storage system cold water pump 7, the lower low-temperature water outlet of the water storage device 9 is connected to the E pipeline, the lower low-temperature water outlet of the water storage device 9 is also connected to the medium-temperature water supply end 29 through the F pipeline with the water storage system discharge water pump 8, the F pipeline between the water storage system discharge water pump 8 and the medium-temperature water supply end 29 bypasses the G pipeline and is connected to the low-temperature water supply end 31, and the G pipeline bypasses the H pipeline to connect to the F pipeline near the medium-temperature water supply end 29.

[0018] The inlet of the low-temperature refrigeration main unit 1 is connected to the C pipeline through the I pipeline with the C refrigeration main unit circulating water pump 6, the D pipeline bypasses the I pipeline between the C refrigeration main unit circulating water pump 6 and the inlet of the low-temperature refrigeration main unit 1, the E pipeline bypasses the J pipeline connected to the outlet of the low-temperature refrigeration main unit 1, and the H pipeline bypasses the J pipeline.

[0019] The inlet of the dual-mode refrigeration main unit 2 is connected to the C pipeline through the K pipeline with the B refrigeration main unit circulating water pump 5, the D pipeline bypasses the K pipeline between the B refrigeration main unit circulating water pump 5 and the inlet of the dual-mode refrigeration main unit 2, the H pipeline bypasses the L pipeline connected to the outlet of the dual-mode refrigeration main unit 2, and the E pipeline bypasses the L pipeline.

[0020] The C pipeline bypasses the M pipeline with the A refrigeration host circulating water pump 4 connected to the inlet of the medium-temperature refrigeration host 3, and the H pipeline bypasses the N pipeline connected to the outlet of the medium-temperature refrigeration host 3.

[0021] A valve 10-S valve 28 are also provided, which are electric valves for switching and controlling the system pipeline flow, including electric on-off valves and electric regulating valves. A valve 10-D valve 13 is used for switching the dual-mode refrigeration unit 2 between the medium-temperature refrigeration system and the low-temperature refrigeration system pipeline system.

[0022] Specifically, the A valve 10 is provided on the C pipeline between the M pipeline and the K pipeline, the B valve 11 is provided on the H pipeline between the N pipeline and the L pipeline, the C valve 12 is provided on the C pipeline between the I pipeline and the K pipeline, the D valve 13 is provided on the H pipeline between the J pipeline and the L pipeline, the E valve 14 is provided on the L pipeline between the E pipeline bypass pipe and the H pipeline, the F valve 15 is provided on the bypass pipe between the E pipeline and the L pipeline, the G valve 16 is provided on the bypass pipe between the D pipeline and the K pipeline, the H valve 17 is provided on the J pipeline between the E pipeline bypass pipe and the H pipeline, the I valve 18 is provided on the bypass pipe between the E pipeline and the J pipeline, and the J valve 19 is provided on the D pipeline. On the bypass pipe between the water storage system and the I pipeline, the K valve 20 is set on the F pipeline between the G pipeline and the H pipeline, the L valve 21 is set on the A pipeline between the B pipeline and the C pipeline, the M valve 22 is set on the G pipeline, the N valve 23 is set on the B pipeline, the O valve 24 is set on the low-temperature water inlet at the lower part of the cold storage device 9, the P valve 25 is set on the F pipeline on the side of the cold water pump 8 of the water storage system close to the low-temperature water inlet at the lower part of the cold storage device 9, the Q valve 26 is set on the D pipeline on the side of the cold water pump 7 of the water storage system close to the high-temperature water inlet at the upper part of the cold storage device 9, the S valve 28 is set on the high-temperature water inlet at the upper part of the cold storage device 9, and the R valve 27 is set on the A pipeline between the S valve 28 and the B pipeline.

[0023] That is, valve A 10 and valve B 11 are arranged in the chilled water supply and return pipeline between the medium-temperature refrigeration host 3 and the dual-mode refrigeration host 2; valve C 12 and valve D 13 are arranged in the chilled water supply and return pipeline between the low-temperature refrigeration host 1 and the dual-mode refrigeration host 2.

[0024] The E valve 14 is arranged between the chilled water outlet of the dual-mode refrigeration main unit 2 and the chilled water direct supply pipeline, and the F valve 15 is arranged between the chilled water outlet of the dual-mode refrigeration main unit 2 and the cold storage system circulation pipeline (cold storage low-temperature water supply).

[0025] The H valve 17 and the I valve 18 are located at the chilled water outlet of the low-temperature refrigeration main unit 1, and the position setting principle is the same as that of the E valve 14 and the F valve 15.

[0026] One end of the G valve 16 is located in the pipeline between the outlet of the circulating water pump 5 of the B refrigeration host and the inlet of the dual-mode refrigeration host 2, and the other end of the valve is connected to the circulation pipeline of the cold storage system (cold storage high-temperature return pipeline).

[0027] One end of the K valve 20 is located at the outlet of the cooling water pump 8 of the cooling water storage system, and the other end is connected to the medium-temperature water supply pipeline (medium-temperature water supply 10°C); one end of the M valve 22 is located at the outlet of the cooling water pump 8 of the cooling water storage system, and the other end is connected to the low-temperature water supply pipeline (low-temperature water supply 7°C).

[0028] One end of the L valve 21 is connected to the outlet pipe of the R valve 27, and the other end is connected to the medium-temperature return water pipeline (medium-temperature return water 15°C); one end of the N valve 23 is connected to the outlet pipe of the R valve 27, and the other end is connected to the low-temperature return water pipeline (low-temperature return water 7°C).

[0029] One end of the O valve 24 is connected to the bottom interface of the water cooling device 9, and the other end is connected to the inlet of the P valve 25, K valve 20, and M valve 22; one end of the S valve 28 is connected to the top interface of the water cooling device 9, and the other end is connected to the inlet pipe of the Q valve 26 and R valve 27.

[0030] One end of the P valve 25 is connected to the inlet of the cold water pump 8 of the water storage system, and the other end is connected to the outlet pipe of the O valve 24; one end of the Q valve 26 is connected to the inlet of the cold water pump 7 of the water storage system, and the other end is connected to the outlet pipe of the S valve 28.

[0031] The inlet of the R valve 27 is connected to the outlet pipe of the S valve 28 and the inlet pipe of the Q valve 26 , and the other end is connected to the inlet pipes of the L valve 21 and the N valve 23 .

[0032] When working, the following working conditions are included:

[0033] Using low-temperature refrigeration host for cold storage:

[0034] The high-temperature water at the top of the cold water storage device 9 passes through the S valve 28 and the Q valve 26, and is then pressurized and transported by the cold water storage pump 7 of the cold water storage system. It then enters the low-temperature refrigeration unit 1 through the J valve 19. After being cooled, the low-temperature outlet water returns to the bottom of the cold water storage device 9 through the I valve 18 and the O valve 24. After multiple cycles, the cold storage work is completed.

[0035] In this mode, the R valve 27 , the F valve 15 , the G valve 16 , the H valve 17 , the K valve 20 , the M valve 22 , and the P valve 25 are in the closed state.

[0036] Using dual-mode refrigeration host for cold storage:

[0037] The high-temperature water at the top of the cold water storage device 9 passes through the S valve 28 and the Q valve 26, and is then pressurized and transported by the cold water storage pump 7 of the cold water storage system. It then enters the dual-mode refrigeration host 2 through the G valve 16. After being cooled, the low-temperature outlet water returns to the bottom of the cold water storage device 9 through the F valve 15 and the O valve 24. After multiple cycles, the cold storage work is completed.

[0038] In this mode, the R valve 27 , the E valve 14 , the I valve 18 , the J valve 19 , the K valve 20 , the M valve 22 , and the P valve 25 are in the closed state.

[0039] The water storage system provides cooling to the low-temperature system:

[0040] The low-temperature water at the bottom of the cold water storage device 9 passes through the O valve 24 and the P valve 25, and then is pressurized and transported by the cold water pump 8 of the cold water storage system, and enters the low-temperature cooling pipeline system through the M valve 22. After the end heat exchange, the high-temperature return water returns to the top of the cold water storage device 9 through the N valve 23, the R valve 27, and the S valve 28;

[0041] In this mode, the K valve 20 , the L valve 21 , and the Q valve 26 are in a closed state.

[0042] The water storage system provides cooling to the medium temperature system:

[0043] The low-temperature water at the bottom of the cold water storage device 9 passes through the O valve 24 and the P valve 25, and then is pressurized and transported by the cold water pump 8 of the cold water storage system, and enters the medium-temperature cooling pipeline system through the K valve 20. After the end heat exchange, the high-temperature return water returns to the top of the cold water storage device 9 through the L valve 21, the R valve 27, and the S valve 29;

[0044] In this mode, the M valve 22 , the N valve 23 , and the Q valve 26 are in a closed state.

[0045] According to the above technical solution, the application temperature difference of the water-cooled storage system can be expanded, the cooling temperature of the water-cooled storage can be increased, and the utilization rate of the water-cooled storage device can be improved; on the other hand, because the cooling temperature of the water-cooled storage system is increased, the cold storage host can operate at a higher water outlet temperature, which can significantly improve the cooling performance coefficient of the refrigeration host.

[0046] According to the above pipeline flow design, the water cold storage system is connected to the low-temperature refrigeration host and the medium- and low-temperature dual-condition refrigeration host respectively. In the cold storage condition, the low-temperature refrigeration host or the dual-condition refrigeration host can be used to store cold respectively. The efficiency of the host is different under different water outlet temperature conditions. In actual operation, the host with high operating efficiency can be given priority for cold storage.

[0047] At the same time, under the cooling condition, the cold storage system realizes the cold supply work from the water cold storage system to the medium-temperature cooling system and the low-temperature cooling system through additional pipes and electric switching valves.

[0048] To achieve the above effects, the following steps and tasks are specifically implemented and completed:

[0049] The piping system has been innovatively designed, allowing the water storage system to be connected to the refrigeration units and cooling pipes of the low-temperature refrigeration system and the medium-temperature refrigeration system respectively;

[0050] Electric valves are installed on all pipelines that need to be switched to facilitate automatic adjustment of the system;

[0051] The parameters of the cold water storage and discharge pumps of the water storage system must meet the requirements of using the medium and low temperature refrigeration host and delivering cold water to the medium and low temperature cooling pipelines, including the process flow, head, and delivery efficiency of the circulating pump;

[0052] The group control system of the refrigeration system is adaptively designed to achieve automatic, efficient and safe switching of operating conditions including cold storage conditions of low-temperature refrigeration host, cold storage conditions of medium-temperature refrigeration host, cold supply from water storage system to medium-temperature cooling system, cold supply from water storage system to low-temperature cooling system, joint cooling of water storage system and medium-temperature refrigeration host, and joint cooling of water storage system and low-temperature refrigeration host.

[0053] The components described above are all prior art, and those skilled in the art can use any model and existing design that can achieve their corresponding functions.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A water cooling system for medium and low temperature cooling systems, characterized in that: The invention comprises a low-temperature refrigeration main unit (1), a dual-mode refrigeration main unit (2), a medium-temperature refrigeration main unit (3) and a water storage device (9), wherein the high-temperature water inlet of the water storage device (9) is connected to the medium-temperature return water end (30) through the A pipeline, the middle part of the A pipeline bypasses the B pipeline to connect to the low-temperature return water end (32), the part of the A pipeline near the medium-temperature return water end (30) bypasses the C pipeline to connect to the low-temperature return water end (32), the high-temperature water inlet of the water storage device (9) is also connected to the D pipeline with the water storage system cold water pump (7), the low-temperature water inlet of the water storage device (9) is connected to the E pipeline, the low-temperature water inlet of the water storage device (9) is also connected to the medium-temperature water supply end (29) through the F pipeline with the water storage system cooling water pump (8), the F pipeline between the water storage system cooling water pump (8) and the medium-temperature water supply end (29) bypasses the G pipeline and is connected to the low-temperature water supply end (31), the G pipeline bypasses the H pipeline to connect The F pipeline is close to the medium-temperature water supply end (29); the low-temperature refrigeration main unit (1) inlet is connected to the C pipeline through the I pipeline with the C refrigeration main unit circulating water pump (6), the D pipeline bypasses the I pipeline between the C refrigeration main unit circulating water pump (6) and the low-temperature refrigeration main unit (1) inlet, the E pipeline bypasses the J pipeline connected to the low-temperature refrigeration main unit (1) outlet, and the H pipeline bypasses the J pipeline; the dual-mode refrigeration main unit (2) inlet is connected to the C pipeline through the K pipeline with the B refrigeration main unit circulating water pump (5), the D pipeline bypasses the K pipeline between the B refrigeration main unit circulating water pump (5) and the dual-mode refrigeration main unit (2) inlet, the H pipeline bypasses the L pipeline connected to the dual-mode refrigeration main unit (2) outlet, and the E pipeline bypasses the L pipeline; the C pipeline bypasses the M pipeline with the A refrigeration main unit circulating water pump (4) connected to the inlet of the medium-temperature refrigeration main unit (3), and the H pipeline bypasses the N pipeline connected to the medium-temperature refrigeration main unit (3) outlet.

2. The water cooling system for a medium and low temperature cooling system according to claim 1, characterized in that: It also includes A valve (10)-S valve (28), A valve (10) is arranged on C pipeline between M pipeline and K pipeline, B valve (11) is arranged on H pipeline between N pipeline and L pipeline, C valve (12) is arranged on C pipeline between I pipeline and K pipeline, D valve (13) is arranged on H pipeline between J pipeline and L pipeline, E valve (14) is arranged on L pipeline between E pipeline bypass pipe and H pipeline, F valve (15) is arranged on bypass pipe between E pipeline and L pipeline, G valve (16) is arranged on bypass pipe between D pipeline and K pipeline, H valve (17) is arranged on J pipeline between E pipeline bypass pipe and H pipeline, I valve (18) is arranged on bypass pipe between E pipeline and J pipeline, J valve (19) is arranged on D pipeline On the bypass pipe between the cooling system and the I pipe, the K valve (20) is arranged on the F pipe between the G pipe and the H pipe, the L valve (21) is arranged on the A pipe between the B pipe and the C pipe, the M valve (22) is arranged on the G pipe, the N valve (23) is arranged on the B pipe, the O valve (24) is arranged on the low-temperature water inlet at the lower part of the cooling system (9), the P valve (25) is arranged on the F pipe on the side of the cooling system cooling water pump (8) close to the low-temperature water inlet at the lower part of the cooling system (9), the Q valve (26) is arranged on the D pipe on the side of the cooling system cooling water pump (7) close to the high-temperature water inlet at the upper part of the cooling system (9), the S valve (28) is arranged on the high-temperature water inlet at the upper part of the cooling system (9), and the R valve (27) is arranged on the A pipe between the S valve (28) and the B pipe.

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