Energy-saving type full-year cooling medium-high temperature chilled water system

Abstract

An energy-saving type full-year cooling medium-high temperature chilled water system comprises a cooling water supply part, an energy-saving heat exchange part and a medium-high temperature chilled water supply part, and the cooling water supply part comprises a cooling tower and a cooling water pump; the energy-saving heat exchange part comprises a plate heat exchanger; the medium-high temperature chilled water supply part comprises a cold storage water tank, a water chilling unit and process production equipment; the cooling tower is circularly communicated with the water chilling unit; a plate heat exchanger is further connected between the cooling tower and the water chilling unit; the cold water storage tank is circularly communicated with the process production equipment; and the water chilling unit is circularly communicated with the cold storage water tank. According to the scheme, a natural cold source is fully utilized, energy consumption and greenhouse gas emission are reduced, the water capacity of the system can be increased, the system can deal with capacity load fluctuation, and stable operation of water supply temperature is guaranteed; through the adjusting effect of the energy storage water tank, frequent starting and stopping of the compressor are reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of process cooling water systems, and particularly relates to an energy-saving medium-high temperature chilled water system for year-round cooling. Background Art

[0002] In the production of factories such as electronic semiconductors and injection molding, a large amount of heat energy is generated during the production process of some process equipment. Therefore, a large amount of medium-high temperature chilled water (i.e., water temperature is 15°C to 25°C) is required to cool down the production equipment, and the medium-high temperature chilled water is the annual cooling load, which is little affected by external environmental factors. Most of the current technical solutions use a chiller to first produce low-temperature chilled water (i.e., water temperature is 7°C to 12°C), and then mix it with the high-temperature return water of the process production equipment in a certain proportion, or exchange heat with a plate heat exchanger to produce medium-high temperature chilled water.

[0003] However, in the above existing solutions, the cooling load of the process production equipment is all borne by the chiller through power-consuming refrigeration, resulting in high operating energy consumption. Moreover, with the change of the production capacity of the factory, the cooling load is prone to large fluctuations, affecting the water supply temperature. And when the production capacity is low, the chiller will start and stop frequently, affecting the service life of the equipment.

[0004] Therefore, how to solve the deficiencies of the above existing technologies has become the subject to be studied and solved by the present utility model. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide an energy-saving medium-high temperature chilled water system for year-round cooling.

[0006] To achieve the above purpose, the technical solution adopted by the present utility model is:

[0007] An energy-saving medium and high temperature chilled water system for year-round cooling, comprising a cooling water supply section, an energy-saving heat exchange section, and a medium and high temperature chilled water supply section. The cooling water supply section includes a cooling tower and a cooling water pump; the energy-saving heat exchange section includes a plate heat exchanger; the medium and high temperature chilled water supply section includes a chilled water storage tank and a chiller. The cooling tower and the chiller are arranged in a circulating connection; the water outlet end of the cooling tower is connected to the water inlet end of the first side of the chiller through a main cooling water return pipe; the water inlet end of the cooling tower is connected to the water outlet end of the first side of the chiller through a main cooling water guiding pipe; the cooling water pump is connected in series on the main cooling water return pipe. The chilled water storage tank is arranged in a circulating connection with a process production device; the water outlet end of the process production device is connected to the water inlet end of the first side of the chilled water storage tank through a main medium and high temperature chilled water return pipe; the water inlet end of the process production device is connected to the water outlet end of the first side of the chilled water storage tank through a main medium and high temperature chilled water guiding pipe. The chiller and the chilled water storage tank are arranged in a circulating connection; the water outlet end of the second side of the chiller is connected to the water inlet end of the chilled water storage tank through a low temperature chilled water guiding pipe; the water inlet end of the second side of the chiller is connected to the water outlet end of the chilled water storage tank through a low temperature chilled water return pipe. The first water inlet end of the plate heat exchanger is connected to the water outlet end of the cooling tower, the first water outlet end of the plate heat exchanger is connected to the water inlet end of the first side of the chiller, the second water inlet end of the plate heat exchanger is connected to the water outlet end of the process production device, and the second water outlet end of the plate heat exchanger is connected to the water inlet end of the first side of the chilled water storage tank.

[0008] Further technical solution, at least one group of condensers is provided inside the chiller.

[0009] Further technical solution, a first chilled water pump is provided between the chilled water storage tank and the chiller, and the first chilled water pump is connected in the low temperature chilled water return pipe.

[0010] Further technical solution, a second chilled water pump is provided between the chilled water storage tank and the process production device, and the second chilled water pump is connected in the main medium and high temperature chilled water guiding pipe.

[0011] Further technical solution, the first end of the main cooling water return pipe is connected to the cooling tower. The second end of the main cooling water return pipe is branched into a direct cooling water return pipe and a bypass cooling water return pipe. The direct cooling water return pipe is connected to the first water inlet end of the plate heat exchanger. The bypass cooling water return pipe is branched into a first bypass cooling water return branch pipe and a second bypass cooling water return branch pipe. The first bypass cooling water return branch pipe is connected to the chiller. The second bypass cooling water return branch pipe is connected to the first water outlet end of the plate heat exchanger.

[0012] Further technical solution: The first end of the medium-high temperature chilled water return main pipe is connected and arranged on the process production equipment. The second end of the medium-high temperature chilled water return main pipe is branched into a medium-high temperature chilled water return direct pipe and a medium-high temperature chilled water return bypass pipe. The medium-high temperature chilled water return direct pipe is connected to the second water inlet end of the plate heat exchanger. The medium-high temperature chilled water return bypass pipe is branched into a first medium-high temperature chilled water return bypass branch pipe and a second medium-high temperature chilled water return bypass branch pipe. The first medium-high temperature chilled water return bypass branch pipe is connected and arranged with the cold water storage tank. The second medium-high temperature chilled water return bypass branch pipe is connected to the second water outlet end of the plate heat exchanger.

[0013] Further technical solution: A second control valve for throttling adjustment is provided on the medium-high temperature chilled water return direct pipe, and the second control valve is arranged at the second water inlet end of the plate heat exchanger.

[0014] Further technical solution: A first control valve for throttling adjustment is provided on the medium-high temperature chilled water return bypass pipe.

[0015] Further technical solution: A fourth control valve for throttling adjustment is provided on the cooling water return direct pipe, and the fourth control valve is arranged at the first water inlet end of the plate heat exchanger.

[0016] Further technical solution: A third control valve for throttling adjustment is provided on the cooling water return bypass pipe.

[0017] Regarding the "first", "second", etc. used in this article, they do not particularly refer to the meaning of order or sequence, nor are they used to limit this case. They are only used to distinguish components or operations described with the same technical terms.

[0018] Regarding the "connection" or "positioning" used in this article, it can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, and can also refer to two or more components or devices operating or acting on each other.

[0019] Regarding the "including", "comprising", "having", etc. used in this article, they are all open-ended terms, that is, they mean including but not limited to.

[0020] Regarding the terms used in this article, unless otherwise specified, they usually have the ordinary meaning of each term used in this field, in the context of this case, and in the special context. Some terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of this case.

[0021] Regarding terms such as "front", "rear", "upper", "lower", "left", and "right" used in this article, they are all directional terms. In this case, they are only used to illustrate the positional relationship between various structures and do not limit the specific direction of the protection solution and actual implementation of this case.

[0022] The working principle and advantages of the present utility model are as follows:

[0023] Compared with the prior art, the present utility model makes full use of natural cold sources, reduces energy consumption and greenhouse gas emissions, and can achieve energy conservation and emission reduction.

[0024] The present utility model can bring significant economic benefits by saving the electricity required for refrigeration.

[0025] By increasing the system water capacity, the present utility model helps the system cope with fluctuations in production capacity load and ensures the stable operation of the water supply water temperature; through the regulation of the energy storage water tank, the frequent start and stop of the compressor are reduced, thereby extending the service life of the equipment. Brief Description of the Drawings

[0026] Appendix Figure 1 is the overall system framework diagram of the present utility model;

[0027] Appendix Figure 2 is the operating state diagram of the system (operation of a part of the equipment) of the present utility model in the summer working condition along the direction shown by a;

[0028] Appendix Figure 3 is the operating state diagram of the system (operation of all equipment) of the present utility model in the transitional season working condition along the direction shown by b;

[0029] Appendix Figure 4 is the operating state diagram of the system (operation of another part of the equipment) of the present utility model in the winter working condition along the direction shown by c.

[0030] In the above drawings: 1. Cooling tower; 2. Cooling water pump; 3. Plate heat exchanger; 31. First water inlet end; 32. First water outlet end; 33. Second water inlet end; 34. Second water outlet end; 4. Cold water storage tank; 5. First chilled water pump; 6. Chiller; 7. Second chilled water pump; 8. Process production equipment; 9. First control valve; 10. Second control valve; 11. Third control valve; 12. Fourth control valve; 13. Main cooling water return pipe; 131. Direct cooling water return pipe; 132. Bypass cooling water return pipe; 1321. First bypass branch of cooling water return pipe; 1322. Second bypass branch of cooling water return pipe; 14. Main cooling water guiding pipe; 15. Low-temperature chilled water guiding pipe; 16. Low-temperature chilled water return pipe; 17. Main return pipe of medium-high temperature chilled water; 171. Direct return pipe of medium-high temperature chilled water; 172. Bypass return pipe of medium-high temperature chilled water; 1721. First bypass branch of medium-high temperature chilled water return pipe; 1722. Second bypass branch of medium-high temperature chilled water return pipe; 18. Main guiding pipe of medium-high temperature chilled water. Detailed implementation mode

[0031] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0032] Embodiment: The present case will be clearly described below with diagrams and detailed descriptions. After any person skilled in the art understands the embodiments of the present case, they can make changes and modifications based on the technology taught by the present case, which do not depart from the spirit and scope of the present case.

[0033] The terms used in this article are only for describing specific embodiments and are not intended to limit the present case. Singular forms such as "a", "this", "this", "the present", and "the" also include plural forms as used herein.

[0034] Refer to the attached Figure 1 As shown, an energy-saving medium-high temperature chilled water system for year-round cooling of the present utility model includes a cooling water supply section, an energy-saving heat exchange section, and a medium-high temperature chilled water supply section. The cooling water supply section includes a cooling tower 1 and a cooling water pump 2. The energy-saving heat exchange section includes a plate heat exchanger 3. The medium-high temperature chilled water supply section includes a cold water storage tank 4, a chiller 6, and process production equipment 8. At least one set of condensers is provided inside the chiller 6.

[0035] The cooling tower 1 and the chiller 6 are connected in a circulating manner, and the plate heat exchanger 3 is also connected between the cooling tower 1 and the chiller 6.

[0036] The cold water storage tank 4 and the process production equipment 8 are connected in a circulating manner.

[0037] The chiller 6 and the cold water storage tank 4 are connected in a circulating manner.

[0038] The water outlet end of the cooling tower 1 is connected to the water inlet end on the first side of the chiller 6 through a main cooling water return pipe 13; the water inlet end of the cooling tower 1 is connected to the water outlet end on the first side of the chiller 6 through a main cooling water guiding pipe 14.

[0039] The cooling water pump 2 is connected in series on the main cooling water return pipe 13.

[0040] The first end of the main cooling water return pipe 13 is connected to the cooling tower 1. The second end of the main cooling water return pipe 13 is branched into a direct cooling water return pipe 131 and a bypass cooling water return pipe 132. The direct cooling water return pipe 131 is connected to the first water inlet end 31 of the plate heat exchanger 3; the bypass cooling water return pipe 132 is branched into a first bypass cooling water return pipe 1321 and a second bypass cooling water return pipe 1322. The first bypass cooling water return pipe 1321 is connected to the chiller 6; the second bypass cooling water return pipe 1322 is connected to the first water outlet end 32 of the plate heat exchanger 3.

[0041] The water outlet end of the process production equipment 8 is connected to the water inlet end on the first side of the cold water storage tank 4 through a main medium-high temperature chilled water return pipe 17; the water inlet end of the process production equipment 8 is connected to the water outlet end on the first side of the cold water storage tank 4 through a main medium-high temperature chilled water guiding pipe 18.

[0042] The first end of the main medium-high temperature chilled water return pipe 17 is connected to the process production equipment 8. The second end of the main medium-high temperature chilled water return pipe 17 is branched into a direct medium-high temperature chilled water return pipe 171 and a bypass medium-high temperature chilled water return pipe 172. The direct medium-high temperature chilled water return pipe 171 is connected to the second water inlet end 33 of the plate heat exchanger 3; the bypass medium-high temperature chilled water return pipe 172 is branched into a first bypass medium-high temperature chilled water return pipe 1721 and a second bypass medium-high temperature chilled water return pipe 1722. The first bypass medium-high temperature chilled water return pipe 1721 is connected to the cold water storage tank 4; the second bypass medium-high temperature chilled water return pipe 1722 is connected to the second water outlet end 34 of the plate heat exchanger 3.

[0043] The water outlet end on the second side of the chiller 6 is connected to the water inlet end of the cold water storage tank 4 through a low-temperature chilled water guiding pipe 15; the water inlet end on the second side of the chiller 6 is connected to the water outlet end of the cold water storage tank 4 through a low-temperature chilled water return pipe 16.

[0044] A first chilled water pump 5 is provided between the cold water storage tank 4 and the chiller 6, and the first chilled water pump 5 is connected and arranged on the low-temperature chilled water return pipe 16; a second chilled water pump 7 is provided between the cold water storage tank 4 and the process production equipment 8, and the second chilled water pump 7 is connected and arranged on the medium- and high-temperature chilled water water guide pipe 18.

[0045] A second control valve 10 for cut-off regulation is provided on the medium- and high-temperature chilled water return straight pipe 171, and the second control valve 10 is arranged at the first water outlet end 32 of the plate heat exchanger 3; a first control valve 9 for cut-off regulation is provided on the medium- and high-temperature chilled water return bypass pipe 172.

[0046] A fourth control valve 12 for flow cut-off regulation is disposed on the cooling water return straight pipe 131 , and the fourth control valve 12 is disposed at the first water inlet end 31 of the plate heat exchanger 3 .

[0047] The cooling water return bypass pipe 132 is provided with a third control valve 11 for flow cut-off regulation.

[0048] See attached Figure 2 As shown, in summer, the following equipment is turned on: cooling tower 1, cooling water pump 2, third control valve 11; chiller 6, first chilled water pump 5, cold water storage tank 4, second chilled water pump 7, first control valve 9; all other equipment is closed, the system operates in normal refrigeration conditions, and water circulation circulates along direction a.

[0049] Cooling water side: The outlet water of cooling tower 1 is cooling water (32°C). After being sucked in and pressurized by cooling water pump 2, the third control valve 11 is started, and the cooling water enters the water inlet of the condenser of chiller 6. After condensation and heat release, the cooling water is heated at the outlet (37°C) and then enters the water inlet of cooling tower 1 for cooling.

[0050] Chilled water side: The water outlet from the low temperature side of the cold water storage tank 4 is chilled water (12°C), which is sucked and pressurized by the first chilled water pump 5 and enters the water inlet of the evaporator of the chiller 6. After evaporation and heat absorption, the chilled water outlet is cooled to 7°C and then enters the water inlet of the low temperature side of the cold water storage tank 4. The chilled water at 25°C on the high temperature side of the cold water storage tank 4 is mixed with the chilled water at 7°C on its low temperature side, and 20°C chilled water is produced at the high temperature side of the cold water storage tank 4. The 20°C chilled water is sucked and pressurized by the second chilled water pump 7 and then flows into the water inlet of the process production equipment 8. After the process production equipment 8 releases heat, the water outlet is heated to chilled water (25°C). Then, by starting the first control valve 9, the chilled water enters the high temperature side of the cold water storage tank 4.

[0051] See attached Figure 3As shown, when in the (spring and autumn) transition season, the cooling tower 1, the cooling water pump 2, and the fourth control valve 12 are opened; the chiller 6, the first chilled water pump 5, and the chilled water storage tank 4; the second chilled water pump 7, the plate heat exchanger 3, and the second control valve 10 are opened, and all other equipment is closed, so that the cooling load of some process production equipment is exchanged through natural cold sources, and the chiller is assisted to start and run according to the needs of the supply water temperature, and the water circulation is along the b direction.

[0052] Cooling water side: The cooling water (≤20 °C) discharged from the cooling tower 1 is sucked and pressurized by the cooling water pump 2, and then enters the low-temperature side water inlet of the plate heat exchanger 3 through the fourth control valve 12. After heat exchange, the water temperature at the outlet rises to cooling water (≤25 °C), enters the condenser of the chiller 6, and after condensation and heat release, the water temperature at its outlet rises to cooling water (≤30 °C), and then enters the cooling tower 1 to be cooled.

[0053] Chilled water side: The chilled water (12 °C) discharged from the low-temperature side of the chilled water storage tank 4 is sucked and pressurized by the first chilled water pump 5, enters the evaporator water inlet of the chiller 6, and after evaporation and heat absorption, the water temperature at the outlet drops to chilled water (7 °C), and then enters the low-temperature side of the chilled water storage tank 4; the chilled water (20 °C) discharged from the high-temperature side of the chilled water storage tank 4 is sucked and pressurized by the second chilled water pump 7, enters the water inlet of the process production equipment 8, and after heat release by the process production equipment 8, the water temperature at the outlet rises to 25 °C chilled water, and then enters the high-temperature side water inlet of the plate heat exchanger 3 through the second control valve 10. After heat exchange, the water temperature at the outlet drops to ≥20 °C chilled water, and then enters the high-temperature side water inlet of the chilled water storage tank 4. The chilled water ≥20 °C at the high-temperature side water inlet of the chilled water storage tank 4 is fully mixed with the 7 °C chilled water at its low-temperature side inlet, and 20 °C chilled water is generated at the high-temperature side outlet of the chilled water storage tank 4.

[0054] See the appendix Figure 4 As shown, when in winter, the following equipment is opened: the cooling tower 1, the cooling water pump 2, and the fourth control valve 12; the chilled water storage tank 4, the second chilled water pump 7; the plate heat exchanger 3, and the second control valve 10; all other equipment is closed, and the system operates in an energy-saving mode, and the water circulation is along the c direction.

[0055] Cooling water side: The cooling water (15 °C) discharged from the cooling tower 1 is sucked and pressurized by the cooling water pump 2, and by starting the fourth control valve 12, the cooling water enters the low-temperature side water inlet of the plate heat exchanger 3. After heat exchange, the water temperature rises to cooling water (20 °C) at the outlet of the plate heat exchanger 3, and then flows through the inlet / outlet of the condenser of the chiller 6. In this condition, the condenser of the chiller 6 does not start, and the cooling water at the outlet of the condenser remains at 20 °C, and then the cooling water enters the cooling tower 1 to be cooled.

[0056] Chilled water side: The chilled water (20°C) discharged from the high-temperature side of the chilled water storage tank 4 is sucked in and pressurized by the second chilled water pump 7, and then enters the water inlet of the process production equipment 8. After the chilled water releases heat through the process production equipment 8, the water temperature at the water outlet rises to 25°C, and then enters the high-temperature side of the plate heat exchanger 3 by opening the second control valve 10. After heat exchange, the water temperature at the water outlet drops to chilled water (20°C), and then enters the high-temperature side of the chilled water storage tank 4 again.

[0057] In summary, after the outdoor temperature meets the conditions, make full use of the natural cold source to bear part or all of the equipment cooling load through natural cooling, so as to achieve the energy-saving effect of system operation. Increase the system water capacity through the chilled water storage tank, extend the buffer time after system fluctuations, maintain the stability of the supply water temperature, avoid frequent start and stop of the chiller, and extend the service life of the equipment.

[0058] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and its purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. An energy-saving medium and high temperature chilled water system for year-round cooling, characterized in that: It includes a cooling water supply section, an energy-saving heat exchange section, and a medium-high temperature chilled water supply section; The cooling water supply section includes a cooling tower (1) and a cooling water pump (2); The energy-saving heat exchange section includes a plate heat exchanger (3); The medium-high temperature chilled water supply section includes a chilled water storage tank (4) and a chiller (6); The cooling tower (1) and the chiller (6) are arranged in a circulating connection; the water outlet end of the cooling tower (1) is connected to the water inlet end of the first side of the chiller (6) through a cooling water return main pipe (13); the water inlet end of the cooling tower (1) is connected to the water outlet end of the first side of the chiller (6) through a cooling water guiding main pipe (14); the cooling water pump (2) is connected in series on the cooling water return main pipe (13); The chilled water storage tank (4) and a process production device (8) are arranged in a circulating connection; the water outlet end of the process production device (8) is connected to the water inlet end of the first side of the chilled water storage tank (4) through a medium-high temperature chilled water return main pipe (17); the water inlet end of the process production device (8) is connected to the water outlet end of the first side of the chilled water storage tank (4) through a medium-high temperature chilled water guiding main pipe (18); The chiller (6) and the chilled water storage tank (4) are arranged in a circulating connection; the water outlet end of the second side of the chiller (6) is connected to the water inlet end of the chilled water storage tank (4) through a low-temperature chilled water guiding pipe (15); the water inlet end of the second side of the chiller (6) is connected to the water outlet end of the chilled water storage tank (4) through a low-temperature chilled water return pipe (16); The first water inlet end (31) of the plate heat exchanger (3) is connected to the water outlet end of the cooling tower (1), and the first water outlet end (32) of the plate heat exchanger (3) is connected to the water inlet end of the first side of the chiller (6); The second water inlet end (33) of the plate heat exchanger (3) is connected to the water outlet end of the process production device (8), and the second water outlet end (34) of the plate heat exchanger (3) is connected to the water inlet end of the first side of the chilled water storage tank (4).

2. The energy-saving medium and high temperature chilled water system for year-round cooling according to claim 1, wherein: At least one set of condensers is provided inside the chiller (6).

3. An energy-saving medium and high temperature chilled water system for year-round cooling according to claim 1, characterized in that: A first chilled water pump (5) is provided between the chilled water storage tank (4) and the chiller (6), and the first chilled water pump (5) is connected in a communicating manner on the low-temperature chilled water return pipe (16).

4. An energy-saving medium- and high-temperature chilled water system for year-round cooling according to claim 1, wherein: A second chilled water pump (7) is provided between the chilled water storage tank (4) and the process production device (8), and the second chilled water pump (7) is connected in a communicating manner on the medium-high temperature chilled water guiding main pipe (18).

5. An energy-saving medium and high temperature chilled water system for year-round cooling according to claim 1, characterized in that: The first end of the cooling water return main pipe (13) is connected in a communicating manner to the cooling tower (1); The second end of the cooling water return main pipe (13) is branched into a cooling water return direct pipe (131) and a cooling water return bypass pipe (132); The cooling water return direct pipe (131) is connected to the first water inlet end (31) of the plate heat exchanger (3); The cooling water return bypass pipe (132) is branched into a first branch pipe (1321) of the cooling water return bypass and a second branch pipe (1322) of the cooling water return bypass; The first branch pipe (1321) of the return water bypass of the cooling water is connected to the chiller (6); The second branch pipe (1322) of the return water bypass of the cooling water is connected to the first water outlet end (32) of the plate heat exchanger (3).

6. An energy-saving medium- and high-temperature chilled water system for year-round cooling according to claim 1, wherein: The first end of the main pipe (17) for the return water of medium and high temperature chilled water is connected to the process production equipment (8); The second end of the main pipe (17) for the return water of medium and high temperature chilled water is provided with a direct pipe (171) for the return water of medium and high temperature chilled water and a bypass pipe (172) for the return water of medium and high temperature chilled water; The direct pipe (171) for the return water of medium and high temperature chilled water is connected to the second water inlet end (33) of the plate heat exchanger (3); The bypass pipe (172) for the return water of medium and high temperature chilled water is provided with a first branch pipe (1721) for the return water of medium and high temperature chilled water and a second branch pipe (1722) for the return water of medium and high temperature chilled water; The first branch pipe (1721) for the return water of medium and high temperature chilled water is connected to the cold water storage tank (4); The second branch pipe (1722) for the return water of medium and high temperature chilled water is connected to the second water outlet end (34) of the plate heat exchanger (3).

7. An energy-saving medium- and high-temperature chilled water system for year-round cooling according to claim 1, characterized in that: A second control valve (10) for throttling adjustment is provided on the direct pipe (171) for the return water of medium and high temperature chilled water, and the second control valve (10) is arranged at the second water inlet end (33) of the plate heat exchanger (3).

8. An energy-saving medium and high temperature chilled water system for year-round cooling according to claim 1, characterized in that: A first control valve (9) for throttling adjustment is provided on the bypass pipe (172) for the return water of medium and high temperature chilled water.

9. An energy-saving medium and high temperature chilled water system for year-round cooling according to claim 5, characterized in that: A fourth control valve (12) for throttling adjustment is provided on the direct pipe (131) for the return water of the cooling water, and the fourth control valve (12) is arranged at the first water inlet end (31) of the plate heat exchanger (3).

10. An energy-saving medium- and high-temperature chilled water system for year-round cooling according to claim 5, characterized in that: A third control valve (11) for throttling adjustment is provided on the bypass pipe (132) for the return water of the cooling water.

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