A data center multi-cold source conversion device and control method

Abstract

The present invention provides a multi-cold source conversion device for a data center, which is provided with a refrigerator, a cooling tower and a plate heat exchanger. When the refrigerator provides cooling, the evaporator, the chilled water supply pipe, the load device, the chilled water return pipe, and the first water pump form a circulating refrigeration loop, and the refrigerator provides cooling and cooling for the load device. When the refrigerator and the plate heat exchanger jointly provide cooling, the evaporator, the chilled water supply pipe, the load device, the chilled water return pipe, the first water pump, and the plate heat exchanger form a circulating loop, and the plate heat exchanger and the refrigerator simultaneously provide cooling and cooling for the load device. When the plate heat exchanger provides cooling, the plate heat exchanger, the chilled water return pipe, the chilled water supply pipe, the load device, and the first water pump form a circulating loop, and the plate heat exchanger provides cooling and cooling for the load device. The entire device is also provided with a third water pump and a converging three-way valve, which ensure the effective operation of the refrigerator, so that the refrigerator and the plate heat exchanger jointly provide cooling, and the plate heat exchanger provides cooling for free to achieve a smooth transition.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to a multi-cold source conversion device for a data center and a control method. Background Art

[0002] The data room is equipped with electronic computer systems, servers, communication systems and other data processing, storage and network communication equipment that run 24 hours a day throughout the year. The above equipment generates a lot of heat, causing the temperature in the data room to rise. In order to ensure the normal operation of the equipment, uninterrupted cooling is required throughout the year, and the cooling system is required to have extremely high reliability and relatively energy-saving.

[0003] In order to ensure that the PUE of the data room is low enough, the existing data room cooling system generally chooses a location with good natural resources so that free cooling technology can be fully utilized. There are generally three working conditions for the data room cooling system using free cooling technology: one is that the chiller alone provides cooling, the second is that the chiller and the plate heat exchanger provide cooling at the same time, and the third is that the plate heat exchanger provides free cooling completely.

[0004] However, the existing cooling system cannot switch between different working conditions, or cannot switch smoothly. The switching process has a great impact on the temperature of the load device. Most projects give up using free cooling because it cannot be smoothly implemented, or use two independent cooling systems to realize the functions of chiller cooling and free cooling respectively. The main reason for the failure to use is that during the switching process, the cooling water temperature cannot meet the internal requirements of the chiller, causing the chiller to shut down abnormally and unable to load. Even in the process of waiting for the chiller to start or stop, the temperature of the load device data room rises due to unstable system operation. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned technology and to provide a multi-cold source conversion device for a data center, which can realize a smooth transition between cooling by a refrigerator alone, cooling by a refrigerator and a plate heat exchanger together, and cooling by a plate heat exchanger alone for free, without causing abnormalities in the refrigerator.

[0006] To this end, the present invention provides a multi-cold source conversion device for a data center, which is provided with a refrigerator, a cooling tower, a plate heat exchanger and a load device. The refrigerator includes an evaporator and a condenser. The evaporator can supply cooling to the load device independently, and the cooling tower can also supply cooling to the load device independently through the plate heat exchanger. The evaporator can also supply cooling to the load device in conjunction with the plate heat exchanger. The condenser is also provided with a circulating cooling unit, so that the entire system can achieve a smooth transition when switching between cooling by the refrigerator, cooling jointly by the refrigerator and the plate heat exchanger, and free cooling by the plate heat exchanger.

[0007] Preferably, both ends of the evaporator are connected to the load device through a chilled water supply pipe and a chilled water return pipe respectively, the chilled water return pipe is provided with a first water pump, a first electric valve and a third electric valve in sequence, the chilled water supply pipe and the chilled water return pipe are also connected through a pipeline to be provided with a fourth electric valve, and the connection point between the pipeline where the fourth electric valve is located and the chilled water return pipe is located between the first electric valve and the third electric valve. The cooling tower is connected to the condenser through a cooling tower outlet pipe and a cooling tower inlet pipe, the cooling tower outlet pipe is provided with a second water pump, a fifth electric valve and a seventh electric valve in sequence, the cooling tower outlet pipe and the cooling tower inlet pipe are also connected through a pipeline to be provided with an eighth electric valve, and the connection point between the pipeline where the eighth electric valve is located and the cooling tower outlet pipe is located between the fifth electric valve and the seventh electric valve.

[0008] The two ends of the cold side channel of the plate heat exchanger are connected to the cooling tower outlet pipe through the primary side water inlet pipe of the heat exchanger and the primary side water outlet pipe of the heat exchanger, respectively. The primary side water inlet pipe of the heat exchanger is provided with a sixth electric valve, and the connection point between the primary side water inlet pipe of the heat exchanger and the cooling tower outlet pipe is arranged between the second water pump and the fifth electric valve, and the connection point between the primary side water outlet pipe of the heat exchanger and the cooling tower outlet pipe is arranged between the fifth electric valve and the seventh electric valve. The two ends of the hot side channel of the plate heat exchanger are connected to the chilled water return pipe through the secondary side water inlet pipe of the heat exchanger and the secondary side water outlet pipe of the heat exchanger, respectively. The secondary side water inlet pipe of the heat exchanger is provided with a second electric valve, and the connection point between the secondary side water inlet pipe of the heat exchanger and the chilled water return pipe is arranged between the first water pump and the first electric valve, and the connection point between the secondary side water outlet pipe of the heat exchanger and the chilled water return pipe is arranged between the first electric valve and the third electric valve.

[0009] The circulating cooling unit includes a third water pump and a converging three-way valve. The cooling tower outlet pipe and the cooling tower inlet pipe are connected to the converging three-way valve through a pipeline. The A port of the converging three-way valve is connected to the cooling tower outlet pipe through a pipeline. The connection point of the pipeline where the A port of the converging three-way valve is located and the cooling tower outlet pipe is arranged between the fifth electric valve and the seventh electric valve, and is arranged after the connection point of the pipeline where the eighth electric valve is located and the cooling tower outlet pipe; the AB port of the converging three-way valve is also connected to the cooling tower outlet pipe through a pipeline. The pipeline where the AB port of the converging three-way valve is located is also connected to a third water pump. The connection point of the pipeline where the AB port of the converging three-way valve is located and the cooling tower outlet pipe is arranged after the seventh electric valve; the B port of the converging three-way valve is connected to the cooling tower inlet pipe through a pipeline. The connection point of the pipeline where the B port of the converging three-way valve is located and the cooling tower inlet pipe is arranged before the connection point of the pipeline where the eighth electric valve is located and the cooling tower inlet pipe.

[0010] Preferably, when the refrigerator provides cooling, the evaporator, the chilled water supply pipe, the load device, the chilled water return pipe, and the first water pump form a circulation loop; the cooling tower, the cooling tower outlet pipe, the second water pump, the condenser, and the cooling tower inlet pipe form a circulation loop.

[0011] Preferably, when the refrigerator and the plate heat exchanger jointly provide cooling, the evaporator, the chilled water supply pipe, the load device, the chilled water return pipe, the first water pump, and the plate heat exchanger form a circulation loop; the cooling tower, the cooling tower outlet pipe, the second water pump, the plate heat exchanger, and the cooling tower inlet pipe form a circulation loop; the condenser and the third water pump form a circulation loop.

[0012] Preferably, when the plate heat exchanger provides free cooling, the plate heat exchanger, the chilled water return pipe, the chilled water supply pipe, the load device, and the first water pump form a circulation loop; the cooling tower, the cooling tower outlet pipe, the second water pump, the plate heat exchanger, and the cooling tower inlet pipe form a circulation loop.

[0013] Preferably, the pipeline where the AB port of the converging three-way valve is located is also connected to a one-way valve, and the one-way valve is arranged after the third water pump.

[0014] Preferably, a temperature sensor is also provided at one end of the cooling tower water inlet pipe close to the condenser, and the temperature sensor is arranged before the connection point between the pipeline where the B port of the converging three-way valve is located and the cooling tower water inlet pipe.

[0015] A control method for switching multiple cooling sources in a data room uses the multiple cooling source switching device in the data room to control the smooth switching between cooling supplies from multiple cooling sources in the data room.

[0016] Preferably, when the cooling supply from the refrigerator is switched to the combined cooling supply of the refrigerator and the plate heat exchanger, the first electric valve and the fourth electric valve are closed on the freezing side, and the second electric valve and the third electric valve are opened; the fifth electric valve and the seventh electric valve are closed on the cooling side, and the sixth electric valve and the eighth electric valve are opened, and the one-way valve is opened at the same time, and the third water pump is started; under the action of the first water pump, the chilled water is first cooled and cooled by the plate heat exchanger, and then cooled by the evaporator to cool the load device; and on the cooling side, the cooling tower, the cooling tower water outlet pipe, the second water pump, the primary side water inlet pipe of the heat exchanger, the plate heat exchanger, the primary side water outlet pipe of the heat exchanger, and the cooling tower water inlet pipe form a circulation loop, and the cooling water in the cooling tower cools the chilled water on the freezing side through the plate heat exchanger; the third water pump and the condenser form a circulation loop through the pipeline to ensure the normal operation of the refrigerator;

[0017] When switching from combined cooling to plate heat exchanger cooling alone, shut down the refrigerator until it is completely shut down, close the third electric valve, open the fourth electric valve, close the third water pump and the one-way valve, and complete the smooth transition from combined cooling of the refrigerator and plate heat exchanger to cooling alone of the plate heat exchanger;

[0018] When switching from single cooling by plate heat exchanger to combined cooling, the fourth electric valve is closed on the freezing side, the third electric valve is opened, the one-way valve and the third water pump are opened on the cooling side, and then the refrigerator is turned on to realize smooth transition from single cooling by plate heat exchanger to combined cooling by refrigerator and plate heat exchanger;

[0019] When switching from joint cooling to cooling by the chiller alone, the second electric valve is closed on the freezing side and the first electric valve is opened; the sixth electric valve is closed on the cooling side and the fifth electric valve is opened; when the output water temperature of the cooling tower rises to meet the cooling requirements of the condenser, the eighth electric valve, the one-way valve and the third water pump are closed, and the seventh electric valve is opened to realize the switching from joint cooling by the chiller and the plate heat exchanger to cooling by the chiller alone;

[0020] During the whole process, in order to meet the cooling requirements of the condenser, the opening of the converging three-way valve can be adjusted to adjust the water temperature in the circulation loop formed by the third water pump and the condenser to ensure the normal operation of the refrigerator.

[0021] The present invention provides a multi-cold source conversion device for a data center, which has the following beneficial effects:

[0022] The present invention is provided with a third water pump and a converging three-way valve. When the system switches between cooling by a refrigerator, combined cooling by a refrigerator and a plate heat exchanger, and free cooling by a plate heat exchanger alone, the third water pump forms a circulation loop with the condenser to meet the cooling requirements of the condenser and ensure the effective operation of the refrigerator. The refrigerator will not be abnormally shut down due to the sudden entry of low-temperature water from the cooling tower into the condenser, or even the temperature of the data room of the load device will rise. A smooth transition between cooling by a refrigerator, combined cooling by a refrigerator and a plate heat exchanger, and free cooling by a plate heat exchanger is achieved. When the water temperature in the circulation loop formed by the third water pump and the condenser is not enough to cool the condenser, the converging three-way valve is adjusted to allow the low-temperature water output from the cooling tower to enter the circulation loop formed by the third water pump and the condenser until the normal operation requirements of the refrigerator are met.

[0023] During the operation of the entire device, each conversion between different working conditions achieved a smooth transition, the refrigerator operated or stopped working effectively, and had no impact on the temperature of the load device, ensuring stable and continuous production and improving production efficiency. At the same time, it made full use of the free cold source, maximized the use time of the free cold source, and reduced production energy consumption and the PUE of the data room.

[0024] In actual operation, the use of this technology in the data statistics computer room can bring 25-50% energy savings in winter, meeting the requirements of sustainable development while reducing the company's production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the circulation loop of the refrigerator of the present invention when providing cooling;

[0026] Figure 2 It is a schematic diagram of the structure of the circulation loop when the refrigerator and the plate heat exchanger of the present invention are combined to provide cooling;

[0027] Figure 3 It is a schematic diagram of the structure of the circulation loop of the plate heat exchanger of the present invention when providing cooling alone for free;

[0028] Figure 4 It is a schematic diagram of the structure of the circulation loop when the merging three-way valve is adjusted in the combined cooling process of the refrigerator and the plate heat exchanger of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the circulation circuit when switching from the combined cooling of the refrigerator and the plate heat exchanger to the cooling of the refrigerator alone in the present invention.

[0030] Markings in the figure: 1. Evaporator, 11. Chilled water supply pipe, 12. Chilled water return pipe, 121. First water pump, 122. First electric valve, 123. Third electric valve, 124. Fourth electric valve, 2. Condenser, 3. Cooling tower, 31. Cooling tower outlet pipe, 311. Second water pump, 312. Fifth electric valve, 313. Seventh electric valve, 314. Eighth electric valve, 32. Cooling tower inlet pipe, 321. Temperature sensor, 4. Load device, 5. Plate heat exchanger, 51. Primary side inlet pipe of heat exchanger, 511. Sixth electric valve, 52. Primary side outlet pipe of heat exchanger, 53. Secondary side inlet pipe of heat exchanger, 531. Second electric valve, 54. Secondary side outlet pipe of heat exchanger, 55. Converging three-way valve, 56. Third water pump, 57. One-way valve. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments to help understand the content of the present invention. The methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercial products unless otherwise specified.

[0032] Depend on Figure 1 As shown, the present invention provides a multi-cold source conversion device for a data center, which is provided with a refrigerator, a cooling tower 3, a plate heat exchanger 5 and a load device 4. The refrigerator includes an evaporator 1 and a condenser 2. The evaporator 1 can supply cooling to the load device 4 independently, and the cooling tower 3 can also supply cooling to the load device 4 independently through the plate heat exchanger 5. The evaporator 1 can also supply cooling to the load device 4 in combination with the plate heat exchanger 5. The condenser 2 is also provided with a circulating cooling unit, so that the entire system can achieve a smooth transition when switching between cooling by the refrigerator, cooling by the refrigerator and the plate heat exchanger 5, and free cooling by the plate heat exchanger 5.

[0033] Further, both ends of the evaporator 1 are connected to the load device 4 through the chilled water supply pipe 11 and the chilled water return pipe 12 to form a circulation loop. The chilled water return pipe 12 is provided with a first water pump 121, a first electric valve 122 and a third electric valve 123 in sequence. The chilled water supply pipe 11 and the chilled water return pipe 12 are also connected to a fourth electric valve 124 through a pipeline. The connection point between the pipeline where the fourth electric valve 124 is located and the chilled water return pipe 12 is located between the first electric valve 122 and the third electric valve 123. The pipeline where the fourth electric valve 124 is located is connected in parallel with the pipeline where the evaporator 1 is located, so as to facilitate the control of the connection and disconnection of the evaporator 1. The cooling tower 3 is connected to the condenser 2 through the cooling tower outlet pipe 31 and the cooling tower inlet pipe 32 to form a circulation loop. The cooling tower outlet pipe 31 is provided with a second water pump 311, a fifth electric valve 312 and a seventh electric valve 313 in sequence. The cooling tower outlet pipe 31 and the cooling tower inlet pipe 32 are also connected through a pipeline and are provided with an eighth electric valve 314. The connection point between the pipeline where the eighth electric valve 314 is located and the cooling tower outlet pipe 31 is located between the fifth electric valve 312 and the seventh electric valve 313. The pipeline where the eighth electric valve 314 is located is connected in parallel with the pipeline where the condenser 2 is located, so as to facilitate the control of the connection and disconnection of the condenser 2.

[0034] The two ends of the cold side channel of the plate heat exchanger 5 are connected to the cooling tower outlet pipe 31 through the heat exchanger primary side water inlet pipe 51 and the heat exchanger primary side water outlet pipe 52 to form a circulation loop. The heat exchanger primary side water inlet pipe 51 is provided with a sixth electric valve 511, and the connection point between the heat exchanger primary side water inlet pipe 51 and the cooling tower outlet pipe 31 is set between the second water pump 311 and the fifth electric valve 312, and the connection point between the heat exchanger primary side water outlet pipe 52 and the cooling tower outlet pipe 31 is set between the fifth electric valve 312 and the seventh electric valve 313, and is set before the connection point between the pipeline where the eighth electric valve 314 is located and the cooling tower outlet pipe 31. The pipeline where the sixth electric valve 511 is located is connected in parallel with the pipeline where the fifth electric valve 312 is located, so as to facilitate the control of the switch of the cold side channel of the plate heat exchanger 5. The two ends of the hot side channel of the plate heat exchanger 5 are connected to the chilled water return pipe 12 through the heat exchanger secondary side water inlet pipe 53 and the heat exchanger secondary side water outlet pipe 54 to form a circulation loop. The heat exchanger secondary side water inlet pipe 53 is provided with a second electric valve 531, and the connection point between the heat exchanger secondary side water inlet pipe 53 and the chilled water return pipe 12 is set between the first water pump 121 and the first electric valve 122, and the connection point between the heat exchanger secondary side water outlet pipe 54 and the chilled water return pipe 12 is set between the first electric valve 122 and the third electric valve 123, and is set before the connection point between the pipeline where the fourth electric valve 124 is located and the chilled water return pipe 12. The pipeline where the second electric valve 531 is located is connected in parallel with the pipeline where the first electric valve 122 is located, so as to facilitate the control of the switch of the hot side channel of the plate heat exchanger 5.

[0035] The circulating cooling unit includes a third water pump 56 and a converging three-way valve 55. The cooling tower outlet pipe 31 and the cooling tower inlet pipe 32 are connected to the converging three-way valve 55 through a pipeline. The A port of the converging three-way valve 55 is connected to the cooling tower outlet pipe 31 through a pipeline. The connection point of the pipeline where the A port of the converging three-way valve 55 is located and the cooling tower outlet pipe 31 is set between the fifth electric valve 312 and the seventh electric valve 313, and is set after the connection point of the pipeline where the eighth electric valve 314 is located and the cooling tower outlet pipe 31. The AB port of the converging three-way valve 55 is also connected to the cooling tower outlet pipe 31 through a pipeline. The pipeline where the AB port of the converging three-way valve 55 is located is also connected to the third water pump 56. The connection point of the pipeline where the AB port of the converging three-way valve 55 is located and the cooling tower outlet pipe 31 is set after the seventh electric valve 313, that is, between the seventh electric valve 313 and the condenser 2. The B port of the converging three-way valve 55 is connected to the cooling tower water inlet pipe 32 through a pipeline, and the connection point between the pipeline where the B port of the converging three-way valve 55 is located and the cooling tower water inlet pipe 32 is arranged before the connection point between the pipeline where the eighth electric valve 314 is located and the cooling tower water inlet pipe 32.

[0036] When the refrigerator is cooling, the first electric valve 122 and the third electric valve 123 on the freezing side are opened, the second electric valve 531 and the fourth electric valve 124 are closed, and the evaporator 1, the chilled water supply pipe 11, the load device 4, the chilled water return pipe 12, and the first water pump 121 form a circulation loop. After the chilled water is cooled by the evaporator 1 under the action of the first water pump 121, it cools the load device 4 along the chilled water supply pipe 11, and then returns to the evaporator 1 along the chilled water return pipe 12 for cooling again. The fifth electric valve 312 and the seventh electric valve 313 on the cooling side are opened, the sixth electric valve 511 and the eighth electric valve 314 are closed, and the cooling tower 3, the cooling tower outlet pipe 31, the second water pump 311, the condenser 2, and the cooling tower inlet pipe 32 form a circulation loop. Under the action of the second water pump 311, the cooling water cools the condenser 2 along the cooling tower outlet pipe 31, and then returns to the cooling tower 3 along the cooling tower inlet pipe 32 to ensure the effective operation of the refrigerator.

[0037] Depend on Figure 2 and Figure 4As shown, when the refrigerator and the plate heat exchanger 5 are used for joint cooling, the second electric valve 531 and the third electric valve 123 on the freezing side are opened, the first electric valve 122 and the fourth electric valve 124 are closed, and the evaporator 1, the chilled water supply pipe 11, the load device 4, the chilled water return pipe 12, the first water pump 121, the heat exchanger secondary side water inlet pipe 53, the plate heat exchanger 5, and the heat exchanger secondary side water outlet pipe 54 form a circulation loop. The chilled water is cooled down on the cold side of the plate heat exchanger 5 by the first water pump 121, and then enters the evaporator 1 along the chilled water return pipe 12. After being cooled again by the evaporator 1, the load device 4 is cooled down along the chilled water supply pipe 11. The sixth electric valve 511 and the eighth electric valve 314 on the cooling side are opened, the fifth electric valve 312 and the seventh electric valve 313 are closed, the B end and the AB end of the converging three-way valve 55 are connected, and the A end and the AB end are closed. The cooling tower 3, the cooling tower outlet pipe 31, the second water pump 311, the heat exchanger primary side water inlet pipe 51, the plate heat exchanger 5, the heat exchanger primary side water outlet pipe 52, and the cooling tower water inlet pipe 32 form a circulation loop. The cooling water enters the plate heat exchanger 5 along the cooling tower outlet pipe 31 and the heat exchanger primary side water inlet pipe 51 under the action of the second water pump 311, cools the chilled water in the heat exchanger secondary side water inlet pipe 53, and then returns to the cooling tower 3 along the heat exchanger primary side water outlet pipe 52 and the cooling tower water inlet pipe 32 to complete the cycle. The condenser 2 and the third water pump 56 form a circulation loop. The water in the pipeline circulates under the action of the third water pump 56 to cool the condenser 2, meet the internal requirements of the refrigerator, and ensure the effective operation of the refrigerator.

[0038] Compared with the existing device, the low-temperature cooling water in the cooling tower 3 does not pass through the condenser 2 but directly returns to the cooling tower 3 along the cooling tower water inlet pipe 32. Therefore, the condenser 2 will not be abnormally shut down or unable to load due to the sudden entry of the low-temperature water in the cooling tower 3, and even the temperature of the data room of the load device 4 will rise due to the unstable operation of the system. When the water temperature in the circulation loop formed by the condenser 2 and the third water pump 56 is too high to cool the condenser 2, adjust the confluence three-way valve 55, close the B end and the AB end of the confluence three-way valve 55 to a certain degree, and open the A end and the AB end to a certain degree, so that the low-temperature cooling water in the cooling tower outlet pipe 31 enters the circulation loop formed by the condenser 2 and the third water pump 56 to cool the condenser 2. When the water temperature in the circulation loop formed by the condenser 2 and the third water pump 56 meets the cooling requirement of the condenser 2, close the A end and the AB end of the confluence three-way valve 55, and fully open the B end and the AB end, and operate normally.

[0039] Depend on Figure 3As shown, when the plate heat exchanger 5 provides cooling for free alone, the first electric valve 122 and the third electric valve 123 on the freezing side are closed, and the second electric valve 531 and the fourth electric valve 124 are opened; the fifth electric valve 312 and the seventh electric valve 313 on the cooling side are closed, the sixth electric valve 511 and the eighth electric valve 314 are opened, the B end and the AB end of the converging three-way valve 55 are connected, and the A end and the AB end are closed. Freezing side: the secondary side water inlet pipe 53 of the heat exchanger, the plate heat exchanger 5, the secondary side water outlet pipe 54 of the heat exchanger, the chilled water return pipe 12, the chilled water supply pipe 11, the load device 4, and the first water pump 121 form a circulation loop. Cooling side: the cooling tower 3, the cooling tower outlet pipe 31, the second water pump 311, the primary side water inlet pipe 51 of the heat exchanger, the plate heat exchanger 5, the primary side water outlet pipe 52 of the heat exchanger, and the cooling tower water inlet pipe 32 form a circulation loop. The cooling water in the cooling tower 3 enters the plate heat exchanger 5 along the cooling tower outlet pipe 31 and the primary side inlet pipe 51 of the heat exchanger under the action of the second water pump 311, cools the chilled water in the secondary side inlet pipe 53 of the heat exchanger, and then returns to the cooling tower 3 along the primary side outlet pipe 52 of the heat exchanger and the cooling tower inlet pipe 32. After the chilled water in the secondary side inlet pipe 53 of the heat exchanger is cooled, it cools the load device 4 along the secondary side outlet pipe 54 of the heat exchanger, the chilled water return pipe 12, and the chilled water supply pipe 11 under the action of the first water pump 121, so that the plate heat exchanger 5 can be cooled independently and free of charge.

[0040] Furthermore, the pipeline where the AB port of the converging three-way valve 55 is located is also connected to a one-way valve 57, which is arranged after the third water pump 56. The one-way valve 57 is opened and closed in accordance with the third water pump. The one-way valve 57 controls the connection and disconnection of the circulation loop between the condenser 2 and the third water pump 56, so as to avoid the cooling water entering the circulation loop formed by the third water pump 56 and the condenser 2 when the plate heat exchanger 5 is cooling alone, causing the third water pump 56 to run idle, thus wasting energy.

[0041] Furthermore, a temperature sensor 321 is provided at one end of the cooling tower water inlet pipe 32 close to the condenser 2, and the temperature sensor 321 is provided before the connection point between the pipe where the B port of the converging three-way valve 55 is located and the cooling tower water inlet pipe 32. The provision of the temperature sensor 321 facilitates the detection of the water temperature in the circulation loop formed by the condenser 2 and the third water pump 56, and controls the switching direction of the converging three-way valve 55, so that the water temperature in the circulation loop formed by the condenser 2 and the third water pump 56 meets the operating requirements of the refrigerator.

[0042] The working process of the present invention is:

[0043] When the outdoor temperature is high and the cooling tower 3 is insufficient to provide cooling to the load device 4, the refrigeration machine provides cooling to the load device 4. At this time, the first electric valve 122 and the third electric valve 123 on the freezing side are opened, the second electric valve 531 and the fourth electric valve 124 are closed, and the evaporator 1, the chilled water supply pipe 11, the load device 4, the chilled water return pipe 12, and the first water pump 121 form a circulation loop. The chilled water is refrigerated by the evaporator 1 under the action of the first water pump 121, and then circulates to cool the load device 4. The fifth electric valve 312 and the seventh electric valve 313 on the cooling side are opened, the sixth electric valve 511 and the eighth electric valve 314 are closed, and at the same time, the one-way valve 57 is closed, the B end and the AB end of the converging three-way valve 55 are connected, and the A end and the AB end are closed, and the cooling tower 3, the cooling tower outlet pipe 31, the second water pump 311, the condenser 2, and the cooling tower inlet pipe 32 form a circulation loop. The cooling water circulates and cools the condenser 2 under the action of the second water pump 311, thereby ensuring the effective operation of the refrigerator.

[0044] When the outdoor temperature decreases and the output water temperature in the cooling tower outlet pipe 31 is lower than the temperature in the chilled water return pipe 12, the first electric valve 122 is closed on the freezing side, the second electric valve 531 is opened, the fifth electric valve 312 and the seventh electric valve 313 are closed on the cooling side, the sixth electric valve 511 and the eighth electric valve 314 are opened, the check valve 57 is opened at the same time, and the third water pump 56 is started. Under the action of the first water pump 121, the chilled water on the freezing side first passes through the plate heat exchanger 5 to be cooled and cooled by the cooling water in the cooling tower 3, and then is cooled by the evaporator 1 to provide cooling to the load device 4. On the cooling side, the cooling tower 3, the cooling tower outlet pipe 31, the second water pump 311, the primary side water inlet pipe 51 of the heat exchanger, the plate heat exchanger 5, the primary side water outlet pipe 52 of the heat exchanger, and the cooling tower water inlet pipe 32 form a circulation loop, and the cooling water in the cooling tower 3 cools and cools the chilled water on the freezing side through the plate heat exchanger 5. In order to ensure the effective operation of the refrigerator, the third water pump 56 and the condenser 2 form a circulation loop through the pipeline to ensure the normal operation of the refrigerator. In this process, when the temperature sensor 321 detects that the water temperature in the circulation loop formed by the condenser 2 and the third water pump 56 is too high to cool the condenser 2, the converging three-way valve 55 is adjusted, the B end and the AB end of the converging three-way valve 55 are closed to a certain degree, and the A end and the AB end are opened to a certain degree, so that the low-temperature cooling water in the cooling tower outlet pipe 31 enters the circulation loop formed by the condenser 2 and the third water pump 56. When the temperature sensor 321 detects that the water temperature in the circulation loop formed by the condenser 2 and the third water pump 56 meets the cooling requirement of the condenser 2, the converging three-way valve 55 is adjusted again, so that the A end of the converging three-way valve 55 is disconnected from the AB end, and the B end is connected to the AB end, and the cooling water circulates to ensure the normal operation of the refrigerator. The third water pump 56 and the confluence three-way valve 55 are provided so that the condenser 2 and the third water pump 56 form an independent circulation loop, and when the refrigeration supply of the refrigeration machine is switched to the combined refrigeration supply of the refrigeration machine and the plate heat exchanger 5, the low-temperature water in the cooling tower 3 will not suddenly enter the condenser 2, causing the refrigeration machine to stop abnormally, unable to load, or even causing the temperature of the data room of the load device 4 to rise, thus achieving a smooth transition from the refrigeration supply of the refrigeration machine to the combined refrigeration supply of the refrigeration machine and the plate heat exchanger 5. In addition, the provision of the third water pump 56 and the confluence three-way valve 55 reduces the head of the second water pump 311, indirectly reducing the energy consumption of the device.

[0045] When the outdoor temperature drops further and the output water temperature in the cooling tower outlet pipe 31 is lower than the water temperature in the chilled water supply pipe 11, the refrigerator is turned off and the entire system operates as usual. When the refrigerator is completely unloaded and shut down, the third electric valve 123 is closed on the freezing side, the fourth electric valve 124 is opened, and the third water pump 56 and the one-way valve 57 are closed on the cooling side, completing the smooth transition from the joint cooling of the refrigerator and the plate heat exchanger 5 to the independent cooling of the plate heat exchanger 5. At this time, the cooling water in the cooling tower 3 is completely used to cool the load device 4, saving energy and reducing consumption, while ensuring the continuous and effective operation of the entire system.

[0046] When the outdoor temperature rises, the output water temperature in the cooling tower outlet pipe 31 is higher than the temperature in the chilled water supply pipe 11 and lower than the temperature in the chilled water return pipe 12, and the cooling water in the cooling tower 3 is insufficient to cool the load device 4 alone. At this time, the fourth electric valve 124 is closed on the freezing side, the third electric valve 123 is opened, the one-way valve 57 and the third water pump 56 are opened on the cooling side, and then the refrigerator is turned on to realize a smooth transition from the plate heat exchanger 5 supplying cooling alone to the refrigerator and the plate heat exchanger 5 supplying cooling together. During the operation of the device, the opening of the converging three-way valve 55 is adjusted according to the normal operation requirements of the refrigerator to meet the cooling requirements of the condenser 2, so that the circulation loop formed by the condenser 2 and the third water pump 56 can operate normally.

[0047] Depend on Figure 5 As shown, when the outdoor temperature rises further and the output water temperature in the cooling tower outlet pipe 31 is not lower than the temperature in the chilled water return pipe 12, the second electric valve 531 is closed on the freezing side, the first electric valve 122 is opened, and the sixth electric valve 511 is closed on the cooling side, and the fifth electric valve 312 is opened. In the process of the system continuing to operate, the converging three-way valve 55 is used to adjust the cooling water temperature in the circulation loop formed by the condenser 2 and the third water pump 56 to ensure the normal operation of the refrigerator. When the output water temperature of the cooling tower 3 meets the cooling requirements of the condenser 2, the eighth electric valve 314, the one-way valve 57 and the third water pump 56 are closed, and the seventh electric valve 313 is opened to realize the final switching from the joint cooling of the refrigerator and the plate heat exchanger 5 to the cooling of the refrigerator alone.

[0048] During the operation of the entire device, each time the transition between different working conditions is switched, the circulating cooling unit is operated to meet the cooling requirements of the condenser 2, so that the low-temperature cooling water in the cooling tower 3 does not pass through the condenser 2 but directly returns to the cooling tower 3 along the cooling tower water inlet pipe 32, so the condenser 2 will not cause the refrigerator to abnormally shut down or be unable to load due to the sudden entry of the low-temperature cooling water in the cooling tower 3, and even cause the temperature of the data room of the load device 4 to rise. The present invention realizes a smooth transition between different working conditions, the refrigerator operates effectively, and has no influence or fluctuation on the temperature of the load device 4, ensuring stable and continuous production, improving production efficiency, and at the same time making full use of the free cold source, maximizing the use time of the free cold source, and reducing production energy consumption.

[0049] In the actual operation process, the use of this technology in the data statistics computer room can bring 25-50% energy savings in winter, reducing production costs for the enterprise.

[0050] In the description of the present invention, it is necessary to understand that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0051] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A multi-cold source conversion device for a data center, characterized in that: It is provided with a refrigerator, a cooling tower, a plate heat exchanger and a load device. The refrigerator includes an evaporator and a condenser. The evaporator can provide cooling to the load device alone. The cooling tower can also provide cooling to the load device alone through the plate heat exchanger. The evaporator can also provide cooling to the load device in conjunction with the plate heat exchanger. The condenser is also provided with a circulating cooling unit, so that the entire system can achieve a smooth transition when switching between cooling by the refrigerator, cooling by the refrigerator and the plate heat exchanger, and free cooling by the plate heat exchanger. The two ends of the evaporator are connected to the load device through a chilled water supply pipe and a chilled water return pipe respectively, and the chilled water return pipe is provided with a first water pump, a first electric valve and a third electric valve in sequence, and the chilled water supply pipe and the chilled water return pipe are also connected to each other through a pipeline to be provided with a fourth electric valve, and the connection point between the pipeline where the fourth electric valve is located and the chilled water return pipe is arranged between the first electric valve and the third electric valve; the cooling tower is connected to the condenser through a cooling tower outlet pipe and a cooling tower inlet pipe, and the cooling tower outlet pipe is provided with a second water pump, a fifth electric valve and a seventh electric valve in sequence, and the cooling tower outlet pipe and the cooling tower inlet pipe are also connected to each other through a pipeline to be provided with an eighth electric valve, and the connection point between the pipeline where the eighth electric valve is located and the cooling tower outlet pipe is arranged between the fifth electric valve and the seventh electric valve; The two ends of the cold side channel of the plate heat exchanger are connected to the cooling tower outlet pipe through the primary side water inlet pipe of the heat exchanger and the primary side water outlet pipe of the heat exchanger, respectively. The primary side water inlet pipe of the heat exchanger is provided with a sixth electric valve. The connection point between the primary side water inlet pipe of the heat exchanger and the cooling tower outlet pipe is arranged between the second water pump and the fifth electric valve, and the connection point between the primary side water outlet pipe of the heat exchanger and the cooling tower outlet pipe is arranged between the fifth electric valve and the seventh electric valve; the two ends of the hot side channel of the plate heat exchanger are connected to the chilled water return pipe through the secondary side water inlet pipe of the heat exchanger and the secondary side water outlet pipe of the heat exchanger, respectively. The secondary side water inlet pipe of the heat exchanger is provided with a second electric valve. The connection point between the secondary side water inlet pipe of the heat exchanger and the chilled water return pipe is arranged between the first water pump and the first electric valve, and the connection point between the secondary side water outlet pipe of the heat exchanger and the chilled water return pipe is arranged between the first electric valve and the third electric valve; The circulating cooling unit includes a third water pump and a converging three-way valve. The cooling tower outlet pipe and the cooling tower inlet pipe are connected to the converging three-way valve through a pipeline. The A port of the converging three-way valve is connected to the cooling tower outlet pipe through a pipeline. The connection point of the pipeline where the A port of the converging three-way valve is located and the cooling tower outlet pipe is arranged between the fifth electric valve and the seventh electric valve, and is arranged after the connection point where the pipeline where the eighth electric valve is located and the cooling tower outlet pipe is connected. The AB port of the converging three-way valve is connected to the cooling tower outlet pipe. The outlet of the converging three-way valve is also connected with the cooling tower outlet pipe through a pipeline, the pipeline where the AB port of the converging three-way valve is located is also connected with the third water pump, the connection point between the pipeline where the AB port of the converging three-way valve is located and the cooling tower outlet pipe is arranged after the seventh electric valve, and the B port of the converging three-way valve is connected with the cooling tower inlet pipe through a pipeline, and the connection point between the pipeline where the B port of the converging three-way valve is located and the cooling tower inlet pipe is arranged before the connection point between the pipeline where the eighth electric valve is located and the cooling tower inlet pipe.

2. A data center multi-cold source conversion device according to claim 1, characterized in that: When the refrigerator provides cooling, the evaporator, the chilled water supply pipe, the load device, the chilled water return pipe, and the first water pump form a circulation loop; the cooling tower, the cooling tower outlet pipe, the second water pump, the condenser, and the cooling tower inlet pipe form a circulation loop.

3. A data center multi-cold source conversion device according to claim 2, characterized in that: When the refrigerator and the plate heat exchanger jointly provide cooling, the evaporator, the chilled water supply pipe, the load device, the chilled water return pipe, the first water pump, and the plate heat exchanger form a circulation loop; the cooling tower, the cooling tower outlet pipe, the second water pump, the plate heat exchanger, and the cooling tower inlet pipe form a circulation loop; the condenser and the third water pump form a circulation loop.

4. A data center multi-cold source conversion device according to claim 1, characterized in that: When the plate heat exchanger provides cooling for free, the plate heat exchanger, the chilled water return pipe, the chilled water supply pipe, the load device, and the first water pump form a circulation loop; the cooling tower, the cooling tower outlet pipe, the second water pump, the plate heat exchanger, and the cooling tower inlet pipe form a circulation loop.

5. A data center multi-cold source conversion device according to claim 1, characterized in that: The pipeline where the AB port of the converging three-way valve is located is also connected to a one-way valve, and the one-way valve is arranged after the third water pump.

6. A data center multi-cold source conversion device according to claim 1, characterized in that: A temperature sensor is also provided at one end of the cooling tower water inlet pipe close to the condenser, and the temperature sensor is arranged before the connection point between the pipeline where the B port of the converging three-way valve is located and the cooling tower water inlet pipe.

7. A control method for switching multiple cold sources in a data center, characterized in that: The data center multi-cold source conversion device described in any one of claims 1 to 6 is used to control the smooth conversion between the cooling supplies of multiple cold sources in the data center.

8. A control method for switching multiple cold sources in a data center according to claim 7, characterized in that: When the cooling supply from the refrigerator is switched to the combined cooling supply of the refrigerator and the plate heat exchanger, the first electric valve and the fourth electric valve are closed on the freezing side, and the second electric valve and the third electric valve are opened; the fifth electric valve and the seventh electric valve are closed on the cooling side, and the sixth electric valve and the eighth electric valve are opened, and the one-way valve is opened at the same time, and the third water pump is started; under the action of the first water pump, the chilled water is first cooled and cooled by the plate heat exchanger, and then cooled by the evaporator to cool the load device; and on the cooling side, the cooling tower, the cooling tower outlet pipe, the second water pump, the primary side inlet pipe of the heat exchanger, the plate heat exchanger, the primary side outlet pipe of the heat exchanger, and the cooling tower inlet pipe form a circulation loop, and the cooling water in the cooling tower cools and cools the chilled water on the freezing side through the plate heat exchanger; the third water pump and the condenser form a circulation loop through the pipeline to ensure the normal operation of the refrigerator; When switching from combined cooling to plate heat exchanger cooling alone, shut down the refrigerator until it is completely shut down, close the third electric valve, open the fourth electric valve, close the third water pump and the one-way valve, and complete the smooth transition from combined cooling of the refrigerator and plate heat exchanger to cooling alone of the plate heat exchanger; When switching from single cooling by plate heat exchanger to combined cooling, the fourth electric valve is closed on the freezing side, the third electric valve is opened, the one-way valve and the third water pump are opened on the cooling side, and then the refrigerator is turned on to realize smooth transition from single cooling by plate heat exchanger to combined cooling by refrigerator and plate heat exchanger; When switching from joint cooling to cooling by the chiller alone, the second electric valve is closed on the freezing side and the first electric valve is opened; the sixth electric valve is closed on the cooling side and the fifth electric valve is opened; when the output water temperature of the cooling tower rises to meet the cooling requirements of the condenser, the eighth electric valve, the one-way valve and the third water pump are closed, and the seventh electric valve is opened to realize the switching from joint cooling by the chiller and the plate heat exchanger to cooling by the chiller alone; During the whole process, in order to meet the cooling requirements of the condenser, the opening of the converging three-way valve can be adjusted to adjust the water temperature in the circulation loop formed by the third water pump and the condenser to ensure the normal operation of the refrigerator.

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