Centralized liquid cooling system

Abstract

The embodiment of the utility model provides a centralized liquid cooling system, and belongs to the field of liquid cooling. The system comprises a refrigerating system which comprises a transverse flow cooling tower and a plate heat exchanger which are communicated through double pipelines, the plate heat exchanger is communicated with an energy storage battery cabin through double pipelines, and the refrigerating system is used for preparing cooling water and releasing cold when the energy storage battery cabin is charged and discharged; the water replenishing system comprises a water softener, a water tank and variable-frequency water supply equipment, one end of the water softener is connected with a tap water pipe, the other end of the water softener is connected with a water inlet of the water tank, a water outlet of the water tank is connected with one end of the variable-frequency water supply equipment, and the other end of the variable-frequency water supply equipment is connected with a water inlet of the plate heat exchanger; the PLC control system is used for controlling starting and stopping of the refrigerating system and the water supplementing system. The system is simple in design, and compared with a cold supply system in the prior art that a cooling tower, a cold storage facility, a plate heat exchanger and a refrigerating machine are connected in parallel to supply cold and store cold at the same time, the problem of energy waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid cooling systems, in particular to a centralized liquid cooling system. Background Art

[0002] Energy storage batteries will continue to generate heat during operation, and cooling is an important factor affecting the safety of energy storage power stations. At present, there are two mainstream thermal management methods for lithium battery units, air cooling and liquid cooling. Air cooling and liquid cooling each have their own characteristics. Compared with liquid cooling, liquid cooling and air cooling have the inherent characteristics of large heat load, low flow resistance, and high heat exchange efficiency. They are widely used in places where the battery pack has high energy density, fast charging and discharging speed, and large changes in ambient temperature.

[0003] Although the air cooling system has the advantages of small initial investment, low maintenance cost and easy maintenance, it is more suitable for small civilian or commercial battery thermal management. Liquid cooling has gradually become the mainstream battery cooling method in large-capacity and high-energy-ratio fields such as large ground power stations. Liquid cooling systems can take away heat better than air cooling systems.

[0004] The current cooling systems are all in the form of cooling towers, cold storage facilities plus plate heat exchangers and refrigeration machines in parallel to provide cooling and store cold. This cooling system has the following defects: when the energy storage battery is charged and discharged for a short time, the heat it generates is low, and it only needs to be simply released. The current cooling system not only has a complex pipeline design, but also causes unnecessary energy waste. Utility Model Content

[0005] The purpose of the embodiment of the utility model is to provide a centralized liquid cooling system, which has a relatively simple design and only uses a cooling tower and a plate heat exchanger to prepare cooling water, thereby avoiding the problem of energy waste.

[0006] In order to achieve the above objectives, the present invention provides a centralized liquid cooling system, including:

[0007] A refrigeration system, the refrigeration system comprising a cross-flow cooling tower and a plate heat exchanger, wherein the cross-flow cooling tower is connected to the plate heat exchanger through a double pipeline, and the plate heat exchanger is connected to the energy storage battery compartment through a double pipeline, and the refrigeration system is used to prepare cooling water and release cooling when the energy storage battery compartment is charged and discharged;

[0008] A water replenishment system, the water replenishment system comprising a water softener, a water tank and a variable frequency water supply device, wherein one end of the water softener is connected to a tap water pipe, and the other end is connected to a water inlet of the water tank, a water outlet of the water tank is connected to one end of the variable frequency water supply device, and the other end of the variable frequency water supply device is connected to a water inlet of the plate heat exchanger; and

[0009] A PLC control system is connected to the refrigeration system and the water supply system, and is used to control the start and stop of the refrigeration system and the water supply system.

[0010] Optionally, the refrigeration system further comprises:

[0011] a refrigeration circulation water pump, the refrigeration circulation water pump being arranged between the cross-flow cooling tower and the plate heat exchanger, and being used for transmitting the cooling water cooled by the cross-flow cooling tower to the plate heat exchanger for cooling; and

[0012] A cooling circulation water pump is arranged between the plate heat exchanger and the energy storage battery compartment, and is used to transmit return water from the energy storage battery compartment to the plate heat exchanger for return water cooling.

[0013] Optionally, the centralized liquid cooling system is further provided with a water treatment unit, which is arranged between the cross-flow cooling tower and the refrigeration circulation water pump, and is used for filtering and removing dirt from the cooling water after being cooled by the cross-flow cooling tower, and then transmitting the water to the plate heat exchanger via the refrigeration circulation water pump.

[0014] Optionally, the refrigeration circulation water pump and the cooling circulation water pump are regulated by variable frequency regulation.

[0015] Optionally, the centralized liquid cooling system is further provided with a decontaminator, which is arranged between the energy storage battery compartment and the plate heat exchanger, and is used to decontaminate the return water flowing out of the energy storage battery compartment when it enters the refrigeration system for cooling.

[0016] Optionally, the cross-flow cooling tower is provided with a plurality of fans;

[0017] The PLC controller is also used to control the operating frequency of multiple fans of the cross-flow cooling tower according to the difference between the outlet water temperature of the cooling water and the wet bulb temperature of the air.

[0018] Through the above technical scheme, a cross-flow cooling tower and a plate heat exchanger are used to prepare cooling water and then release the cold to the energy storage battery compartment. The design is simple, and compared with the existing technology, the cooling system adopts a cooling tower, a cold storage facility plus a plate heat exchanger and a refrigeration machine in parallel to supply and store cold, which avoids the problem of energy waste.

[0019] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of a centralized liquid cooling system provided by an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the positions of a refrigeration circulation water pump and a cooling circulation water pump provided by an embodiment of the utility model;

[0023] Figure 3 It is a detailed structural diagram of a centralized liquid cooling system provided by an embodiment of the utility model.

[0024] Description of Reference Numerals

[0025] 10 Refrigeration System 100 Cross Flow Cooling Tower

[0026] 101 Plate heat exchanger 102 Refrigeration circulating water pump

[0027] 103 Cooling circulation water pump 11 Water supply system

[0028] 110 water softener 111 water tank

[0029] 112 variable frequency water supply equipment 12 PLC control system

[0030] 13Energy storage battery compartment 14Water treatment unit

[0031] 15. Decontamination Device DETAILED DESCRIPTION

[0032] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0033] See also Figure 1 FIG. 1 is a schematic diagram of a centralized liquid cooling system provided by an embodiment of the utility model, and the centralized liquid cooling system includes:

[0034] A refrigeration system 10, wherein the refrigeration system 10 comprises a cross-flow cooling tower 100 and a plate heat exchanger 101, wherein the cross-flow cooling tower 100 is connected to the plate heat exchanger 101 through a double pipeline, and the plate heat exchanger 101 is connected to the energy storage battery compartment 13 through a double pipeline, and the refrigeration system 10 is used to prepare cooling water, and release cooling when the energy storage battery compartment 13 is charged and discharged;

[0035] A water replenishment system 11, the water replenishment system 11 comprises a water softener 110, a water tank 111 and a variable frequency water supply device 112, wherein one end of the water softener 110 is connected to a tap water pipe, and the other end is connected to a water inlet of the water tank 111, a water outlet of the water tank 111 is connected to one end of the variable frequency water supply device 112, and the other end of the variable frequency water supply device 112 is connected to a water inlet of the plate heat exchanger 101; and

[0036] The PLC control system 12 is connected to the refrigeration system 10 and the water replenishment system 11 and is used to control the start and stop of the refrigeration system 10 and the water replenishment system 11.

[0037] Preferably, the constant pressure value of the water replenishment system 11 is set to 0.12 MPa.

[0038] In some embodiments, see Figure 2 As shown, the refrigeration system 10 is further provided with:

[0039] A refrigeration circulation water pump 102, which is disposed between the cross-flow cooling tower 100 and the plate heat exchanger 101 and is used to transfer cooling water cooled by the cross-flow cooling tower 100 to the plate heat exchanger 101 for cooling; and

[0040] The cooling circulation water pump 103 is disposed between the plate heat exchanger 101 and the energy storage battery compartment 13 and is used to transfer return water from the energy storage battery compartment 13 to the plate heat exchanger 101 for return water cooling.

[0041] In some embodiments, the variable flow control of the refrigeration circulation water pump and the cooling circulation water pump is as follows:

[0042] Calculate the running percentage of the water pump flow rate according to the load change at the end of the air-conditioning system, and compare the change in the temperature difference between the inlet and outlet of the chiller to achieve the mutual reference of multiple parameters to automatically control the running frequency of the water pump, save the energy consumption of hydraulic transmission, and ensure that the temperature difference between the supply and return water is not greater than the design value. Variable flow control of cooling circulation water pump: Calculate the running percentage of the water pump flow rate according to the load change at the end of the air-conditioning system, and compare the change in the temperature difference between the inlet and outlet of the chiller to achieve the mutual reference of the two values ​​to automatically control the running frequency of the water pump, save the energy consumption of hydraulic transmission, and ensure that the temperature difference between the supply and return water is not greater than the design value.

[0043] In some embodiments, see Figure 3 As shown, the centralized liquid cooling system is also provided with a water treatment device 14, which is arranged between the cross-flow cooling tower 100 and the refrigeration circulation water pump 102, and is used to filter and remove pollutants from the cooling water after the cross-flow cooling tower 100 is cooled, and then transmit it to the plate heat exchanger 101 through the refrigeration circulation water pump 102.

[0044] In some implementations, the refrigeration circulation water pump and the cooling circulation water pump are regulated by variable frequency regulation.

[0045] In some embodiments, see Figure 3 As shown, the centralized liquid cooling system is further provided with a decontaminator 15, which is arranged between the energy storage battery compartment 13 and the plate heat exchanger 101, and is used to decontaminate the return water flowing out of the energy storage battery compartment 13 when entering the refrigeration system 10 for cooling.

[0046] In some embodiments, the crossflow cooling tower 100 is provided with a plurality of fans, and the PLC controller 12 is further used to control the operating frequency of the plurality of fans of the crossflow cooling tower 100 according to the difference between the outlet water temperature of the cooling water and the wet bulb temperature of the air.

[0047] In some embodiments, the centralized liquid cooling system further includes a power distribution system, wherein:

[0048] The power load level of this application is secondary load, and it adopts 220V / 380V, 50Hz three-phase five-wire power supply. The power supply is drawn from the substation. The two high-voltage power supplies introduced in the substation can each bear all the secondary loads, and the power supply adopts radial power supply. Metering method: unified metering at the low-voltage distribution cabinet after the transformer. A multifunctional metering instrument with remote transmission function should be installed at the switch of the low-voltage distribution cabinet. Reactive compensation and harmonic filtering devices are installed at the low-voltage distribution cabinet after the transformer. Lightning protection and grounding design: According to the third type of lightning protection design, the lightning protection device meets the requirements of protection against direct lightning, lightning induction, lightning waves, and electromagnetic pulses, and a total equipotential connection is set. The grounding form of the low-voltage distribution system adopts the TN-S system. The PE line and the N line should be strictly separated. The grounding electrodes of the metal casings of all electrical equipment that are not energized under normal circumstances but present voltage after the insulation is damaged are required to be reliably connected to the protective conductor.

[0049] In some embodiments, a local equipotential terminal box is provided in the refrigeration room, which is reliably connected to the reserved grounding terminal of the building. The grounding system is set up using the local equipotential terminal box, and galvanized flat steel is used to reliably connect with the housing of the distribution equipment, the basic channel steel of the distribution cabinet, the protection trunk line, the metal base of the water pump, the electric valve, the metal main pipe for the equipment to enter and exit the household, the metal components of the building, etc., and the grounding resistance is not greater than 1Ω. All socket circuits are equipped with a 30mA leakage protection device. For the ground fault protection of the TN system distribution line with a nominal voltage of 220V between the phase conductors, the time to cut off the fault circuit should meet the following requirements: for the distribution line or the terminal line that only supplies electricity to fixed electrical equipment, it should not exceed 5s; for the terminal line or socket circuit that supplies electricity to handheld electrical equipment or mobile electrical equipment, it should not exceed 0.4s. In order to prevent lightning surge intrusion, a surge protector of level I test is installed at the entrance and exit of the cable to the building.

[0050] In some embodiments, the centralized liquid cooling system is further provided with a monitoring system, which monitors the refrigeration room system for the purpose of meeting the requirements of efficient operation, dynamic efficiency evaluation and control of the system. Relevant monitoring points, sensors and instruments are added according to different control optimization strategies and requirements, which basically include but are not limited to the following monitoring contents:

[0051] 1) Monitoring content of the cooling source self-controlled system for the computer room:

[0052] The temperature of the water supply and return main pipe at the end of the user side, in °C, the measurement point is located on the water supply and return main pipe on the user side (located on the side of the energy storage battery);

[0053] Pressure difference of water supply and return main pipe at the end of user side, unit: kPa, the measurement point is located at water supply and return main pipe at user side;

[0054] The flow rate of the water supply and return main at the end of the user side, in t / h, with the measurement point located at the water supply and return main at the user side;

[0055] Total power consumption of the entire air-conditioning room system, in kWh, instantaneous, daily, monthly and annual cumulative values;

[0056] The operating frequency of each water pump, in Hz;

[0057] 2) Monitoring content of cross flow cooling tower:

[0058] Cooling water supply main temperature, unit: °C;

[0059] Cooling water return main temperature, unit: °C;

[0060] The power consumption of each cross-flow cooling tower fan, in kWh, instantaneous, daily, monthly and annual cumulative values;

[0061] The operating frequency of each cross-flow cooling tower fan, in HZ;

[0062] Outdoor dry bulb temperature and wet bulb temperature, unit ℃, measure the air parameters around the cooling tower, measure the air parameters around the cooling tower.

[0063] 3) Monitoring contents of the automatic control cabinet of the refrigeration / cooling water pump system:

[0064] The power consumption of each water pump, in kWh, instantaneous, daily, monthly and annual cumulative values; the operating frequency of each water pump, in HZ.

[0065] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A centralized liquid cooling system, characterized in that: include: A refrigeration system, the refrigeration system comprising a cross-flow cooling tower and a plate heat exchanger, wherein the cross-flow cooling tower is connected to the plate heat exchanger through a double pipeline, and the plate heat exchanger is connected to the energy storage battery compartment through a double pipeline, and the refrigeration system is used to prepare cooling water and release cooling when the energy storage battery compartment is charged and discharged; A water replenishment system, the water replenishment system comprising a water softener, a water tank and a variable frequency water supply device, wherein one end of the water softener is connected to a tap water pipe, and the other end is connected to a water inlet of the water tank, a water outlet of the water tank is connected to one end of the variable frequency water supply device, and the other end of the variable frequency water supply device is connected to a water inlet of the plate heat exchanger; and A PLC control system is connected to the refrigeration system and the water supply system, and is used to control the start and stop of the refrigeration system and the water supply system.

2. The centralized liquid cooling system according to claim 1, characterized in that: The refrigeration system also includes: A refrigeration circulation water pump, which is arranged between the cross-flow cooling tower and the plate heat exchanger, and is used to transfer the cooling water cooled by the cross-flow cooling tower to the plate heat exchanger for cooling; as well as A cooling circulation water pump is arranged between the plate heat exchanger and the energy storage battery compartment, and is used to transmit return water from the energy storage battery compartment to the plate heat exchanger for return water cooling.

3. The centralized liquid cooling system according to claim 2, characterized in that: The centralized liquid cooling system is also provided with a water treatment device, which is arranged between the cross-flow cooling tower and the refrigeration circulation water pump, and is used to filter and remove dirt from the cooling water after being cooled by the cross-flow cooling tower, and then transmit it to the plate heat exchanger through the refrigeration circulation water pump.

4. The centralized liquid cooling system according to claim 2, characterized in that: The refrigeration circulation water pump and the cooling circulation water pump are regulated by variable frequency regulation.

5. The centralized liquid cooling system according to claim 1, characterized in that: The centralized liquid cooling system is also provided with a decontaminator, which is arranged between the energy storage battery compartment and the plate heat exchanger, and is used to decontaminate the return water flowing out of the energy storage battery compartment when it enters the refrigeration system for cooling.

6. The centralized liquid cooling system according to claim 1, characterized in that: The cross-flow cooling tower is provided with a plurality of fans; The PLC control system is also used to control the operating frequency of multiple fans of the cross-flow cooling tower according to the difference between the outlet water temperature of the cooling water and the wet bulb temperature of the air.

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