Cold storage device, refrigeration system, control method thereof, and storage medium

Abstract

A cold storage device (2), a refrigeration system (1), a control method thereof, and a storage medium. In a cold charging mode, a first refrigeration circuit and a second refrigeration circuit operate independently, and the liquid outlet (A22) of the evaporator (212) of the second cold machine (21) charges cold to the liquid inlet (A31) of the cold storage tank (22). By controlling a valve body assembly (5), liquid at the liquid outlet (A72) of the terminal device (4) and liquid at the liquid outlet (A12) of the condenser (211) of the second cold machine (21) are mixed and then provided to the liquid inlet (A71) of the terminal device (4) via the evaporator (311) of the first cold machine (31). , and is provided to the liquid inlet (A11) of the condenser (211) of the second cold machine (21); in the cooling mode, by controlling the valve body assembly (5), the liquid at the liquid outlet (A72) of the terminal device (4) and the liquid at the liquid outlet (A32) of the cold storage tank (22) are mixed, and then provided to the liquid inlet (A71) of the terminal device (4) through the evaporator (311) of the first cold machine (31), and is provided to the liquid inlet (A11) of the condenser (211) of the second cold machine (21) through the valve body assembly (5).

Description

Technical Field

[0001] The present invention relates to the technical field of data center refrigeration, and in particular to a cold storage device, a refrigeration system, a control method thereof, and a storage medium. Background Art

[0002] With the continuous development of the big data era, the computing and processing requirements of data center servers are constantly increasing, resulting in an increase in the heat generated by the servers. It is necessary to continuously supply cooling to the servers to ensure their normal operation. When the mains power outage occurs, the refrigeration system shuts down. Although the refrigeration system can be restarted by the backup generator at this time, it takes a certain amount of startup time for the refrigeration system to start up and supply cooling normally. If the server is not continuously supplied with cooling during this time, the server will shut down due to the over-high operating temperature of the internal electronic components.

[0003] In large-scale chilled water systems in data centers, cold storage technology is primarily used to achieve continuous cooling. Uptime's requirements for T4-rated data centers explicitly mandate continuous cooling; other specifications and standards lack explicit and specific requirements for this function. However, for data centers that need to ensure the cooling system provides adequate cooling during unplanned power outages, installing a cold storage system is a technically feasible and economical option.

[0004] Because data centers consume significant amounts of electricity, with the cooling system accounting for approximately 60% of the total annual power consumption, effectively reducing the operating costs of the cooling system offers significant economic benefits. Currently, the industry uses cold storage tanks in data centers for peak load shaving and valley filling. However, in practice, this is often limited by the tank's volume, with the storage capacity configured to meet the heat load and duration of continuous cooling. Peak load shaving is uneconomical because the tank's liquid temperature is aligned with the chilled water system's supply temperature, resulting in a large tank and reduced floor space. Furthermore, to ensure the required cold storage capacity for continuous cooling, even with peak load shaving, the available cooling capacity is limited. Summary of the Invention

[0005] In view of this, the present invention provides a cold storage device, a refrigeration system, a control method thereof, and a storage medium.

[0006] In a first aspect, an embodiment of the present invention provides a cold storage device, which is used in a refrigeration system having a cold source system and a terminal device, wherein the cold source system includes a first cold machine, the terminal device is used to cool the load, and the cold storage device includes a second cold machine and a cold storage tank, the evaporator of the first cold machine and the condenser of the second cold machine are connected through a valve body assembly and are used to form a first refrigeration circuit with the terminal device, and the evaporator of the second cold machine and the cold storage tank are used to form a second refrigeration circuit; in the cold charging mode, the first refrigeration circuit and the second refrigeration circuit operate independently, the liquid outlet of the evaporator of the second cold machine charges cold to the liquid inlet of the cold storage tank, and the The liquid outlet of the cold storage tank is provided to the liquid inlet of the evaporator of the second cold machine. By controlling the valve body assembly, the liquid at the liquid outlet of the terminal device is mixed with the liquid at the liquid outlet of the condenser of the second cold machine, and then provided to the liquid inlet of the terminal device via the evaporator of the first cold machine, as well as to the liquid inlet of the condenser of the second cold machine; in the cooling mode, the valve body assembly is controlled so that the liquid at the liquid outlet of the terminal device and the liquid at the liquid outlet of the cold storage tank are mixed, and then provided to the liquid inlet of the terminal device via the evaporator of the first cold machine, as well as to the liquid inlet of the condenser of the second cold machine via the valve body assembly.

[0007] In one embodiment, the valve body assembly includes a first three-way valve assembly and a second three-way valve assembly, the liquid inlet end of the cold storage tank is connected to the liquid outlet end of the evaporator of the second cold machine and the first port connected to the first three-way valve assembly, the liquid outlet end of the cold storage tank is connected to the liquid inlet end of the evaporator of the second cold machine and the first port connected to the second three-way valve assembly, the second port of the first three-way valve assembly is connected to the liquid inlet end of the condenser of the second cold machine, the third port of the first three-way valve assembly is connected to the liquid outlet end of the evaporator of the first cold machine, the second port of the second three-way valve assembly is connected to the liquid outlet end of the condenser of the second cold machine, and the third port of the second three-way valve assembly is connected to the liquid inlet end of the evaporator of the first cold machine; in the cold charging mode, the outlet end of the evaporator of the second cold machine is connected to the liquid outlet end of the condenser of the second cold machine, and the third port of the second three-way valve assembly is connected to the liquid inlet end of the evaporator of the first cold machine. The liquid end is charged with cold to the liquid inlet end of the cold storage tank, and the liquid at the liquid outlet end of the cold storage tank is provided to the liquid inlet end of the evaporator of the second cold machine, and the liquid at the liquid outlet end of the evaporator of the first cold machine is provided to the liquid inlet end of the condenser of the second cold machine through the first three-way valve assembly, and the liquid at the liquid outlet end of the condenser of the second cold machine is mixed with the liquid at the liquid outlet end of the terminal device after passing through the second three-way valve assembly and provided to the liquid inlet end of the evaporator of the first cold machine; in the cooling mode, the liquid at the liquid outlet end of the cold storage tank is mixed with the liquid at the liquid outlet end of the terminal device after passing through the second three-way valve assembly and provided to the liquid inlet end of the evaporator of the first cold machine, and the liquid at the liquid outlet end of the evaporator of the first cold machine is provided to the liquid inlet end of the cold storage tank through the first three-way valve assembly.

[0008] In one embodiment, the refrigeration system further includes a controller, which is electrically connected to the valve body assembly. The cooling mode includes a peak-shaving cooling mode and a continuous cooling mode. During the peak power period, when the liquid temperature of the cold storage tank is lower than a first set value, the controller controls the refrigeration system to enter the peak-shaving cooling mode. The controller controls the valve opening of the second three-way valve assembly according to the liquid temperature of the liquid outlet of the terminal device and the liquid temperature of the liquid outlet of the cold storage tank so that the temperature of the liquid inlet of the evaporator of the first cold machine is a second set value, and the temperature of the liquid outlet of the evaporator of the first cold machine is a third set value lower than the second set value, and the third set value is higher than the first set value. value and is equal to the liquid temperature value of the liquid at the liquid inlet end of the terminal device; when the first cold machine and the second cold machine are both in the off state, and the liquid temperature of the cold storage tank is lower than the liquid temperature value of the liquid at the liquid inlet end of the terminal device, the controller controls the refrigeration system to enter the continuous cooling mode, and the controller controls the valve opening of the second three-way valve assembly according to the liquid temperature of the liquid outlet end of the terminal device and the liquid temperature of the liquid outlet end of the cold storage tank so that the temperature of the liquid inlet end of the evaporator of the first cold machine is equal to the liquid temperature value of the liquid inlet end of the terminal device; during the off-peak period, when the liquid temperature of the cold storage tank is lower than the preset temperature value, the controller controls the refrigeration system to enter the cold charging mode.

[0009] In one embodiment, the controller also obtains the clippable peak power of the cold source system, and controls the valve opening of the second three-way valve assembly and the operating power of the cold source system according to the clippable peak power of the cold source system, the liquid temperature at the liquid outlet of the terminal device, and the liquid temperature at the liquid outlet of the cold storage tank, so that the temperature at the liquid inlet of the evaporator of the first cold machine is the second set value.

[0010] In one embodiment, the valve body assembly includes a first three-way valve assembly and a second three-way valve assembly, and the cold storage device also includes a heat exchanger having a first heat exchange branch and a second heat exchange branch, the first heat exchange branch and the second heat exchange branch are arranged relative to each other and are used to exchange heat with each other, the first heat exchange branch is connected in series with the cold storage tank and the evaporator of the second cold machine and is located in the first refrigeration circuit; the liquid outlet end of the second heat exchange branch is connected to the first port of the second three-way valve assembly, the second port of the second three-way valve assembly is connected to the liquid outlet end of the condenser of the second cold machine, and the third port of the second three-way valve assembly is connected to the liquid inlet end of the evaporator of the first cold machine, the first port of the first three-way valve assembly is connected to the second heat exchange branch, the second port of the first three-way valve assembly is connected to the liquid inlet end of the condenser of the second cold machine, and the third port of the first three-way valve assembly is connected to the liquid outlet end of the evaporator of the first cold machine. In the cold charging mode, the liquid outlet end of the evaporator of the second cold machine is connected to the liquid inlet end of the cold storage tank. In the cooling mode, the liquid at the liquid outlet of the cold storage tank is provided to the liquid inlet of the evaporator of the second cold machine via the first heat exchange branch, the liquid at the liquid outlet of the evaporator of the first cold machine is provided to the liquid inlet of the terminal device and to the liquid inlet of the condenser of the second cold machine via the first three-way valve assembly, the liquid at the liquid outlet of the condenser of the second cold machine is mixed with the liquid at the liquid outlet of the terminal device after passing through the second three-way valve assembly, and is provided to the liquid inlet of the evaporator of the first cold machine; in the cooling mode, the liquid at the liquid outlet of the cold storage tank is provided to the liquid inlet of the evaporator of the second cold machine via the first heat exchange branch, the liquid in the second heat exchange branch is heat exchanged with the liquid in the first heat exchange branch, is mixed with the liquid at the liquid outlet of the terminal device through the second three-way valve assembly, and then is provided to the liquid inlet of the condenser of the second cold machine via the evaporator of the first cold machine, and flows into the second heat exchange branch via the first three-way valve assembly, thereby being provided to the liquid inlet of the condenser of the second cold machine.

[0011] In one embodiment, the refrigeration system further includes a controller, which is electrically connected to the valve body assembly. The cooling mode includes a peak-shaving cooling mode and a continuous cooling mode. During the peak power period, when the liquid temperature at the liquid outlet of the second heat exchange branch is lower than a first set value, the controller controls the refrigeration system to enter the peak-shaving cooling mode. The controller controls the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet of the terminal device and the liquid temperature at the liquid outlet of the second heat exchange branch so that the temperature of the liquid inlet of the evaporator of the first cold machine is the second set value, and the temperature of the liquid outlet of the evaporator of the first cold machine is the third set value lower than the second set value, and the third set value is higher than the first set value. and is equal to the liquid temperature value at the liquid inlet end of the terminal device; when the first cold machine and the second cold machine are both in the closed state, and the liquid temperature at the liquid outlet end of the second heat exchange branch is lower than the liquid temperature value at the liquid inlet end of the terminal device, the controller controls the refrigeration system to enter the continuous cooling mode, and the controller controls the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet end of the terminal device and the liquid temperature at the liquid outlet end of the second heat exchange branch so that the temperature at the liquid inlet end of the evaporator of the first cold machine is equal to the liquid temperature value at the liquid inlet end of the terminal device; during the off-peak period, when the liquid temperature of the cold storage tank is lower than the preset temperature value, the controller controls the refrigeration system to enter the cold charging mode.

[0012] In one embodiment, the controller also obtains the clippable peak power of the cold source system, and controls the valve opening of the second three-way valve assembly and the operating power of the cold source system according to the clippable peak power of the cold source system, the liquid temperature at the liquid outlet of the terminal device, and the liquid temperature at the liquid outlet of the second heat exchange branch, so that the temperature at the liquid inlet of the evaporator of the first cold machine is the second set value.

[0013] In one embodiment, the refrigeration system further includes a first pump unit and a second pump unit, wherein the first pump unit is connected to the first refrigeration circuit for driving the flow of liquid in the first refrigeration circuit, and the second pump unit is connected to the second refrigeration circuit for driving the flow of liquid in the second refrigeration circuit.

[0014] In one embodiment, the first cold machine is an air-cooled cold machine, and further includes a fan for dissipating heat from the condenser of the first cold machine; or, the first cold machine is a liquid-cooled cold machine, and the cold source system further includes a third pump unit and a cooling tower, and the cooling tower, the condenser of the first cold machine, and the third pump unit constitute a cooling branch.

[0015] In one embodiment, the refrigeration system includes multiple terminal devices, multiple cold source systems, and multiple cold storage devices. The liquid inlets of the multiple cold source systems are respectively connected to the first liquid loop, the liquid outlets of the multiple terminal devices are respectively connected to the first liquid loop, the liquid outlets of the multiple cold source systems are respectively connected to the second liquid loop, and the liquid inlets of the multiple terminal devices are respectively connected to the second liquid loop.

[0016] In one embodiment, a plurality of the cold storage devices are arranged in a cold source area close to the cold source system, and a plurality of the cold storage devices are arranged in one or more load areas close to the plurality of the terminal devices. Under the control of the controller, the plurality of the cold storage devices in the cold source area are allowed to run the peak shaving cooling mode and / or the continuous cooling mode, and the plurality of the cold storage devices in the load area only run the continuous cooling mode.

[0017] In one embodiment, the load area includes a first load area and a second load area, a first part of the plurality of terminal devices is arranged in the first load area, and a second part of the plurality of terminal devices is arranged in the second load area. The first load area and the second load area are both provided with the cold storage device. The cold storage device in the first load area is used to enter the continuous cooling mode to continuously cool the terminal devices in the first load area; the cold storage device in the second load area is used to enter the continuous cooling mode to continuously cool the terminal devices in the second load area.

[0018] In a second aspect, an embodiment of the present invention provides a refrigeration system, which includes the cold storage device, the cold source system and the terminal device as described in any one of the above embodiments.

[0019] In a third aspect, an embodiment of the present invention provides a control method for a refrigeration system, the refrigeration system comprising a cold source system, a terminal device, and a cold storage device, the cold source system comprising a first cold machine, the terminal device being used to cool a load, the cold storage device comprising a second cold machine and a cold storage tank, the evaporator of the first cold machine and the condenser of the second cold machine being connected via a valve body assembly and being used with the terminal device to form a first refrigeration circuit, the evaporator of the second cold machine and the cold storage tank being used to form a second refrigeration circuit; the control method comprising:

[0020] In the cold charging mode, the first refrigeration circuit and the second refrigeration circuit are controlled to operate independently, the liquid outlet of the evaporator of the second cold machine charges cold to the liquid inlet of the cold storage tank, and the liquid outlet of the cold storage tank is supplied to the liquid inlet of the evaporator of the second cold machine. By controlling the valve body assembly, the liquid at the liquid outlet of the terminal device and the liquid at the liquid outlet of the condenser of the second cold machine are mixed, and then supplied to the liquid inlet of the terminal device and the liquid inlet of the condenser of the second cold machine via the evaporator of the first cold machine.

[0021] In the cooling mode, by controlling the valve body assembly, the liquid at the liquid outlet end of the terminal device and the liquid at the liquid outlet end of the cold storage tank are mixed and then provided to the liquid inlet end of the terminal device through the evaporator of the first cold machine, and to the liquid inlet end of the condenser of the second cold machine through the valve body assembly.

[0022] In one embodiment, the valve body assembly includes a first three-way valve assembly and a second three-way valve assembly, the liquid inlet end of the cold storage tank is connected to the liquid outlet end of the evaporator of the second cold machine and the first port of the first three-way valve assembly, the liquid outlet end of the cold storage tank is connected to the liquid inlet end of the evaporator of the second cold machine and the first port of the second three-way valve assembly, the second port of the first three-way valve assembly is connected to the liquid inlet end of the condenser of the second cold machine, the third port of the first three-way valve assembly is connected to the liquid outlet end of the evaporator of the first cold machine, the second port of the second three-way valve assembly is connected to the liquid outlet end of the condenser of the second cold machine, and the third port of the second three-way valve assembly is connected to the liquid inlet end of the evaporator of the first cold machine;

[0023] In the cold charging mode, the liquid outlet of the evaporator of the second cold machine is charged with cold to the liquid inlet of the cold storage tank, the liquid at the liquid outlet of the cold storage tank is provided to the liquid inlet of the evaporator of the second cold machine, the liquid at the liquid outlet of the evaporator of the first cold machine is passed through the first three-way valve assembly to the liquid inlet of the condenser of the second cold machine, the liquid at the liquid outlet of the condenser of the second cold machine is mixed with the liquid at the liquid outlet of the terminal device after passing through the second three-way valve assembly and provided to the liquid inlet of the evaporator of the first cold machine;

[0024] In the cooling mode, the liquid at the liquid outlet of the cold storage tank is mixed with the liquid at the liquid outlet of the terminal device after passing through the second three-way valve assembly and is then provided to the liquid inlet of the evaporator of the first cold machine. The liquid at the liquid outlet of the evaporator of the first cold machine is provided to the liquid inlet of the cold storage tank through the first three-way valve assembly.

[0025] In one embodiment, the cooling mode includes a peak shaving cooling mode and a continuous cooling mode, and the control method further includes the following steps:

[0026] Determine whether it is during peak power hours.

[0027] If it is determined that the power supply is in the peak period, whether the liquid temperature of the cold storage tank is lower than a first set value is determined; if it is determined that the liquid temperature of the cold storage tank is lower than the first set value, the refrigeration system is controlled to enter the peak shaving and cooling mode; the valve opening of the second three-way valve assembly is controlled according to the liquid temperature of the liquid outlet of the terminal device and the liquid temperature of the liquid outlet of the cold storage tank so that the temperature of the liquid inlet of the evaporator of the first cold machine is a second set value, and the temperature of the liquid outlet of the evaporator of the first cold machine is a third set value lower than the second set value, and the third set value is higher than the first set value and equal to the liquid temperature of the liquid inlet of the terminal device;

[0028] Determining whether both the first and second chillers are shut down and whether the liquid temperature at the liquid outlet of the cold storage tank is lower than the liquid temperature at the liquid inlet of the terminal device, if so, controlling the refrigeration system to enter the continuous cooling mode, and controlling the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet of the terminal device and the liquid temperature at the liquid outlet of the cold storage tank so that the temperature at the liquid inlet of the evaporator of the first chiller is equal to the liquid temperature at the liquid inlet of the terminal device;

[0029] If it is determined that the power supply is in the off-peak period and the liquid temperature of the cold storage tank is lower than the preset temperature value, the controller controls the refrigeration system to enter the cold charging mode.

[0030] In one embodiment, the control method also includes the following steps of obtaining the clippable peak power of the cold source system, and controlling the valve opening of the second three-way valve assembly and the operating power of the cold source system according to the clippable peak power of the cold source system, the liquid temperature at the liquid outlet of the terminal device, and the liquid temperature at the liquid outlet of the cold storage tank, so that the temperature at the liquid inlet end of the evaporator of the first cold machine is the second set value.

[0031] In one embodiment, the valve body assembly includes a first three-way valve assembly and a second three-way valve assembly, and the cold storage device further includes a heat exchanger having a first heat exchange branch and a second heat exchange branch, the first heat exchange branch and the second heat exchange branch being arranged opposite to each other and configured to exchange heat with each other, the first heat exchange branch being connected in series with the cold storage tank and the evaporator of the second cold machine and being located in the first refrigeration circuit;

[0032] The liquid outlet of the second heat exchange branch is connected to the first port of the second three-way valve assembly, the second port of the second three-way valve assembly is connected to the liquid outlet of the condenser of the second cold machine, the third port of the second three-way valve assembly is connected to the liquid inlet of the evaporator of the first cold machine, the first port of the first three-way valve assembly is connected to the second heat exchange branch, the second port of the first three-way valve assembly is connected to the liquid inlet of the condenser of the second cold machine, and the third port of the first three-way valve assembly is connected to the liquid outlet of the evaporator of the first cold machine.

[0033] In the cold charging mode, the liquid outlet of the evaporator of the second cold machine is controlled to charge the liquid inlet of the cold storage tank with cold. The liquid at the liquid outlet of the cold storage tank is supplied to the liquid inlet of the evaporator of the second cold machine via the first heat exchange branch. The liquid at the liquid outlet of the evaporator of the first cold machine is supplied to the liquid inlet of the terminal device and to the liquid inlet of the condenser of the second cold machine via the first three-way valve assembly. The liquid at the liquid outlet of the condenser of the second cold machine is mixed with the liquid at the liquid outlet of the terminal device via the second three-way valve assembly and then supplied to the liquid inlet of the evaporator of the first cold machine.

[0034] In the cooling mode, the liquid at the liquid outlet of the cold storage tank is controlled to be provided to the liquid inlet of the evaporator of the second cold machine via the first heat exchange branch. After the liquid in the second heat exchange branch is heat exchanged with the liquid in the first heat exchange branch, it is mixed with the liquid at the liquid outlet of the terminal device through the second three-way valve assembly, and then provided to the liquid inlet of the terminal device via the evaporator of the first cold machine, and flows into the second heat exchange branch via the first three-way valve assembly, thereby being provided to the liquid inlet of the condenser of the second cold machine.

[0035] In one embodiment, the cooling mode includes a peak shaving cooling mode and a continuous cooling mode, and the control method further includes the following steps:

[0036] Steps for determining whether it is during peak power period,

[0037] If it is determined that the power supply is in the peak period, it is determined whether the liquid temperature at the liquid outlet of the cold storage tank is lower than the first set value. If it is determined that the liquid temperature at the liquid outlet of the second heat exchange branch is lower than the first set value, the refrigeration system is controlled to enter the peak shaving and cooling mode. The controller controls the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet of the terminal device and the liquid temperature at the liquid outlet of the second heat exchange branch so that the temperature at the liquid inlet of the evaporator of the first cold machine is the second set value, and the temperature at the liquid outlet of the evaporator of the first cold machine is the third set value lower than the second set value. The third set value is higher than the first set value and equal to the liquid temperature value at the liquid inlet of the terminal device.

[0038] Determine whether both the first and second chillers are shut down, and whether the liquid temperature at the liquid outlet of the second heat exchange branch is lower than the liquid temperature at the liquid inlet of the terminal device. If so, control the refrigeration system to enter the continuous cooling mode, and control the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet of the terminal device and the liquid temperature at the liquid outlet of the second heat exchange branch so that the temperature at the liquid inlet of the evaporator of the first chiller is equal to the liquid temperature at the liquid inlet of the terminal device.

[0039] If it is determined that the power supply is in the off-peak period and the liquid temperature of the cold storage tank is lower than the preset temperature value, the controller controls the refrigeration system to enter the cold charging mode.

[0040] In one embodiment, the control method also includes the following steps of obtaining the clippable peak power of the cold source system, and controlling the valve opening of the second three-way valve assembly and the operating power of the cold source system according to the clippable peak power of the cold source system, the liquid temperature at the liquid outlet of the terminal device, and the liquid temperature at the liquid outlet of the second heat exchange branch, so that the temperature at the liquid inlet end of the evaporator of the first cold machine is the second set value.

[0041] In a fourth aspect, an embodiment of the present invention provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the control method as described in any one of the above embodiments.

[0042] Compared with the existing technology, the beneficial effects of the technical solution of this application are:

[0043] In the cold storage device, refrigeration system, control method and storage medium provided by the embodiment of the present application, the evaporator of the first cold machine and the condenser of the second cold machine are connected through a valve body assembly and form a first refrigeration circuit with the terminal device, the evaporator of the second cold machine and the cold storage tank form a second refrigeration circuit, and in the cold charging mode, the first refrigeration circuit and the second refrigeration circuit can operate independently, the first cold machine releases cold through the first refrigeration circuit, and the second refrigeration circuit charges cold. Since the second cold machine isolates the charging and cooling circuits, and uses the system chilled water as the inlet and outlet water of the condenser of the second cold machine, the second cold machine can further produce lower temperature chilled water to charge the cold storage tank, which can make the water storage temperature of the cold storage tank lower, thereby storing more cold capacity, occupying a smaller volume, and having higher cold charging efficiency. In addition, in the above-mentioned device and system, the design and control of the main valve body assembly can realize the switching of the refrigeration state of the cold storage device, the system control and pipeline design are relatively simple, and the hardware cost and installation and modification cost are also low. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the structure of the refrigeration system provided in Example 1 of the present application.

[0045] Figure 2 It is a structural schematic diagram of the cold storage device provided in Example 1 of the present application.

[0046] Figure 3 for Figure 1 The connection diagram of the refrigeration system is shown.

[0047] Figure 4 for Figure 1 Schematic diagram of the liquid flow path of the refrigeration system in the charging and cooling mode.

[0048] Figure 5 for Figure 1 The liquid flow path diagram of the refrigeration system shown is in cooling mode.

[0049] Figure 6 yes Figure 1 Schematic diagram of heat exchange of the refrigeration system shown in the charging and cooling mode.

[0050] Figure 7 yes Figure 1 The heat exchange diagram of the refrigeration system shown is in peak shaving and cooling mode.

[0051] Figure 8 yes Figure 1 The heat exchange diagram of the refrigeration system shown is in continuous cooling mode.

[0052] Figure 9 yes Figure 1 A flow chart of a control method for a refrigeration system is shown.

[0053] Figure 10 yes Figure 1 A flow chart of another control method for a refrigeration system is shown.

[0054] Figure 11 yes Figure 1 A flow chart of another control method for a refrigeration system is shown.

[0055] Figure 12 yes Figure 1 Schematic diagram of the cooling capacity of the cold storage tank of the refrigeration system shown.

[0056] Figure 13 yes Figure 1 Schematic diagram of the cooling capacity of the cold storage tank of the refrigeration system shown throughout the day.

[0057] Figure 14 yes Figure 1 Schematic diagram of the cooling temperature of the cold storage tank of the refrigeration system shown throughout the day.

[0058] Figure 15 A schematic structural diagram of a refrigeration system provided in Example 2 of the present application.

[0059] Figure 16 yes Figure 15 A flow chart of a control method for a refrigeration system is shown.

[0060] Figure 17 yes Figure 15 A flow chart of another control method for a refrigeration system is shown.

[0061] Figure 18 A schematic structural diagram of a refrigeration system provided in Example 3 of the present application.

[0062] Figure 19 A schematic structural diagram of a refrigeration system provided in Example 4 of the present application.

[0063] Figure 20 A structural diagram of a refrigeration system provided in Example 5 of the present application.

[0064] Figure 21 A structural diagram of a refrigeration system provided in Example 6 of the present application.

[0065] Figure 22 A schematic diagram of the structure of the storage medium provided in Example 7 of the present application.

[0066] Description of reference numerals:

[0067] 1. Refrigeration system; 2. Cold storage device; 21. Second chiller; 211. Condenser; 212. Evaporator; 213. Expansion valve; 214. Compressor; 22. Cold storage tank; 23. Heat exchanger; 231. First heat exchange branch; 232. Second heat exchange branch; 3. Cold source system; 31. First chiller; 311. Evaporator; 312. Condenser; 32. Fan; 33. Third pump unit; 34. Cooling tower; 4. Terminal equipment; 5. Valve body assembly; 51. First three-way valve assembly; 511. First port; 512. Second port; 513. Third port; 52. Second three-way valve assembly; 521. First port; 522. Second port; 523. Third port; 61. First pump unit; 62. Second pump unit; 7. Controller; 8. Cold source area; 9. Load area; 91. First load area; 92. Second load area. DETAILED DESCRIPTION

[0068] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0069] The terms "first", "second" and "third" in the present invention are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second" and "third" may explicitly or implicitly include at least one of such features. In the description of the present invention, "multiple" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined. All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0070] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0071] Example 1

[0072] like Figure 1As shown, this embodiment discloses a refrigeration system 1, which includes a cold storage device 2, a cold source system 3, and a terminal device 4. The cold source system 3 includes a first cold machine 31, which can be a water chiller and can include a refrigeration circuit with an evaporator 311. The terminal device 4 is used to cool the load, which can be related equipment of a data center, etc. The terminal device 4 can be set near the heat source of the data center (such as a server), and can be an air conditioner or other equipment used for refrigeration. The cold source system 3 can cool the coolant and then transport the cooled coolant to the terminal device 4 through a pipeline. At the terminal device 4, heat exchange is performed to allow the coolant to absorb heat for dissipating heat and cooling the data center. It can be understood that the coolant in each pipeline in the refrigeration system 1 can be a refrigerant medium such as water or antifreeze, and the specific medium can be selected according to actual needs.

[0073] In this embodiment, the cold storage device 2 is used in the refrigeration system 1 having the cold source system 3 and the terminal device 4. Figure 2 、 Figure 3 As shown, the cold storage device 2 includes a second cold machine 21 and a cold storage tank 22. The second cold machine 21 can be a water-cooled chiller, which can include a refrigeration circuit consisting of an evaporator 212, an expansion valve 213, a condenser 211, a compressor 214, etc. connected in sequence.

[0074] Specifically, the evaporator 311 of the first chiller 31 and the condenser 211 of the second chiller 21 are connected via a valve assembly 5 and, together with the terminal device 4, form a first refrigeration circuit. The evaporator 212 of the second chiller 21 and the cold storage tank 22 form a second refrigeration circuit. It should be noted that the valve assembly 5 is a switching / conduction device. Controlling the valve assembly 5 can control the flow of coolant in the pipe connected to the liquid end.

[0075] It can be understood that the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is respectively connected to the liquid inlet A71 of the terminal device 4 and the liquid inlet A11 of the condenser 211 of the second cold machine 21, the liquid outlet A72 of the terminal device 4 and the liquid outlet A12 of the condenser 211 of the second cold machine 21 are commonly connected to the liquid inlet A61 of the evaporator 311 of the first cold machine 31, forming the first refrigeration circuit, the liquid outlet A22 of the evaporator 212 of the second cold machine 21 is connected to the liquid inlet A31 of the cold storage tank 22, and the liquid outlet A32 of the cold storage tank 22 is connected to the liquid inlet A21 of the evaporator 212 of the second cold machine 21, forming the second refrigeration circuit.

[0076] In the cold charging mode, the first refrigeration circuit and the second refrigeration circuit operate independently, and the liquid outlet A22 of the evaporator 212 of the second cold machine 21 charges cold to the liquid inlet A31 of the cold storage tank 22, and the liquid outlet A32 of the cold storage tank 22 is provided to the liquid inlet A21 of the evaporator 212 of the second cold machine 21. By controlling the valve body assembly 5, the liquid at the liquid outlet A72 of the terminal device 4 and the liquid at the liquid outlet A12 of the condenser 211 of the second cold machine 21 are mixed, and then provided to the liquid inlet A71 of the terminal device 4 and the liquid inlet A11 of the condenser 211 of the second cold machine 21 via the evaporator 311 of the first cold machine 31. It can be understood that in the cold charging mode, the liquid outlet A62 of the evaporator 311 of the first cold machine 31 delivers part of the cooling liquid for cooling to the liquid inlet A71 of the terminal device 4 for load cooling, and delivers part of the cooling liquid to the liquid inlet of the condenser 211 of the second cold machine 21. The second cold machine 21 uses the cooling liquid output by the first cold machine 31 as the inlet liquid for further refrigeration, and can produce a lower temperature refrigerant, such as Figure 4 As shown in the direction of the arrow, the liquid temperature of the cold storage tank 22 can be set lower, and is calculated according to the cold storage capacity formula CMΔT, wherein C is the specific heat capacity of the heat transfer medium, M is the weight of the heat transfer medium, and ΔT is the temperature difference of the heat transfer medium, that is, the temperature difference between the cold storage liquid temperature in the cold storage tank 22 in the initial state and the cold storage liquid temperature in the cold storage tank 22 in the end state. When the liquid temperature of the cold storage tank 22 is low and the temperature difference with the liquid supply temperature of the cold source system 3 is large, the temperature difference of the low liquid temperature of the cold storage tank 22 is larger under the condition of the same cold storage capacity, and the required mass is smaller, that is, the required cold storage tank volume is smaller, or the cold storage tank 22 can store more cold capacity at a lower liquid temperature under the same storage volume.

[0077] In the cooling mode, the valve body assembly 5 is controlled so that the liquid at the liquid outlet A72 of the terminal device 4 is mixed with the liquid at the liquid outlet A32 of the cold storage tank 22, and then provided to the liquid inlet A71 of the terminal device 4 via the evaporator 311 of the first cold machine 31, and provided to the liquid inlet A11 of the condenser 211 of the second cold machine 21 via the valve body assembly 5. It can be understood that when a fault such as a mains power outage occurs, causing the refrigeration system 1 to shut down, the refrigeration system 1 will enter the cooling mode to provide continuous cooling for the data center. In the cooling mode, the coolant that has been heated up after heat exchange at the liquid outlet A72 of the terminal device 4 is mixed with the low-temperature coolant at the liquid outlet A32 of the cold storage tank 22 to cool down, and then provided to the terminal device 4 again for cooling the load, such as Figure 5 Indicated by the arrow direction.

[0078] Specifically, see Figure 3As shown, the valve body assembly 5 includes a first three-way valve assembly 51 and a second three-way valve assembly 52. ​​In this embodiment, the first three-way valve assembly 51 can be a three-way control valve, or a valve body assembly 5 composed of two two-way control valves, and the second three-way valve assembly 52 can also be a three-way control valve, or a valve body assembly 5 composed of two two-way control valves. The first three-way valve assembly 51 and the second three-way valve assembly 52 can realize switching between two input pipelines, or adjust the opening, so that only one of the two liquids is output or the two liquids are output in a combined manner. Figure 3 As shown, the first three-way valve assembly 51 and the second three-way valve assembly 52 are both composed of two two-way control valves.

[0079] The liquid inlet end A31 of the cold storage tank 22 is connected to the liquid outlet end A22 of the evaporator 212 of the second cold machine 21 and the first port 511 of the first three-way valve assembly 51. The liquid outlet end A32 of the cold storage tank 22 is connected to the liquid inlet end A21 of the evaporator 212 of the second cold machine 21 and the first port 521 of the second three-way valve assembly 52. ​​The second port 512 of the first three-way valve assembly 51 is connected to the liquid inlet end A11 of the condenser 211 of the second cold machine 21. The third port 513 of the first three-way valve assembly 51 is connected to the liquid outlet end A62 of the evaporator 311 of the first cold machine 31. The second port 522 of the second three-way valve assembly 52 is connected to the liquid outlet end A12 of the condenser 211 of the second cold machine 21. The third port 523 of the second three-way valve assembly 52 is connected to the liquid inlet end A61 of the evaporator 311 of the first cold machine 31.

[0080] In the cold charging mode, the liquid outlet A22 of the evaporator 212 of the second cold machine 21 is charged with cold to the liquid inlet A31 of the cold storage tank 22, and the liquid at the liquid outlet A32 of the cold storage tank 22 is provided to the liquid inlet A21 of the evaporator 212 of the second cold machine 21, and the liquid at the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is provided to the liquid inlet A11 of the condenser 211 of the second cold machine 21 through the first three-way valve assembly 51, and the liquid at the liquid outlet A12 of the condenser 211 of the second cold machine 21 is provided to the liquid inlet A61 of the evaporator 311 of the first cold machine 31 after being mixed with the liquid at the liquid outlet A72 of the terminal device 4 through the second three-way valve assembly 52.

[0081] In the cooling mode, the liquid at the liquid outlet A32 of the cold storage tank 22 is mixed with the liquid at the liquid outlet A72 of the terminal device 4 after passing through the second three-way valve assembly 52, and is then provided to the liquid inlet A61 of the evaporator 311 of the first cold machine 31. The liquid at the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is provided to the liquid inlet A31 of the cold storage tank 22 through the first three-way valve assembly 51.

[0082] Please continue reading Figure 3 As shown, the refrigeration system 1 also includes a controller 7, which is electrically connected to the valve body assembly 5. The valve of the valve body assembly 5 can adjust the opening. At different openings, the liquid at the liquid outlet A72 of the terminal device 4 and the liquid at the liquid outlet A32 of the cold storage tank 22 can be mixed to produce different temperatures.

[0083] Because power plants generate electricity continuously around the clock, if the generated electricity is not used, the energy used for power generation is wasted. The power generation capacity of a power plant is usually fixed and cannot be easily changed. However, peak electricity demand is usually during the day, resulting in insufficient electricity during the day, while the night is the trough, and the excess electricity that cannot be used is wasted. Therefore, power companies implement time-of-use electricity prices to encourage customers to shift peak loads to off-peak hours. Electricity-consuming enterprises (such as data centers) can reduce electricity costs by shifting the peak load of the cooling system to off-peak hours. In this embodiment, the cooling mode includes a peak-shaving cooling mode and a continuous cooling mode.

[0084] During the peak power period, when the liquid temperature of the cold storage tank 22 is lower than the first set value, the controller 7 controls the refrigeration system 1 to enter the peak shaving and cooling mode. The controller 7 controls the valve opening of the second three-way valve assembly 52 according to the liquid temperature of the liquid outlet A72 of the terminal device 4 and the liquid temperature of the liquid outlet A32 of the cold storage tank 22 so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value, and the temperature of the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is the third set value lower than the second set value. The third set value is higher than the first set value and equal to the liquid temperature value of the liquid inlet A71 of the terminal device 4.

[0085] When the first cold machine 31 and the second cold machine 21 are both in the closed state, and the liquid temperature of the cold storage tank 22 is lower than the liquid temperature value of the liquid inlet end A71 of the terminal device 4, the controller 7 controls the refrigeration system 1 to enter the continuous cooling mode, and the controller 7 controls the valve opening of the second three-way valve assembly 52 according to the liquid temperature of the liquid outlet end A72 of the terminal device 4 and the liquid temperature of the liquid outlet end A32 of the cold storage tank 22 so that the temperature of the liquid inlet end A61 of the evaporator 311 of the first cold machine 31 is equal to the liquid temperature value of the liquid inlet end A71 of the terminal device 4.

[0086] During off-peak hours, when the liquid temperature of the cold storage tank 22 is lower than a preset temperature value, the controller 7 controls the refrigeration system 1 to enter the cold charging mode.

[0087] A data center is a building that provides an operating environment for electronic information equipment that is centrally located. Therefore, it must have an electromechanical system that provides power and environmental support for the normal operation of electronic information equipment. Since the electromechanical system of a data center consumes a large amount of electricity, the electricity consumed by the refrigeration system 1 accounts for more than half of the annual electricity consumption of the electromechanical system of the entire data center. Therefore, without affecting the refrigeration effect of the refrigeration system 1, the peak-cutting cooling mode can be operated during the peak electricity price period and the charging cooling mode can be operated during the valley electricity price period. That is, the peak-cutting and valley-filling method can effectively reduce the power consumption of the refrigeration system 1, thereby reducing the electricity cost of the electricity user. The electricity user transfers the peak load of the refrigeration system to the off-peak period and makes full use of the off-peak period. That is, during the peak electricity price period during the day, the low-temperature water cooling capacity of the cold storage tank 22 can be released, thereby reducing the power consumption of the cold source system 3, realizing the peak-cutting function of the refrigeration system 1, and reducing the electricity operation cost. At the same time, by setting the first set value, continuous cooling can be guaranteed while performing the peak shaving cooling, so that the first cold machine 31 and the second cold machine 21 of the refrigeration system 1 can still perform normal cooling functions in the event of a power outage.

[0088] See also Figures 6 to 8 The following describes the cooling mode, peak shaving cooling mode and continuous cooling mode in conjunction with the accompanying drawings.

[0089] When the mains electricity is normally supplied and the cooling capacity of the cold storage tank 22 is sufficient to support the continuous cooling mode, the start time of the cooling mode can be specified, for example, the cooling mode can be operated during the off-peak hours at night when electricity prices are low.

[0090] During the off-peak period, when the liquid temperature of the cold storage tank 22 is lower than the preset temperature value, the controller 7 controls the refrigeration system 1 to enter the cold charging mode. In this embodiment, the preset temperature value can be set to 15°C. After entering the cold charging mode, the first cold machine 31 normally provides the terminal device 4 with coolant refrigeration for cooling the load. The outlet end A62 of the evaporator 311 of the first cold machine 31 outputs a portion of the 20°C coolant to the liquid inlet end A71 of the terminal device 4. After heat exchange, the terminal device 4 outputs a 30°C coolant from the liquid outlet end A72 of the terminal device 4. The liquid outlet end A62 of the evaporator 311 of the first cold machine 31 outputs another portion of the 20°C coolant to the liquid inlet end A11 of the condenser 211 of the second cold machine 21, absorbs the refrigerant heat of the condenser 211 of the second cold machine 21, condenses the high-temperature and high-pressure refrigerant (such as Freon) gas into a low-temperature and high-pressure liquid, and then flows into the The expansion valve 213, after being throttled to a low-temperature, low-pressure liquid, flows into the evaporator 212, absorbs the heat of the coolant in the evaporator 212 and turns into a low-temperature, low-pressure gas, and then enters the condenser 211 again after mechanical work is performed by the compressor 214 to form a high-temperature, high-pressure gas, thus forming an internal refrigeration circuit of the second cold machine 21. After the coolant temperature in the evaporator 212 is further reduced to 3°C, it is supplied from the outlet of the evaporator 212 to the inlet of the cold storage tank 22. The liquid inlet charges the cold storage tank 22 with cold. The liquid at the liquid outlet A32 of the cold storage tank 22 is supplied to the liquid inlet A21 of the evaporator 212 of the second cold machine 21. The 30°C coolant output from the liquid outlet A12 of the condenser 211 of the second cold machine 21 passes through the second three-way valve assembly 52, mixes with the 30°C coolant at the liquid outlet A72 of the terminal device 4, and is then supplied to the liquid inlet A61 of the evaporator 311 of the first cold machine 31 to undergo another refrigeration cycle. This completes the cooling and cooling of the load and the cold charging of the cold storage device 2. Figure 6 shown.

[0091] During the peak power period, when the coolant temperature in the cold storage tank 22 is lower than the first set value, in this embodiment, the first set value is 15°C, and after the cold storage tank 22 is charged with cold, the coolant temperature therein is 3°C, which is lower than the first set value. The controller 7 controls the refrigeration system 1 to enter the peak-shaving cooling mode. The controller 7 controls the valve opening of the second three-way valve assembly 52 according to the liquid temperature of 30°C at the liquid outlet A72 of the terminal device 4 and the liquid temperature of 3°C at the liquid outlet A32 of the cold storage tank 22, so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value. The second set The set value can be 26°C, that is, the controller 7 controls the valve opening of the second three-way valve assembly 52 to mix the liquid at the liquid outlet A72 of the terminal device 4 and the liquid at the liquid outlet A32 of the cold storage tank 22 in a certain proportion, so that the liquid inlet temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is 26°C. After being refrigerated by the first cold machine 31, the temperature of the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is a third set value lower than the second set value of 26°C. The third set value can be 20°C, that is, the coolant at 20°C is delivered to the liquid inlet A71 of the terminal device 4. Figure 7 As shown. Thus, in the peak-shaving cooling mode, the liquid temperature at the liquid inlet end A61 of the evaporator 311 of the first chiller 31 is 26°C, which is 4°C lower than the liquid temperature of 30°C at the liquid outlet end A72 of the terminal device 4. At this time, the first chiller 31 cools the 26°C liquid to 20°C liquid, which can greatly reduce the cooling power consumption compared to cooling the 30°C liquid to 20°C liquid, thereby achieving the peak power shaving function of the refrigeration system 1.

[0092] When a power failure occurs, causing the first cold machine 31 and the second cold machine 21 to be in the off state, and the liquid temperature of the cold storage tank 22 is 3°C lower than the liquid temperature of the liquid inlet end A71 of the terminal device 4 by 20°C, the controller 7 controls the refrigeration system 1 to enter the continuous cooling mode, and the controller 7 can control the valve opening of the second three-way valve assembly 52 according to the liquid temperature of the liquid outlet end A72 of the terminal device 4 of 30°C and the liquid temperature of the liquid outlet end A32 of the cold storage tank 22 of 3°C, such as by controlling the second three-way valve assembly 52 The valve opening is set to , and the liquid at the liquid outlet A72 of the terminal device 4 is mixed with the liquid at the liquid outlet A32 of the cold storage tank 22 at a ratio of 37% of the liquid at the liquid outlet A32 of the cold storage tank 22 at 3°C, and 63% of the liquid at the liquid outlet A72 of the terminal device 4 at 30°C, so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is reduced to 20°C, which is equal to the liquid temperature of 20°C at the liquid inlet A71 of the terminal device 4. At this time, the continuous cooling function of the refrigeration system 1 can be guaranteed without the need for the first cold machine 31 to perform refrigeration.

[0093] Furthermore, the controller 7 also obtains the shaving peak power of the cold source system 3, and controls the valve opening of the second three-way valve assembly 52 and the operating power of the cold source system 3 according to the shaving peak power of the cold source system 3, the liquid temperature of the liquid outlet A72 of the terminal device 4, and the liquid temperature of the liquid outlet A32 of the cold storage tank 22, so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value. In this embodiment, the power of the cold source system 3 before peak shaving is 300KW, the power after peak shaving is 200KW, the peak shaving power is 100KW, the liquid temperature of the liquid outlet A72 of the terminal device 4 is 30°C, and the liquid temperature of the liquid outlet A32 of the cold storage tank 22 is 3°C. Therefore, the controller 7 can control the valve opening of the second three-way valve assembly 52 and the operating power of the cold source system 3 according to the peak shaving power of the cold source system 3, the liquid temperature of the liquid outlet A72 of the terminal device 4, and the liquid temperature of the liquid outlet A32 of the cold storage tank 22, so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value of 26°C.

[0094] like Figure 9 As shown, in this embodiment, the control method of the refrigeration system 1 can be executed by the controller 7. Specifically, the control method can include the following steps:

[0095] Step S11: In the cold charging mode, the first refrigeration circuit and the second refrigeration circuit are controlled to operate independently, and the liquid outlet A22 of the evaporator 212 of the second cold machine 21 charges cold to the liquid inlet A31 of the cold storage tank 22, and the liquid outlet A32 of the cold storage tank 22 is provided to the liquid inlet A21 of the evaporator 212 of the second cold machine 21. By controlling the valve body assembly 5, the liquid at the liquid outlet A72 of the terminal device 4 and the liquid at the liquid outlet A12 of the condenser 211 of the second cold machine 21 are mixed, and then provided to the liquid inlet A71 of the terminal device 4 and the liquid inlet A11 of the condenser 211 of the second cold machine 21 via the evaporator 311 of the first cold machine 31.

[0096] Step S12: In the cooling mode, by controlling the valve body assembly 5, the liquid at the liquid outlet A72 of the terminal device 4 and the liquid at the liquid outlet A32 of the cold storage tank 22 are mixed, and then provided to the liquid inlet A71 of the terminal device 4 through the evaporator 212 of the first cold machine 31, and provided to the liquid inlet A11 of the condenser 211 of the second cold machine 21 through the valve body assembly 5.

[0097] like Figure 10 As shown, the valve body assembly 5 includes a first three-way valve assembly 51 and a second three-way valve assembly 52. ​​The controller 7 executes the control method, which may further include the following steps:

[0098] Step S21: In the cold charging mode, the liquid outlet A22 of the evaporator 212 of the second cold machine 21 charges cold to the liquid inlet A31 of the cold storage tank 22, and the liquid at the liquid outlet A32 of the cold storage tank 22 is provided to the liquid inlet A21 of the evaporator 212 of the second cold machine 21. The liquid at the liquid outlet A62 of the evaporator 311 of the first cold machine 31 passes through the first three-way valve assembly 51 to the liquid inlet A11 of the condenser 211 of the second cold machine 21. The liquid at the liquid outlet A12 of the condenser 211 of the second cold machine 21 passes through the second three-way valve assembly 52 and is mixed with the liquid at the liquid outlet A72 of the terminal device 4 before being provided to the liquid inlet A61 of the evaporator 311 of the first cold machine 31.

[0099] Step S22: In the cooling mode, the liquid at the liquid outlet A32 of the cold storage tank 22 is mixed with the liquid at the liquid outlet A72 of the terminal device 4 after passing through the second three-way valve assembly 52, and is then provided to the liquid inlet A61 of the evaporator 311 of the first cold machine 31. The liquid at the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is provided to the liquid inlet A31 of the cold storage tank 22 through the first three-way valve assembly 51.

[0100] like Figure 11As shown, the cooling mode includes a peak shaving cooling mode and a continuous cooling mode, and the control method further includes the following steps:

[0101] Step S31: Determine whether the first cold machine 31 and the second cold machine 21 are both turned off, and the liquid temperature at the liquid outlet A32 of the cold storage tank 22 is lower than the liquid temperature value at the liquid inlet A71 of the terminal device 4. If so, execute step S32; if not, execute step S33.

[0102] Step S32: Control the refrigeration system 1 to enter the continuous cooling mode, and control the valve opening of the second three-way valve assembly 52 according to the liquid temperature of the liquid outlet A72 of the terminal device 4 and the liquid temperature of the liquid outlet A32 of the cold storage tank 22 so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is equal to the liquid temperature value of the liquid inlet A71 of the terminal device 4.

[0103] Step S33: Determine whether the current time is a peak power period or a valley power period. If it is a peak power period, execute step S331; if it is a valley power period, execute step S333. Specifically, step S33 may include: determining whether the current time is a peak power period; if it is a peak power period, execute step S331; if it is not a peak power period, further determine whether it is a valley power period; if it is a valley power period, execute step S333.

[0104] Step S331: determining whether the liquid temperature of the cold storage tank 22 is lower than a first set value. If it is determined that the liquid temperature of the cold storage tank 22 is lower than the first set value, executing step S332.

[0105] Step S332: Control the refrigeration system 1 to enter the peak shaving and cooling mode, and the controller 7 controls the valve opening of the second three-way valve assembly 52 according to the liquid temperature of the liquid outlet A72 of the terminal device 4 and the liquid temperature of the liquid outlet A32 of the cold storage tank 22 so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value, and the temperature of the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is the third set value lower than the second set value, and the third set value is higher than the first set value and equal to the liquid temperature value of the liquid inlet A71 of the terminal device 4.

[0106] Step S333: When the liquid temperature of the cold storage tank 22 is lower than a preset temperature value, the controller 7 controls the refrigeration system 1 to enter the cold charging mode.

[0107] The control method also includes the following steps of obtaining the shaving peak power of the cold source system 3, and controlling the valve opening of the second three-way valve assembly 52 and the operating power of the cold source system 3 according to the shaving peak power of the cold source system 3, the liquid temperature of the liquid outlet A72 of the terminal device 4, and the liquid temperature of the liquid outlet A32 of the cold storage tank 22, so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value.

[0108] The following combination Figure 12 、 13 , 14 illustrate the steps. In this embodiment, the first set value is 15°C, the second set value is 26°C, the third set value is 20°C, the preset temperature value is 15°C, the liquid temperature of the liquid outlet A72 of the terminal device 4 is 30°C, and the liquid temperature of the liquid outlet A32 of the cold storage tank 22 is 3°C. By calculating the cold amount that can be released from the liquid temperature of the liquid outlet A32 of the cold storage tank 22 from 3°C to 15°C and the cold amount that can be used for continuous cooling after reaching 15°C, the refrigeration capacity of the cold storage tank 22 can be configured as follows: Figure 12 Scale shown.

[0109] When a fault occurs and causes the first cold machine 31 and the second cold machine 21 to stop working, the controller 7 detects whether the liquid temperature of the liquid outlet end A32 of the cold storage tank 22 is lower than the liquid temperature value of the liquid inlet end A71 of the terminal device 4. If the liquid temperature of the liquid outlet end A32 of the cold storage tank 22 is lower than the liquid temperature value of the liquid inlet end A71 of the terminal device 4, the cold storage tank 22 can be used for refrigeration. At this time, the refrigeration system 1 enters the continuous cooling mode. At this time, the controller 7 controls the valve opening of the second three-way valve assembly 52 according to the liquid temperature of 30°C at the liquid outlet end A72 of the terminal device 4 and the liquid temperature of 3°C-15°C at the liquid outlet end A32 of the cold storage tank 22 so that the temperature of the liquid inlet end A61 of the evaporator 311 of the first cold machine 31 is equal to the liquid temperature value of 20°C at the liquid inlet end A71 of the terminal device 4.

[0110] When the first cold machine 31 and the second cold machine 21 are working normally, and the liquid temperature of the liquid outlet end A32 of the cold storage tank 22 is lower than the liquid temperature value of the liquid inlet end A71 of the terminal device 4, it is determined whether it is a peak power period or a valley power period. In this embodiment, the peak power period is 12 o'clock-15 o'clock, and the valley power period is 0 o'clock-6 o'clock. If it is in the peak power period, it is determined whether the liquid temperature of the cold storage tank 22 is lower than the first set value of 15°C. If it is determined that the liquid temperature of the cold storage tank 22 is lower than 15°C, the refrigeration system 1 is controlled to enter In the peak shaving and cooling mode, the controller 7 controls the valve opening of the second three-way valve assembly 52 according to the liquid temperature of 30°C at the liquid outlet A72 of the terminal device 4 and the liquid temperature of 3°C-15°C at the liquid outlet A32 of the cold storage tank 22, so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value of 26°C. After the refrigeration of the first cold machine 31, the temperature of the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is the third set value of 20°C. At this time, the refrigeration capacity of the cold storage tank 22 is as follows: Figure 13 As shown in block 3, the coolant temperature of the cold storage tank 22 is as follows Figure 14 As shown by line segment 3.

[0111] If it is in the off-peak period, and the first cooling machine 31 and the second cooling machine 21 are working normally, and the liquid temperature of the cold storage tank 22 is lower than 15°C, the controller 7 controls the refrigeration system 1 to enter the cold charging mode. At this time, the refrigeration capacity of the cold storage tank 22 is as follows: Figure 13 As shown in block 1, the coolant temperature of the cold storage tank 22 is as follows Figure 14 As shown by line segment 1.

[0112] If it is neither in the peak power period nor in the valley power period, when the liquid temperature of the cold storage tank 22 is lower than 15°C, the refrigeration system 1 is controlled to be cooled only by the cold source system 3. At this time, the refrigeration capacity of the cold storage tank 22 is as follows: Figure 13 As shown in block 2, the coolant temperature of the cold storage tank 22 is as follows Figure 14 As shown by line segment 2. When the liquid temperature of the cold storage tank 22 is not lower than 15°C, the refrigeration system 1 is controlled to be refrigerated only by the cold source system 3. At this time, the refrigeration capacity of the cold storage tank 22 is as follows: Figure 13 As shown in block 4, the coolant temperature of the cold storage tank 22 is as follows Figure 14 As shown by line segment 4.

[0113] Example 2

[0114] See also Figure 15 The structure and principle of the refrigeration system 1 provided in the second embodiment are basically the same as those of the refrigeration system 1 in the first embodiment. The following mainly describes the differences between the two.

[0115] The valve body assembly 5 includes a first three-way valve assembly 51 and a second three-way valve assembly 52. ​​The cold storage device 2 also includes a heat exchanger 23 having a first heat exchange branch 231 and a second heat exchange branch 232. The first heat exchange branch 231 and the second heat exchange branch 232 are arranged relative to each other and are used to exchange heat with each other. The first heat exchange branch 231 is connected in series with the cold storage tank 22 and the evaporator 212 of the second cold machine 21 and is located in the first refrigeration circuit; the liquid outlet end A52 of the second heat exchange branch 232 is connected to the first port 521 of the second three-way valve assembly 52, and the second three-way valve assembly 52 is connected to the first port 521 of the second three-way valve assembly 52. The second port 522 of the valve assembly 52 is connected to the liquid outlet A12 of the condenser 211 of the second cold machine 21, the third port 523 of the second three-way valve assembly 52 is connected to the liquid inlet A61 of the evaporator 311 of the first cold machine 31, the first port 511 of the first three-way valve assembly 51 is connected to the second heat exchange branch 232, the second port 512 of the first three-way valve assembly 51 is connected to the liquid inlet A11 of the condenser 211 of the second cold machine 21, and the third port 513 of the first three-way valve assembly 51 is connected to the liquid outlet A62 of the evaporator 311 of the first cold machine 31.

[0116] In the cold charging mode, the liquid outlet A22 of the evaporator 212 of the second cold machine 21 is charged with cold to the liquid inlet A31 of the cold storage tank 22, and the liquid at the liquid outlet A32 of the cold storage tank 22 is provided to the liquid inlet A21 of the evaporator 212 of the second cold machine 21 via the first heat exchange branch 231, and the liquid at the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is provided to the liquid inlet A71 of the terminal device 4 and to the liquid inlet A11 of the condenser 211 of the second cold machine 21 via the first three-way valve assembly 51. The liquid at the liquid outlet A12 of the condenser 211 of the second cold machine 21 is mixed with the liquid at the liquid outlet A72 of the terminal device 4 after passing through the second three-way valve assembly 52 and is provided to the liquid inlet A61 of the evaporator 311 of the first cold machine 31.

[0117] In the cooling mode, the liquid at the liquid outlet A32 of the cold storage tank 22 is provided to the liquid inlet A21 of the evaporator 212 of the second cold machine 21 via the first heat exchange branch 231. After the liquid in the second heat exchange branch 232 is heat-exchanged with the liquid in the first heat exchange branch 231, it is mixed with the liquid at the liquid outlet A72 of the terminal device 4 through the second three-way valve assembly 52, and then provided to the liquid inlet A71 of the terminal device 4 via the evaporator 311 of the first cold machine 31, and flows into the second heat exchange branch 232 via the first three-way valve assembly 51, thereby being provided to the liquid inlet A11 of the condenser 211 of the second cold machine 21.

[0118] The refrigeration system 1 also includes a controller 7, which is electrically connected to the valve body assembly 5. The cooling mode includes a peak-shaving cooling mode and a continuous cooling mode. During the peak power period, when the liquid temperature at the liquid outlet A52 of the second heat exchange branch 232 is lower than the first set value, the controller 7 controls the refrigeration system 1 to enter the peak-shaving cooling mode. The controller 7 controls the valve opening of the second three-way valve assembly 52 according to the liquid temperature at the liquid outlet A72 of the terminal device 4 and the liquid temperature at the liquid outlet A52 of the second heat exchange branch 232 so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value, and the temperature of the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is a third set value lower than the second set value. The third set value is higher than the first set value and equal to the liquid temperature value of the liquid inlet A71 of the terminal device 4.

[0119] When the first cold machine 31 and the second cold machine 21 are both in the closed state, and the liquid temperature at the liquid outlet end A52 of the second heat exchange branch 232 is lower than the liquid temperature value at the liquid inlet end A71 of the terminal device 4, the controller 7 controls the refrigeration system 1 to enter the continuous cooling mode, and the controller 7 controls the valve opening of the second three-way valve assembly 52 according to the liquid temperature at the liquid outlet end A72 of the terminal device 4 and the liquid temperature at the liquid outlet end A52 of the second heat exchange branch 232 so that the temperature of the liquid inlet end A61 of the evaporator 311 of the first cold machine 31 is equal to the liquid temperature value of the liquid inlet end A71 of the terminal device 4.

[0120] During off-peak hours, when the liquid temperature of the cold storage tank 22 is lower than a preset temperature value, the controller 7 controls the refrigeration system 1 to enter the cold charging mode.

[0121] The controller 7 also obtains the shaving peak power of the cold source system 3, and controls the valve opening of the second three-way valve assembly 52 and the operating power of the cold source system 3 according to the shaving peak power of the cold source system 3, the liquid temperature at the liquid outlet A72 of the terminal device 4, and the liquid temperature at the liquid outlet A52 of the second heat exchange branch 232, so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value.

[0122] like Figure 16 As shown, in this embodiment, the control method of the refrigeration system 1 can be executed by the controller 7. Specifically, the control method can include the following steps:

[0123] Step S41: In the cold charging mode, the liquid outlet A22 of the evaporator 212 of the second cold machine 21 is controlled to charge the liquid inlet A31 of the cold storage tank 22 with cold, and the liquid at the liquid outlet A32 of the cold storage tank 22 is provided to the liquid inlet A21 of the evaporator 212 of the second cold machine 21 via the first heat exchange branch 231, and the liquid at the liquid outlet A62 of the evaporator 311 of the first cold machine 31 is provided to the liquid inlet A71 of the terminal device 4 and provided to the liquid inlet A11 of the condenser 211 of the second cold machine 21 via the first three-way valve assembly 51, and the liquid at the liquid outlet A12 of the condenser 211 of the second cold machine 21 is mixed with the liquid at the liquid outlet A72 of the terminal device 4 after passing through the second three-way valve assembly 52 and is provided to the liquid inlet A61 of the evaporator 311 of the first cold machine 31.

[0124] Step S42: In the cooling mode, the liquid at the liquid outlet end A32 of the cold storage tank 22 is controlled to be provided to the liquid inlet end A21 of the evaporator 212 of the second cold machine 21 via the first heat exchange branch 231. After the liquid in the second heat exchange branch 232 is heat-exchanged with the liquid in the first heat exchange branch 231, it is mixed with the liquid at the liquid outlet end A72 of the terminal device 4 through the second three-way valve assembly 52, and then provided to the liquid inlet end A71 of the terminal device 4 via the evaporator 311 of the first cold machine 31, and flows into the second heat exchange branch 232 via the first three-way valve assembly 51, thereby being provided to the liquid inlet end A11 of the condenser 211 of the second cold machine 21.

[0125] like Figure 17 As shown, in this embodiment, the cooling mode includes a peak shaving cooling mode and a continuous cooling mode, and the control method further includes the following steps:

[0126] Step S51: Determine whether the first cold machine 31 and the second cold machine 21 are both turned off, and whether the liquid temperature at the liquid outlet A52 of the second heat exchange branch 232 is lower than the liquid temperature value at the liquid inlet A71 of the terminal device 4. If the judgment result is yes, execute step S52; if the judgment result is no, execute step S53.

[0127] Step S52: Control the refrigeration system 1 to enter the continuous cooling mode, and control the valve opening of the second three-way valve assembly 52 according to the liquid temperature of the liquid outlet A72 of the terminal device 4 and the liquid temperature of the liquid outlet A52 of the second heat exchange branch 232 so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is equal to the liquid temperature value of the liquid inlet A71 of the terminal device 4.

[0128] Step S53: Determine whether it is a peak power period or a valley power period. If it is determined to be a peak power period, execute step S531; if it is determined to be a valley power period, execute step S533.

[0129] Step S531: Determine whether the liquid temperature at the liquid outlet A32 of the cold storage tank 22 is lower than a first set value. If the liquid temperature at the liquid outlet A52 of the second heat exchange branch 232 is lower than the first set value, execute step S532.

[0130] Step S532: Control the refrigeration system 1 to enter the peak shaving and cooling mode, and the controller 7 controls the valve opening of the second three-way valve assembly 52 according to the liquid temperature of the liquid outlet A72 of the terminal device 4 and the liquid temperature of the liquid outlet A52 of the second heat exchange branch 232 so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value, and the temperature of the liquid outlet A22 of the evaporator 212 of the first cold machine 31 is the third set value lower than the second set value, and the third set value is higher than the first set value and equal to the liquid temperature value of the liquid inlet A71 of the terminal device 4.

[0131] Step S533: When the liquid temperature of the cold storage tank 22 is lower than a preset temperature value, the controller 7 controls the refrigeration system 1 to enter the cold charging mode.

[0132] The control method also includes the following steps of obtaining the shaving peak power of the cold source system 3, and controlling the valve opening of the second three-way valve assembly 52 and the operating power of the cold source system 3 according to the shaving peak power of the cold source system 3, the liquid temperature at the liquid outlet A72 of the terminal device 4, and the liquid temperature at the liquid outlet A52 of the second heat exchange branch 232, so that the temperature of the liquid inlet A61 of the evaporator 311 of the first cold machine 31 is the second set value.

[0133] Example 3

[0134] See also Figure 18 The structure and principle of the refrigeration system 1 provided in the third embodiment are substantially the same as those of the refrigeration system 1 in the first embodiment, and the following mainly describes the differences between the two.

[0135] The refrigeration system 1 also includes a first pump unit 61 and a second pump unit 62. The first pump unit 61 is connected to the first refrigeration circuit and is used to drive the flow of liquid in the first refrigeration circuit. The second pump unit 62 is connected to the second refrigeration circuit and is used to drive the flow of liquid in the second refrigeration circuit.

[0136] Example 4

[0137] See also Figure 19 The structure and principle of the refrigeration system 1 provided in the fourth embodiment are basically the same as those of the refrigeration system 1 in the first embodiment. The following mainly describes the differences between the two.

[0138] In this embodiment, the first cold machine 31 of the cold source system 3 of the refrigeration system 1 is an air-cooled cold machine, and further includes a fan 32 for dissipating heat from the condenser 312 of the first cold machine 31 .

[0139] Example 5

[0140] See also Figure 20 The structure and principle of the refrigeration system 1 provided in the fifth embodiment are substantially the same as those of the refrigeration system 1 in the first embodiment, and the following mainly describes the differences between the two.

[0141] In this embodiment, the first cold machine 31 of the cold source system 3 of the refrigeration system 1 is a liquid-cooled cold machine, and the cold source system 3 also includes a third pump unit 33 and a cooling tower 34. The cooling tower 34, the condenser 312 of the first cold machine 31, and the third pump unit 33 constitute a cooling branch.

[0142] Example 6

[0143] See also Figure 21 The structure and principle of the refrigeration system 1 provided in the sixth embodiment are substantially the same as those of the refrigeration system 1 in the first embodiment, and the following mainly describes the differences between the two.

[0144] The refrigeration system 1 includes multiple terminal devices 4, multiple cold source systems 3, and multiple cold storage devices 2. The liquid inlet ends A61 of multiple cold source systems 3 are respectively connected to the first liquid loop, the liquid outlet ends A72 of multiple terminal devices 4 are respectively connected to the first liquid loop, the liquid outlet ends A62 of multiple cold source systems 3 are respectively connected to the second liquid loop, and the liquid inlet ends A71 of multiple terminal devices 4 are respectively connected to the second liquid loop.

[0145] Multiple cold storage devices 2 are arranged in a cold source area 8 close to the cold source system 3, and multiple cold storage devices 2 are arranged in one or more load areas 9 close to the multiple terminal devices 4. Under the control of the controller 7, the multiple cold storage devices 2 in the cold source area 8 are allowed to run the peak shaving cooling mode and / or the continuous cooling mode, and the multiple cold storage devices 2 in the load area 9 only run the continuous cooling mode.

[0146] The load area 9 includes a first load area 91 and a second load area 92. The first part of the multiple terminal devices 4 is set in the first load area 91, and the second part of the multiple terminal devices 4 is set in the second load area 92. The first load area 91 and the second load area 92 are both provided with the cold storage device 2. The cold storage device 2 of the first load area 91 is used to enter the continuous cooling mode to continuously cool the terminal devices in the first load area 91; the cold storage device 2 of the second load area 92 is used to enter the continuous cooling mode to continuously cool the terminal devices in the second load area 92.

[0147] In this embodiment, multiple cold storage devices 2 are placed at different system locations to implement different charging and discharging cooling mode control strategies for the load area 9, which can realize flexible configuration of the group and management of charging and discharging cooling strategies. At the same time, the cold storage device 2 has a low cold storage temperature, a small size, and a distributed design, so its placement in the refrigeration system 1 is flexible.

[0148] Example 7

[0149] See Figure 22 , Figure 22 Schematic diagram of the structure of the storage medium of the embodiment of the present application. The storage medium of the embodiment of the present application is a computer-readable storage medium, which stores a program file 100 that can implement all the above methods, wherein the program file 100 can be stored in the above-mentioned computer-readable storage medium in the form of a software product, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned computer storage medium includes: various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or terminal devices such as a computer, a server, a mobile phone, and a tablet.

[0150] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0151] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0152] The above is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A cold storage device, used in a refrigeration system having a cold source system and a terminal device, wherein the cold source system includes a first cold machine, and the terminal device is used to cool a load, characterized in that: The cold storage device includes a second cold machine and a cold storage tank, the evaporator of the first cold machine and the condenser of the second cold machine are connected through a valve body assembly and are used to form a first refrigeration circuit with the terminal device, and the evaporator of the second cold machine and the cold storage tank are used to form a second refrigeration circuit; The refrigeration system further includes a controller electrically connected to the valve body assembly; In the cold charging mode, the first refrigeration circuit and the second refrigeration circuit operate independently, the liquid outlet of the evaporator of the second cold machine charges cold to the liquid inlet of the cold storage tank, and the liquid outlet of the cold storage tank is supplied to the liquid inlet of the evaporator of the second cold machine. The valve body assembly is controlled by the controller so that the liquid at the liquid outlet of the terminal device and the liquid at the liquid outlet of the condenser of the second cold machine are mixed and then supplied to the liquid inlet of the terminal device and the liquid inlet of the condenser of the second cold machine via the evaporator of the first cold machine. In the cooling mode, the valve body assembly is controlled by the controller so that the liquid at the liquid outlet of the terminal device is mixed with the liquid at the liquid outlet of the cold storage tank and then provided to the liquid inlet of the terminal device via the evaporator of the first cold machine, and to the liquid inlet of the condenser of the second cold machine via the valve body assembly.

2. The cold storage device according to claim 1, characterized in that The valve body assembly includes a first three-way valve assembly and a second three-way valve assembly, The liquid inlet end of the cold storage tank is connected to the liquid outlet end of the evaporator of the second cold machine and to the first port of the first three-way valve assembly, the liquid outlet end of the cold storage tank is connected to the liquid inlet end of the evaporator of the second cold machine and to the first port of the second three-way valve assembly, the second port of the first three-way valve assembly is connected to the liquid inlet end of the condenser of the second cold machine, the third port of the first three-way valve assembly is connected to the liquid outlet end of the evaporator of the first cold machine, the second port of the second three-way valve assembly is connected to the liquid outlet end of the condenser of the second cold machine, and the third port of the second three-way valve assembly is connected to the liquid inlet end of the evaporator of the first cold machine; In the cold charging mode, the liquid outlet of the evaporator of the second cold machine is charged with cold to the liquid inlet of the cold storage tank, the liquid at the liquid outlet of the cold storage tank is provided to the liquid inlet of the evaporator of the second cold machine, the liquid at the liquid outlet of the evaporator of the first cold machine is passed through the first three-way valve assembly to the liquid inlet of the condenser of the second cold machine, the liquid at the liquid outlet of the condenser of the second cold machine is mixed with the liquid at the liquid outlet of the terminal device after passing through the second three-way valve assembly and provided to the liquid inlet of the evaporator of the first cold machine; In the cooling mode, the liquid at the liquid outlet of the cold storage tank is mixed with the liquid at the liquid outlet of the terminal device after passing through the second three-way valve assembly and is then provided to the liquid inlet of the evaporator of the first cold machine. The liquid at the liquid outlet of the evaporator of the first cold machine is provided to the liquid inlet of the cold storage tank through the first three-way valve assembly.

3. The cold storage device according to claim 2, characterized in that The cooling mode includes a peak-shaving cooling mode and a continuous cooling mode. During peak power periods, when the liquid temperature of the cold storage tank is lower than a first set value, the controller controls the refrigeration system to enter the peak-shaving cooling mode. The controller controls the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet of the terminal device and the liquid temperature at the liquid outlet of the cold storage tank so that the temperature at the liquid inlet of the evaporator of the first chiller is a second set value, and the temperature at the liquid outlet of the evaporator of the first chiller is a third set value lower than the second set value, and the third set value is higher than the first set value and equal to the liquid temperature at the liquid inlet of the terminal device. When both the first chiller and the second chiller are in the off state, and the liquid temperature of the cold storage tank is lower than the liquid temperature value at the liquid inlet end of the terminal device, the controller controls the refrigeration system to enter the continuous cooling mode, and the controller controls the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet end of the terminal device and the liquid temperature at the liquid outlet end of the cold storage tank so that the temperature at the liquid inlet end of the evaporator of the first chiller is equal to the liquid temperature value at the liquid inlet end of the terminal device; During off-peak hours, when the liquid temperature of the cold storage tank is lower than a preset temperature value, the controller controls the refrigeration system to enter the cold charging mode.

4. The cold storage device according to claim 3, characterized in that The controller also obtains the clippable peak power of the cold source system, and controls the valve opening of the second three-way valve assembly and the operating power of the cold source system according to the clippable peak power of the cold source system, the liquid temperature at the liquid outlet of the terminal device, and the liquid temperature at the liquid outlet of the cold storage tank, so that the temperature at the liquid inlet of the evaporator of the first cold machine is the second set value.

5. The cold storage device according to claim 2, characterized in that The valve body assembly includes a first three-way valve assembly and a second three-way valve assembly, and the cold storage device also includes a heat exchanger having a first heat exchange branch and a second heat exchange branch, the first heat exchange branch and the second heat exchange branch are arranged opposite to each other and are used to exchange heat with each other, and the first heat exchange branch is connected in series with the cold storage tank and the evaporator of the second cold machine and is located in the first refrigeration circuit; The liquid outlet of the second heat exchange branch is connected to the first port of the second three-way valve assembly, the second port of the second three-way valve assembly is connected to the liquid outlet of the condenser of the second cold machine, the third port of the second three-way valve assembly is connected to the liquid inlet of the evaporator of the first cold machine, the first port of the first three-way valve assembly is connected to the second heat exchange branch, the second port of the first three-way valve assembly is connected to the liquid inlet of the condenser of the second cold machine, and the third port of the first three-way valve assembly is connected to the liquid outlet of the evaporator of the first cold machine. In the cold charging mode, the liquid outlet of the evaporator of the second cold machine is charged with cold to the liquid inlet of the cold storage tank. The liquid at the liquid outlet of the cold storage tank is supplied to the liquid inlet of the evaporator of the second cold machine via the first heat exchange branch. The liquid at the liquid outlet of the evaporator of the first cold machine is supplied to the liquid inlet of the terminal device and to the liquid inlet of the condenser of the second cold machine via the first three-way valve assembly. The liquid at the liquid outlet of the condenser of the second cold machine is mixed with the liquid at the liquid outlet of the terminal device via the second three-way valve assembly and then supplied to the liquid inlet of the evaporator of the first cold machine. In the cooling mode, the liquid at the liquid outlet of the cold storage tank is provided to the liquid inlet of the evaporator of the second cold machine via the first heat exchange branch. After the liquid in the second heat exchange branch undergoes heat exchange with the liquid in the first heat exchange branch, it is mixed with the liquid at the liquid outlet of the terminal device through the second three-way valve assembly, and then provided to the liquid inlet of the terminal device via the evaporator of the first cold machine, and flows into the second heat exchange branch via the first three-way valve assembly, thereby being provided to the liquid inlet of the condenser of the second cold machine.

6. The cold storage device according to claim 5, characterized in that The cooling mode includes a peak-shaving cooling mode and a continuous cooling mode. During the peak power period, when the liquid temperature at the liquid outlet of the second heat exchange branch is lower than a first set value, the controller controls the refrigeration system to enter the peak-shaving cooling mode. The controller controls the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet of the terminal device and the liquid temperature at the liquid outlet of the second heat exchange branch so that the temperature of the liquid inlet of the evaporator of the first cold machine is a second set value, and the temperature of the liquid outlet of the evaporator of the first cold machine is a third set value lower than the second set value, and the third set value is higher than the liquid outlet of the evaporator of the first cold machine. the first set value and being equal to the liquid temperature value of the liquid at the liquid inlet end of the terminal device; when the first chiller and the second chiller are both in the off state, and the liquid temperature at the liquid outlet end of the second heat exchange branch is lower than the liquid temperature value of the liquid at the liquid inlet end of the terminal device, the controller controls the refrigeration system to enter the continuous cooling mode, and the controller controls the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet end of the terminal device and the liquid temperature at the liquid outlet end of the second heat exchange branch so that the temperature at the liquid inlet end of the evaporator of the first chiller is equal to the liquid temperature value of the liquid inlet end of the terminal device; During off-peak hours, when the liquid temperature of the cold storage tank is lower than a preset temperature value, the controller controls the refrigeration system to enter the cold charging mode.

7. The cold storage device according to claim 6, characterized in that The controller also obtains the clippable peak power of the cold source system, and controls the valve opening of the second three-way valve assembly and the operating power of the cold source system according to the clippable peak power of the cold source system, the liquid temperature at the liquid outlet of the terminal device, and the liquid temperature at the liquid outlet of the second heat exchange branch, so that the temperature at the liquid inlet of the evaporator of the first cold machine is the second set value.

8. The cold storage device according to claim 1, wherein: The refrigeration system further includes a first pump unit and a second pump unit, wherein the first pump unit is connected to the first refrigeration circuit for driving the flow of liquid in the first refrigeration circuit, and the second pump unit is connected to the second refrigeration circuit for driving the flow of liquid in the second refrigeration circuit.

9. The cold storage device according to claim 1, wherein: The first cold machine is an air-cooled cold machine and also includes a fan for dissipating heat from the condenser of the first cold machine; or, the first cold machine is a liquid-cooled cold machine, and the cold source system also includes a third pump unit and a cooling tower, and the cooling tower, the condenser of the first cold machine, and the third pump unit constitute a cooling branch.

10. The cold storage device according to claim 3 or 6, characterized in that: The refrigeration system includes multiple terminal devices, multiple cold source systems, and multiple cold storage devices. The liquid inlets of the multiple cold source systems are respectively connected to the first liquid loop, the liquid outlets of the multiple terminal devices are respectively connected to the first liquid loop, the liquid outlets of the multiple cold source systems are respectively connected to the second liquid loop, and the liquid inlets of the multiple terminal devices are respectively connected to the second liquid loop.

11. The cold storage device according to claim 10, characterized in that Multiple cold storage devices are arranged in a cold source area close to the cold source system, and multiple cold storage devices are arranged in one or more load areas close to multiple terminal devices. Under the control of the controller, multiple cold storage devices in the cold source area are allowed to run the peak shaving cooling mode and / or the continuous cooling mode, and multiple cold storage devices in the load area only run the continuous cooling mode.

12. A refrigeration system, characterized in that: The refrigeration system includes the cold storage device according to any one of claims 1 to 11, a cold source system and the terminal equipment.

13. A control method for a refrigeration system, the refrigeration system comprising a cold source system, a terminal device, and a cold storage device, the cold source system comprising a first cold machine, the terminal device being used to cool a load, the cold storage device comprising a second cold machine and a cold storage tank, the evaporator of the first cold machine and the condenser of the second cold machine being connected via a valve assembly and forming a first refrigeration circuit with the terminal device, and the evaporator of the second cold machine and the cold storage tank forming a second refrigeration circuit; the control method comprising: In the cold charging mode, the first refrigeration circuit and the second refrigeration circuit are controlled to operate independently, the liquid outlet of the evaporator of the second cold machine charges cold to the liquid inlet of the cold storage tank, and the liquid outlet of the cold storage tank is supplied to the liquid inlet of the evaporator of the second cold machine. By controlling the valve body assembly, the liquid at the liquid outlet of the terminal device and the liquid at the liquid outlet of the condenser of the second cold machine are mixed, and then supplied to the liquid inlet of the terminal device and the liquid inlet of the condenser of the second cold machine via the evaporator of the first cold machine. In the cooling mode, by controlling the valve body assembly, the liquid at the liquid outlet end of the terminal device and the liquid at the liquid outlet end of the cold storage tank are mixed and then provided to the liquid inlet end of the terminal device through the evaporator of the first cold machine, and to the liquid inlet end of the condenser of the second cold machine through the valve body assembly.

14. The control method according to claim 13, characterized in that: The valve body assembly includes a first three-way valve assembly and a second three-way valve assembly, The liquid inlet end of the cold storage tank is connected to the liquid outlet end of the evaporator of the second cold machine and to the first port of the first three-way valve assembly; the liquid outlet end of the cold storage tank is connected to the liquid inlet end of the evaporator of the second cold machine and to the first port of the second three-way valve assembly; the second port of the first three-way valve assembly is connected to the liquid inlet end of the condenser of the second cold machine; the third port of the first three-way valve assembly is connected to the liquid outlet end of the evaporator of the first cold machine; the second port of the second three-way valve is connected to the liquid outlet end of the condenser of the second cold machine; and the third port of the second three-way valve is connected to the liquid inlet end of the evaporator of the first cold machine; In the cold charging mode, the liquid outlet of the evaporator of the second cold machine is charged with cold to the liquid inlet of the cold storage tank. The liquid at the liquid outlet of the cold storage tank is provided to the liquid inlet of the evaporator of the second cold machine. The liquid at the liquid outlet of the evaporator of the first cold machine is provided to the liquid inlet of the condenser of the second cold machine via the first three-way valve assembly. The liquid at the liquid outlet of the condenser of the second cold machine is mixed with the liquid at the liquid outlet of the terminal device via the second three-way valve and provided to the liquid inlet of the evaporator of the first cold machine. In the cooling mode, the liquid at the liquid outlet of the cold storage tank is mixed with the liquid at the liquid outlet of the terminal device after passing through the second three-way valve assembly and is then provided to the liquid inlet of the evaporator of the first cold machine. The liquid at the liquid outlet of the evaporator of the first cold machine is provided to the liquid inlet of the cold storage tank through the first three-way valve assembly.

15. The control method according to claim 14, characterized in that: The cooling mode includes a peak shaving cooling mode and a continuous cooling mode, and the control method further includes the following steps: Determine whether it is during peak power hours. If it is determined that the power supply is in the peak period, whether the liquid temperature of the cold storage tank is lower than a first set value is determined; if it is determined that the liquid temperature of the cold storage tank is lower than the first set value, the refrigeration system is controlled to enter the peak shaving and cooling mode; the valve opening of the second three-way valve assembly is controlled according to the liquid temperature of the liquid outlet of the terminal device and the liquid temperature of the liquid outlet of the cold storage tank so that the temperature of the liquid inlet of the evaporator of the first cold machine is a second set value, and the temperature of the liquid outlet of the evaporator of the first cold machine is a third set value lower than the second set value, and the third set value is higher than the first set value and equal to the liquid temperature of the liquid inlet of the terminal device; Determining whether both the first and second chillers are shut down and whether the liquid temperature at the liquid outlet of the cold storage tank is lower than the liquid temperature at the liquid inlet of the terminal device, if so, controlling the refrigeration system to enter the continuous cooling mode, and controlling the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet of the terminal device and the liquid temperature at the liquid outlet of the cold storage tank so that the temperature at the liquid inlet of the evaporator of the first chiller is equal to the liquid temperature at the liquid inlet of the terminal device; If it is determined that the power supply is in the off-peak period and the liquid temperature of the cold storage tank is lower than the preset temperature value, the controller controls the refrigeration system to enter the cold charging mode.

16. The control method according to claim 15, characterized in that: The control method also includes the following steps of obtaining the clippable peak power of the cold source system, and controlling the valve opening of the second three-way valve assembly and the operating power of the cold source system according to the clippable peak power of the cold source system, the liquid temperature at the liquid outlet of the terminal device, and the liquid temperature at the liquid outlet of the cold storage tank, so that the temperature at the liquid inlet end of the evaporator of the first cold machine is the second set value.

17. The control method according to claim 13, characterized in that: The valve body assembly includes a first three-way valve assembly and a second three-way valve assembly, and the cold storage device also includes a heat exchanger having a first heat exchange branch and a second heat exchange branch, the first heat exchange branch and the second heat exchange branch are arranged opposite to each other and are used to exchange heat with each other, and the first heat exchange branch is connected in series with the cold storage tank and the evaporator of the second cold machine and is located in the first refrigeration circuit; The liquid outlet of the second heat exchange branch is connected to the first port of the second three-way valve assembly, the second port of the second three-way valve assembly is connected to the liquid outlet of the condenser of the second cold machine, the third port of the second three-way valve assembly is connected to the liquid inlet of the evaporator of the first cold machine, the first port of the first three-way valve assembly is connected to the second heat exchange branch, the second port of the first three-way valve assembly is connected to the liquid inlet of the condenser of the second cold machine, and the third port of the first three-way valve assembly is connected to the liquid outlet of the evaporator of the first cold machine. In the cold charging mode, the liquid outlet of the evaporator of the second cold machine is controlled to charge cold water to the liquid inlet of the cold storage tank. The liquid at the liquid outlet of the cold storage tank is supplied to the liquid inlet of the evaporator of the second cold machine via the first heat exchange branch. The liquid at the liquid outlet of the evaporator of the first cold machine is supplied to the liquid inlet of the terminal device and to the liquid inlet of the condenser of the second cold machine via the first three-way valve assembly. The liquid at the liquid outlet of the condenser of the second cold machine is mixed with the liquid at the liquid outlet of the terminal device after passing through the second three-way valve and is supplied to the liquid inlet of the evaporator of the first cold machine. In the cooling mode, the liquid at the liquid outlet of the cold storage tank is controlled to be provided to the liquid inlet of the evaporator of the second cold machine via the first heat exchange branch. After the liquid in the second heat exchange branch is heat exchanged with the liquid in the first heat exchange branch, it is mixed with the liquid at the liquid outlet of the terminal device through the second three-way valve assembly, and then provided to the liquid inlet of the terminal device via the evaporator of the first cold machine, and flows into the second heat exchange branch via the first three-way valve assembly, thereby being provided to the liquid inlet of the condenser of the second cold machine.

18. The control method according to claim 17, characterized in that: The cooling mode includes a peak shaving cooling mode and a continuous cooling mode, and the control method further includes the following steps: Steps for determining whether it is during peak power period, If it is determined that the power supply is within the peak period, whether the liquid temperature at the liquid outlet of the cold storage tank is lower than a first set value is determined; if it is determined that the liquid temperature at the liquid outlet of the second heat exchange branch is lower than the first set value, the refrigeration system is controlled to enter the peak shaving and cooling mode; the controller controls the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet of the terminal device and the liquid temperature at the liquid outlet of the second heat exchange branch so that the temperature at the liquid inlet of the evaporator of the first chiller is a second set value, and the temperature at the liquid outlet of the evaporator of the first chiller is a third set value lower than the second set value, and the third set value is higher than the first set value and equal to the liquid temperature at the liquid inlet of the terminal device; Determine whether both the first and second chillers are shut down, and whether the liquid temperature at the liquid outlet of the second heat exchange branch is lower than the liquid temperature at the liquid inlet of the terminal device. If so, control the refrigeration system to enter the continuous cooling mode, and control the valve opening of the second three-way valve assembly according to the liquid temperature at the liquid outlet of the terminal device and the liquid temperature at the liquid outlet of the second heat exchange branch so that the temperature at the liquid inlet of the evaporator of the first chiller is equal to the liquid temperature at the liquid inlet of the terminal device. If it is determined that the power supply is in the off-peak period and the liquid temperature of the cold storage tank is lower than the preset temperature value, the controller controls the refrigeration system to enter the cold charging mode.

19. The control method according to claim 18, characterized in that: The control method also includes the following steps of obtaining the clippable peak power of the cold source system, and controlling the valve opening of the second three-way valve assembly and the operating power of the cold source system according to the clippable peak power of the cold source system, the liquid temperature at the liquid outlet of the terminal device, and the liquid temperature at the liquid outlet of the second heat exchange branch, so that the temperature at the liquid inlet of the evaporator of the first cold machine is the second set value.

20. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method according to any one of claims 13 to 19 is implemented.

Images