Refrigeration mode switching method and device, electronic equipment and program product

Abstract

The invention discloses a refrigeration mode switching method and device, electronic equipment and a program product, and relates to the field of financial science and technology, and the switching method comprises the steps that under the condition that it is detected that the refrigeration mode of a cooling circulation system is a mechanical refrigeration mode, the wet bulb temperature of the external environment of a data center is monitored; under the condition that it is monitored that the wet bulb temperature is smaller than a preset natural cooling commissioning temperature threshold value within a first preset duration, the refrigeration mode is switched to a natural cooling mode, and a refrigeration process in the natural cooling mode is started; and when it is monitored that the wet bulb temperature is larger than a preset natural cooling quit temperature threshold value within a second preset duration, or the water supply temperature of chilled water in the natural cooling mode is larger than a preset water supply temperature threshold value within a third preset duration, the refrigeration process is stopped, and the refrigeration mode is switched to the mechanical refrigeration mode. The technical problem that the energy utilization rate is low due to the fact that the refrigeration modes cannot be smoothly switched in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of financial technology, in particular to a switching method and device of refrigeration mode, electronic equipment and program product. BACKGROUND

[0002] Mechanical refrigeration is a refrigeration method based on thermodynamic principles, which promotes the state and energy change of refrigerant through mechanical or thermodynamic action to form a refrigeration cycle. Mechanical refrigeration can be divided into two types of steam refrigeration and gas refrigeration according to the way of realizing the refrigeration cycle. In the steam refrigeration method, the steam of the working medium is first compressed to a relatively high pressure, cooled by an external cooling medium (cooling water or air) to change into a liquid, and then passes through a throttle valve to reduce the pressure and temperature. The low-pressure liquid working medium is evaporated in the evaporator to absorb heat and produce cold.

[0003] Natural cooling is a method of using low temperature in the environment as a cold source. By adding a plate heat exchanger in the air conditioning water system, the cooling water and the chilled water are heat exchanged. In the transition season, the outdoor low-temperature air is used as a natural cold source, and the cooling tower is used for heat dissipation to produce cooling water with lower temperature. The plate heat exchanger is used to cool the chilled water to achieve the purpose of cooling.

[0004] Currently, data centers generally use a double-path system for refrigeration. The water-cooled host compresses the refrigerant into a liquid state by a compressor and sends it to the evaporator for evaporation. The chilled water circulation system sends normal temperature water into the evaporator coil through the chilled water pump to exchange heat with the refrigerant. The refrigerant absorbs heat to cool the normal temperature water into low-temperature chilled water. The chilled water is sent to the end cooling coil under the action of the chilled water pump to absorb the heat generated in the machine room, achieving the purpose of reducing the temperature in the machine room. However, the existing refrigeration scheme cannot fully utilize the low-temperature outdoor air for refrigeration in the transition season, and the refrigeration efficiency and energy efficiency ratio of the water chiller are low, thereby reducing the energy efficiency and economy of the entire system.

[0005] At present, there is no effective solution to the above problems. SUMMARY

[0006] The embodiments of the present application provide a switching method and device of refrigeration mode, electronic equipment and program product to at least solve the technical problem of low energy utilization rate caused by the inability to smoothly switch the refrigeration mode in the related art.

[0007] According to an aspect of the embodiments of the present application, a switching method of a refrigeration mode is provided, applied to a data center cooling system, the data center cooling system at least comprising a cooling circulation system, the switching method comprising: in a case where it is detected that the refrigeration mode of the cooling circulation system is a mechanical refrigeration mode, monitoring a wet-bulb temperature of an external environment of the data center, wherein the wet-bulb temperature is a temperature reached by air evaporative cooling under a preset humidity; in a case where it is monitored that the wet-bulb temperature is less than a preset natural cooling commissioning temperature threshold value within a first preset time length, switching the refrigeration mode to a natural cooling mode, and starting a refrigeration process in the natural cooling mode; in a case where it is monitored that the wet-bulb temperature is greater than a preset natural cooling exit temperature threshold value within a second preset time length, or a supply water temperature of chilled water in the natural cooling mode is greater than a preset supply water temperature threshold value within a third preset time length, stopping the refrigeration process, and switching the refrigeration mode to the mechanical refrigeration mode, wherein the supply water temperature is a temperature obtained after the chilled water is cooled.

[0008] Further, the step of switching the refrigeration mode to the natural cooling mode and starting the refrigeration process in the natural cooling mode comprises: determining a first return water temperature threshold value of a return water temperature of cooling water, wherein the return water temperature is a temperature obtained after the cooling water absorbs heat; determining a first supply water temperature threshold value of a supply water temperature of chilled water; starting the refrigeration process in the natural cooling mode according to the first return water temperature threshold value and the first supply water temperature threshold value.

[0009] Further, the cooling circulation system in the mechanical refrigeration mode at least comprises a cooling tower, a cold storage tank, and a refrigeration unit, the refrigeration unit at least comprising a water chiller, a chilled water pump, and a cooling water pump, after the first supply water temperature threshold value of the supply water temperature of the chilled water is determined, the switching method further comprises: starting a fan of the cooling tower; stopping a target refrigeration unit and starting a chilled water pump of another refrigeration unit, wherein the target refrigeration unit is a refrigeration unit currently used by the cooling circulation system, and the another refrigeration unit is a refrigeration unit other than the target refrigeration unit; adjusting an isolation electric valve state of the cold storage tank, wherein the cold storage tank stores the chilled water, and the isolation electric valve state is used to control whether the cold storage tank participates in circulation of the chilled water.

[0010] Further, the cooling circulation system in the natural cooling mode comprises at least a plate heat exchanger, and the refrigeration process comprises at least starting a cooling water pump of the plate heat exchanger, starting a chilled water pump of the plate heat exchanger, and adjusting a state of an isolation electric valve of the cold storage tank. According to the first return water temperature threshold and the first supply water temperature threshold, the starting of the refrigeration process in the natural cooling mode comprises: opening an electric valve on the cooling water side of the plate heat exchanger, and starting a corresponding cooling water pump of the plate heat exchanger, wherein the cooling water pump is used to drive the circulation of cooling water; in the case that the return water temperature of the cooling water is less than the first return water temperature threshold within a fourth preset time length, opening an electric valve on the chilled water side of the plate heat exchanger, and starting a corresponding chilled water pump of the plate heat exchanger, wherein the chilled water pump is used to drive the circulation of chilled water; and in the case that the supply water temperature of the chilled water is less than the first supply water temperature threshold within a fifth preset time length, stopping the chilled water pumps of other refrigeration units, and adjusting the state of the isolation electric valve to obtain a target state of the isolation electric valve of the cold storage tank.

[0011] Further, the cooling circulation system comprises at least a temperature difference bypass proportional control valve corresponding to an operating temperature value. The stopping of the refrigeration process and the switching of the refrigeration mode to the mechanical refrigeration mode comprise: calculating the working time length of all the chilled water pumps, and starting the refrigeration unit in which the chilled water pump with the minimum working time length is located; stopping the chilled water pump on the chilled water side of the plate heat exchanger, and closing the electric valve on the chilled water side of the plate heat exchanger; stopping the fan of the cooling tower of the cooling circulation system; stopping the cooling water pump on the cooling water side of the plate heat exchanger, and closing the electric valve on the cooling water side of the plate heat exchanger; determining a second return water temperature threshold of the cooling water; and switching the refrigeration mode to the mechanical refrigeration mode according to the second return water temperature threshold and the operating temperature value.

[0012] Further, the switching of the refrigeration mode to the mechanical refrigeration mode according to the second return water temperature threshold and the operating temperature value comprises: in the case that the second return water temperature threshold is less than the operating temperature value, controlling the opening and closing of the temperature difference bypass proportional control valve to obtain an initial opening and closing ratio, wherein the initial opening and closing ratio is used to adjust the flow of the cooling water; determining a second supply water temperature threshold of the chilled water, wherein the second supply water temperature threshold is a supply water temperature threshold of the chilled water in the mechanical refrigeration mode; and in the case that the supply water temperature of the chilled water is greater than or equal to the second supply water temperature threshold within a sixth preset time length, switching the refrigeration mode to the mechanical refrigeration mode.

[0013] Further, after the opening and closing of the temperature difference bypass proportional control valve is controlled to obtain the initial opening and closing ratio, the method further comprises: starting a cooling water pump of the refrigeration unit, and obtaining a flow signal of the cooling water; starting a chiller of the refrigeration unit when the flow signal is greater than a preset flow threshold; and adjusting the initial opening and closing ratio of the temperature difference bypass proportional control valve to obtain a target opening and closing ratio, and starting a cooling tower of the cooling circulation system when the second return water temperature threshold is greater than or equal to the operating temperature value.

[0014] According to another aspect of the embodiments of the present application, a switching device for a refrigeration mode is also provided, which is applied to a data center cooling system, and the data center cooling system at least comprises: a cooling circulation system, comprising: a first monitoring unit, configured to monitor a wet bulb temperature of an external environment of the data center when it is detected that the refrigeration mode of the cooling circulation system is a mechanical refrigeration mode, wherein the wet bulb temperature is a temperature reached by air evaporative cooling under a preset humidity; a first switching unit, configured to switch the refrigeration mode to a natural cooling mode and start a refrigeration process in the natural cooling mode when it is monitored that the wet bulb temperature is less than a preset natural cooling commissioning temperature threshold within a first preset time length; and a second switching unit, configured to stop the refrigeration process and switch the refrigeration mode to the mechanical refrigeration mode when it is monitored that the wet bulb temperature is greater than a preset natural cooling exit temperature threshold within a second preset time length, or a supply water temperature of chilled water in the natural cooling mode is greater than a preset supply water temperature threshold within a third preset time length, wherein the supply water temperature is a temperature obtained after the chilled water is cooled.

[0015] Further, the first switching unit comprises: a first determination module, configured to determine a first return water temperature threshold of a return water temperature of the cooling water, wherein the return water temperature is a temperature obtained after the cooling water absorbs heat; a second determination module, configured to determine a first supply water temperature threshold of a supply water temperature of the chilled water; and a first starting module, configured to start the refrigeration process in the natural cooling mode according to the first return water temperature threshold and the first supply water temperature threshold.

[0016] Further, the switching device for the refrigeration mode comprises: a second starting module, configured to start a fan of the cooling tower after the first supply water temperature threshold of the supply water temperature of the chilled water is determined; a first stopping module, configured to stop a target refrigeration unit and start a chilled water pump of another refrigeration unit, wherein the target refrigeration unit is a refrigeration unit currently used by the cooling circulation system, and the another refrigeration unit is a refrigeration unit other than the target refrigeration unit; and a first adjustment module, configured to adjust a state of an isolation electric valve of a cold storage tank, wherein the cold storage tank stores the chilled water, and the state of the isolation electric valve is used to control whether the cold storage tank participates in circulation of the chilled water.

[0017] Further, the first starting module comprises: a first starting submodule for opening the electric valve of the cooling water side of the plate heat exchanger and starting the cooling water pump corresponding to the plate heat exchanger, wherein the cooling water pump is used for driving the circulation of cooling water; a second starting submodule for opening the electric valve of the chilled water side of the plate heat exchanger and starting the chilled water pump corresponding to the plate heat exchanger in the case that the return water temperature of the cooling water is less than the first return water temperature threshold value within the fourth preset time length; a first adjusting submodule for stopping the chilled water pump of the other refrigeration unit and adjusting the isolation electric valve state to obtain the target isolation electric valve state of the cold storage tank in the case that the supply water temperature of the chilled water is less than the first supply water temperature threshold value within the fifth preset time length.

[0018] Further, the second switching unit comprises: a first calculating module for calculating the working time length of all the chilled water pumps and starting the refrigeration unit in which the chilled water pump with the minimum working time length is located; a first closing module for stopping the chilled water pump of the chilled water side of the plate heat exchanger and closing the electric valve of the chilled water side of the plate heat exchanger; a second stopping module for stopping the fan of the cooling tower of the cooling circulation system; a second closing module for stopping the cooling water pump of the cooling water side of the plate heat exchanger and closing the electric valve of the cooling water side of the plate heat exchanger; a third determining module for determining the second return water temperature threshold value of the cooling water; and a first switching module for switching the refrigeration mode to the mechanical refrigeration mode according to the second return water temperature threshold value and the operation temperature value.

[0019] Further, the first switching module comprises: a first control submodule for controlling the switch of the temperature difference bypass proportional control valve to obtain the initial switch ratio in the case that the second return water temperature threshold value is less than the operation temperature value, wherein the initial switch ratio is used for adjusting the flow of the cooling water; a first determining submodule for determining the second supply water temperature threshold value of the chilled water, wherein the second supply water temperature threshold value is the supply water temperature threshold value of the chilled water in the mechanical refrigeration mode; and a first switching submodule for switching the refrigeration mode to the mechanical refrigeration mode in the case that the supply water temperature of the chilled water is greater than or equal to the second supply water temperature threshold value within the sixth preset time length.

[0020] Further, the switching device of the refrigeration mode further comprises: a third starting module for starting the cooling water pump of the refrigeration unit and obtaining the flow signal of the cooling water after the switch of the temperature difference bypass proportional control valve is controlled to obtain the initial switch ratio; a fourth starting module for starting the water chiller of the refrigeration unit in the case that the flow signal is greater than the preset flow threshold value; and a second adjusting module for adjusting the initial switch ratio of the temperature difference bypass proportional control valve to obtain the target switch ratio and starting the cooling tower of the cooling circulation system in the case that the second return water temperature threshold value is greater than or equal to the operation temperature value.

[0021] According to another aspect of the embodiments of the present application, a computer program product is also provided, including a nonvolatile computer readable storage medium, the nonvolatile computer readable storage medium storing a computer program, the computer program being executed by a processor to implement the switching method of any one of the refrigeration modes.

[0022] According to another aspect of the embodiments of the present application, an electronic device is also provided, including one or more processors and a memory, the memory being configured to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the switching method of any one of the refrigeration modes.

[0023] In the present application, in the case that it is detected that the refrigeration mode of the cooling circulation system is the mechanical refrigeration mode, the wet bulb temperature of the external environment of the data center is monitored; in the case that it is monitored that the wet bulb temperature is less than the preset natural cooling commissioning temperature threshold value within a first preset time length, the refrigeration mode is switched to the natural cooling mode, and the refrigeration process in the natural cooling mode is started; in the case that it is monitored that the wet bulb temperature is greater than the preset natural cooling exit temperature threshold value within a second preset time length, or the supply water temperature of the chilled water in the natural cooling mode is greater than the preset supply water temperature threshold value within a third preset time length, the refrigeration process is stopped, and the refrigeration mode is switched to the mechanical refrigeration mode, thereby solving the technical problem of low energy utilization rate caused by the inability to smoothly switch the refrigeration mode in the related art.

[0024] In the present application, while the mechanical refrigeration mode is running, the wet bulb temperature of the external environment of the data center is continuously monitored, in the case that the monitored wet bulb temperature continuously falls below the preset natural cooling commissioning temperature threshold value within a first preset time length, i.e., the natural cooling condition is met, the existing refrigeration mode can be automatically switched from the mechanical refrigeration to the natural cooling mode, and the natural cooling process is activated; after the natural cooling mode is started, the change of the wet bulb temperature and the actual supply water temperature of the chilled water are continuously monitored, if the wet bulb temperature continuously exceeds the preset natural cooling exit temperature threshold value within a second preset time length, or the supply water temperature of the chilled water continuously exceeds the preset supply water temperature threshold value within a third preset time length, the natural cooling condition is no longer met, the system will automatically stop the natural cooling process, and switch back to the mechanical refrigeration mode, thereby realizing the intelligent and smooth switching between the mechanical refrigeration and the natural cooling mode, ensuring that the cooling demand of the data center in each season is met, and effectively utilizing the cooling potential of the outdoor low-temperature air in the transition season, so as to improve the overall energy efficiency of the cooling system, and reduce the operation cost of the data center. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application. In the drawings:

[0026] Figure 1 A hardware structure block diagram of a computer terminal (or mobile device) for implementing the switching method of the refrigeration mode is shown;

[0027] Figure 2 is a flow chart of the switching method of the refrigeration mode according to Embodiment 1 of the present application;

[0028] Figure 3 is a flow chart of an optional natural cooling start according to Embodiment 1 of the present application;

[0029] Figure 4 is a flow chart of an optional natural cooling exit according to Embodiment 1 of the present application;

[0030] Figure 5 is a schematic diagram of an optional switching device of the refrigeration mode according to Embodiment of the present application;

[0031] Figure 6 is a structure block diagram of an electronic device according to Embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] It should be noted that the information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) collected and related to the present application are all information and data authorized by the user or authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of related data comply with relevant laws, regulations and standards in the relevant region, necessary security measures are taken, public order and good customs are not violated, and appropriate operation portals are provided for users to choose authorization or refusal. For example, the system and related users or institutions are provided with an interface, and before obtaining the relevant information, the interface needs to send a request to the aforementioned user or institution, and after receiving the consent information feedback from the aforementioned user or institution, the relevant information is obtained.

[0035] In the present application, the suitable operating state of the refrigeration system can be determined according to the working condition, the automatic switching of the control mode of the data center refrigeration system is realized, when the outdoor temperature is high, mechanical refrigeration is used to ensure that the heat load of the data center is timely and stably taken away, and the purpose of reducing the temperature of the machine room is achieved, when the outdoor wet-bulb temperature is low, that is, the switching condition of natural cooling is met, the natural cooling mode is automatically switched, the low-temperature air is used as a cold source to cool the machine room, the refrigeration energy efficiency ratio is improved, and the energy consumption of the data center is effectively reduced.

[0036] The present application will be described in detail below in conjunction with various embodiments.

[0037] Embodiment 1

[0038] According to the embodiments of the present application, an embodiment of a switching method of a refrigeration mode is also provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a group of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that here.

[0039] The method embodiment provided by the embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 A hardware structure block diagram of a computer terminal (or mobile device) for implementing a switching method of a refrigeration mode is shown. As shown in Figure 1 The computer terminal 10 (or mobile device) can include one or more (processors) 1002, memory 1004, storage 1006, input device 1008, and output device 1010, as shown in Figure 1102a, 102b, ..., 102n are used to illustrate) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 104 for storing data, and a transmission device 106 for communication functions. In addition, it may also include: a display, a keyboard, a cursor control device, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera, wherein the network interface may be connected to a wired and / or wireless network. It will be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown.

[0040] It should be noted that the one or more processors 102 and / or other data processing circuits described above may generally be referred to herein as "data processing circuitry". The data processing circuitry may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuitry may be a single independent processing module, or may be incorporated in whole or in part into any of the other components of the computer terminal 10 (or mobile device). As described in the embodiments of the present application, the data processing circuitry serves as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0041] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the switching method of the cooling mode in the embodiment of the present application. The processor 102 executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, realizing the switching method of the cooling mode mentioned above. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include a memory remotely located relative to the processor 102, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0042] The transmission device 106 is configured to receive or send data via a network. The network can include a wireless network provided by a communication provider of the computer terminal 10. In an example, the transmission device 106 includes a network interface controller (NIC) configured to connect to other network devices via a base station to communicate with the Internet. In an example, the transmission device 106 can be a radio frequency (RF) module configured to communicate with the Internet via a wireless manner.

[0043] The display can be a liquid crystal display (LCD) in a touch screen manner, which enables a user to interact with a user interface of the computer terminal 10 (or a mobile device).

[0044] In the above operating environment, the present application provides a method for switching a refrigeration mode, as shown in Figure 2 Figure 2 is a flowchart of the method for switching the refrigeration mode according to the embodiment 1 of the present application, as shown in Figure 2 The method includes the following steps:

[0045] In step S201, when it is detected that the refrigeration mode of the cooling circulation system is a mechanical refrigeration mode, the wet-bulb temperature of the external environment of the data center is monitored, wherein the wet-bulb temperature is a temperature reached by air evaporative cooling under a preset humidity.

[0046] In the embodiment of the present application, when it is detected that the refrigeration mode of the cooling circulation system (referring to a water circulation refrigeration system in the data center for maintaining the operating temperature of the equipment within a suitable range, including but not limited to a chilled water circulation system, a cooling water circulation system, a refrigerant circulation system, and the like) is a mechanical refrigeration mode, the wet-bulb temperature (a temperature reached by air evaporative cooling under a preset humidity, for example, the preset humidity is 50%, and the monitored outdoor wet-bulb temperature is 15℃) of the external environment of the data center can be measured by an outdoor temperature sensor.

[0047] In step S202, when it is monitored that the wet-bulb temperature is less than a preset natural cooling commissioning temperature threshold value within a first preset time length, the refrigeration mode is switched to a natural cooling mode, and a refrigeration process in the natural cooling mode is started.

[0048] ​In the embodiment of the present application, in the case that the monitored wet-bulb temperature is less than the preset natural cooling commissioning temperature threshold within the first preset time length (i.e. a temperature standard for determining whether to start the natural cooling mode), the system pops up a natural cooling available pop-up prompt, automatically switches the switch state of the natural cooling, and the system interface color changes as an identifier. At this time, the refrigeration mode enters the natural cooling mode, activates the natural cooling process (i.e. the refrigeration process in the natural cooling mode), and uses outdoor low-temperature air as a cold source to improve the energy efficiency of the data center cooling system.

[0049] For example, if the monitored wet-bulb temperature is continuously lower than the specified natural cooling commissioning temperature threshold (for example, 8℃), and this state is maintained for at least 3 hours (the first preset time length), the system will automatically turn off the running mechanical refrigeration unit, start the cooling tower and the plate heat exchanger, and make the cooling water and the chilled water exchange heat through the plate heat exchanger, so as to realize the mode switching from mechanical refrigeration to natural cooling.

[0050] In step S203, in the case that the monitored wet-bulb temperature is greater than the preset natural cooling exit temperature threshold within the second preset time length, or the supply water temperature of the chilled water in the natural cooling mode is greater than the preset supply water temperature threshold within the third preset time length, the refrigeration process is stopped, and the refrigeration mode is switched to the mechanical refrigeration mode, wherein the supply water temperature is the temperature of the chilled water after being cooled.

[0051] In the embodiment of the present application, in the case that the monitored wet-bulb temperature is greater than the preset natural cooling exit temperature threshold within the second preset time length (a temperature standard for determining whether to exit the natural cooling mode and return to the mechanical refrigeration mode), or the supply water temperature of the chilled water in the natural cooling mode is greater than the preset supply water temperature threshold (a preset supply water temperature threshold) within the third preset time length, the refrigeration process is stopped, and the refrigeration mode is switched to the mechanical refrigeration mode. By setting the preset time length (such as the second preset time length and the third preset time length), the mode switching caused by instantaneous temperature fluctuation can be avoided.

[0052] In summary, when the system detects that the current is in the mechanical refrigeration mode and the external wet-bulb temperature is continuously lower than the natural cooling commissioning temperature threshold, the natural cooling mode is automatically started, the low-temperature outdoor air is used as a natural cold source, the energy efficiency ratio is improved, and the energy consumption is reduced. At the same time, once the wet-bulb temperature exceeds the preset natural cooling exit temperature threshold, or the supply water temperature of the chilled water in the natural cooling mode is continuously higher than the preset supply water temperature threshold, the system will stop the natural cooling process and smoothly switch back to the mechanical refrigeration mode. Through intelligent monitoring of the external wet-bulb temperature of the data center and dynamically switching the refrigeration mode, the efficient combination of mechanical refrigeration and natural cooling in the transition season is realized, the stability and safety of the data center cooling effect are ensured, and the technical problem of low energy utilization rate caused by the inability to smoothly switch the refrigeration mode in the related art is solved.

[0053] In order to achieve fine and efficient energy management, in the switching method of refrigeration mode provided in Embodiment 1 of the present application, a first return water temperature threshold of the return water temperature of cooling water is determined, wherein the return water temperature is the temperature of the cooling water after absorbing heat; a first supply water temperature threshold of the supply water temperature of chilled water is determined; and a refrigeration process in the natural cooling mode is started according to the first return water temperature threshold and the first supply water temperature threshold.

[0054] In the embodiment of the present application, by determining the first return water temperature threshold of the return water temperature of cooling water (the temperature of the cooling water after absorbing heat) and the first supply water temperature threshold of the supply water temperature of chilled water (the temperature that the chilled water can reach before cooling the computer room), the system can automatically start the refrigeration process in the natural cooling mode when the specific temperature condition is met.

[0055] In the embodiment of the present application, the return water temperature set value (i.e. the first return water temperature threshold) of the cooling water is adjusted from the set value (such as Tc) in the mechanical refrigeration mode to the set value (such as Tfc) in the natural cooling mode, and the supply water temperature set value (i.e. the first supply water temperature threshold) of the chilled water is adjusted from the set value (such as Tch) in the mechanical refrigeration mode to the set value (such as Tfch) in the natural cooling mode, and then the refrigeration process in the natural cooling mode is started according to the first return water temperature threshold and the first supply water temperature threshold, so as to achieve the purpose of energy saving and emission reduction and improving energy utilization efficiency.

[0056] The cooling circulating system in the mechanical refrigeration mode at least includes a cooling tower, a cold storage tank and a refrigeration unit, the refrigeration unit at least includes a water chiller, a chilled water pump and a cooling water pump, in order to achieve smooth and efficient switching between the mechanical refrigeration mode and the natural cooling mode, in the switching method of refrigeration mode provided in Embodiment 1 of the present application, the fan of the cooling tower is started; the chilled water pump of the other refrigeration unit is started while the target refrigeration unit is stopped, wherein the target refrigeration unit is the refrigeration unit currently used by the cooling circulating system, and the other refrigeration unit is the refrigeration unit other than the target refrigeration unit; and the state of the isolation electric valve of the cold storage tank is adjusted, wherein the cold storage tank stores chilled water, and the state of the isolation electric valve is used to control whether the cold storage tank participates in the circulation of the chilled water.

[0057] In the embodiment of the present application, first, the fan of the cooling tower is started, the cooling tower cools the cooling water by spraying the cooling water into the filler, uses the air flow to take away the heat in the water, realizes the temperature reduction of the cooling water, through the full frequency operation of the fan, accelerates the air circulation, uses the low temperature air outside to realize the indirect cooling of the cooling water. Then, the system will stop the refrigeration unit currently running (i.e. the target refrigeration unit), and at the same time, activate the chilled water pump of the other refrigeration units (i.e. the refrigeration units in standby state), by starting the chilled water pump of these refrigeration units, the chilled water can be circulated in the system, even in the state without mechanical refrigeration unit working, the cooling effect can also be realized through the natural cooling process. Then, the system will adjust the isolation electric valve state of the cold storage tank, change the cold storage tank from parallel connection to series connection into the chilled water supply main pipe, release the low temperature chilled water, enhance the effect of natural cooling, realize the automatic and smooth conversion from mechanical refrigeration to natural cooling mode.

[0058] The cooling circulation system in the natural cooling mode at least comprises a plate heat exchanger, and the refrigeration process at least comprises starting the cooling water pump of the plate heat exchanger, starting the chilled water pump of the plate heat exchanger, and adjusting the isolation electric valve state of the cold storage tank. In order to more effectively use the low temperature outside as a cold source, in the switching method of the refrigeration mode provided in Embodiment 1 of the present application, the electric valve on the cooling water side of the plate heat exchanger is opened, and the cooling water pump corresponding to the plate heat exchanger is started, wherein the cooling water pump is used to push the circulation of the cooling water; in the case that the return water temperature of the cooling water is less than the first return water temperature threshold value within a fourth preset time length, the electric valve on the chilled water side of the plate heat exchanger is opened, and the chilled water pump corresponding to the plate heat exchanger is started, wherein the chilled water pump is used to push the circulation of the chilled water; in the case that the supply water temperature of the chilled water is less than the first supply water temperature threshold value within a fifth preset time length, the chilled water pump of the other refrigeration units is stopped, and the isolation electric valve state is adjusted to obtain the target isolation electric valve state of the cold storage tank.

[0059] In the embodiment of the present application, in the natural cooling mode, first, the electric valve on the cooling water side of the plate heat exchanger is opened, and the cooling water pump corresponding to the plate heat exchanger is started, the cooling water pump is responsible for pushing the circulation of the physical cooling water in the system, the external low temperature air and the cooling water realize indirect heat exchange through the plate heat exchanger, the cooling water after heat dissipation of the cooling tower is further cooled, and preparation is made for the subsequent chilled water cooling, at this time, the chilled water pump of the plate heat exchanger is not started, in the case that the return water temperature of the cooling water is less than the first return water temperature threshold value within a fourth preset time length (such as tfc), the electric valve on the chilled water side of the plate heat exchanger is opened, and the chilled water pump corresponding to the plate heat exchanger is started, so as to promote the circulation of the chilled water.

[0060] In the embodiment of the present application, in the case that the supply temperature of chilled water is less than the first supply temperature threshold (such as Tfch) within the fifth preset time length (such as tfch), the chilled water pump of the other refrigeration unit is stopped, and the isolation electric valve state is adjusted to obtain the target isolation electric valve state of the cold storage tank (i.e. from series to parallel, the cold storage tank exits the chilled water supply main pipe, and the supply of low-temperature chilled water is stopped), the opening and closing of the electric valves on both sides of the fine control plate heat exchanger, the starting time of the chilled water pump and the cooling water pump, and the timely adjustment of the isolation electric valve state of the cold storage tank are adjusted, so that the optimization management of the cooling water and chilled water circulation process in the natural cooling mode is realized, and at the same time, the chilled water pump of the other refrigeration unit is stopped.

[0061] Optionally, the operation frequency of the chilled water pump of the cooling circulation system in the natural cooling mode is adjusted according to the chilled water supply and return water main pressure difference, and the adjustment strategy is the same as that in the mechanical refrigeration mode, that is, the supply and return water main pressure difference is low, the chilled water pump is increased in frequency, and the pressure difference is high, the chilled water pump is decreased in frequency.

[0062] Figure 3 is an optional flow chart of starting natural cooling according to Embodiment 1 of the present application, such as Figure 3As shown, it is determined whether the outdoor average wet-bulb temperature is continuously lower than the natural cooling start-up set temperature. When the outdoor average wet-bulb temperature is continuously lower than the natural cooling start-up set temperature (that is, when the wet-bulb temperature is monitored to be lower than the preset natural cooling commissioning temperature threshold within the first preset time period), the natural cooling mode is started, and the return water temperature setting value of the single-circuit chilled water is adjusted from the setting value in the mechanical cooling mode to the setting value in the natural cooling mode (that is, the first return water temperature threshold for determining the return water temperature of the cooling water), and the supply water temperature setting value of the single-circuit chilled water is adjusted from the setting value in the mechanical cooling mode to the setting value in the natural cooling mode (that is, the first supply water temperature threshold for determining the supply water temperature of the chilled water), the single-circuit cooling tower is operated at full frequency, the single-circuit refrigeration unit in use is stopped, and then, any standby chilled water pump of the remaining single-circuit refrigeration units is started, and the state of the single-circuit cold storage tank isolation valve is switched, and the chilled water supply main is connected in series to release low-temperature chilled water. Afterwards, open the electric valve on the cooling water side of the plate heat exchanger, start the corresponding cooling water pump, and judge whether the return temperature of the single-channel cooling water is continuously lower than the temperature setting value in the natural cooling mode. When the return temperature of the single-channel cooling water is continuously lower than the temperature setting value in the natural cooling mode (that is, when the return temperature of the cooling water is monitored to be lower than the first return temperature threshold within the fourth preset time length), open the electric valve on the chilled water side of the plate heat exchanger, and start the corresponding chilled water pump. Finally, judge whether the supply temperature of the single-channel chilled water is continuously lower than the temperature setting value in the natural cooling mode. When it is judged that the supply temperature of the single-channel chilled water is continuously lower than the temperature setting value in the natural cooling mode (that is, when the supply temperature of the chilled water is monitored to be lower than the first supply temperature threshold within the fifth preset time length), switch the state of the single-channel cold storage tank isolation electric valve, and the chilled water pumps of the other refrigeration units stop running. The operating frequency of the chilled water pump is dynamically adjusted according to the pressure difference between the chilled water supply and return mains.

[0063] The cooling circulation system at least includes: a temperature difference bypass proportional control valve, and the temperature difference bypass proportional control valve corresponds to an operating temperature value. In order to smoothly exit from the natural cooling mode and return to the mechanical refrigeration mode, in the refrigeration mode switching method provided in Example 1 of the present application, the working hours of all chilled water pumps are calculated, and the refrigeration unit where the chilled water pump with the minimum working time is located is started; the chilled water pump on the chilled water side of the plate heat exchanger is stopped, and the electric valve on the chilled water side of the plate heat exchanger is closed; the fan of the cooling tower of the cooling circulation system is stopped; the cooling water pump on the cooling water side of the plate heat exchanger is stopped, and the electric valve on the cooling water side of the plate heat exchanger is closed; the second return water temperature threshold of the cooling water is determined; and the refrigeration mode is switched to the mechanical refrigeration mode based on the second return water temperature threshold and the operating temperature value.

[0064] In the embodiment of the present application, the working time of all chilled water pumps is calculated, and the refrigeration unit in which the chilled water pump with the minimum working time is located is selected as the priority start object, so as to balance the use frequency of each refrigeration unit, prolong the service life of the equipment, and improve the overall operation efficiency.

[0065] After that, the chilled water pump on the chilled water side of the plate heat exchanger is stopped, the electric valve on the chilled water side of the plate heat exchanger is closed, the operation of the fan of the cooling tower is stopped to avoid unnecessary waste of electric energy, the cooling water pump on the cooling water side of the plate heat exchanger is stopped, and the electric valve on the cooling water side of the plate heat exchanger is closed to ensure that the circulation of cooling water is only carried out inside the water chiller unit, improve the operation efficiency of the mechanical refrigeration mode, at this time, the return water temperature of the cooling water is lower than the operating temperature value of the temperature difference bypass proportional control valve of the cooling water inlet and return water main, the opening of the temperature difference bypass proportional control valve of the cooling water inlet and return water main can be automatically adjusted to dynamically adjust the flow of the cooling water, ensure that the cooling water flow is slightly greater than the cooling water flow alarm threshold of the water chiller unit (i.e. a preset flow threshold, a safety threshold set to ensure that the cooling water flow inside the water chiller unit is maintained above the minimum requirement), and keep stable.

[0066] The return water temperature setting value of the cooling water is adjusted from the setting value in the natural cooling mode to the setting value in the mechanical refrigeration mode (i.e. the second return water temperature threshold of the cooling water is determined), and according to the second return water temperature threshold and the operating temperature value of the temperature difference bypass proportional control valve, the refrigeration mode is switched to the mechanical refrigeration mode.

[0067] In order to stably switch the refrigeration mode to the mechanical refrigeration mode, in the refrigeration mode switching method provided in Embodiment 1 of the present application, in the case where the second return water temperature threshold is less than the operating temperature value, the opening and closing of the temperature difference bypass proportional control valve is controlled to obtain an initial opening ratio, wherein the initial opening ratio is used to adjust the flow of the cooling water; the second supply water temperature threshold of the chilled water is determined, wherein the second supply water temperature threshold is the supply water temperature threshold of the chilled water in the mechanical refrigeration mode; in the case where it is monitored that the supply water temperature of the chilled water is greater than or equal to the second supply water temperature threshold within a sixth preset time length, the refrigeration mode is switched to the mechanical refrigeration mode.

[0068] In the embodiment of the present application, when the natural cooling mode is exited and the mechanical refrigeration mode is prepared to be entered, the system calculates and sets the initial opening ratio of the temperature difference bypass proportional control valve according to the relationship between the current second return water temperature threshold and the operating temperature value (i.e. the initial opening ratio of the temperature difference bypass proportional control valve is obtained by controlling the opening and closing of the temperature difference bypass proportional control valve when the second return water temperature threshold is less than the operating temperature value), and the lower the return water temperature of the cooling water is, the greater the opening of the temperature difference bypass proportional control valve is, so as to optimize the circulation path and flow of the cooling water. Then, the second chilled water supply temperature threshold (such as Tch) in the mechanical refrigeration mode is determined, and when it is monitored that the supply temperature of the chilled water is greater than or equal to the second supply temperature threshold within a sixth preset time (such as tch), the refrigeration mode is switched to the mechanical refrigeration mode.

[0069] In order to improve the efficiency of the operation of the water chiller unit, in the switching method of the refrigeration mode provided in Embodiment 1 of the present application, the cooling water pump of the refrigeration unit is started, and the flow signal of the cooling water is obtained; when the flow signal is greater than a preset flow threshold, the water chiller unit of the refrigeration unit is started; and when the second return water temperature threshold is greater than or equal to the operating temperature value, the initial opening ratio of the temperature difference bypass proportional control valve is adjusted to obtain a target opening ratio, and the cooling tower of the cooling circulation system is started.

[0070] Optionally, since in the natural cooling mode, the temperature of the cooling water is naturally cooled to a lower level by the external environment, when the system needs to be switched to the mechanical refrigeration mode, the excessively low temperature of the cooling water hinders the normal operation of the water chiller unit.

[0071] In the embodiment of the present application, the cooling water pump matched with the chilled water pump of the refrigeration unit is started, at this time, the cooling water does not enter the cooling tower for cooling, but directly enters the condenser of the water chiller unit through the adjustment of the temperature difference bypass valve to exchange heat with the refrigerant, so as to quickly raise the water temperature to an appropriate level.

[0072] Then, the flow signal of the cooling water is obtained, when the flow signal is greater than a preset flow threshold (i.e. the minimum flow is met), the water chiller unit of the refrigeration unit is started, and when the second return water temperature threshold is greater than or equal to the operating temperature value, the temperature difference bypass proportional control valve of the single cooling water inlet and return water main is slowly closed (i.e. the initial opening ratio of the temperature difference bypass proportional control valve is adjusted to obtain a target opening ratio), and the cooling tower of the cooling circulation system is started, and the fan of the cooling tower is slowly loaded to stable operation according to the water temperature of the cooling water return.

[0073] Figure 4 is a flow chart for exiting the natural cooling according to Embodiment 1 of the present application, as Figure 4As shown, first, it is judged whether the outdoor average wet-bulb temperature is continuously higher than the natural cooling exit set temperature, and whether the single-path chilled water supply temperature is continuously higher than the set value. In the case that the outdoor average wet-bulb temperature is continuously higher than the natural cooling exit set temperature, or the single-path chilled water supply temperature is continuously higher than the set value (i.e. in the case that the wet-bulb temperature is greater than the preset natural cooling exit temperature threshold for a second preset time length, or the chilled water supply temperature in the natural cooling mode is greater than the preset supply temperature threshold for a third preset time length), the natural cooling mode is exited, the chilled water pump on the chilled water side of the plate heat exchanger is stopped, the corresponding electric valve is closed, then the chilled water pump with the shortest single-path running time is started, the cooling water pump on the cooling water side of the plate heat exchanger is stopped, the corresponding electric valve is closed, the cooling tower is stopped, at the same time, the single-path cooling water return temperature is adjusted from the set value in the natural cooling mode to the set value in the mechanical cooling mode, and the single-path chilled water supply temperature is adjusted from the set value in the natural cooling mode to the set value in the mechanical cooling mode, the temperature difference bypass proportional control valve of the single-path cooling water supply and return pipeline is opened according to the return temperature and kept (i.e. the opening and closing of the temperature difference bypass proportional control valve is controlled to obtain an initial opening and closing ratio), then the electric valves corresponding to the chilled water pump and the cooling water pump of the single-path refrigeration unit are opened, the chilled water pump and the cooling water pump are started, the cooling water and the chilled water directly exchange heat in the chiller, the cooling water return temperature rises, and the chilled water and cooling water flow signals are monitored, after the chiller obtains the chilled water and cooling water flow signals, the chiller is started, then it is judged whether the single-path cooling water return temperature is higher than the bypass proportional control valve action temperature, in the case that the single-path cooling water return temperature is higher than the bypass proportional control valve action temperature (i.e. in the case that the second return temperature threshold is greater than or equal to the operating temperature value), the bypass proportional control valve of the single-path cooling water inlet and return pipeline is closed (i.e. the initial opening and closing ratio of the temperature difference bypass proportional control valve is adjusted to obtain a target opening and closing ratio), the single-path cooling tower fan is started, and the cooling tower fan is loaded according to the cooling water return temperature, if the single-path cooling water return temperature reaches the set value in the mechanical mode (i.e. in the case that the chilled water supply temperature is greater than or equal to the second supply temperature threshold for a sixth preset time length), the chilled water supply temperature reaches the set value in the mechanical mode, at this time, the chiller completely takes over the single-path chilled water, and returns to the mechanical refrigeration mode.

[0074] The switching method of the refrigeration mode provided by the embodiments of the present application can automatically and smoothly switch the refrigeration mode of the data center cooling system under different seasonal conditions, effectively improve the energy utilization efficiency, reduce the operation cost, and ensure the stability and reliability of the cooling effect, by means of the fine temperature threshold setting and dynamic monitoring mechanism, the intelligent refrigeration unit and cooling circulation system control strategy, and the operation mode combining the efficient use of natural cooling source and mechanical refrigeration.

[0075] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0076] Embodiment 2

[0077] The embodiment of the present application also provides a switching device for a refrigeration mode. It should be noted that the switching device for a refrigeration mode of the embodiment of the present application can be used to execute the method for switching a refrigeration mode provided by the embodiment of the present application. The switching device for a refrigeration mode provided by the embodiment of the present application is introduced as follows.

[0078] According to the embodiment of the present application, a device for implementing the above-mentioned method for switching a refrigeration mode is also provided. Figure 5 is a schematic diagram of an optional switching device for a refrigeration mode according to the embodiment of the present application, as shown in Figure 5 The switching device for a refrigeration mode can include a first monitoring unit 50, a first switching unit 51, and a second switching unit 52.

[0079] The first monitoring unit 50 is configured to monitor a wet-bulb temperature of an external environment of a data center when it is detected that the refrigeration mode of a cooling circulation system is a mechanical refrigeration mode, wherein the wet-bulb temperature is a temperature reached by evaporative cooling of air at a preset humidity.

[0080] The first switching unit 51 is configured to switch the refrigeration mode to a natural cooling mode and start a refrigeration process in the natural cooling mode when it is monitored that the wet-bulb temperature is less than a preset natural cooling commissioning temperature threshold value within a first preset time length.

[0081] The second switching unit 52 is configured to stop the refrigeration process and switch the refrigeration mode to the mechanical refrigeration mode when it is monitored that the wet-bulb temperature is greater than a preset natural cooling exit temperature threshold value within a second preset time length, or a supply water temperature of chilled water in the natural cooling mode is greater than a preset supply water temperature threshold value within a third preset time length, wherein the supply water temperature is a temperature obtained after the chilled water is cooled.

[0082] The switching device for the refrigeration mode provided in the embodiments of the present application can monitor the wet bulb temperature of the external environment of the data center when detecting that the refrigeration mode of the cooling circulation system is the mechanical refrigeration mode, can switch the refrigeration mode to the natural cooling mode and start the refrigeration process in the natural cooling mode when monitoring that the wet bulb temperature is less than the preset natural cooling putting temperature threshold value within the first preset time length, and can stop the refrigeration process and switch the refrigeration mode to the mechanical refrigeration mode when monitoring that the wet bulb temperature is greater than the preset natural cooling exiting temperature threshold value within the second preset time length or the supply water temperature of the chilled water in the natural cooling mode is greater than the preset supply water temperature threshold value within the third preset time length.

[0083] Optionally, the first switching unit 51 comprises: a first determination module configured to determine a first return water temperature threshold value of the return water temperature of the cooling water, wherein the return water temperature is the temperature of the cooling water after absorbing heat; a second determination module configured to determine a first supply water temperature threshold value of the supply water temperature of the chilled water; and a first starting module configured to start the refrigeration process in the natural cooling mode according to the first return water temperature threshold value and the first supply water temperature threshold value.

[0084] Optionally, the switching device for the refrigeration mode comprises: a second starting module configured to start the fan of the cooling tower after determining the first supply water temperature threshold value of the supply water temperature of the chilled water; a first stopping module configured to stop the target refrigeration unit and start the chilled water pump of the other refrigeration unit, wherein the target refrigeration unit is the refrigeration unit currently used by the cooling circulation system, and the other refrigeration unit is the refrigeration unit other than the target refrigeration unit; and a first adjusting module configured to adjust the isolation electric valve state of the cold storage tank, wherein the cold storage tank stores the chilled water, and the isolation electric valve state is used to control whether the cold storage tank participates in the circulation of the chilled water.

[0085] Optionally, the first starting module comprises: a first starting sub-module configured to open the electric valve of the cooling water side of the plate heat exchanger and start the cooling water pump corresponding to the plate heat exchanger, wherein the cooling water pump is used to drive the circulation of the cooling water; a second starting sub-module configured to open the electric valve of the chilled water side of the plate heat exchanger and start the chilled water pump corresponding to the plate heat exchanger when monitoring that the return water temperature of the cooling water is less than the first return water temperature threshold value within the fourth preset time length, wherein the chilled water pump is used to drive the circulation of the chilled water; and a first adjusting sub-module configured to stop the chilled water pump of the other refrigeration unit and adjust the isolation electric valve state to obtain the target isolation electric valve state of the cold storage tank when monitoring that the supply water temperature of the chilled water is less than the first supply water temperature threshold value within the fifth preset time length.

[0086] Optionally, the second switching unit 52 comprises: a first calculation module, configured to calculate the working time length of all the chilled water pumps, and start the refrigeration unit in which the chilled water pump with the minimum working time length is located; a first closing module, configured to stop the chilled water pump on the chilled water side of the plate heat exchanger, and close the electric valve on the chilled water side of the plate heat exchanger; a second stopping module, configured to stop the fan of the cooling tower of the cooling circulation system; a second closing module, configured to stop the cooling water pump on the cooling water side of the plate heat exchanger, and close the electric valve on the cooling water side of the plate heat exchanger; a third determination module, configured to determine the second return water temperature threshold of the cooling water; and a first switching module, configured to switch the refrigeration mode to the mechanical refrigeration mode according to the second return water temperature threshold and the operation temperature value.

[0087] Optionally, the first switching module comprises: a first control submodule, configured to control the switch of the temperature difference bypass proportional control valve to obtain an initial switch ratio in a case where the second return water temperature threshold is less than the operation temperature value, wherein the initial switch ratio is used to adjust the flow of the cooling water; a first determination submodule, configured to determine the second supply water temperature threshold of the chilled water, wherein the second supply water temperature threshold is the supply water temperature threshold of the chilled water in the mechanical refrigeration mode; and a first switching submodule, configured to switch the refrigeration mode to the mechanical refrigeration mode in a case where it is monitored that the supply water temperature of the chilled water is greater than or equal to the second supply water temperature threshold within a sixth preset time length.

[0088] Optionally, the switching device of the refrigeration mode further comprises: a third starting module, configured to start the cooling water pump of the refrigeration unit and acquire the flow signal of the cooling water after the switch of the temperature difference bypass proportional control valve is controlled to obtain the initial switch ratio; a fourth starting module, configured to start the water chiller unit of the refrigeration unit in a case where the flow signal is greater than a preset flow threshold; and a second adjustment module, configured to adjust the initial switch ratio of the temperature difference bypass proportional control valve to obtain a target switch ratio, and start the cooling tower of the cooling circulation system in a case where the second return water temperature threshold is greater than or equal to the operation temperature value.

[0089] The switching device of the refrigeration mode described above can further comprise a processor and a memory, and the first monitoring unit 50, the first switching unit 51, the second switching unit 52, etc. described above are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory.

[0090] The processor described above comprises a core, and the core calls the corresponding program units from the memory. The core can be one or more, and the core parameters are adjusted to stop the refrigeration process and switch the refrigeration mode to the mechanical refrigeration mode in a case where it is monitored that the wet-bulb temperature is greater than a preset natural cooling exit temperature threshold within a second preset time length, or the supply water temperature of the chilled water in the natural cooling mode is greater than a preset supply water temperature threshold within a third preset time length.

[0091] The above-mentioned memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0092] It should be noted that the first monitoring unit 50, the first switching unit 51, and the second switching unit 52 described above correspond to steps S201 to S203 in Example 1. The examples and application scenarios implemented by the above units and the corresponding steps are the same, but are not limited to the contents disclosed in Example 1. It should be noted that the above units can be hardware components or software components stored in a memory (e.g., memory 104) and processed by one or more processors (e.g., processors 102a, 102b, ..., 102n). The above units can also be part of a device and can be run in the computer terminal 10 provided in Example 1.

[0093] Example 3

[0094] The embodiment of the present application may provide a computer terminal, which may be any computer terminal device in a computer terminal group. Optionally, in this embodiment, the computer terminal may also be replaced by a terminal device such as a mobile terminal or an electronic device.

[0095] Optionally, in this embodiment, the computer terminal may be located in at least one network device among a plurality of network devices of a computer network.

[0096] In this embodiment, the above-mentioned computer terminal can execute the program code of the following steps in the cooling mode switching method: when it is detected that the cooling mode of the cooling cycle system is the mechanical cooling mode, the wet-bulb temperature of the external environment of the data center is monitored, wherein the wet-bulb temperature is the temperature reached by evaporative cooling of the air at a preset humidity; when it is monitored that the wet-bulb temperature is less than the preset natural cooling commissioning temperature threshold within a first preset time period, the cooling mode is switched to the natural cooling mode, and the cooling process under the natural cooling mode is started; when it is monitored that the wet-bulb temperature is greater than the preset natural cooling exit temperature threshold within a second preset time period, or the supply water temperature of the chilled water in the natural cooling mode is greater than the preset supply water temperature threshold within a third preset time period, the cooling process is stopped, and the cooling mode is switched to the mechanical cooling mode, wherein the supply water temperature is the temperature obtained after cooling the chilled water.

[0097] Optionally, the computer terminal can execute program codes of the following steps in the switching method of the refrigeration mode: determining a first return water temperature threshold of a return water temperature of the cooling water, wherein the return water temperature is a temperature of the cooling water after absorbing heat; determining a first supply water temperature threshold of a supply water temperature of the chilled water; starting the refrigeration process in the natural cooling mode according to the first return water temperature threshold and the first supply water temperature threshold.

[0098] Optionally, the computer terminal can execute program codes of the following steps in the switching method of the refrigeration mode: starting a fan of the cooling tower; stopping a target refrigeration unit and starting a chilled water pump of another refrigeration unit, wherein the target refrigeration unit is a refrigeration unit currently used by the cooling circulation system, and the another refrigeration unit is a refrigeration unit other than the target refrigeration unit; adjusting an isolation electric valve state of the cold storage tank, wherein the cold storage tank stores the chilled water, and the isolation electric valve state is used to control whether the cold storage tank participates in the circulation of the chilled water.

[0099] Optionally, the computer terminal can execute program codes of the following steps in the switching method of the refrigeration mode: opening an electric valve of a cooling water side of the plate heat exchanger and starting a cooling water pump corresponding to the plate heat exchanger, wherein the cooling water pump is used to drive the circulation of the cooling water; in a case where a return water temperature of the cooling water is monitored to be less than the first return water temperature threshold within a fourth preset time length, opening an electric valve of a chilled water side of the plate heat exchanger and starting a chilled water pump corresponding to the plate heat exchanger, wherein the chilled water pump is used to drive the circulation of the chilled water; in a case where a supply water temperature of the chilled water is monitored to be less than the first supply water temperature threshold within a fifth preset time length, stopping the chilled water pump of the another refrigeration unit and adjusting the isolation electric valve state to obtain a target isolation electric valve state of the cold storage tank.

[0100] Optionally, the computer terminal can execute program codes of the following steps in the switching method of the refrigeration mode: calculating working time lengths of all the chilled water pumps and starting a refrigeration unit in which a chilled water pump with the minimum working time length is located; stopping the chilled water pump of the chilled water side of the plate heat exchanger and closing the electric valve of the chilled water side of the plate heat exchanger; stopping the fan of the cooling tower of the cooling circulation system; stopping the cooling water pump of the cooling water side of the plate heat exchanger and closing the electric valve of the cooling water side of the plate heat exchanger; determining a second return water temperature threshold of the cooling water; and switching the refrigeration mode to the mechanical refrigeration mode according to the second return water temperature threshold and the operating temperature value.

[0101] Optionally, the above-mentioned computer terminal can execute the program code of the following steps in the cooling mode switching method: when the second return water temperature threshold is less than the operating temperature value, control the switch of the temperature difference bypass proportional control valve to obtain an initial switch ratio, wherein the initial switch ratio is used to adjust the flow rate of cooling water; determine the second water supply temperature threshold of the chilled water, wherein the second water supply temperature threshold is the water supply temperature threshold of the chilled water in the mechanical refrigeration mode; when it is monitored that the water supply temperature of the chilled water is greater than or equal to the second water supply temperature threshold within a sixth preset time period, switch the cooling mode to the mechanical refrigeration mode.

[0102] Optionally, the above-mentioned computer terminal can execute the program code of the following steps in the cooling mode switching method: start the cooling water pump of the refrigeration unit and obtain the flow signal of the cooling water; when the flow signal is greater than the preset flow threshold, start the chiller of the refrigeration unit; when the second return water temperature threshold is greater than or equal to the operating temperature value, adjust the initial switching ratio of the temperature difference bypass proportional control valve to obtain the target switching ratio, and start the cooling tower of the cooling circulation system.

[0103] Optionally, Figure 6 This is a structural block diagram of an electronic device according to an embodiment of the present application. Figure 6 As shown, the electronic device may include: one or more ( Figure 6 Only one is shown) processor 602, memory 604, storage controller, and peripheral interface, wherein the peripheral interface is connected to the radio frequency module, audio module and display.

[0104] Among them, the memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the switching method and device of the cooling mode in the embodiment of the present application. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, realizing the above-mentioned switching method of the cooling mode. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include a memory remotely arranged relative to the processor, and these remote memories can be connected to the terminal via a network. Examples of the above-mentioned network include but are not limited to the Internet, corporate intranet, local area network, mobile communication network and combinations thereof.

[0105] The processor can call the information and application programs stored in the memory through the transmission device to execute the above steps in the above method for switching the cooling mode.

[0106] By adopting the embodiment of the present application, a scheme for switching refrigeration modes is provided, real-time analysis of external conditions is performed through environmental monitoring, it is determined whether the external conditions meet the conditions for natural cooling switching, when the external conditions no longer meet the conditions for natural cooling, it can be quickly identified, and smoothly transition from the natural cooling mode to the mechanical refrigeration mode. At the same time, the cooling tower fan speed can be adjusted according to the cooling water return water temperature, to ensure that the cooling water can effectively dissipate heat and not excessively consume energy. After the natural cooling mode exits, the refrigeration unit is started and the working state of the chilled water pump is adjusted to ensure that the chilled water temperature quickly returns to the set value, while avoiding energy waste, which is helpful for efficient and stable operation of the water chiller, thereby solving the technical problem of low energy utilization rate in the related art due to the inability to smoothly switch the refrigeration mode.

[0107] Those skilled in the art can understand that Figure 6 The structure shown is only schematic, and the electronic device can also be a terminal device such as a smart phone, a tablet computer, a palm computer, and a mobile Internet device (MID). Figure 6 It does not limit the structure of the electronic device. For example, the electronic device can include more or fewer components (such as a network interface, a display device, etc.) than Figure 6 or have a different configuration than Figure 6 shown.

[0108] Those skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing the relevant hardware of the terminal device through a program, and the program can be stored in a computer-readable storage medium, which can include a flash disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0109] Embodiment 4

[0110] The embodiment of the present application also provides a storage medium. Optionally, in the present embodiment, the above-mentioned storage medium can be used to save the program code executed by the refrigeration mode switching method provided in Embodiment 1.

[0111] Optionally, in the present embodiment, the above-mentioned storage medium can be located in any one of the computer terminals in the computer terminal group in the computer network, or in any one of the mobile terminals in the mobile terminal group.

[0112] The present application also provides a computer program product adapted to execute the steps of the refrigeration mode switching method when executed on a data processing device.

[0113] The above embodiment numbers of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

[0114] In the above embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0115] In the several embodiments provided by the present application, it should be understood that the disclosed technology can be implemented in other ways. Of course, the embodiment described above is only a schematic and illustrative, the division of the units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, unit or module, and can be electrical or other forms.

[0116] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0117] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The above integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0118] The integrated unit, if realized in the form of software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part of the prior art that makes a contribution or the whole or part of the technical solutions can be embodied in the form of software product, which is stored in a storage medium and includes a plurality of instructions for making a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and various program code storage media.

[0119] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method for switching a cooling mode, characterized in that: Applied to a data center cooling system, the data center cooling system at least includes: a cooling circulation system, and the switching method includes: When it is detected that the cooling mode of the cooling cycle system is a mechanical cooling mode, monitoring the wet-bulb temperature of an external environment of the data center, wherein the wet-bulb temperature is a temperature reached by evaporative cooling of air at a preset humidity; When it is detected that the wet-bulb temperature is less than a preset natural cooling temperature threshold within a first preset time period, the cooling mode is switched to the natural cooling mode, and the cooling process in the natural cooling mode is started; When it is monitored that the wet-bulb temperature is greater than the preset natural cooling exit temperature threshold within the second preset time period, or the supply water temperature of the chilled water in the natural cooling mode is greater than the preset supply water temperature threshold within the third preset time period, the refrigeration process is stopped and the refrigeration mode is switched to the mechanical refrigeration mode, wherein the supply water temperature is the temperature obtained after cooling the chilled water.

2. The method for switching the cooling mode according to claim 1, characterized in that: The step of switching the refrigeration mode to the natural cooling mode and starting the refrigeration process in the natural cooling mode includes: Determining a first return water temperature threshold of a return water temperature of cooling water, wherein the return water temperature is a temperature obtained after the cooling water absorbs heat; Determining a first water supply temperature threshold of the chilled water supply temperature; The refrigeration process in the natural cooling mode is started according to the first return water temperature threshold and the first supply water temperature threshold.

3. The method for switching the cooling mode according to claim 2, characterized in that: The cooling cycle system in the mechanical refrigeration mode includes at least: a cooling tower, a cold storage tank, and a refrigeration unit, wherein the refrigeration unit includes at least: a chiller, a chilled water pump, and a cooling water pump. After determining the first water supply temperature threshold of the chilled water supply temperature, the system further includes: Starting the fan of the cooling tower; Stopping a target refrigeration unit and starting the chilled water pumps of other refrigeration units, wherein the target refrigeration unit is a refrigeration unit currently in use by the cooling cycle system, and the other refrigeration units are refrigeration units other than the target refrigeration unit; The isolation electric valve state of the cold storage tank is adjusted, wherein the cold storage tank stores chilled water, and the isolation electric valve state is used to control whether the cold storage tank participates in the circulation of the chilled water.

4. The method for switching the cooling mode according to claim 3, characterized in that: The cooling circulation system in the natural cooling mode includes at least a plate heat exchanger, and the refrigeration process includes at least starting the cooling water pump of the plate heat exchanger, starting the chilled water pump of the plate heat exchanger, and adjusting the state of the isolation electric valve of the cold storage tank. The steps of starting the refrigeration process in the natural cooling mode based on the first return water temperature threshold and the first supply water temperature threshold include: Open the electric valve on the cooling water side of the plate heat exchanger and start the cooling water pump corresponding to the plate heat exchanger, wherein the cooling water pump is used to promote the cooling water circulation; When it is monitored that the return water temperature of the cooling water is less than the first return water temperature threshold within a fourth preset time period, the electric valve on the chilled water side of the plate heat exchanger is opened, and the chilled water pump corresponding to the plate heat exchanger is started, wherein the chilled water pump is used to promote the chilled water circulation; When it is monitored that the supply temperature of the chilled water is less than the first supply temperature threshold within the fifth preset time period, the chilled water pumps of the other refrigeration units are stopped, and the isolation electric valve state is adjusted to obtain the target isolation electric valve state of the cold storage tank.

5. The method for switching the cooling mode according to claim 1, wherein: The cooling cycle system at least includes: a temperature difference bypass proportional control valve, wherein the temperature difference bypass proportional control valve corresponds to an operating temperature value, and the steps of stopping the refrigeration process and switching the refrigeration mode to the mechanical refrigeration mode include: Calculate the working hours of all chilled water pumps and start the refrigeration unit where the chilled water pump with the shortest working hours is located; Stop the chilled water pump on the chilled water side of the plate heat exchanger, and close the electric valve on the chilled water side of the plate heat exchanger; Stopping the fan of the cooling tower of the cooling circulation system; Stop the cooling water pump on the cooling water side of the plate heat exchanger, and close the electric valve on the cooling water side of the plate heat exchanger; Determine a second return water temperature threshold of the cooling water; The cooling mode is switched to the mechanical cooling mode according to the second return water temperature threshold and the operating temperature value.

6. The method for switching the cooling mode according to claim 5, characterized in that: The step of switching the cooling mode to the mechanical cooling mode according to the second return water temperature threshold and the operating temperature value includes: When the second return water temperature threshold is lower than the operating temperature value, controlling the switch of the temperature difference bypass proportional control valve to obtain an initial switch ratio, wherein the initial switch ratio is used to adjust the flow rate of the cooling water; Determining a second water supply temperature threshold of the chilled water, wherein the second water supply temperature threshold is a water supply temperature threshold of the chilled water in the mechanical refrigeration mode; When it is monitored that the supply water temperature of the chilled water is greater than or equal to the second supply water temperature threshold within a sixth preset time period, the refrigeration mode is switched to the mechanical refrigeration mode.

7. The method for switching the cooling mode according to claim 6, characterized in that: After controlling the switch of the temperature difference bypass proportional control valve to obtain an initial switch ratio, the method further includes: Starting the cooling water pump of the refrigeration unit and obtaining a flow signal of the cooling water; When the flow signal is greater than a preset flow threshold, starting the chiller of the refrigeration unit; When the second return water temperature threshold is greater than or equal to the operating temperature value, the initial switching ratio of the temperature difference bypass proportional control valve is adjusted to obtain a target switching ratio, and the cooling tower of the cooling circulation system is started.

8. A cooling mode switching device, characterized in that: Applicable to a data center cooling system, the data center cooling system at least includes: a cooling circulation system, including: a first monitoring unit configured to monitor a wet-bulb temperature of an external environment of the data center when detecting that the cooling mode of the cooling cycle system is a mechanical cooling mode, wherein the wet-bulb temperature is a temperature reached by evaporative cooling of air at a preset humidity; a first switching unit, configured to switch the cooling mode to the natural cooling mode and start the cooling process in the natural cooling mode when monitoring that the wet-bulb temperature is less than a preset natural cooling temperature threshold within a first preset time period; The second switching unit is used to stop the refrigeration process and switch the refrigeration mode to the mechanical refrigeration mode when it is monitored that the wet-bulb temperature is greater than the preset natural cooling exit temperature threshold within the second preset time period, or the supply water temperature of the chilled water in the natural cooling mode is greater than the preset supply water temperature threshold within the third preset time period, wherein the supply water temperature is the temperature obtained after cooling the chilled water.

9. A computer program product, characterized in that The invention comprises a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for switching the cooling mode according to any one of claims 1 to 7 is implemented.

10. An electronic device, characterized in that: The invention comprises one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the refrigeration mode switching method described in any one of claims 1 to 7.

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