A chilled water temperature difference control method and device, computer equipment and storage medium

Abstract

This invention discloses a method, apparatus, computer equipment, and storage medium for controlling chilled water temperature difference. The method includes: detecting the temperature difference between the outlet and return water of a cooling tower to obtain a first water temperature difference; adjusting the operating frequency of the main water pump in the cooling tower based on changes in the first water temperature difference to maintain the first water temperature difference within a first preset water temperature difference range; detecting the chilled water temperature difference between the inter-layer supply pipe and the inter-layer return pipe to obtain a second water temperature difference; adjusting the opening degree of the inter-layer valve between the inter-layer supply pipe and the inter-layer return pipe based on changes in the second water temperature difference to maintain the second water temperature difference within a second preset water temperature difference range; and detecting the chilled water temperature difference between the inter-layer supply pipe and the terminal return pipe to obtain a third water temperature difference; adjusting the opening degree of the terminal valve between the inter-layer supply pipe and the terminal return pipe based on changes in the third water temperature difference to maintain the third water temperature difference within a third preset water temperature difference range. This invention employs a three-stage temperature difference control strategy to achieve stable temperature difference control.

Description

Technical Field

[0001] This invention relates to the field of central air conditioning technology, and in particular to a method, apparatus, computer equipment, and storage medium for controlling chilled water temperature difference. Background Technology

[0002] In current central air conditioning chilled water temperature control technology, there are two common methods: constant pressure difference control and constant temperature difference control. In actual operation, because the constant pressure difference control method for controlling the pump frequency has higher requirements for the pressure difference set value and the debugging of the pipeline system, constant temperature difference control is more widely used in actual projects.

[0003] Ideally, the target control temperature difference of the chilled water circulation pump should be the temperature difference value of the chilled water system under design conditions. However, in reality, due to application scenarios (such as multi-story buildings), chilled water delivery paths, height, and pipeline resistance characteristics, chilled water often exhibits strong load unevenness between different floors and at different floor ends. This results in chilled water having different and significant temperature differences at different nodes. In such cases, it is difficult to achieve temperature uniformity of the entire central air conditioning system by adjusting the target control temperature difference of the chilled water circulation pump. Summary of the Invention

[0004] The purpose of this invention is to provide a method, device, computer equipment, and storage medium for controlling the temperature difference of chilled water, which aims to solve the problem that existing constant temperature difference control methods for chilled water in central air conditioning systems have strong load unevenness between different floors and at different ends of different floors when applied to multi-story buildings.

[0005] In a first aspect, embodiments of the present invention provide a method for controlling the temperature difference of chilled water, comprising:

[0006] The temperature difference between the chilled water outlet and chilled water return of the cooling tower is detected to obtain the first water temperature difference. Based on the change of the first water temperature difference, the operating frequency of the main water pump in the cooling tower is adjusted to control the first water temperature difference to be maintained within the first preset water temperature difference range.

[0007] The temperature difference between the chilled water in the inter-floor water supply pipe and the inter-floor water return pipe is detected to obtain a second water temperature difference. Based on the change of the second water temperature difference, the opening of the inter-floor valve between the inter-floor water supply pipe and the inter-floor water return pipe is adjusted to control the second water temperature difference to be maintained within a second preset water temperature difference range.

[0008] The temperature difference between the chilled water in the inter-floor water supply pipe and the end return water pipe is detected to obtain a third water temperature difference. Based on the change of the third water temperature difference, the opening of the end valve between the inter-floor water supply pipe and the end return water pipe is adjusted to control the third water temperature difference to be maintained within a third preset water temperature difference range.

[0009] In a second aspect, embodiments of the present invention provide a chilled water temperature difference control device, comprising:

[0010] The first control unit is used to detect the temperature difference between the chilled water outlet and the chilled water return of the cooling tower, obtain the first water temperature difference, and adjust the operating frequency of the main water pump in the cooling tower based on the change of the first water temperature difference, so as to control the first water temperature difference to be maintained within the first preset water temperature difference range.

[0011] The second control unit is used to detect the chilled water temperature difference between the inter-layer water supply pipe and the inter-layer water return pipe, obtain the second water temperature difference, and adjust the opening of the inter-layer valve between the inter-layer water supply pipe and the inter-layer water return pipe based on the change of the second water temperature difference, so as to control the second water temperature difference to be maintained within the second preset water temperature difference range.

[0012] The third control unit is used to detect the chilled water temperature difference between the inter-floor water supply pipe and the terminal return water pipe, obtain the third water temperature difference, and adjust the opening of the terminal valve between the inter-floor water supply pipe and the terminal return water pipe based on the change of the third water temperature difference, so as to control the third water temperature difference to be maintained within the third preset water temperature difference range.

[0013] Thirdly, embodiments of the present invention provide a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the chilled water temperature difference control method described in the first aspect.

[0014] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the chilled water temperature difference control method described in the first aspect.

[0015] This invention discloses a method, apparatus, computer equipment, and storage medium for controlling chilled water temperature difference. The method includes: detecting the temperature difference between the outlet and return water of a cooling tower to obtain a first water temperature difference; adjusting the operating frequency of the main water pump in the cooling tower based on changes in the first water temperature difference to maintain the first water temperature difference within a first preset water temperature difference range; detecting the chilled water temperature difference between the inter-layer supply pipe and the inter-layer return pipe to obtain a second water temperature difference; adjusting the opening degree of the inter-layer valve between the inter-layer supply pipe and the inter-layer return pipe based on changes in the second water temperature difference to maintain the second water temperature difference within a second preset water temperature difference range; and detecting the chilled water temperature difference between the inter-layer supply pipe and the terminal return pipe to obtain a third water temperature difference; adjusting the opening degree of the terminal valve between the inter-layer supply pipe and the terminal return pipe based on changes in the third water temperature difference to maintain the third water temperature difference within a third preset water temperature difference range. This invention employs a three-stage temperature difference control strategy to achieve stable temperature difference control. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic flowchart of the chilled water temperature difference control method provided in an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of a sub-process of the chilled water temperature difference control method provided in an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of a sub-process of the chilled water temperature difference control method provided in an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of a sub-process of the chilled water temperature difference control method provided in an embodiment of the present invention;

[0021] Figure 5 A schematic block diagram of a chilled water temperature difference control device provided in an embodiment of the present invention;

[0022] Figure 6 A schematic block diagram of a computer device provided for an embodiment of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0026] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0027] Please see Figure 1 , Figure 1 A schematic flowchart of the chilled water temperature difference control method provided in an embodiment of the present invention;

[0028] like Figure 1 As shown, the method includes steps S101 to S103.

[0029] S101. Detect the temperature difference between the chilled water outlet and chilled water return of the cooling tower to obtain the first water temperature difference, and adjust the operating frequency of the main water pump in the cooling tower based on the change of the first water temperature difference to control the first water temperature difference to be maintained within the first preset water temperature difference range.

[0030] In this step, the cooling tower serves as both the starting and ending point of the chilled water circulation, providing low-temperature chilled water outlet and recooling the chilled water return after heat exchange. Therefore, by using a thermometer to detect the temperature of the chilled water outlet and return, the current first water temperature difference can be obtained. Based on the first water temperature difference, the operating frequency of the cooling tower's main pump is controlled to regulate the temperature difference between the chilled water outlet and return, thereby maintaining the first water temperature difference within a first preset water temperature difference range. The first preset water temperature difference range is the temperature difference control range that the entire central air conditioning system is expected to maintain, as desired by this application.

[0031] S102. Detect the chilled water temperature difference between the inter-floor water supply pipe and the inter-floor water return pipe to obtain the second water temperature difference, and adjust the opening of the inter-floor valve between the inter-floor water supply pipe and the inter-floor water return pipe based on the change of the second water temperature difference, so as to control the second water temperature difference to be maintained within the second preset water temperature difference range.

[0032] In this step, taking a building as an example, the riser connects to multiple floors. Each floor is equipped with an inter-floor water supply pipe and an inter-floor water return pipe that connect to the riser. The chilled water in the riser flows into the inter-floor water supply pipe and undergoes heat exchange through the terminal equipment in the floor. The chilled water after heat exchange returns to the riser through the inter-floor water return pipe. That is, the chilled water in the inter-floor water supply pipe and the inter-floor water return pipe are the chilled water before and after heat exchange in the floor. Therefore, by installing thermometers on the inter-floor water supply pipe and the inter-floor water return pipe that connect to the riser on each floor, the current second water temperature difference can be obtained. Based on the change of the second water temperature difference, the opening of the inter-floor valve is controlled, thereby controlling the flow rate of the chilled water at that point, which in turn affects the value of the second water temperature difference, so as to keep the second water temperature difference within the second preset water temperature difference range.

[0033] S103. Detect the chilled water temperature difference between the inter-floor water supply pipe and the end return water pipe to obtain the third water temperature difference, and adjust the opening of the end valve between the inter-floor water supply pipe and the end return water pipe based on the change of the third water temperature difference, so as to control the third water temperature difference to be maintained within the third preset water temperature difference range.

[0034] In this step, the chilled water from the inter-floor water supply pipe undergoes heat exchange at the terminal equipment (the destination of heat transfer, such as room air conditioning equipment) and then returns to the inter-floor water return pipe through the terminal return water pipe. That is, the third water temperature difference is detected at the nodes before and after the heat exchange at the terminal equipment, and the opening of the terminal valve is controlled based on the third water temperature difference, thereby controlling the flow rate of chilled water at the nodes before and after the heat exchange at the terminal equipment, thus affecting the value of the third water temperature difference, so as to control the third water temperature difference to be maintained within the third preset water temperature difference range.

[0035] In this embodiment, low-temperature chilled water is supplied by a cooling tower. The chilled water passes through the inter-floor water supply pipes of each floor and then through various terminal devices in each inter-floor water supply pipe for heat exchange. It then returns through the inter-floor return water pipes of each floor and finally returns to the cooling tower after being heated by heat exchange for cooling again. This cycle is repeated to realize the refrigeration cycle of the central air conditioning system.

[0036] This embodiment employs a three-level control scheme to regulate the chilled water flow rate at three different node locations to achieve chilled water temperature difference control. The first level of control adjusts the operating frequency and power of the main pump in the cooling tower to control the chilled water flow rate. The second level of control adjusts the opening degree of the inter-floor valves to control the chilled water flow rate. The third level of control adjusts the opening degree of the terminal valves to control the chilled water flow rate. Therefore, in scenarios requiring simultaneous cooling of multiple floors, the chilled water temperature difference control method of this application can effectively ensure the stability of the chilled water temperature difference throughout the central air conditioning system.

[0037] The first-stage temperature difference control process is described in detail below.

[0038] In one embodiment, such as Figure 2 As shown, step S101 includes:

[0039] S201. Detect the temperature difference between the inlet and outlet chilled water of the cooling tower to obtain the first water temperature difference;

[0040] S202. When the first water temperature difference is greater than the first preset water temperature difference range, the operating frequency of the main water pump is increased until the first water temperature difference drops to the first preset water temperature difference range or the operating frequency of the main water pump reaches the upper limit.

[0041] S203. When the first water temperature difference is less than the first preset water temperature difference range, the operating frequency of the main unit water pump is reduced until the first water temperature difference rises to the first preset water temperature difference range or the operating frequency of the main unit water pump reaches the lower limit and then stops.

[0042] In this embodiment, the method for controlling the operating frequency of the main pump to increase or decrease is as follows: the operating frequency of the main pump is increased or decreased by a preset step time interval.

[0043] For ease of understanding, this embodiment uses a specific example: the maximum operating frequency of the main water pump is set to 48Hz, the minimum operating frequency is set to 33Hz, the step time is 60s, the step frequency is set to 1Hz, and the first preset water temperature difference range is 7.5~8.5℃ (the desired standard temperature difference is set to 8℃, with an allowable deviation of ±0.5℃). Based on this setting, when the detected current first water temperature difference is >8.5℃, the operating frequency of the main water pump is increased by 1Hz every 60s until the current first water temperature difference is ≤8.5℃ or the main water pump reaches the maximum operating frequency; when the detected current first water temperature difference is <7.5℃, the operating frequency of the main water pump is decreased by 1Hz every 60s until the current first water temperature difference is ≥7.5℃ or the main water pump reaches the minimum operating frequency.

[0044] Understandably, when the current first water temperature difference is >8.5℃, increasing the operating frequency of the main unit's water pump increases the chilled water flow rate, thereby reducing the cooling time of the chilled water outlet in the cooling tower and thus increasing the temperature of the chilled water outlet to reduce the first water temperature difference. Conversely, when the current first water temperature difference is <7.5℃, decreasing the chilled water flow rate increases the cooling time of the chilled water outlet in the cooling tower, thereby reducing the temperature of the chilled water outlet to increase the first water temperature difference.

[0045] It should be noted that the operating frequency, step time, step frequency, and first preset water temperature difference range of the main water pump in this embodiment can all be adjusted according to actual needs.

[0046] The second-stage temperature difference control process will be described in detail below.

[0047] In one embodiment, such as Figure 3 As shown, step S102 includes:

[0048] S301. Detect the temperature difference of chilled water between the inter-floor water supply pipe and the inter-floor water return pipe to obtain the second water temperature difference;

[0049] S302. When the second water temperature difference is greater than the second preset water temperature difference range, the opening of the interlayer valve is increased until the second water temperature difference drops to the second preset water temperature difference range or the opening of the interlayer valve reaches its maximum.

[0050] S303. When the second water temperature difference is less than the second preset water temperature difference range, the opening degree of the interlayer valve is reduced until the second water temperature difference rises to the second preset water temperature difference range or the opening degree of the interlayer valve reaches the preset minimum opening degree.

[0051] In this embodiment, the method of controlling the opening degree of the interlayer valve to increase or decrease is as follows: the opening degree of the interlayer valve is controlled to increase or decrease by a preset step length frequency every preset step length interval.

[0052] For ease of understanding, this embodiment uses a specific example: The initial opening of the interlayer valve is set to 90%. To ensure minimum flow and reduce water resistance, the minimum opening of the interlayer valve is set to 40%, with a step time of 60 seconds and a step frequency of 10% opening. The second preset water temperature difference range is 6-8℃ (the desired standard temperature difference is set to 7℃, with an allowable deviation of ±1℃). Based on this setting, when the detected current second water temperature difference is >8℃, the interlayer valve is increased by 10% every 60 seconds until the current second water temperature difference is ≤8℃ or the interlayer valve reaches its maximum opening. When the detected current second water temperature difference is <6℃, the valve opening is gradually decreased by 10% every 60 seconds until the current second water temperature difference is ≥6℃ or the interlayer valve reaches its minimum opening.

[0053] Understandably, when the current second water temperature difference is >8℃, the interlayer valve opening is increased to increase the chilled water flow rate, thereby reducing the heat exchange time and avoiding excessive heat exchange; conversely, when the current second water temperature difference is <6℃, the interlayer valve opening is decreased to reduce the chilled water flow rate, thereby increasing the heat exchange time and avoiding low heat exchange efficiency.

[0054] It should be noted that the maximum and minimum opening degree, step time, step frequency and second preset water temperature difference range of the interlayer valve in this embodiment can all be adjusted according to actual needs.

[0055] The third-stage temperature difference control process will be described in detail below.

[0056] In one embodiment, such as Figure 4 As shown, step S103 includes:

[0057] S401. Detect the temperature difference of chilled water between the inter-floor water supply pipe and the terminal return pipe to obtain the third water temperature difference;

[0058] S402. When the third water temperature difference is greater than the third preset water temperature difference range, the opening of the control terminal valve is increased until the third water temperature difference drops to the third preset water temperature difference range or the opening of the terminal valve reaches the maximum level.

[0059] S403. When the third water temperature difference is less than the third preset water temperature difference range, the opening of the control terminal valve is reduced until the third water temperature difference rises to the third preset water temperature difference range or the opening of the terminal valve reaches the minimum position.

[0060] In this embodiment, the opening degree of the terminal valve is controlled to increase or decrease by one level at a preset step time interval.

[0061] For ease of understanding, this embodiment uses a specific example: the terminal valve is driven by a motor to adjust its opening. The terminal valve opening has 5 adjustable levels from 0% to 100%, meaning that the terminal valve is completely closed when the opening is 0%. The motor stroke time corresponding to the opening of the terminal valve from 0% to 25% is 18 seconds, from 25% to 50% is 25 seconds, from 50% to 75% is 32 seconds, and from 75% to 75% is 45 seconds. The third preset water temperature... The temperature difference range is 7 to 9℃ (the desired standard temperature difference is set at 8℃, with an allowable deviation of ±1℃). Based on this setting, when the detected current third water temperature difference is >9℃, the terminal valve gradually increases in increments of one level (i.e., 25% opening) until the current third water temperature difference is ≤9℃ or the terminal valve reaches its maximum level. When the detected current third water temperature difference is <7℃, the terminal valve gradually decreases in increments of one level until the current third water temperature difference is ≥7℃ or the terminal valve reaches its minimum level.

[0062] Understandably, when the current third water temperature difference is >9℃, the terminal valve is upgraded to increase the chilled water flow rate, thereby reducing the heat exchange time and avoiding excessive heat exchange; conversely, when the current third water temperature difference is <7℃, the terminal valve is downgraded to reduce the chilled water flow rate, thereby increasing the heat exchange time and avoiding low heat exchange efficiency.

[0063] It should be noted that the number of valve positions of the end valve in this embodiment, the valve opening degree of each position, and the third preset water temperature difference range can all be adjusted according to actual needs.

[0064] Based on the specific temperature difference control processes at the three levels described above, the stability of the chilled water temperature difference in the entire central air conditioning system can be effectively ensured.

[0065] This invention also provides a chilled water temperature difference control device, which is used to execute any embodiment of the aforementioned chilled water temperature difference control method. Specifically, please refer to... Figure 5 , Figure 5 This is a schematic block diagram of the chilled water temperature difference control device provided in an embodiment of the present invention.

[0066] like Figure 5As shown, the chilled water temperature difference control device 500 includes: a first control unit 501, a second control unit 502 and a third control unit 503.

[0067] The first control unit 501 is used to detect the temperature difference between the chilled water outlet and the chilled water return of the cooling tower, obtain the first water temperature difference, and adjust the operating frequency of the main water pump in the cooling tower based on the change of the first water temperature difference, so as to control the first water temperature difference to be maintained within the first preset water temperature difference range.

[0068] The second control unit 502 is used to detect the chilled water temperature difference between the inter-layer water supply pipe and the inter-layer water return pipe, obtain the second water temperature difference, and adjust the opening of the inter-layer valve between the inter-layer water supply pipe and the inter-layer water return pipe based on the change of the second water temperature difference, so as to control the second water temperature difference to be maintained within the second preset water temperature difference range.

[0069] The third control unit 503 is used to detect the chilled water temperature difference between the inter-floor water supply pipe and the terminal return water pipe, obtain the third water temperature difference, and adjust the opening of the terminal valve between the inter-floor water supply pipe and the terminal return water pipe based on the change of the third water temperature difference, so as to control the third water temperature difference to be maintained within the third preset water temperature difference range.

[0070] This device employs a three-level control scheme to regulate the chilled water flow rate at three different node locations to achieve chilled water temperature difference control. The first level of control adjusts the operating frequency and power of the main water pump in the cooling tower to control the chilled water flow rate. The second level of control adjusts the opening degree of the inter-floor valves to control the chilled water flow rate. The third level of control adjusts the opening degree of the terminal valves to control the chilled water flow rate. Therefore, in scenarios requiring simultaneous cooling of multiple floors, the chilled water temperature difference control method of this application can effectively ensure the stability of the chilled water temperature difference throughout the entire central air conditioning system.

[0071] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described apparatus and unit can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0072] The aforementioned chilled water temperature difference control device can be implemented as a computer program, which can, for example, Figure 6 It runs on the computer device shown.

[0073] Please see Figure 6 , Figure 6 This is a schematic block diagram of a computer device provided in an embodiment of the present invention. The computer device 600 is a server, which can be a standalone server or a server cluster composed of multiple servers.

[0074] See Figure 6 The computer device 600 includes a processor 602, a memory, and a network interface 605 connected via a system bus 601. The memory may include a non-volatile storage medium 603 and internal memory 604.

[0075] The non-volatile storage medium 603 can store an operating system 6031 and a computer program 6032. When the computer program 6032 is executed, it causes the processor 602 to perform a chilled water temperature difference control method.

[0076] The processor 602 provides computing and control capabilities to support the operation of the entire computer device 600.

[0077] The internal memory 604 provides an environment for the operation of the computer program 6032 in the non-volatile storage medium 603. When the computer program 6032 is executed by the processor 602, the processor 602 can execute the chilled water temperature difference control method.

[0078] This network interface 605 is used for network communication, such as providing data transmission. Those skilled in the art will understand that... Figure 6 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device 600 to which the present invention is applied. The specific computer device 600 may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0079] Those skilled in the art will understand that Figure 6 The embodiments of the computer device shown do not constitute a limitation on the specific configuration of the computer device. In other embodiments, the computer device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements. For example, in some embodiments, the computer device may include only memory and a processor. In such embodiments, the structure and function of the memory and processor are different from those shown. Figure 6 The embodiments shown are consistent and will not be repeated here.

[0080] It should be understood that, in this embodiment of the invention, the processor 602 may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0081] In another embodiment of the invention, a computer-readable storage medium is provided. This computer-readable storage medium may be a non-volatile computer-readable storage medium. The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the chilled water temperature difference control method of the embodiments of the present invention.

[0082] The storage medium is a physical, non-transient storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), magnetic disk, or optical disk, etc., which are all physical storage media capable of storing program code.

[0083] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0084] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling the temperature difference of chilled water, characterized in that, include: The temperature difference between the chilled water outlet and chilled water return of the cooling tower is detected to obtain the first water temperature difference. Based on the change of the first water temperature difference, the operating frequency of the main water pump in the cooling tower is adjusted to control the first water temperature difference to be maintained within the first preset water temperature difference range. The temperature difference between the chilled water in the inter-floor water supply pipe and the inter-floor water return pipe is detected to obtain a second water temperature difference. Based on the change of the second water temperature difference, the opening of the inter-floor valve between the inter-floor water supply pipe and the inter-floor water return pipe is adjusted to control the second water temperature difference to be maintained within a second preset water temperature difference range. The temperature difference between the chilled water in the inter-floor water supply pipe and the end return water pipe is detected to obtain a third water temperature difference. Based on the change of the third water temperature difference, the opening of the end valve between the inter-floor water supply pipe and the end return water pipe is adjusted to control the third water temperature difference to be maintained within a third preset water temperature difference range.

2. The chilled water temperature difference control method according to claim 1, characterized in that, The method involves detecting the temperature difference between the inlet and outlet chilled water of the cooling tower to obtain a first water temperature difference, and adjusting the operating frequency of the main water pump in the cooling tower based on the change of the first water temperature difference to control the first water temperature difference to be maintained within a first preset water temperature difference range, including: The temperature difference between the inlet and outlet chilled water of the cooling tower is detected to obtain the first water temperature difference; When the first water temperature difference is greater than the first preset water temperature difference range, the operating frequency of the main water pump is increased until the first water temperature difference drops to the first preset water temperature difference range or the operating frequency of the main water pump reaches the upper limit. When the first water temperature difference is less than the first preset water temperature difference range, the operating frequency of the main water pump is reduced until the first water temperature difference rises to the first preset water temperature difference range or the operating frequency of the main water pump reaches the lower limit.

3. The chilled water temperature difference control method according to claim 2, characterized in that, Also includes: The method for controlling the operating frequency of the main water pump to increase or decrease is as follows: the operating frequency of the main water pump is increased or decreased by a preset step time interval.

4. The chilled water temperature difference control method according to claim 1, characterized in that, The method involves detecting the chilled water temperature difference between the inter-layer water supply pipe and the inter-layer water return pipe to obtain a second water temperature difference, and adjusting the opening of the inter-layer valve between the inter-layer water supply pipe and the inter-layer water return pipe based on the change of the second water temperature difference, so as to control the second water temperature difference to be maintained within a second preset water temperature difference range, including: The second water temperature difference is obtained by detecting the chilled water temperature difference between the inter-floor water supply pipe and the inter-floor water return pipe; When the second water temperature difference is greater than the second preset water temperature difference range, the opening of the interlayer valve is increased until the second water temperature difference drops to the second preset water temperature difference range or the opening of the interlayer valve reaches its maximum. When the second water temperature difference is less than the second preset water temperature difference range, the opening of the interlayer valve is reduced until the second water temperature difference rises to the second preset water temperature difference range or the opening of the interlayer valve reaches the preset minimum opening.

5. The chilled water temperature difference control method according to claim 4, characterized in that, Also includes: The method for controlling the opening degree of the interlayer valve to increase or decrease is as follows: the opening degree of the interlayer valve is increased or decreased by a preset step length frequency every preset step length interval.

6. The chilled water temperature difference control method according to claim 1, characterized in that, The method involves detecting the chilled water temperature difference between the inter-floor water supply pipe and the terminal return pipe to obtain a third water temperature difference, and adjusting the opening of the terminal valve between the inter-floor water supply pipe and the terminal return pipe based on the change of the third water temperature difference, so as to control the third water temperature difference to be maintained within a third preset water temperature difference range, including: The third water temperature difference is obtained by detecting the chilled water temperature difference between the inter-floor water supply pipe and the terminal return pipe; When the third water temperature difference is greater than the third preset water temperature difference range, the opening of the end valve is increased until the third water temperature difference drops to the third preset water temperature difference range or the opening of the end valve reaches the maximum level. When the third water temperature difference is less than the third preset water temperature difference range, the opening of the end valve is controlled to decrease until the third water temperature difference rises to the third preset water temperature difference range or the opening of the end valve reaches the minimum position.

7. The chilled water temperature difference control method according to claim 6, characterized in that, Also includes: The method for controlling the opening degree of the end valve to increase or decrease is as follows: the opening degree of the end valve is increased or decreased by one level at each preset step time interval.

8. A chilled water temperature difference control device, characterized in that, include: The first control unit is used to detect the temperature difference between the chilled water outlet and the chilled water return of the cooling tower, obtain the first water temperature difference, and adjust the operating frequency of the main water pump in the cooling tower based on the change of the first water temperature difference, so as to control the first water temperature difference to be maintained within the first preset water temperature difference range. The second control unit is used to detect the chilled water temperature difference between the inter-layer water supply pipe and the inter-layer water return pipe, obtain the second water temperature difference, and adjust the opening of the inter-layer valve between the inter-layer water supply pipe and the inter-layer water return pipe based on the change of the second water temperature difference, so as to control the second water temperature difference to be maintained within the second preset water temperature difference range. The third control unit is used to detect the chilled water temperature difference between the inter-floor water supply pipe and the terminal return water pipe, obtain the third water temperature difference, and adjust the opening of the terminal valve between the inter-floor water supply pipe and the terminal return water pipe based on the change of the third water temperature difference, so as to control the third water temperature difference to be maintained within the third preset water temperature difference range.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the chilled water temperature difference control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, causes the processor to perform the chilled water temperature difference control method as described in any one of claims 1 to 7.

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