Method and device for controlling outlet superheat of evaporator, electronic equipment and storage medium

Abstract

The application discloses a kind of evaporator outlet superheat degree control method, device, electronic equipment and storage medium.Therein method includes: obtaining evaporator inlet pressure, evaporator inlet supercooling, evaporator outlet pressure and compressor speed;In the case where evaporator inlet pressure meets preset pressure threshold and evaporator inlet supercooling meets preset supercooling, according to evaporator outlet temperature preset target value and evaporator outlet superheat degree preset target value, calculate evaporator outlet saturation temperature target value;Evaporator outlet saturation temperature target value is converted into evaporator outlet saturation pressure target value;According to evaporator outlet pressure and evaporator outlet saturation pressure target value, adjust compressor speed, so that evaporator outlet pressure meets evaporator outlet saturation pressure target value.The application effectively reduces the coupling between control indicators, improves the control ability of equipment, meets the simultaneous control of customer control indicators refrigeration demand.

Description

Technical Field

[0001] This invention relates to the field of test chamber control technology, and in particular to a method, device, electronic equipment and storage medium for controlling the superheat of the evaporator outlet. Background Technology

[0002] In some special refrigeration equipment, it is necessary to simultaneously control the evaporator inlet pressure, evaporator inlet subcooling, and evaporator outlet superheat.

[0003] Currently, the control of evaporator outlet superheat is achieved by adjusting the opening of the evaporator inlet valve. However, since there is a strong coupling between evaporator inlet pressure, evaporator inlet subcooling, and evaporator outlet superheat, controlling the evaporator outlet superheat through the above method will inevitably cause changes in evaporator inlet pressure and evaporator inlet subcooling. Obviously, adjusting the opening of the evaporator inlet valve cannot achieve the goal of simultaneous control. Summary of the Invention

[0004] This invention provides a method, apparatus, electronic device, and storage medium for controlling the superheat of the evaporator outlet, in order to solve the problem of fluctuations in evaporator inlet pressure and subcooling caused by adjusting the valve opening at the evaporator inlet in the prior art. This invention aims to meet the customer's refrigeration needs for simultaneous control of evaporator inlet pressure, evaporator inlet subcooling, and evaporator outlet superheat.

[0005] According to one aspect of the present invention, a method for controlling the superheat at the outlet of an evaporator is provided, comprising:

[0006] Obtain the evaporator inlet pressure, evaporator inlet subcooling, evaporator outlet pressure, and compressor speed;

[0007] When the evaporator inlet pressure meets the preset pressure threshold and the evaporator inlet subcooling meets the preset subcooling, the target value of the evaporator outlet saturation temperature is calculated based on the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat.

[0008] Convert the target value of the evaporator outlet saturation temperature into the target value of the evaporator outlet saturation pressure;

[0009] The compressor speed is adjusted according to the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0010] Optionally, adjusting the compressor speed according to the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure to make the evaporator outlet pressure meet the target value of the evaporator outlet saturation pressure includes:

[0011] Based on the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure, the target speed of the compressor is determined using a PID control algorithm.

[0012] The compressor speed is adjusted according to the target speed so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0013] Optionally, calculating the target value of the evaporator outlet saturation temperature based on the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat includes:

[0014] The target value of the evaporator outlet saturation temperature is determined by the difference between the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat.

[0015] Optionally, the control method further includes:

[0016] When the evaporator inlet pressure does not meet the preset pressure threshold and the evaporator inlet subcooling does not meet the preset subcooling, the condenser fan speed and the electronic expansion valve opening are obtained.

[0017] The condenser fan speed is adjusted according to the evaporator inlet pressure and the preset pressure threshold so that the evaporator inlet pressure meets the preset pressure threshold.

[0018] The opening of the electronic expansion valve is adjusted according to the evaporator inlet subcooling and the preset subcooling, so that the evaporator inlet subcooling meets the preset subcooling.

[0019] Optionally, adjusting the condenser fan speed according to the evaporator inlet pressure and a preset pressure threshold to ensure the evaporator inlet pressure meets the preset pressure threshold includes:

[0020] Based on the evaporator inlet pressure and the preset pressure threshold, the target speed of the condenser fan is determined using a PID control algorithm.

[0021] The condenser fan speed is adjusted according to the target speed of the condenser fan so that the evaporator inlet pressure meets the preset pressure threshold.

[0022] Optionally, adjusting the opening of the electronic expansion valve according to the evaporator inlet subcooling and the preset subcooling, so that the evaporator inlet subcooling meets the preset subcooling, includes:

[0023] Based on the evaporator inlet subcooling and the preset subcooling, the target opening degree of the electronic expansion valve is determined using a PID control algorithm.

[0024] Adjust the opening of the electronic expansion valve according to the target opening of the electronic expansion valve so that the subcooling of the evaporator inlet meets the preset subcooling.

[0025] According to another aspect of the present invention, a device for controlling the superheat at the outlet of an evaporator is provided, comprising:

[0026] The acquisition module is used to acquire the evaporator inlet pressure, evaporator inlet subcooling, evaporator outlet pressure, and compressor speed.

[0027] The calculation module is used to calculate the target value of the evaporator outlet saturation temperature based on the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat, when the evaporator inlet pressure meets the preset pressure threshold and the evaporator inlet subcooling meets the preset subcooling.

[0028] A conversion module is used to convert the target value of the evaporator outlet saturation temperature into a target value of the evaporator outlet saturation pressure.

[0029] The regulating module is used to adjust the compressor speed according to the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure, so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0030] Optionally, the adjustment module includes a determining submodule and an adjustment submodule;

[0031] The determining submodule is used to determine the target speed of the compressor based on the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure, using a PID control algorithm.

[0032] The regulating submodule is used to adjust the compressor speed according to the target speed so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0033] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0034] At least one processor; and

[0035] A memory communicatively connected to the at least one processor; wherein,

[0036] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the evaporator outlet superheat control method according to any embodiment of the present invention.

[0037] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement a method for controlling evaporator outlet superheat as described in any embodiment of the present invention.

[0038] This invention provides a method, apparatus, electronic device, and storage medium for controlling the superheat at the evaporator outlet. The method includes: acquiring the evaporator inlet pressure, evaporator inlet subcooling, evaporator outlet pressure, and compressor speed; calculating a target value for the evaporator outlet saturation temperature based on preset target values ​​for the evaporator outlet temperature and evaporator outlet superheat, provided that the evaporator inlet pressure and evaporator inlet subcooling both meet a preset pressure threshold; converting the target value for the evaporator outlet saturation temperature into a target value for the evaporator outlet saturation pressure; and adjusting the compressor speed according to the evaporator outlet pressure and the target value for the evaporator outlet saturation pressure, so that the evaporator outlet pressure meets the target value for the evaporator outlet saturation pressure. The technical solution provided by this invention addresses the issue that, since the evaporator outlet superheat is equal to the difference between the evaporator outlet temperature and the evaporator outlet saturation temperature calculated from the evaporator outlet saturation pressure, when the evaporator inlet pressure meets a preset pressure threshold and the evaporator inlet subcooling meets a preset subcooling, the target value of the evaporator outlet saturation temperature is calculated based on the preset target values ​​of the evaporator outlet temperature and the evaporator outlet superheat. This target value is then converted into a target value of the evaporator outlet saturation pressure. By adjusting the compressor speed, the evaporator outlet pressure is controlled, thereby achieving the goal of controlling the evaporator outlet superheat. This effectively reduces the coupling between the evaporator inlet pressure, the evaporator inlet subcooling, and the evaporator outlet superheat, improves the equipment's control capability, and meets the customer's refrigeration requirements for simultaneous control of the evaporator inlet pressure, the evaporator inlet subcooling, and the evaporator outlet superheat.

[0039] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 A flowchart illustrating a method for controlling evaporator outlet superheat according to an embodiment of the present invention;

[0042] Figure 2 A flowchart illustrating another method for controlling evaporator outlet superheat according to an embodiment of the present invention;

[0043] Figure 3 A flowchart illustrating another method for controlling evaporator outlet superheat provided in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of a device for controlling the superheat at the outlet of an evaporator, provided in an embodiment of the present invention.

[0045] Figure 5 A schematic diagram of the electronic device used to implement the method for controlling the superheat at the evaporator outlet provided in this embodiment of the invention. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0048] Figure 1 This is a flowchart illustrating a method for controlling evaporator outlet superheat according to an embodiment of the present invention. This embodiment is applicable to situations where evaporator inlet pressure, evaporator inlet subcooling, and evaporator outlet superheat are simultaneously controlled. The method can be executed by a device controlling evaporator outlet superheat, which can be implemented in hardware and / or software and can be configured in any electronic device with communication capabilities. See also... Figure 1 The control method includes:

[0049] S110: Obtain evaporator inlet pressure, evaporator inlet subcooling, evaporator outlet pressure, and compressor speed.

[0050] Specifically, the evaporator inlet pressure is collected by a pressure sensor at the evaporator inlet; the evaporator inlet subcooling is collected by a temperature sensor at the evaporator inlet; the evaporator outlet pressure is collected by a pressure sensor at the evaporator outlet; and the compressor speed can be obtained by reading data from the compressor control box.

[0051] S120. When the evaporator inlet pressure meets the preset pressure threshold and the evaporator inlet subcooling meets the preset subcooling, calculate the target value of the evaporator outlet saturation temperature based on the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat.

[0052] Among them, the preset pressure threshold, preset subcooling value, preset target value of evaporator outlet temperature, and preset target value of evaporator outlet superheat are all preset based on the product's performance indicators and customer needs.

[0053] Specifically, when the evaporator inlet pressure meets a preset pressure threshold and the evaporator inlet subcooling meets a preset subcooling, the target value of the evaporator outlet saturation temperature is calculated according to preset calculation rules. These preset calculation rules include subtracting the preset target value of the evaporator outlet temperature from the preset target value of the evaporator outlet superheat.

[0054] S130: Convert the target value of evaporator outlet saturation temperature into the target value of evaporator outlet saturation pressure.

[0055] Specifically, the target value of the evaporator outlet saturation temperature is converted into the target value of the evaporator outlet saturation pressure according to the following formula.

[0056] P = ka + kb × lnVal + kc × lnVal 2 +kd×lnVal 3 +ke×lnVal 4 +kf×lnVal 5 ;Mode

[0057] In this context, P represents the target saturation pressure at the evaporator outlet, ka, kb, kc, kd, ke, and kf are constant coefficients determined based on the type of refrigerant; different types of refrigerants correspond to different coefficients. Inval represents the target saturation temperature at the evaporator outlet, and lnVal... 2 lnVal is the square of the target saturation temperature at the evaporator outlet. 3 lnVal is the cube of the target saturation temperature at the evaporator outlet. 4 lnVal is the fourth power of the target saturation temperature at the evaporator outlet. 5It is the fifth power of the target value of the evaporator outlet saturation temperature.

[0058] S140. Adjust the compressor speed according to the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0059] Specifically, the evaporator outlet pressure is compared with the target value of the evaporator outlet saturation pressure. When the evaporator outlet pressure is less than the target value, it indicates that the compressor speed is high. A higher compressor speed means that the compressor's intake volume per unit time is increased. Therefore, the compressor speed needs to be reduced, resulting in a lower intake volume per unit time. This can increase the evaporator outlet pressure and reduce the evaporator outlet superheat, so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure. Conversely, when the evaporator outlet pressure is greater than the target value, it indicates that the compressor speed is low. A lower compressor speed means that the compressor's intake volume per unit time is reduced. Therefore, the compressor speed needs to be increased, resulting in a higher intake volume per unit time. This can decrease the evaporator outlet pressure and increase the evaporator outlet superheat, so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0060] The technical solution provided by this invention addresses the issue that, since the evaporator outlet superheat is equal to the difference between the evaporator outlet temperature and the evaporator outlet saturation temperature calculated from the evaporator outlet saturation pressure, when the evaporator inlet pressure meets a preset pressure threshold and the evaporator inlet subcooling meets a preset subcooling, a target value for the evaporator outlet saturation temperature is calculated based on the preset target values ​​for the evaporator outlet temperature and the evaporator outlet superheat. This target value is then converted into a target value for the evaporator outlet saturation pressure. By adjusting the compressor speed, the evaporator outlet pressure is controlled, thereby achieving the goal of controlling the evaporator outlet superheat. This effectively reduces the coupling between the evaporator inlet pressure, evaporator inlet subcooling, and evaporator outlet superheat, improves the equipment's control capability, and meets the customer's refrigeration requirements for simultaneous control of the evaporator inlet pressure, evaporator inlet subcooling, and evaporator outlet superheat.

[0061] Figure 2 This is a flowchart illustrating another method for controlling evaporator outlet superheat according to an embodiment of the present invention. This embodiment further refines the aforementioned embodiments. See also... Figure 2 The control method includes:

[0062] S210: Obtain evaporator inlet pressure, evaporator inlet subcooling, evaporator outlet pressure, and compressor speed.

[0063] This step is the same as the method step in the above embodiment S110, and will not be repeated here.

[0064] S220. When the evaporator inlet pressure meets the preset pressure threshold and the evaporator inlet subcooling meets the preset subcooling, the difference between the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat is used to determine the target value of the evaporator outlet saturation temperature.

[0065] Specifically, since the evaporator outlet superheat is equal to the difference between the evaporator outlet temperature and the evaporator outlet saturation temperature calculated from the evaporator outlet saturation pressure, reflecting the mapping relationship between the evaporator outlet superheat and the evaporator outlet pressure, the difference between the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat is used to determine the target value of the evaporator outlet saturation temperature. This allows the target value of the evaporator outlet saturation temperature to be converted into the target value of the evaporator outlet saturation pressure, further controlling the evaporator outlet pressure, thereby achieving the purpose of controlling the evaporator outlet superheat.

[0066] S230: Convert the target value of evaporator outlet saturation temperature into the target value of evaporator outlet saturation pressure.

[0067] This step is the same as the method step in the above embodiment S130, and will not be described again here.

[0068] S240. Based on the target values ​​of evaporator outlet pressure and evaporator outlet saturation pressure, determine the target speed of the compressor using a PID control algorithm.

[0069] Specifically, the target values ​​of evaporator outlet pressure and evaporator outlet saturation pressure are used as inputs to the PID control algorithm (Proportion Integral Differential, PID), and the output represents a percentage of the compressor's target speed. This percentage is then converted into the compressor's target speed using the following formula.

[0070] The output of the engineering quantity is calculated as: Percentage × [(Upper Limit of Engineering Quantity - Lower Limit of Engineering Quantity) × (Upper Limit of Percentage = Lower Limit of Percentage)] + Lower Limit of Engineering Quantity. It should be noted that the output of the engineering quantity here represents the target speed of the compressor. The upper and lower limits of the engineering quantity can be determined based on the performance parameters of the compressor type; different types of compressors have different upper and lower limits for their speeds. The upper and lower limits of the percentage are 0%-100%. The PID calculation output is a real number.

[0071] S250. Adjust the compressor speed according to the target speed so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0072] Specifically, the target speed of the compressor is sent to the compressor controller, which adjusts the compressor speed according to the target speed so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0073] The technical solution provided by this invention uses a PID control algorithm to adjust the compressor speed, thereby controlling the evaporator outlet pressure and achieving the goal of controlling the evaporator outlet superheat. This further reduces the coupling between the evaporator inlet pressure, the evaporator inlet subcooling, and the evaporator outlet superheat.

[0074] Figure 3 This is a flowchart illustrating another method for controlling evaporator outlet superheat according to an embodiment of the present invention. This embodiment further refines the aforementioned embodiments based on the previous ones. See also... Figure 3 The control method includes:

[0075] S310: Obtain evaporator inlet pressure, evaporator inlet subcooling, evaporator outlet pressure, and compressor speed.

[0076] This step is the same as the method step in the above embodiment S110, and will not be repeated here.

[0077] S320. When the evaporator inlet pressure does not meet the preset pressure threshold and the evaporator inlet subcooling does not meet the preset subcooling, obtain the condenser fan speed and the electronic expansion valve opening.

[0078] S330. Adjust the condenser fan speed according to the evaporator inlet pressure and the preset pressure threshold so that the evaporator inlet pressure meets the preset pressure threshold.

[0079] Optionally, adjusting the condenser fan speed according to the evaporator inlet pressure and a preset pressure threshold to ensure the evaporator inlet pressure meets the preset pressure threshold includes:

[0080] Based on the evaporator inlet pressure and the preset pressure threshold, the target speed of the condenser fan is determined using a PID control algorithm.

[0081] Specifically, the evaporator inlet pressure and the preset pressure threshold are used as inputs to the PID control algorithm, and the output represents a percentage of the target speed of the condenser fan. This percentage is then converted into the target speed of the condenser fan using the following formula.

[0082] The output of the process quantity is calculated as: Percentage × [(Upper Limit of Process Quantity - Lower Limit of Process Quantity) × (Upper Limit of Percentage = Lower Limit of Percentage)] + Lower Limit of Process Quantity. It should be noted that the output of the process quantity here represents the target speed of the condenser fan. The upper and lower limits of the process quantity can be determined based on the performance parameters of the condenser fan type; different types of condenser fans have different upper and lower limits for their speeds. The upper and lower limits of the percentage are 0%-100%. The PID calculation output is a real number.

[0083] Adjust the condenser fan speed according to the target condenser fan speed so that the evaporator inlet pressure meets the preset pressure threshold.

[0084] Specifically, the target speed of the condenser fan is sent to the condenser fan controller. The condenser fan controller adjusts the condenser fan speed according to the target speed to ensure that the evaporator inlet pressure meets the preset pressure threshold. The higher the condenser fan speed, the more heat is exchanged per unit time, and the lower the evaporator inlet pressure. Therefore, when the evaporator inlet pressure is lower than the preset pressure threshold, the condenser fan speed needs to be reduced; when the evaporator inlet pressure is higher than the preset pressure threshold, the condenser fan speed needs to be increased.

[0085] S340. Adjust the opening of the electronic expansion valve according to the evaporator inlet subcooling and the preset subcooling, so that the evaporator inlet subcooling meets the preset subcooling.

[0086] Optionally, the opening of the electronic expansion valve is adjusted according to the evaporator inlet subcooling and the preset subcooling to ensure that the evaporator inlet subcooling meets the preset subcooling, including:

[0087] Based on the evaporator inlet subcooling and the preset subcooling, the target opening degree of the electronic expansion valve is determined using a PID control algorithm.

[0088] Specifically, the evaporator inlet subcooling and the preset subcooling are used as inputs to the PID control algorithm, and the output represents the percentage of the target opening of the electronic expansion valve. This percentage is then converted into the target opening of the electronic expansion valve using the following formula.

[0089] The output quantity is calculated as follows: Output Quantity = Percentage × [(Upper Limit of Quantity - Lower Limit of Quantity) × (Upper Limit of Percentage = Lower Limit of Percentage)] + Lower Limit of Quantity. It should be noted that the output quantity here represents the target opening degree of the electronic expansion valve. The upper and lower limits of the quantity can be determined based on the performance parameters of the electronic expansion valve type. Different types of electronic expansion valves have different upper and lower limits for their opening degrees. The percentage upper and lower limits are 0%-100%. The PID calculation output is a real number.

[0090] Adjust the opening of the electronic expansion valve according to the target opening degree to ensure that the subcooling at the evaporator inlet meets the preset subcooling degree.

[0091] Specifically, the larger the opening of the electronic expansion valve, the more refrigerant flows through, and the greater the subcooling at the evaporator inlet. Conversely, the smaller the opening of the electronic expansion valve, the less refrigerant flows through, and the smaller the subcooling at the evaporator inlet. Therefore, when the opening of the electronic expansion valve is less than the target opening, the opening needs to be increased; when the opening of the electronic expansion valve is greater than the target opening, the opening needs to be decreased.

[0092] S350. When the evaporator inlet pressure meets the preset pressure threshold and the evaporator inlet subcooling meets the preset subcooling, calculate the target value of the evaporator outlet saturation temperature based on the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat.

[0093] This step is the same as the method step in the above embodiment S120, and will not be described again here.

[0094] S360: Convert the target value of evaporator outlet saturation temperature to the target value of evaporator outlet saturation pressure.

[0095] This step is the same as the method step in the above embodiment S130, and will not be described again here.

[0096] S370. Adjust the compressor speed according to the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0097] This step is the same as the method step in the above embodiment S140, and will not be repeated here.

[0098] The technical solution provided by the embodiments of the present invention is applicable to all equipment that requires independent control of evaporator inlet pressure, evaporator inlet subcooling, and evaporator outlet superheat. This equipment uses a variable frequency compressor, which can arbitrarily set the upper and lower limits of the control parameters, resulting in high flexibility and better energy saving.

[0099] Figure 4 This is a schematic diagram of a device for controlling the superheat at the evaporator outlet according to an embodiment of the present invention. (See attached diagram.) Figure 4 The control device includes an acquisition module 410, a calculation module 420, a conversion module 430, and an adjustment module 440.

[0100] The acquisition module 410 is used to acquire the evaporator inlet pressure, evaporator inlet subcooling, evaporator outlet pressure, and compressor speed.

[0101] The calculation module 420 is used to calculate the target value of the evaporator outlet saturation temperature based on the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat, provided that the evaporator inlet pressure meets the preset pressure threshold and the evaporator inlet subcooling meets the preset subcooling.

[0102] The conversion module 430 is used to convert the target value of the evaporator outlet saturation temperature into the target value of the evaporator outlet saturation pressure.

[0103] The regulating module 440 is used to adjust the compressor speed according to the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure, so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0104] Optionally, the adjustment module includes a determination submodule and an adjustment submodule;

[0105] The determination submodule is used to determine the target speed of the compressor based on the target values ​​of the evaporator outlet pressure and the evaporator outlet saturation pressure, using a PID control algorithm.

[0106] The regulating submodule is used to adjust the compressor speed according to the target speed so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

[0107] The evaporator outlet superheat control device provided in this embodiment of the invention can execute the evaporator outlet superheat control method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0108] Figure 5 This is a schematic diagram of an electronic device for implementing a method for controlling the superheat at the evaporator outlet provided in an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0109] like Figure 5As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0110] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0111] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the evaporator outlet superheat control method.

[0112] In some embodiments, the evaporator outlet superheat control method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the evaporator outlet superheat control method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the evaporator outlet superheat control method by any other suitable means (e.g., by means of firmware).

[0113] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0114] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0115] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0116] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0117] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0118] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0119] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0120] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for controlling the superheat at the evaporator outlet, characterized in that, include: Obtain the evaporator inlet pressure, evaporator inlet subcooling, evaporator outlet pressure, and compressor speed; When the evaporator inlet pressure meets the preset pressure threshold and the evaporator inlet subcooling meets the preset subcooling, the target value of the evaporator outlet saturation temperature is calculated based on the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat. Convert the target value of the evaporator outlet saturation temperature into the target value of the evaporator outlet saturation pressure; The compressor speed is adjusted according to the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

2. The control method according to claim 1, characterized in that, The step of adjusting the compressor speed according to the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure, so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure, includes: Based on the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure, the target speed of the compressor is determined using a PID control algorithm. The compressor speed is adjusted according to the target speed so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

3. The control method according to claim 1, characterized in that, The calculation of the target value for the evaporator outlet saturation temperature based on the preset target value for the evaporator outlet temperature and the preset target value for the evaporator outlet superheat includes: The target value of the evaporator outlet saturation temperature is determined by the difference between the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat.

4. The control method according to claim 1, characterized in that, Also includes: When the evaporator inlet pressure does not meet the preset pressure threshold and the evaporator inlet subcooling does not meet the preset subcooling, the condenser fan speed and the electronic expansion valve opening are obtained. The condenser fan speed is adjusted according to the evaporator inlet pressure and the preset pressure threshold so that the evaporator inlet pressure meets the preset pressure threshold. The opening of the electronic expansion valve is adjusted according to the evaporator inlet subcooling and the preset subcooling, so that the evaporator inlet subcooling meets the preset subcooling.

5. The control method according to claim 4, characterized in that, The step of adjusting the condenser fan speed according to the evaporator inlet pressure and a preset pressure threshold, so that the evaporator inlet pressure meets the preset pressure threshold, includes: Based on the evaporator inlet pressure and the preset pressure threshold, the target speed of the condenser fan is determined using a PID control algorithm. The condenser fan speed is adjusted according to the target speed of the condenser fan so that the evaporator inlet pressure meets the preset pressure threshold.

6. The control method according to claim 4, characterized in that, The step of adjusting the opening of the electronic expansion valve according to the evaporator inlet subcooling and the preset subcooling, so that the evaporator inlet subcooling meets the preset subcooling, includes: Based on the evaporator inlet subcooling and the preset subcooling, the target opening degree of the electronic expansion valve is determined using a PID control algorithm. Adjust the opening of the electronic expansion valve according to the target opening of the electronic expansion valve so that the subcooling of the evaporator inlet meets the preset subcooling.

7. A device for controlling the superheat at the outlet of an evaporator, characterized in that, include: The acquisition module is used to acquire the evaporator inlet pressure, evaporator inlet subcooling, evaporator outlet pressure, and compressor speed. The calculation module is used to calculate the target value of the evaporator outlet saturation temperature based on the preset target value of the evaporator outlet temperature and the preset target value of the evaporator outlet superheat, when the evaporator inlet pressure meets the preset pressure threshold and the evaporator inlet subcooling meets the preset subcooling. A conversion module is used to convert the target value of the evaporator outlet saturation temperature into a target value of the evaporator outlet saturation pressure. The regulating module is used to adjust the compressor speed according to the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure, so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

8. The control device according to claim 7, characterized in that, The adjustment module includes a determination submodule and an adjustment submodule; The determining submodule is used to determine the target speed of the compressor based on the evaporator outlet pressure and the target value of the evaporator outlet saturation pressure, using a PID control algorithm. The regulating submodule is used to adjust the compressor speed according to the target speed so that the evaporator outlet pressure meets the target value of the evaporator outlet saturation pressure.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor to enable the at least one processor to perform the method for controlling the evaporator outlet superheat according to any one of claims 1-6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement a method for controlling the superheat at the evaporator outlet according to any one of claims 1-6.

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