Energy-saving refrigerating system, method, device and medium

Abstract

The embodiment of the invention provides an energy-saving refrigerating system, method and device and a medium, the system comprises a first unit, a second unit, a plurality of internal environment testing rooms, a plurality of external environment testing rooms and a processor, and the processor is configured to obtain the current working conditions and the target working conditions of the testing rooms to be regulated and controlled; based on the current working condition and the target working condition, a first estimated heat energy value of the first unit and a second estimated heat energy value of the second unit are determined; and based on the current working condition, the target working condition, the first estimated heat energy value and the second estimated heat energy value, a first regulation and control parameter of the first unit and a second regulation and control parameter of the second unit are determined.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to an energy-saving refrigeration system, method, device and medium. Background Art

[0002] The enthalpy difference test room can be used to measure the cooling capacity and / or heating capacity of related equipment or systems. However, the enthalpy difference laboratory has high requirements for the stability of the test conditions.

[0003] At present, enthalpy difference laboratories mostly stabilize test conditions by means of heat and moisture balance, that is, excessive cooling is injected into the test room through a cold source to achieve the purpose of cooling, and then the excess cooling is offset by a heat source. This process consumes huge energy.

[0004] In addition, the stepless regulation of the cold source is mostly achieved by compressor frequency conversion. However, the cooling capacity regulation performance of the compressor frequency conversion method is poor and cannot meet the requirements of the enthalpy difference laboratory for working condition stability. In addition, the adjustment range of the cold source is small and it cannot work normally under extremely high and low temperature conditions. Therefore, how to achieve energy saving in the enthalpy difference laboratory while ensuring stable operation is an urgent problem to be solved.

[0005] In order to solve the above problems, some embodiments of the present specification provide an energy-saving refrigeration system, method, device and medium. By taking into account high and low temperatures, stepless adjustment of cooling capacity, adjustable evaporation pressure, and coordinated cooling and heating, a parallel centralized cooling station can reduce energy consumption and improve the operating stability of the cold source group while meeting the cooling needs of multiple spaces. Summary of the invention

[0006] One or more embodiments of the present specification provide an energy-saving refrigeration system, the system comprising a first unit, a second unit, a plurality of internal environment test rooms, a plurality of external environment test rooms and a processor; the first unit comprises a plurality of first compressors, a plurality of first heat exchangers and a plurality of first evaporators connected in parallel, the exhaust pipe of the first compressor is connected to the first heat exchanger, one end of the first evaporator is connected to the first heat exchanger, the other end of the first evaporator is connected to the first compressor, and an electronic expansion valve is arranged at the front end of the inlet of the first evaporator connected to the first heat exchanger; the first unit is configured to regulate the working conditions in the plurality of internal environment test rooms; the second unit comprises a plurality of second compressors, a plurality of second heat exchangers and a plurality of second evaporators connected in parallel, the exhaust pipe of the second compressor is connected to the second heat exchanger , one end of the second evaporator is connected to the second heat exchanger, the other end of the second evaporator is connected to the second compressor, and an electronic expansion valve is arranged at the front end of the inlet of the second evaporator connected to the second heat exchanger; the second unit is configured to regulate the working conditions in multiple external environment test rooms; the processor is configured to: obtain the current working conditions and target working conditions of multiple test rooms to be regulated; based on the current working conditions and the target working conditions, determine the first estimated thermal energy value of the first unit and the second estimated thermal energy value of the second unit; based on the current working conditions, the target working conditions, the first estimated thermal energy value and the second estimated thermal energy value, determine the first regulation parameter of the first unit and the second regulation parameter of the second unit, the first regulation parameter includes the first heating parameter of the first heat exchanger, and the second regulation parameter includes the second heating parameter of the second heat exchanger.

[0007] One or more embodiments of the present specification provide an energy-saving refrigeration method. The method is executed by a processor, and includes: obtaining current working conditions and target working conditions of multiple test rooms to be regulated; determining a first estimated heat energy value of a first unit and a second estimated heat energy value of a second unit based on the current working conditions and the target working conditions; determining a first control parameter of the first unit and a second control parameter of the second unit based on the current working conditions, the target working conditions, the first estimated heat energy value and the second estimated heat energy value, wherein the first control parameter includes a first heating parameter of a first heat exchanger, and the second control parameter includes a second heating parameter of a second heat exchanger.

[0008] One or more embodiments of the present specification provide an energy-saving refrigeration device, which includes multiple units, each unit includes multiple compressors running in parallel, and the compressor is configured to be mechanically connected to a heat recovery heat exchanger, an evaporator, and a condenser through multiple pipelines; the multiple pipelines include a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline, and the multiple pipelines are mechanically connected; the first pipeline is equipped with a first pressure regulating valve, a second pressure regulating valve, a temperature regulating valve, and a pressure difference regulating valve; the second pipeline is equipped with a first automatic ball valve and a third automatic ball valve; the third pipeline is equipped with a second automatic ball valve; the fourth pipeline is equipped with a fourth automatic ball valve; the first pressure regulating valve is configured to control the refrigerant pressure in the evaporator; the second pressure regulating valve is configured to control the suction pressure of the compressor; the temperature control valve Configured to control the suction temperature of the compressor; the first automatic ball valve, the second automatic ball valve, the third automatic ball valve and the fourth automatic ball valve are configured to control the flow direction of the refrigerant; the evaporator includes one or more indoor evaporators and one or more outdoor evaporators; the indoor evaporator is configured with a high-temperature expansion valve; the outdoor evaporator is configured with a high-temperature expansion valve; the high-temperature expansion valve and the high-temperature expansion valve are configured to control the refrigerant flow entering the evaporator; the heat recovery heat exchanger includes an indoor heat exchanger and an outdoor heat exchanger, the indoor heat exchanger is configured with a first heat exchange valve, and the outdoor heat exchanger is configured with a second heat exchange valve; the first heat exchange valve and the second heat exchange valve are configured to change the refrigerant flow entering the heat recovery heat exchanger by controlling the valve opening; the condenser is configured with a water flow regulating valve, and the water flow regulating valve is configured to adjust the refrigerant flow.

[0009] One or more embodiments of the present specification provide a computer-readable storage medium, wherein the storage medium stores computer instructions. When a computer reads the computer instructions in the storage medium, the computer executes an energy-saving refrigeration method. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0011] Figure 1 is a system structure diagram of an energy-saving refrigeration system according to some embodiments of this specification;

[0012] Figure 2 is an exemplary flow chart of an energy-saving refrigeration method according to some embodiments of this specification;

[0013] Figure 3 is an exemplary flow chart for determining the first control parameter and the second control parameter according to some embodiments of this specification;

[0014] Figure 4is an exemplary schematic diagram of determining the first control parameter and the second control parameter according to some embodiments of this specification;

[0015] Figure 5 It is a schematic diagram of the structure of an energy-saving refrigeration device according to some embodiments of the present specification. DETAILED DESCRIPTION

[0016] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0017] It should be understood that the "system", "device", "unit" and / or "module" used herein are a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0018] As shown in this specification and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0019] Flowcharts are used in this specification to illustrate the operations performed by the system according to the embodiments of this specification. It should be understood that the preceding or following operations are not necessarily performed precisely in order. Instead, the steps may be processed in reverse order or simultaneously. At the same time, other operations may also be added to these processes, or one or more operations may be removed from these processes.

[0020] Figure 1 is a system structure diagram of an energy-saving refrigeration system according to some embodiments of this specification. Figure 1 As shown, the energy-saving refrigeration system 100 includes a first unit 110, a second unit 120, multiple internal environment test rooms (such as internal environment test rooms 130-1,..., internal environment test room 130-m), multiple external environment test rooms (such as external environment test rooms 140-1,..., external environment test room 140-n) and a processor 150.

[0021] The first machine group 110 refers to a combination of multiple machines used to control the internal environment test room. Figure 1 As shown, the first unit 110 may be configured to regulate the operating conditions within a plurality of internal environmental test rooms (including internal environmental test rooms 130 - 1 , . . . , internal environmental test room 130 - m).

[0022] The working condition refers to the working state of the equipment or system and the working environment conditions, such as the temperature and humidity of the test room.

[0023] In some embodiments, Figure 1 As shown, the first unit 110 includes multiple parallel first compressors (such as the first compressor 111-1, ..., the first compressor 111-m), multiple first heat exchangers (such as the first heat exchanger 112-1, ..., the first heat exchanger 112-m) and multiple first evaporators (such as the first evaporator 113-1, ..., the first evaporator 113-m).

[0024] The first compressor refers to the equipment used to compress refrigerant in the internal environment test room, such as reciprocating compressors, centrifugal compressors, etc.

[0025] Refrigerant refers to a substance that can be used for refrigeration, such as ammonia, sulfur dioxide, methane, etc.

[0026] In some embodiments, the first compressor sucks low-temperature and low-pressure liquid refrigerant from the suction pipe, compresses the liquid refrigerant, and discharges high-temperature and high-pressure gaseous refrigerant through the exhaust pipe. During the refrigerant compression process of the first compressor, a large amount of heat energy is generated.

[0027] The first heat exchanger refers to the equipment that exchanges heat with the internal environment test room, such as shell and tube heat exchanger, double-tube heat exchanger, etc.

[0028] In some embodiments, in combination Figure 1 As shown, the exhaust pipe of the first compressor 111-m can be connected to the first heat exchanger 112-m to condense the high-temperature and high-pressure gaseous refrigerant entering the first heat exchanger 112-m, and recover the heat energy released during the condensation process to heat the internal environment test room 130-m when needed, so as to achieve energy-saving effect.

[0029] In some embodiments, the first heat exchanger is further provided with a refrigerant inlet, through which refrigerant can be added into the first heat exchanger to accelerate the condensation of the refrigerant and recover heat energy.

[0030] Refrigerant refers to the medium used to transfer heat energy, such as cooling water.

[0031] In some embodiments, a first control valve is disposed at the refrigerant inlet of the first heat exchanger.

[0032] The first control valve is a valve used to control the refrigerant entering the first heat exchanger. For example, an electromagnetically controlled valve, an electromagnetically hydraulically controlled valve, etc. In some embodiments, the opening of the first control valve can control the flow of the refrigerant entering the first heat exchanger to achieve stepless regulation of the condensing capacity of the first heat exchanger.

[0033] Stepless regulation refers to any continuous regulation without steps within the capacity range. The opening refers to the degree of opening, which can be expressed as a percentage from 0% to 100%. An opening of 0% means the valve is closed, an opening of 50% means the valve is half open, and an opening of 100% means the valve is fully open.

[0034] The first evaporator refers to the equipment used to gasify the refrigerant in the internal environment test room, such as central circulation tube evaporator, external heating evaporator, etc.

[0035] In some embodiments, in combination Figure 1 As shown, one end of the first evaporator 113-m is connected to the first heat exchanger 112-m, and the first evaporator 113-m can exchange heat with the outside air, so that the liquid refrigerant entering the first evaporator 113-m from the first heat exchanger 112-m is converted into gaseous refrigerant; the other end of the first evaporator 113-m is connected to the first compressor 111-m, so that the gaseous refrigerant vaporized after passing through the first evaporator 113-m returns to the first compressor 111-m again, thereby realizing the recycling of the refrigerant.

[0036] In some embodiments, an electronic expansion valve is disposed at the front end of the inlet of the first evaporator connected to the first heat exchanger.

[0037] Electronic expansion valve is a valve used to adjust flow, throttle and reduce pressure, and control superheat. Electronic expansion valve can convert high-pressure or medium-pressure liquid refrigerant into low-pressure liquid refrigerant, while releasing heat to cool the refrigerant; it can also control the refrigerant flow entering the evaporator to ensure that the refrigerant flow adapts to the load changes of the evaporator.

[0038] In some embodiments, the opening of the electronic expansion valve is related to the superheat of the refrigerant at the outlet of the evaporator. The superheat refers to the difference between the actual gas temperature of the refrigerant at the outlet of the evaporator and the saturation temperature. The saturation temperature refers to the evaporation temperature of the refrigerant. A temperature sensor may be provided at the outlet of the evaporator to obtain the actual gas temperature, and the processor may determine the superheat based on the actual gas temperature and the saturation temperature.

[0039] A small superheat means that part of the refrigerant may not be completely evaporated, so the opening of the electronic expansion valve should be reduced to reduce the refrigerant entering the evaporator; a large superheat means that part of the refrigerant evaporates at the evaporator inlet, and there may be ice at the evaporator inlet, so the opening of the electronic expansion valve should be increased to increase the refrigerant entering the evaporator. Through the stepless adjustment of the opening of the electronic expansion valve, the refrigerant flow entering the evaporator can be steplessly adjusted to achieve stepless regulation of the refrigeration process.

[0040] During the refrigeration process, the first compressor inhales low-temperature and low-pressure liquid refrigerant from the intake pipe and compresses it. The low-temperature and low-pressure liquid refrigerant becomes high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant is sent into the first heat exchanger through the exhaust pipe of the first compressor and is cooled into medium-temperature and medium-pressure liquid refrigerant. This process releases a large amount of heat energy, which increases the temperature of the refrigerant (cooling water) of the first heat exchanger, that is, the heat energy is collected and used for heating; the medium-temperature and medium-pressure liquid refrigerant then passes through the electronic expansion valve provided at the front end of the inlet of the first evaporator and becomes low-temperature and low-pressure liquid refrigerant, enters the first evaporator, and is evaporated into low-temperature and low-pressure gaseous refrigerant. This process absorbs surrounding heat to achieve refrigeration; the low-temperature and low-pressure gaseous refrigerant enters the first compressor again to achieve a refrigeration cycle.

[0041] The internal environment test room is a test room used to simulate the indoor environment. For example, a test room that simulates the space where the indoor unit of an air conditioner is located.

[0042] The second machine group 120 refers to a combination of multiple machines used to control the external environment test room. Figure 1 As shown, the second unit 120 may be configured to regulate the operating conditions within a plurality of external environment test rooms (including external environment test rooms 140 - 1 , . . . , internal environment test rooms 140 - n ).

[0043] In some embodiments, Figure 1 As shown, the second unit 120 includes multiple parallel second compressors (such as the second compressor 121-1, ..., the second compressor 121-n), multiple second heat exchangers (such as the second heat exchanger 122-1, ..., the second heat exchanger 112-n) and multiple second evaporators (such as the second evaporator 123-1, ..., the second evaporator 123-n).

[0044] The second compressor refers to the equipment used to compress the refrigerant in the external environment test room.

[0045] The second heat exchanger refers to the equipment that exchanges heat with the external environment test room.

[0046] In some embodiments, in combination Figure 1 As shown, the exhaust pipe of the second compressor 121 - n may be connected to the second heat exchanger 122 - n.

[0047] In some embodiments, the second heat exchanger is further provided with a refrigerant inlet, and a second control valve is provided at the refrigerant inlet of the second heat exchanger.

[0048] The second control valve is a valve used to control the refrigerant to enter the second heat exchanger.

[0049] The second evaporator refers to the equipment used to vaporize the refrigerant in the external environment test room.

[0050] In some embodiments, in combination Figure 1 As shown, one end of the second evaporator 123-n is connected to the second heat exchanger 122-n, and the other end of the second evaporator 123-n is connected to the second compressor 121-n. An electronic expansion valve is provided at the front end of the inlet of the second evaporator connected to the second heat exchanger.

[0051] For more information about the second compressor, the second heat exchanger, the second control valve and the second evaporator, please refer to the first compressor, the first heat exchanger, the first control valve and the first evaporator respectively. The two corresponding devices have the same configuration and working principle, but the working locations are different. The equipment in the first unit acts on the internal environment test room, and the equipment in the second unit acts on the external environment test room.

[0052] The outdoor environment test room is a test room used to simulate the outdoor environment. For example, a test room that simulates the space where the air conditioner outdoor unit is located.

[0053] The processor 150 is a device for performing data processing and function execution in the energy-saving refrigeration system 100. The processor can process data and / or information obtained from the energy-saving refrigeration system 100. The processor can execute program instructions based on these data, information and / or processing results to perform one or more functions described in this application. In some embodiments, the processor may include one or more sub-processing devices (e.g., a single-core processing device or a multi-core multi-core processing device). As an example only, the processor may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), etc. or any combination thereof.

[0054] In some embodiments, the processor 150 is configured to: obtain current operating conditions and target operating conditions of multiple test rooms to be controlled; determine a first estimated thermal energy value of the first unit and a second estimated thermal energy value of the second unit based on the current operating conditions and the target operating conditions; determine a first control parameter of the first unit and a second control parameter of the second unit based on the current operating conditions, the target operating conditions, the first estimated thermal energy value and the second estimated thermal energy value.

[0055] In some embodiments, the processor 150 is further configured to determine a first refrigeration parameter and a second refrigeration parameter based on a current operating condition and a target operating condition.

[0056] In some embodiments, the processor 150 is further configured to: generate multiple candidate combination parameters based on the current operating condition, the target operating condition, the first estimated thermal energy value and the second estimated thermal energy value; for each candidate combination parameter, determine the estimated control time and estimated energy consumption value required to control multiple test rooms to be controlled from the current operating condition to the target operating condition according to the candidate combination parameter; determine the first control parameter and the second control parameter based on the estimated control time and estimated energy consumption value corresponding to the multiple candidate combination parameters.

[0057] In some embodiments, the processor 150 is further configured to: for each test room to be regulated, based on the regulation process and heating amount of the test room to be regulated, periodically determine the required refrigerant flow rate of the test room to be regulated at a preset interval; based on the required refrigerant flow rates of multiple test rooms to be regulated, determine the first regulation parameter and the second regulation parameter.

[0058] The energy-saving refrigeration system provided in some embodiments of the present specification can achieve stepless regulation of refrigeration by setting an electronic expansion valve, and can achieve stepless regulation of heating by setting a control valve, thereby improving the stability of regulating the working conditions in the test room; by setting a heat exchanger to recover the heat released by the compressor compressing the refrigerant and using it to heat the test room, it can save energy and reduce costs; through the corresponding settings of the unit and the test room, it is possible to achieve stable and adjustable working conditions in multiple test rooms at the same time.

[0059] In some embodiments, the processor can obtain the current operating conditions and target operating conditions of multiple test rooms to be controlled; based on the current operating conditions and the target operating conditions, determine the first estimated thermal energy value of the first unit and the second estimated thermal energy value of the second unit; based on the current operating conditions, the target operating conditions, the first estimated thermal energy value and the second estimated thermal energy value, determine the first control parameter of the first unit and the second control parameter of the second unit.

[0060] Figure 2 is an exemplary flow chart of an energy-saving refrigeration method according to some embodiments of this specification. Figure 2 As shown, the process 200 includes the following steps 210 to 230. In some embodiments, the process 200 may be executed by the processor 150.

[0061] Step 210, obtaining current operating conditions and target operating conditions of multiple test rooms to be regulated.

[0062] The test room to be regulated refers to a test room that needs to regulate the current working conditions. In some embodiments, the test room to be regulated may include an internal environment test room to be regulated and an external environment test room to be regulated.

[0063] The current working condition refers to the working condition of the test room to be regulated at the current moment. For example, the current working condition may include the current temperature and the current humidity. In some embodiments, the processor may obtain the current working condition through relevant sensor devices deployed in the test room to be regulated. For example, the current temperature is obtained through a temperature sensor, and the current humidity is obtained through a humidity sensor.

[0064] The target operating condition refers to the operating condition that the test room to be regulated needs to achieve. For example, the target operating condition may include a target temperature and a target humidity. In some embodiments, the target operating condition is a system default value or is manually preset.

[0065] Step 220, based on the current operating condition and the target operating condition, determine a first estimated thermal energy value of the first unit and a second estimated thermal energy value of the second unit.

[0066] The first estimated heat energy value refers to the estimated value of the heat energy generated by compression refrigeration when the first unit adjusts the multiple internal environment test rooms to be adjusted from the current operating conditions to the target operating conditions.

[0067] The second estimated thermal energy value refers to the estimated value of the thermal energy generated by compression refrigeration when the second unit adjusts the multiple external environment test rooms to be adjusted from the current operating conditions to the target operating conditions.

[0068] In some embodiments, for each test room to be regulated, the processor can determine the estimated thermal energy value corresponding to the test room to be regulated through cluster analysis, and then obtain the first estimated thermal energy value and the second estimated thermal energy value.

[0069] In some embodiments, the processor can construct multiple first clustering vectors based on the historical working conditions of multiple historical test rooms to be regulated at historical moments of working condition regulation and the corresponding historical target working conditions, and mark the actual heat energy value generated by the compression refrigeration of the historical test rooms to be regulated as the first label corresponding to the first clustering vector; construct a first target vector based on the current working condition and target working condition of the current test room to be regulated; cluster multiple first clustering vectors and first target vectors to obtain multiple first cluster clusters, and determine the first cluster cluster where the first target vector is located as the first target cluster cluster; calculate the mean of the first labels (actual heat energy values) corresponding to all first clustering vectors in the first target cluster cluster, and determine the mean as the estimated heat energy value corresponding to the current test room to be regulated. Among them, clustering methods include but are not limited to K-Means clustering algorithm, DBSCAN clustering algorithm, etc.

[0070] In some embodiments, the processor may determine the sum of the estimated thermal energy values ​​corresponding to all internal environment test rooms to be regulated as the first estimated thermal energy value, and determine the sum of the estimated thermal energy values ​​corresponding to all external environment test rooms to be regulated as the second estimated thermal energy value.

[0071] Step 230, based on the current operating condition, the target operating condition, the first estimated thermal energy value and the second estimated thermal energy value, determine the first control parameter of the first unit and the second control parameter of the second unit.

[0072] The first control parameter refers to a parameter related to the first unit controlling the internal environment test room to be controlled. In some embodiments, the first control parameter may include first heating parameters of a plurality of first heat exchangers.

[0073] The second control parameter refers to a parameter related to the control of the external environment test room to be controlled by the second unit. In some embodiments, the second control parameter may include second heating parameters of multiple second heat exchangers.

[0074] The first heating parameter refers to a parameter related to the first heat exchanger heating the internal environment test room to be regulated. In some embodiments, the first heating parameter may include the heating capacity of the first heat exchanger and the required refrigerant flow rate.

[0075] The second heating parameter refers to a parameter related to the second heat exchanger heating the external environment test room to be regulated. In some embodiments, the second heating parameter may include the heating capacity of the second heat exchanger and the required refrigerant flow rate.

[0076] The heating amount refers to the heat energy value that the heat exchanger needs to generate in order to heat the test room to be regulated from the current temperature to the target temperature. In some embodiments, the heating amount can be represented by the amount of gaseous refrigerant flowing from the compressor to the heat exchanger.

[0077] The required refrigerant flow rate refers to the refrigerant flow rate required by the heat exchanger to collect heat in order to heat the test room to be controlled from the current temperature to the target temperature. The heat collected by the heat exchanger refers to the heat absorbed by the refrigerant during the process of condensing the gaseous refrigerant in the heat exchanger.

[0078] In some embodiments, the processor can determine the first control parameter of the first unit and the second control parameter of the second unit in a variety of ways. For example, the processor can evenly distribute the first estimated thermal energy value to multiple first heat exchangers corresponding to multiple internal environment test rooms to be regulated to obtain the heating amount of multiple first heat exchangers; evenly distribute the second estimated thermal energy value to multiple second heat exchangers corresponding to multiple external environment test rooms to be regulated to obtain the heating amount of multiple second heat exchangers; the required refrigerant flow rate of each test room to be regulated can be the same system default value or manually preset value; in summary, the first heating parameter of the first heat exchanger and the second heating parameter of the second heat exchanger can be determined.

[0079] In some embodiments, the first control parameter may also include a first refrigeration parameter of the first compressor, and the second control parameter may also include a second refrigeration parameter of the second compressor. The processor may determine the first refrigeration parameter and the second refrigeration parameter based on the current operating conditions and the target operating conditions.

[0080] The first refrigeration parameter refers to a parameter related to the first compressor refrigerating the internal environment test room to be regulated. In some embodiments, the first refrigeration parameter may include the working mode and suction pressure of the first compressor.

[0081] The second refrigeration parameter refers to a parameter related to the second compressor refrigerating the external environment test room to be regulated. In some embodiments, the second refrigeration parameter may include the working mode and suction pressure of the second compressor.

[0082] The working mode refers to the way the compressor works during operation. For example, high temperature mode and low temperature mode. High temperature mode refers to the working mode of the compressor under high temperature conditions. Low temperature mode refers to the working mode of the compressor under low temperature conditions.

[0083] Suction pressure refers to the inlet pressure when the compressor sucks in refrigerant.

[0084] In some embodiments, the processor may determine the first refrigeration parameter and the second refrigeration parameter in a variety of ways based on the current operating condition and the target operating condition.

[0085] For example, the processor can construct multiple second clustering vectors based on historical data, wherein a second clustering vector is composed of the historical working conditions and corresponding historical target working conditions of multiple internal environment test rooms to be regulated at a historical moment in a historical working condition regulation performed at a historical moment, as well as the number of multiple internal environment test rooms to be regulated in history; a second target vector is constructed based on the current working conditions and target working conditions of multiple internal environment test rooms to be regulated at the current moment, as well as the number of multiple internal environment test rooms to be regulated at the current moment; multiple second clustering vectors are clustered to obtain multiple second clustering clusters; for each second clustering cluster, the minimum value of the actual refrigeration time corresponding to all second clustering vectors in the second clustering cluster is determined, and the historical actual first refrigeration parameter corresponding to the minimum actual refrigeration time is determined as the second label corresponding to all second clustering vectors in the second clustering cluster. Clustering methods include but are not limited to K-Means clustering algorithm, DBSCAN clustering algorithm, etc.

[0086] The processor may calculate multiple second similarities between the second target vector and the multiple second clustering vectors, and determine the second clustering vector with the largest second similarity, and determine the second label corresponding to the second clustering vector as the first cooling parameter. The second similarity may be represented by a vector distance, and the vector distance may include but is not limited to Euclidean distance, cosine distance, etc.

[0087] The method for determining the second refrigeration parameter is similar to the method for determining the first refrigeration parameter, and will not be described in detail here.

[0088] In some embodiments, the first refrigeration parameter may include a first refrigeration power, the second refrigeration parameter may include a second refrigeration power, and the processor may determine the first refrigeration power and the second refrigeration power based on the current operating condition, the target operating condition and the standard power threshold.

[0089] The first refrigeration power refers to the working power of the first compressor when compressing the refrigerant. The second refrigeration power refers to the working power of the second compressor when compressing the refrigerant.

[0090] The standard power threshold refers to the sum of the maximum refrigeration powers of all compressors, that is, the maximum value of the sum of the first refrigeration powers of all first compressors and the second refrigeration powers of all second compressors. In some embodiments, the standard power threshold can be set by those skilled in the art based on experience. For example, the standard power threshold can be positively correlated to the sum of the first estimated thermal energy value and the second estimated thermal energy value. The larger the sum of the first estimated thermal energy value and the second estimated thermal energy value, the more heat energy can be recovered in this operating condition regulation. The standard power threshold can be appropriately larger to increase the refrigeration power and shorten the regulation time.

[0091] In some embodiments, the processor can construct multiple third clustering vectors based on historical data, wherein a third clustering vector is composed of the historical working conditions of multiple historical test rooms to be regulated at a historical moment in a historical working condition regulation performed at a historical moment, the corresponding historical target working conditions, the historical standard power threshold, and the number of multiple historical test rooms to be regulated; construct a third target vector based on the current working conditions, target working conditions, standard power threshold of multiple test rooms to be regulated at the current moment, and the number of multiple test rooms to be regulated at the current moment; cluster the multiple third clustering vectors to obtain multiple third cluster clusters; for each third cluster cluster, determine the third cluster vectors whose sum of historical cooling powers in the cluster does not exceed the historical standard power threshold, select the third cluster vector with the shortest historical actual cooling time, and determine the historical actual cooling power corresponding to the third cluster vector (including the historical actual first cooling power and the historical actual second cooling power) as the third label corresponding to all third cluster vectors in the third cluster cluster. The clustering method includes but is not limited to the K-Means clustering algorithm, the DBSCAN clustering algorithm, etc.

[0092] The processor may calculate multiple third similarities between the third target vector and the multiple third clustering vectors, and determine the third clustering vector with the largest third similarity, and determine the third label corresponding to the third clustering vector as the first cooling power. The third similarity may be represented by a vector distance, and the vector distance may include but is not limited to a Euclidean distance, a cosine distance, and the like.

[0093] In some embodiments of the present specification, the total power of the compressor is limited by a standard power threshold, so that the refrigeration power determined based on the current operating condition, the target operating condition and the standard power threshold is more accurate, and the temperature in the test room can reach the target temperature faster, effectively shortening the control time and avoiding excessive energy consumption.

[0094] In some embodiments of the present specification, a first refrigeration parameter of the first compressor and a second refrigeration parameter of the second compressor can be accurately determined according to the current operating condition and the target operating condition, so that the compressor adopts different working modes under different operating conditions to ensure that the compressor can perform normal refrigeration under various operating conditions; the suction pressure of each compressor can be adjusted individually, and the refrigeration effect of each test room can be controlled individually, thereby meeting the refrigeration needs of multiple test rooms at the same time.

[0095] In some embodiments, the processor can generate multiple candidate combination parameters based on the current working condition, the target working condition, the first estimated thermal energy value and the second estimated thermal energy value; for each candidate combination parameter, determine the estimated control time and estimated energy consumption value required to control multiple test rooms to be controlled from the current working condition to the target working condition according to the candidate combination parameter; determine the first control parameter and the second control parameter based on the estimated control time and estimated energy consumption value corresponding to the multiple candidate combination parameters. For more information about this part, please refer to Figure 3 Related instructions.

[0096] In some embodiments, for each test room to be regulated, the processor can determine the required refrigerant flow rate of the test room to be regulated periodically at a preset interval based on the regulation process and heating amount of the test room to be regulated; and determine the first regulation parameter and the second regulation parameter based on the required refrigerant flow rates of multiple test rooms to be regulated. For more information about this part, please refer to Figure 4 Related instructions.

[0097] In some embodiments of the present specification, based on the current operating conditions and target operating conditions of the test room to be controlled, the estimated thermal energy value is determined to accurately determine the control parameters of the unit, and multiple test rooms to be controlled can be controlled simultaneously and independently, so that multiple test rooms to be controlled can reach the target operating conditions quickly and stably, and a stable and controllable heat source is provided for each test room through heat energy recovery to reduce energy consumption and ensure stable operation of the test room.

[0098] Figure 3 is an exemplary flow chart for determining the first control parameter and the second control parameter according to some embodiments of this specification. Figure 3 As shown, the process 300 includes the following steps 310 to 330. In some embodiments, the process 300 may be executed by the processor 150.

[0099] Step 310 , generating a plurality of candidate combination parameters based on the current operating condition, the target operating condition, the first estimated thermal energy value and the second estimated thermal energy value.

[0100] The candidate combination parameter refers to a combination of an alternative first control parameter and a second control parameter. In some embodiments, the candidate combination parameter may include a first candidate control parameter and a second candidate control parameter, the first candidate control parameter may include a first candidate refrigeration parameter and a first candidate heating parameter, and the second candidate control parameter may include a second candidate refrigeration parameter and a second candidate heating parameter. Among them, the first candidate refrigeration parameter may include a plurality of candidate operating modes, a candidate suction pressure, and a first candidate refrigeration power of the first compressor, the first candidate heating parameter may include a plurality of candidate heating amounts and a candidate required refrigerant flow of the first heat exchanger, the second candidate refrigeration parameter may include a plurality of candidate operating modes, a candidate suction pressure, and a second candidate refrigeration power of the second compressor, and the second candidate heating parameter may include a plurality of candidate heating amounts and a candidate required refrigerant flow of the second heat exchanger.

[0101] For example, candidate combination parameter 1 can be expressed as W1{[(C 11 )(H 11 )][(C 21 )(H 21 )]}. Among them, [(C 11 )(H 11 )] represents the first candidate control parameter 1, C 11 Indicates the first candidate cooling parameter 1, H 11 Indicates the first candidate heating parameter 1. [(C 21 )(H 21 )] represents the second candidate control parameter 1, C 21 Indicates the second candidate cooling parameter 1, H 21 Indicates the second candidate heating parameter 1.

[0102] Further, the first candidate cooling parameter 1 can be expressed as C 11 {[(M 111 )(F 111 )(P 111 )]…[(M 11m )(F 11m )(P 11m )]}. Among them, M 11m represents the candidate operating mode of the first compressor m in the first candidate refrigeration parameter 1, F 11m represents the candidate suction pressure of the first compressor 111-m in the first candidate refrigeration parameter 1, P 11m It represents the first candidate refrigeration power of the first compressor 111 - m in the first candidate refrigeration parameter 1 .

[0103] The first candidate heating parameter 1 can be expressed as H 11 {[(A 111 )(Q 111 )]…[(A 11m )(Q 11m )]}. Among them, A 11m represents the candidate heating capacity of the first heat exchanger 112-m in the first candidate heating parameter 1, Q 11m Represents the candidate required refrigerant flow rate of the first heat exchanger 112-m in the first candidate heating parameter 1.

[0104] The representation method of the second candidate cooling parameter 2 is similar to that of the first candidate cooling parameter 1 , and the representation method of the second candidate heating parameter 1 is similar to that of the second candidate heating parameter 1 , which will not be repeated here.

[0105] In some embodiments, the processor can generate multiple candidate combination parameters in a variety of ways based on the current operating conditions, the target operating conditions, the first estimated thermal energy value, and the second estimated thermal energy value. For example, the processor can randomly generate multiple first candidate control parameters and second candidate control parameters on the premise of meeting the first preset requirement, and randomly combine the multiple first candidate control parameters and the multiple second candidate control parameters to obtain multiple candidate combination parameters. Among them, the first preset requirement includes that all test rooms to be regulated can reach the target operating conditions, the sum of the candidate heating amounts of all first heat exchangers is not greater than the first estimated thermal energy value, and the sum of the candidate heating amounts of all second heat exchangers is not greater than the second estimated thermal energy value.

[0106] In some embodiments, the processor may generate a plurality of candidate combination parameters based on the current operating condition, the target operating condition, the first estimated thermal energy value, the second estimated thermal energy value, and the standard power threshold. For more information about the standard power threshold, see Figure 2 Related instructions.

[0107] In some embodiments, the processor may randomly generate a plurality of first candidate control parameters and a second candidate control parameter and randomly combine the plurality of first candidate control parameters and the plurality of second candidate control parameters to obtain a plurality of candidate combination parameters, provided that the second preset requirement is met. The second preset requirement includes the first preset requirement and the sum of all first candidate cooling powers and all second candidate cooling powers is not greater than the standard power threshold.

[0108] In some embodiments of the present specification, the candidate cooling powers are limited by a standard power threshold, so that the candidate control parameters conform to the actual situation and invalid candidate combination parameters are avoided.

[0109] Step 320, for each candidate combination parameter, determine the estimated control time and estimated energy consumption value required to control the multiple test rooms to be controlled from the current working condition to the target working condition according to the candidate combination parameter.

[0110] The estimated control time refers to the estimated time required to control all the test rooms to be controlled from the current working condition to the target working condition according to the candidate combination parameters.

[0111] The estimated energy consumption value refers to the estimated value of the energy consumed by adjusting all the test rooms to be adjusted from the current operating conditions to the target operating conditions according to the candidate combination parameters.

[0112] In some embodiments, the processor may determine the estimated control duration and the estimated energy consumption value in a variety of ways based on the candidate combination parameters, the current operating condition, and the target operating condition.

[0113] For example, the processor can construct multiple fourth clustering vectors based on historical data, and a fourth clustering vector is composed of the historical operating conditions and corresponding historical target operating conditions of multiple historical test rooms to be regulated at a historical moment in a historical operating condition regulation performed at a historical moment, as well as the actual first regulation parameters and the actual second regulation parameters.

[0114] For each candidate combination parameter, a fourth target vector is constructed based on the current operating conditions and target operating conditions of multiple test rooms to be controlled at the current moment, and the candidate combination parameter; multiple fourth clustering vectors and a fourth target vector corresponding to the candidate combination parameter are clustered to obtain multiple fourth clustering clusters; and the fourth clustering cluster where the fourth target vector is located is determined as the fourth target clustering cluster; the mean of the actual energy consumption values ​​corresponding to all fourth clustering vectors in the fourth target clustering cluster and the mean of the actual control duration are calculated, and the two are respectively determined as the estimated energy consumption value and the estimated control duration corresponding to the candidate combination parameter.

[0115] In some embodiments, the processor can determine the estimated control time and the estimated energy consumption value through an energy consumption prediction model based on the candidate combination parameters, the current operating conditions, the target operating conditions, the spatial volume of multiple test rooms to be controlled, and the internal debris volume of multiple test rooms to be controlled.

[0116] The space volume refers to the volume of air that can be contained inside the test room to be regulated. The internal debris volume refers to the total volume of objects placed in the test room to be regulated.

[0117] In some embodiments, the processor may collect spatial data of the test room to be controlled by means of a laser radar, and establish a three-dimensional model based on the spatial data, thereby obtaining the spatial volume and the volume of internal debris.

[0118] The energy consumption prediction model refers to a model used to determine the estimated control duration and the estimated energy consumption value. In some embodiments, the energy consumption prediction model can be a machine learning model. For example, a neural network (NN) model, a deep neural network (DNN) model, etc.

[0119] In some embodiments, the input of the energy consumption prediction model may include candidate combination parameters, current operating conditions, target operating conditions, space volume, and internal debris volume, and the output may be an estimated control time and an estimated energy consumption value. For more information about current operating conditions and target operating conditions, see Figure 2 And related instructions.

[0120] In some embodiments, the processor may train an energy consumption prediction model based on a plurality of training samples with training labels. The training samples may be obtained based on historical data. A training sample may include a historical operating condition regulation at a historical moment, a historical operating condition of a plurality of historical test rooms to be regulated at the historical moment, a historical target operating condition, a historical space volume, and a historical internal debris volume, and a corresponding historical combination parameter.

[0121] The historical combination parameter is composed of the historical first control parameter and the historical second control parameter of the historical working condition control. The training label corresponding to the training sample can be the historical actual control time and the historical actual energy consumption value of the historical working condition control. The training label can be manually labeled based on historical data.

[0122] In some embodiments, the processor may input the training samples into the initial energy consumption prediction model, construct a loss function based on the estimated control duration and the estimated energy consumption value output by the initial energy consumption prediction model and the training label, and update the initial energy consumption prediction model based on the loss function. When the preset conditions are met, the initial energy consumption prediction model training is completed to obtain a trained energy consumption prediction model. The preset conditions may be that the loss function converges, the number of iterations reaches a preset threshold, etc.

[0123] In some embodiments of the present specification, based on candidate combination parameters, current operating conditions, target operating conditions, spatial volume, and internal debris volume, an estimated control duration and an estimated energy consumption value are determined through an energy consumption prediction model, taking into full consideration that the spatial volume and internal debris volume of the test room to be controlled will have an impact on the control effect, and utilizing the learning ability of the machine learning model to make the results of the estimated control duration and the estimated energy consumption value more accurate, thereby facilitating the subsequent accurate determination of the control parameters.

[0124] Step 330: Determine a first control parameter and a second control parameter based on the estimated control durations and estimated energy consumption values ​​corresponding to the plurality of candidate combination parameters.

[0125] In some embodiments, for each candidate combination parameter, the processor can perform weighted summation on the estimated control time and the estimated energy consumption value corresponding to the candidate combination parameter; determine the first candidate control parameter among the candidate combination parameters corresponding to the smallest weighted sum result as the first control parameter, and determine the second candidate control parameter among the candidate combination parameters corresponding to the smallest weighted sum result as the second control parameter.

[0126] Among them, the weights corresponding to the estimated control duration and the estimated energy consumption value in the weighted sum can be determined by the processor based on the standard control duration and the standard energy consumption value. For example, the processor can determine the control duration difference between the estimated control duration and the standard control duration, and the energy consumption difference between the estimated energy consumption value and the standard energy consumption value. If the control duration difference is greater than the energy consumption difference, the weight of the estimated control duration is greater than the weight of the estimated energy consumption value; if the control duration difference is less than the energy consumption difference, the weight of the estimated control duration is less than the weight of the estimated energy consumption value. The standard control duration and the standard energy consumption value can be set by system default or manually based on experience.

[0127] In some embodiments of the present specification, a plurality of candidate combination parameters are generated, and the candidate combination parameters are evaluated based on the estimated control duration and the estimated energy consumption value to determine the control parameters, so as to find the optimal solution between reducing the control duration and reducing the energy consumption.

[0128] Figure 4 It is an exemplary schematic diagram of determining the first control parameter and the second control parameter according to some embodiments of this specification.

[0129] In some embodiments, the first regulation parameter may further include a first opening of the first control valve, and the second regulation parameter may further include a second opening of the second control valve.

[0130] The first opening degree refers to the opening degree of the first control valve. The second opening degree refers to the opening degree of the second control valve.

[0131] In some embodiments, the flow rate of the refrigerant entering the heat exchanger can be changed by changing the opening of the control valve. The larger the opening of the control valve, the greater the flow rate of the refrigerant entering the heat exchanger.

[0132] In some embodiments, Figure 4As shown, for each test room to be regulated (test room 410-1 to be regulated, test room 410-2 to be regulated, ..., test room 410-j to be regulated), the processor can periodically determine the required refrigerant flow rate (required refrigerant flow rate 440-1, required refrigerant flow rate 440-2, ..., required refrigerant flow rate 440-j) of the test room to be regulated at preset intervals based on the regulation process (regulation process 420-1, regulation process 420-2, ..., regulation process 420-j) and heating amount (heating amount 430-1, heating amount 430-2, ..., heating amount 430-j) of the test room to be regulated; determine the first regulation parameter 450 and the second regulation parameter 460 based on the required refrigerant flow rates of multiple test rooms to be regulated.

[0133] The control process refers to the stage of the current working condition control of the test room to be controlled. The control process can include the cooling stage and the heating stage.

[0134] In some embodiments, the processor determines the control process based on the current working condition of the test room to be controlled and the target working condition. For example, if the current temperature is higher than the target temperature, the control process is the cooling stage; if the current temperature is lower than the target temperature, the control process is the heating stage.

[0135] For more information on heating, see Figure 2 And related instructions.

[0136] In some embodiments, the preset interval may be set by system default or manually preset based on experience, for example, 30 seconds, 1 minute, etc.

[0137] The required refrigerant flow rate refers to the refrigerant flow rate required to make the heating rate of the test room to be regulated reach the standard heating rate.

[0138] The heating rate can be represented by the degree of temperature rise per unit time. The processor can collect the temperature of the test room to be regulated in real time through the temperature sensor, and determine the ratio of the temperature change degree to the time taken as the heating rate of the test room to be regulated. The standard heating rate can be preset manually.

[0139] In some embodiments, the processor may determine the required refrigerant flow rate based on the control process and the heating amount. For example, in response to the control process being the heating stage, the processor may continuously increase the refrigerant flow rate until the heating rate reaches the standard heating rate, so as to determine the required refrigerant flow rate corresponding to the standard heating rate; in response to the control process being the heating stage and the heating amount being greater than a preset heating amount threshold, the processor may increase the refrigerant flow rate according to a preset increment, until the heating rate reaches the standard heating rate, so as to determine the required refrigerant flow rate corresponding to the standard heating rate.

[0140] The preset heating amount threshold and the preset increment may be set by default by the processor or manually based on experience.

[0141] In some embodiments, the processor may periodically determine the required refrigerant flow rate at a preset interval. For each cycle, the processor may determine the opening of the control valve according to the required refrigerant flow rate of the test room to be regulated in the cycle. The opening of the control valve is positively correlated with the required refrigerant flow rate.

[0142] In some embodiments, the processor can determine the first heating parameter of the first heat exchanger and the second heating parameter of the second heat exchanger based on the current operating conditions, target operating conditions, first estimated thermal energy values ​​and second estimated thermal energy values ​​of multiple test rooms to be regulated; determine the first cooling parameter of the first compressor and the second cooling parameter of the second compressor based on the current operating conditions, target operating conditions and / or standard power thresholds; determine the first opening of the first control valve and the second opening of the second control valve based on the required refrigerant flow of multiple test rooms to be regulated; and obtain the first regulation parameter and the second regulation parameter through the above combination. For the determination process of the first heating parameter and the second heating parameter, as well as the determination process of the first cooling parameter and the second cooling parameter, please refer to Figure 2 and Figure 3 Related description.

[0143] In some embodiments, the processor can obtain the operating conditions of multiple test rooms to be stabilized at the time of monitoring; for each test room to be stabilized, in response to a fluctuation value of the operating conditions at the time of monitoring being greater than a preset fluctuation threshold, the heating amount of the test room to be stabilized is adjusted based on the operating conditions at the time of monitoring and the target operating conditions of the test room to be stabilized; based on the adjusted heating amount of the test room to be stabilized, the required refrigerant flow rate of the test room to be stabilized is determined.

[0144] The test room to be stabilized refers to a test room used to test whether the working conditions are stable after reaching the target working conditions.

[0145] The monitoring time refers to the time when the stabilization test room is monitored, which can be set by system default or manually based on experience. The working condition at the monitoring time refers to the working condition of the stabilization test room at the monitoring time. For the description and acquisition of working conditions, please refer to Figure 1 and Figure 2 Related instructions.

[0146] The fluctuation value of the operating condition at the monitoring time can be represented by the absolute value of the difference between the operating condition at the monitoring time and the target operating condition.

[0147] The preset fluctuation threshold refers to a threshold of a preset fluctuation value used to determine whether the heating amount of the test room to be stabilized needs to be adjusted. The preset fluctuation threshold may include at least one of a preset temperature fluctuation threshold and a preset humidity fluctuation threshold. The preset fluctuation threshold may be set by system default or manually based on experience. For example, the preset temperature fluctuation threshold may be 0.2°C.

[0148] In some embodiments, in response to the fluctuation value of the operating condition at the monitoring time being greater than a preset fluctuation threshold, the processor can calculate and determine the adjustment amount of heating required for the test room to be stabilized to reach the target operating condition from the operating condition at the monitoring time through a preset method (such as a thermal physics formula, etc.) to obtain the adjusted heating amount.

[0149] In some embodiments, the processor determines the required refrigerant flow rate of the test room to be stabilized based on the adjusted heating amount. Figure 2 The relevant contents of determining the required refrigerant flow rate of the test room to be regulated in step 230 are not described in detail here.

[0150] In some embodiments, the processor can continuously obtain the operating conditions of the test room to be stabilized at multiple monitoring times, and for each test room to be stabilized, continuously adjust the heating amount of the test room to be stabilized to continuously determine the required refrigerant flow rate of the test room to be stabilized.

[0151] In some embodiments of the present specification, after the test room to be stabilized reaches the target operating condition, the operating condition may fluctuate and deviate from the target operating condition. By real-time monitoring the operating condition of the test room to be stabilized and timely adjusting the heating amount of the test room to be stabilized when the operating condition fluctuates greatly, the operating condition of the test room to be stabilized can be stabilized at the target operating condition, thereby improving the stability of the operating condition.

[0152] In some embodiments of the present specification, when the control process reaches the heating stage, the opening of the control valve is gradually increased to increase the required refrigerant flow rate of the test room to be controlled until the heating rate reaches the standard heating rate, so that the operating condition of the test room to be controlled can stably and quickly reach the target condition.

[0153] Figure 5 It is a schematic diagram of the structure of an energy-saving refrigeration device according to some embodiments of the present specification.

[0154] In some embodiments, Figure 5As shown, the energy-saving refrigeration device includes multiple units, each unit includes multiple compressors running in parallel, and the compressor is configured to be mechanically connected to the heat recovery heat exchanger, the evaporator, and the condenser through multiple pipelines; the multiple pipelines include a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline, and the multiple pipelines are mechanically connected; the first pipeline is equipped with a first pressure regulating valve, a second pressure regulating valve, a temperature regulating valve, and a pressure difference regulating valve; the second pipeline is equipped with a first automatic ball valve and a third automatic ball valve; the third pipeline is equipped with a second automatic ball valve; the fourth pipeline is equipped with a fourth automatic ball valve; the first pressure regulating valve is configured to control the refrigerant pressure in the evaporator; the second pressure regulating valve is configured to control the suction pressure of the compressor; the temperature control valve is configured to control the compressor Intake temperature; the first automatic ball valve, the second automatic ball valve, the third automatic ball valve and the fourth automatic ball valve are configured to control the flow direction of the refrigerant; the evaporator includes one or more indoor evaporators and one or more outdoor evaporators; the indoor evaporator is configured with a high-temperature expansion valve; the outdoor evaporator is configured with a high-temperature expansion valve; the high-temperature expansion valve and the high-temperature expansion valve are configured to control the refrigerant flow entering the evaporator; the heat recovery heat exchanger includes an indoor heat exchanger and an outdoor heat exchanger, the indoor heat exchanger is configured with a first heat exchange valve, and the outdoor heat exchanger is configured with a second heat exchange valve; the first heat exchange valve and the second heat exchange valve are configured to change the refrigerant flow entering the heat recovery heat exchanger by controlling the valve opening; the condenser is configured with a water flow regulating valve, and the water flow regulating valve is configured to adjust the refrigerant flow.

[0155] In some embodiments, the plurality of units may be configured to cool a plurality of independent rooms simultaneously, and the plurality of independent spaces may include at least one indoor room and at least one outdoor room. The indoor room and the outdoor room may be the internal environment test room and the external environment test room, respectively.

[0156] At present, most refrigeration systems have independent configurations for indoor and outdoor rooms, and are configured according to the maximum load of each room. However, in actual use, the maximum cooling load will not be reached at the same time on both sides. In some embodiments of this specification, a parallel refrigeration station is used to meet the cooling demand for multiple rooms at the same time, so that the configuration of the compressor only considers the maximum cooling load on one side, so as to reduce the initial investment and power distribution capacity of the refrigeration machine part, and minimize the increase in energy consumption caused by too many compressors being turned on.

[0157] In some embodiments, the first pressure regulating valve may be configured to operate the evaporator at a high dew point by controlling the refrigerant pressure in the evaporator, ie, the evaporation pressure of the evaporator. The evaporation temperature control range of the evaporator may be -40 to 15°C.

[0158] At present, the evaporation pressure of most refrigerators is uncontrollable, resulting in an uncontrollable relationship between the evaporation temperature and the dew point. Under high temperature and low humidity conditions, the evaporation pressure of the refrigerator is too high to meet the dehumidification requirements, so that the humidity in the room cannot be reduced to the specified range; under high temperature and high humidity conditions, the refrigerator operates in a low dew point state, resulting in the sensible heat ratio of the evaporator being too small and the dehumidification capacity being too large. A large amount of electric humidification is required to make up for the redundant dehumidification of the system, which makes the laboratory operation energy consumption too high. In some embodiments of the present specification, the evaporation pressure of the evaporator is controlled by a first pressure regulating valve, so that the evaporator is always operated in a high dew point state to reduce the redundant dehumidification of the evaporator. And by setting a heat recovery heat exchanger to recover the heat released by the compressor compressing the refrigerant, when the corresponding energy is invested in the room for dehumidification, heat recovery can be used to make up for the corresponding sensible cooling, so as to achieve cooling and heating in the same room at the same time.

[0159] In some embodiments, the second pressure regulating valve can be configured to control the saturation temperature corresponding to the suction pressure of the compressor to be less than or equal to a preset temperature threshold; the temperature regulating valve can be configured to adjust the amount of liquid refrigerant injected into the suction port of the compressor to control the suction temperature of the compressor.

[0160] The maximum suction pressure allowed by the currently commonly used piston compressor does not exceed 7.1 bar, that is, the evaporation temperature of the corresponding R404a refrigerant is 5° C. Therefore, the preset temperature threshold is preferably 5° C.

[0161] When the evaporator operates at an evaporating temperature above 5°C, the second pressure regulating valve will change its valve opening to ensure that the saturation temperature corresponding to the compressor suction pressure flowing through the second pressure regulating valve does not exceed 5°C, thereby preventing the compressor from overloading due to high suction pressure.

[0162] In addition, hot gas bypass will cause the compressor suction temperature to rise, which may easily lead to excessive compressor exhaust temperature. In severe cases, it will cause carbonization of the refrigeration oil and the compressor is at risk of serious damage. Therefore, a temperature regulating valve is set to control the compressor suction overheating by adjusting the amount of liquid refrigerant sprayed into the compressor suction port. That is, the cooperation of the second pressure regulating valve and the temperature control valve can keep the compressor running within a reasonable operating range.

[0163] In some embodiments, the high-temperature expansion valve and the high-low-temperature expansion valve may refer to a high-temperature electronic expansion valve and a high-low-temperature electronic expansion valve, respectively. The electronic expansion valve may be configured to receive the room operating condition cold end and the evaporator outlet overheat control, and the opening of the two is calculated as the smaller, to ensure that the evaporator outlet is steplessly regulated under the premise of overheating, and the refrigerant flow entering the evaporator is steplessly regulated to ensure that the refrigerant flow adapts to the load change of the evaporator. The cold capacity adjustment range of the electronic expansion valve is 0% to 100% of the evaporator capacity. That is, the adjustment range is large, and the parallel design of the system can realize automatic loading and unloading of the chiller by monitoring the actual cold load at the end.

[0164] In some embodiments, the operating mode of the energy-saving refrigeration device may include a high temperature operating mode and / or a low temperature operating mode.

[0165] Combination Figure 5 As shown, in the high temperature working mode, one or two of the multiple compressors are put into operation, the first pressure regulating valve controls the valve front pressure of the second pressure regulating valve, the second pressure regulating valve and the temperature control valve respectively control the suction pressure and suction superheat of the compressor; the high temperature expansion valve and the high and low temperature expansion valve respectively control the refrigerant flow entering the evaporator. During the operation, the first automatic ball valve and the second automatic ball valve are in the open state, and the third automatic ball valve is in the closed state, so that the refrigerant gas after being processed by the second pressure regulating valve and the temperature regulating valve is sucked into the compressor, compressed, and condensed to complete the refrigeration cycle.

[0166] Combination Figure 5 As shown, in the low-temperature working mode, multiple compressors are put into operation, the first pressure regulating valve controls the pressure before the second pressure regulating valve, the second pressure regulating valve and the temperature control valve respectively control the suction pressure and suction superheat of the compressor; the high-temperature expansion valve and the high-low temperature expansion valve respectively control the refrigerant flow entering the evaporator. During operation, the first automatic ball valve and the second automatic ball valve are in a closed state, and the third automatic ball valve is in an open state. The refrigerant evaporated in the high-temperature evaporator is treated by the second pressure regulating valve and the temperature regulating valve. The refrigerant gas is sucked in, compressed, and condensed by the upper compressor to complete the refrigeration cycle; the refrigerant evaporated in the low-temperature evaporator is directly sucked in, compressed, and condensed by the lower compressor through the third automatic ball valve to complete the refrigeration cycle.

[0167] In some embodiments of the present specification, the switching of high and low temperature working modes prevents the cooling station from reducing the refrigeration performance coefficient of the overall operation of the cooling station due to the low temperature on one side, thereby improving the operating energy efficiency of the system.

[0168] In some embodiments, the water flow regulating valve can be configured to regulate the refrigerant flow to control the compressor condensing pressure.

[0169] The compressor arranges the pipeline to branch out the inner and outer heat recovery pipelines, and a heat exchange valve is installed at the inlet of each heat recovery heat exchanger. The processor can control the valve opening of the heat exchange valve through a 4-20mA signal to change the refrigerant flow entering the heat recovery heat exchanger, thereby changing the heating amount. The first heat exchange valve and the second heat exchange valve are valves used to control the refrigerant entering the indoor heat exchanger and the outdoor heat exchanger, respectively. For example, electromagnetic control valves, electromagnetic hydraulic control valves, etc.

[0170] In order to avoid the heat exchange valve from being out of adjustment, a pressure difference control combination valve is installed on the main pipe. The pressure difference control combination valve can continuously control the pressure difference at both ends of the main pipe during heat recovery operation, so that the regulation of the heat exchange valve is in an effective state.

[0171] In addition, the exhaust temperature of the compressor is high but the energy is low, so the exhaust gas from the compressor can only generate a large amount of heat when it condenses in the heat recovery heat exchanger. Therefore, a water flow control valve is set on the water side of the condenser. By controlling the valve opening of the water flow control valve, the refrigerant flow is adjusted to control the compressor condensing pressure and improve the condensing effect of heat recovery.

[0172] The heat recovery heat exchanger is the same as the above heat exchanger, the indoor heat exchanger and the outdoor heat exchanger are the same as the above first heat exchanger and the second heat exchanger, respectively, and the indoor evaporator and the outdoor evaporator are the same as the above first evaporator and the second evaporator, respectively.

[0173] Some embodiments of the present specification provide a computer-readable storage medium, which stores computer instructions. When a computer reads the computer instructions in the storage medium, the computer executes the energy-saving refrigeration method as described above.

[0174] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to this specification. Such modifications, improvements and corrections are suggested in this specification, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of this specification.

[0175] At the same time, this specification uses specific words to describe the embodiments of this specification. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of this specification. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of this specification can be appropriately combined.

[0176] In addition, unless explicitly stated in the claims, the order of the processing elements and sequences described in this specification, the use of alphanumeric characters, or the use of other names are not intended to limit the order of the processes and methods of this specification. Although the above disclosure discusses some invention embodiments that are currently considered useful through various examples, it should be understood that such details are only for illustrative purposes, and the attached claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of this specification. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0177] Similarly, it should be noted that in order to simplify the description disclosed in this specification and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this specification, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the subject matter of this specification are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0178] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of this specification are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0179] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this specification are hereby incorporated by reference in their entirety. Except for application history documents that are inconsistent with or conflicting with the contents of this specification, documents that limit the broadest scope of the claims of this specification (currently or later attached to this specification) are also excluded. It should be noted that if the descriptions, definitions, and / or use of terms in the materials attached to this specification are inconsistent or conflicting with the contents described in this specification, the descriptions, definitions, and / or use of terms in this specification shall prevail.

[0180] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, as an example and not a limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly introduced and described in this specification.

Claims

1. An energy-saving refrigeration system, characterized in that: The system includes a first unit, a second unit, a plurality of internal environment test rooms, a plurality of external environment test rooms and a processor; The first unit includes a plurality of first compressors, a plurality of first heat exchangers and a plurality of first evaporators connected in parallel, the exhaust pipe of the first compressor is connected to the first heat exchanger, one end of the first evaporator is connected to the first heat exchanger, the other end of the first evaporator is connected to the first compressor, and an electronic expansion valve is arranged at the front end of the inlet of the first evaporator connected to the first heat exchanger; the first unit is configured to regulate the working conditions in the plurality of internal environment test rooms; The second unit includes a plurality of second compressors, a plurality of second heat exchangers and a plurality of second evaporators connected in parallel, the exhaust pipe of the second compressor is connected to the second heat exchanger, one end of the second evaporator is connected to the second heat exchanger, the other end of the second evaporator is connected to the second compressor, and the electronic expansion valve is arranged at the front end of the inlet of the second evaporator connected to the second heat exchanger; the second unit is configured to regulate the working conditions in the plurality of external environment test rooms; The processor is configured to: Obtain current working conditions and target working conditions of multiple test rooms to be regulated; Determining a first estimated thermal energy value of the first unit and a second estimated thermal energy value of the second unit based on the current operating condition and the target operating condition; Based on the current operating condition, the target operating condition, the first estimated thermal energy value and the second estimated thermal energy value, the first control parameter of the first unit and the second control parameter of the second unit are determined, the first control parameter includes the first heating parameter of the first heat exchanger, and the second control parameter includes the second heating parameter of the second heat exchanger.

2. The system according to claim 1, characterized in that The first regulating parameter further includes a first refrigeration parameter of the first compressor, the second regulating parameter further includes a second refrigeration parameter of the second compressor, and the processor is further configured to: Based on the current operating condition and the target operating condition, the first refrigeration parameter and the second refrigeration parameter are determined.

3. The system according to claim 2, characterized in that The processor is further configured to: generating a plurality of candidate combination parameters based on the current operating condition, the target operating condition, the first estimated thermal energy value, and the second estimated thermal energy value; For each candidate combination parameter, determine the estimated control time and the estimated energy consumption value required to control the multiple test rooms to be controlled from the current working condition to the target working condition according to the candidate combination parameter; The first control parameter and the second control parameter are determined based on the estimated control durations and the estimated energy consumption values ​​corresponding to the multiple candidate combination parameters.

4. The system according to claim 1, characterized in that A first control valve is provided at a refrigerant inlet of the first heat exchanger, and a second control valve is provided at a refrigerant inlet of the second heat exchanger. The first control parameter further includes a first opening of the first control valve, and the second control parameter further includes a second opening of the second control valve. The processor is further configured as follows: For each test room to be regulated, based on the regulation process and heating amount of the test room to be regulated, periodically determine the required refrigerant flow rate of the test room to be regulated at preset intervals; The first control parameter and the second control parameter are determined based on the required refrigerant flow rates of the multiple test rooms to be controlled.

5. An energy-saving refrigeration method, characterized in that: The method is executed by a processor, comprising: Obtain current working conditions and target working conditions of multiple test rooms to be regulated; Based on the current operating condition and the target operating condition, determining a first estimated thermal energy value of the first unit and a second estimated thermal energy value of the second unit; Based on the current operating condition, the target operating condition, the first estimated thermal energy value and the second estimated thermal energy value, determine the first control parameter of the first unit and the second control parameter of the second unit, the first control parameter includes the first heating parameter of the first heat exchanger, and the second control parameter includes the second heating parameter of the second heat exchanger.

6. The method according to claim 5, characterized in that The first regulating parameter further includes a first refrigeration parameter of a first compressor, the second regulating parameter further includes a second refrigeration parameter of a second compressor, and the method further includes: Based on the current operating condition and the target operating condition, the first refrigeration parameter and the second refrigeration parameter are determined.

7. The method according to claim 6, characterized in that The method further comprises: generating a plurality of candidate combination parameters based on the current operating condition, the target operating condition, the first estimated thermal energy value, and the second estimated thermal energy value; For each candidate combination parameter, determine the estimated control time and the estimated energy consumption value required to control the multiple test rooms to be controlled from the current working condition to the target working condition according to the candidate combination parameter; The first control parameter and the second control parameter are determined based on the estimated control durations and the estimated energy consumption values ​​corresponding to the multiple candidate combination parameters.

8. The method according to claim 5, characterized in that The first regulating parameter further includes a first opening of the first control valve, the second regulating parameter further includes a second opening of the second control valve, and the method further includes: For each test room to be regulated, based on the regulation process and heating amount of the test room to be regulated, periodically determine the required refrigerant flow rate of the test room to be regulated at preset intervals; The first control parameter and the second control parameter are determined based on the required refrigerant flow rates of the multiple test rooms to be controlled.

9. An energy-saving refrigeration device, characterized in that: The device includes a plurality of units, each unit includes a plurality of compressors running in parallel, the compressors are configured to be mechanically connected to a heat recovery heat exchanger, an evaporator, and a condenser through a plurality of pipelines; the plurality of pipelines include a first pipeline, a second pipeline, a third pipeline, and a fourth pipeline, and the plurality of pipelines are mechanically connected to each other; The first pipeline is equipped with a first pressure regulating valve, a second pressure regulating valve, a temperature regulating valve, and a differential pressure regulating valve; the second pipeline is equipped with a first automatic ball valve and a third automatic ball valve; the third pipeline is equipped with a second automatic ball valve; the fourth pipeline is equipped with a fourth automatic ball valve; The first pressure regulating valve is configured to control the refrigerant pressure in the evaporator; the second pressure regulating valve is configured to control the suction pressure of the compressor; the temperature control valve is configured to control the suction temperature of the compressor; the first automatic ball valve, the second automatic ball valve, the third automatic ball valve and the fourth automatic ball valve are configured to control the refrigerant flow direction; The evaporator includes one or more indoor evaporators and one or more outdoor evaporators; the indoor evaporator is equipped with a high-temperature expansion valve; the outdoor evaporator is equipped with a high-low temperature expansion valve; the high-temperature expansion valve and the high-low temperature expansion valve are configured to control the refrigerant flow entering the evaporator; The heat recovery heat exchanger includes an indoor heat exchanger and an outdoor heat exchanger, the indoor heat exchanger is provided with a first heat exchange valve, and the outdoor heat exchanger is provided with a second heat exchange valve; the first heat exchange valve and the second heat exchange valve are configured to change the refrigerant flow entering the heat recovery heat exchanger by controlling the valve opening; The condenser is equipped with a water flow regulating valve, and the water flow regulating valve is configured to regulate the flow of refrigerant.

10. A computer-readable storage medium, wherein the storage medium stores computer instructions. When a computer reads the computer instructions in the storage medium, the computer executes the energy-saving refrigeration method according to any one of claims 5 to 8.

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