A method for analyzing energy-saving operation scheme of refrigeration system

Abstract

The present invention discloses a method for analyzing energy-saving operation schemes of a refrigeration system, comprising: collecting multiple environmental parameter information of refrigeration equipment; judging the change of cold room load according to the cold room temperature change information and the compressor suction pressure change information, and analyzing whether its load change is similar to the historical record data of the refrigeration system, and jointly controlling the equipment of the entire refrigeration system according to the judgment result. This method ensures that each device in the refrigeration system can respond to the change of cold room load in the best state, so that the energy consumption of the refrigeration system is reduced, the operating cost is reduced, the number of system equipment starts and stops is reduced, and the equipment life is increased. At the same time, the control module used in this method will compare the collected data with the pre-set value. For parameters with abnormal values, the control module will send a fault alarm signal to the control room or cloud platform to notify the staff to handle the fault and manually close the alarm to ensure the safe operation of the refrigeration system equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of self-regulating mechanisms, and in particular to a method for analyzing energy-saving operation schemes of refrigeration systems. Background Art

[0002] During the operation of the refrigeration system, each refrigeration equipment is often operated and controlled separately, resulting in the inability of each equipment to adjust and respond in time when the required load changes. It still runs for a long time according to the original setting state, wasting energy and increasing the operating cost of the refrigeration system. At present, there is a lack of effective coordinated control methods for refrigeration systems in the field of large-scale refrigeration system control, and there is currently a lack of a method to quickly control refrigeration system equipment through historical control records, that is, the changes in the load of the cold room caused by the goods entering and leaving the cold room or the operation process. Even if some refrigeration systems use a coordinated control system, there is no method to adjust the system based on historical records, and even the equipment operating parameters cannot be transmitted back to the monitoring platform, which also has certain obstacles to the centralized management of the refrigeration system. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention discloses a method for analyzing energy-saving operation schemes of a refrigeration system, which specifically comprises the following steps:

[0004] Collect multiple environmental parameter information of refrigeration equipment;

[0005] The cold room load change is determined based on the cold room temperature change information and the compressor suction pressure change information, and its load change is analyzed to see if it is similar to the historical record data of the refrigeration system. Based on the judgment result, the equipment of the entire refrigeration system is jointly controlled.

[0006] Furthermore, when judging the change of cold room load according to the cold room temperature change information:

[0007] If the cooling room load increases, the refrigeration system sends a signal to the air cooler to continue the control process of increasing the cooling load of a single room;

[0008] If the cooling room load is reduced, the control module of the refrigeration system sends a signal to the air cooler to continue to execute the control process of reducing the cooling load of the single room.

[0009] Furthermore, when analyzing whether the change in cold room load is similar to the historical record data of the refrigeration system, the collected data is compared with the data parameters set when the refrigeration system is operating normally:

[0010] If the collected data is within the set normal operating parameter range, the time parameter value is recorded, a record log is generated, and the operating parameters are transmitted to the refrigeration room or monitoring cloud platform;

[0011] If the collected data is not within the set normal operating parameter range, an audible and visual alarm signal will be sent to the refrigeration room or monitoring cloud platform according to the parameter abnormality, and a record log will be generated. The control will end after the alarm is manually closed and the system fault is checked.

[0012] Furthermore, when judging the change of the cold room load, the air cooler control process is entered, including the following steps:

[0013] If the load increases, it is determined whether the cooling fan in operation is running at full load, where full load means that all fans of a single cooling fan are turned on and run at power frequency;

[0014] If it is running at full load, determine whether the full load operation of a single air cooler meets the requirements;

[0015] If not, one of the running air coolers will maintain the power frequency operation, and a new idle air cooler will be started;

[0016] Determine whether the full load operation of a single air cooler meets the requirements:

[0017] If yes, the single cooling fan in operation is switched to full load operation;

[0018] If not, the single cooling fan in operation is switched to full load operation, and a new idle cooling fan is turned on;

[0019] After the air cooler control process is completed, it is determined whether the cooling capacity of the existing air cooler meets the load change requirements:

[0020] If yes, record each control parameter and control process and generate a record log, which is stored in the memory;

[0021] If not, return to the start step of the air cooler control process, and circulate the control process until the air cooler control meets the load change requirements.

[0022] Further, after determining whether the cold room load change is increasing or decreasing, the air cooler control process is entered, including the following steps:

[0023] If the load decreases, first determine whether any of the cooling fans in operation are running at full load;

[0024] If so, determine whether the single air cooler can meet the requirement by shutting down one fan;

[0025] If not, shut down an idle cooling fan in operation;

[0026] After determining whether the single air cooler can meet the requirements by shutting down one fan,

[0027] If so, the single cooling fan in operation will shut down one of the fans;

[0028] If not, two or more fans of a single cooling fan in operation are turned off;

[0029] After the air cooler control process is completed, it is determined whether the cooling capacity of the existing air cooler meets the load change requirements;

[0030] If so, record each control parameter and control process and generate and store a record log;

[0031] If not, return to the initial step and circulate the control process until the air cooler control meets the load change requirements.

[0032] Furthermore, after the air cooler control process is completed, the compressor and evaporative condenser control process is entered.

[0033] Furthermore, the compressor control process is as follows:

[0034] Determine the change of the inhalation pressure based on the collected inhalation pressure:

[0035] If the suction pressure increases, it means that the load at the end of the system increases, one of the compressors in operation is running at full load, and the variable frequency compressor is opened at the K% energy level;

[0036] Determine whether the compressor control meets the load change requirements:

[0037] If so, the control ends;

[0038] If not, one of the running compressors is running at full load, and the variable frequency compressor should be opened to the K+25% energy level;

[0039] Until the energy level of the variable frequency compressor reaches 100%. If it is still not enough, another compressor will be opened to run at full load, and the variable frequency compressor will be reduced to K% energy level. This cycle will continue until the control meets the load change requirements.

[0040] Furthermore, the compressor control process also includes:

[0041] Determine the change of the inhalation pressure based on the collected inhalation pressure:

[0042] If the suction pressure decreases, it means that the terminal load of the refrigeration system decreases, then one of the compressors in operation will be stopped and the variable frequency compressor will be opened at M% energy level;

[0043] Determine whether the compressor control meets the load change requirements:

[0044] If so, the control ends;

[0045] If not, the inverter compressor will operate at a 25% lower energy level;

[0046] Until the energy level of the variable frequency compressor reaches 0%, it is shut down. If it is still not satisfied, another compressor is shut down and the variable frequency compressor is reduced to the M% energy level. This cycle is repeated until the control meets the load change requirements.

[0047] Furthermore, the control process of the evaporative condenser is as follows:

[0048] Determine the exhaust pressure change according to the collected exhaust pressure;

[0049] If the exhaust pressure increases, it means that the condensing load increases; turn on an idle condenser and reduce the frequency of the condenser fan;

[0050] Determine whether the control complies with the load change;

[0051] If so, the control ends;

[0052] If not, return to the starting step of the evaporative condenser control process, and circulate the control process until the evaporative condenser control meets the load change requirements;

[0053] If the exhaust pressure decreases, it means that the condensing load is reduced, and it is judged whether the condenser fan frequency conversion meets the requirements;

[0054] If so, the condenser fan will run at reduced frequency;

[0055] If not, the condenser fan is off;

[0056] After all the above steps are completed, determine whether the control meets the load change requirements;

[0057] If so, the control ends;

[0058] If not, return to the initial step and loop the control process until the evaporative condenser control meets the load change requirements.

[0059] Further, according to the single cold room load control process, load control is performed on multiple cold rooms, including the steps of:

[0060] When judging whether the cold room is changing in multiple rooms according to the change of warehouse temperature, it is further judged whether the change of cold room load is increasing or decreasing;

[0061] If the load increases, the single-room cooling system load increase control process logic is used and multiple rooms are implemented simultaneously;

[0062] Determine whether the temperature changes in all cold rooms meet the requirements;

[0063] If so, the control ends;

[0064] If not, return to the starting step of load control of multiple cold rooms, and circulate the control process until the control of multiple cold rooms all meet the load change requirements;

[0065] According to the single cold room load control process, load control is performed on multiple cold rooms, including:

[0066] When judging whether the cold room is changing in multiple rooms according to the change of warehouse temperature, it is further judged whether the change of cold room load is increasing or decreasing;

[0067] If the load is reduced, the single-room cooling system load reduction control process logic is used and multiple rooms are implemented simultaneously;

[0068] Determine whether the temperature changes in all cold rooms meet the requirements;

[0069] If so, the control ends;

[0070] If not, return to the starting step of load control of multiple cold rooms, and circulate the control process until the control of multiple cold rooms all meets the load change requirements.

[0071] Due to the adoption of the above technical solution, the present invention provides a method for analyzing energy-saving operation solutions for refrigeration systems. This method ensures that each device in the refrigeration system can respond to changes in cold room loads in the best state, thereby reducing the energy consumption of the refrigeration system, reducing operating costs, reducing the number of system equipment starts and stops, and increasing equipment life. At the same time, the control module used in this method will compare the collected data with the pre-set values. For parameters with abnormal values, the control module will send a fault alarm signal to the control room or cloud platform to notify the staff to handle the fault and manually close the alarm to ensure the safe operation of the refrigeration system equipment.

[0072] The technical solution of the present invention solves the problem that each device in the prior art is controlled separately and the devices run at a fixed frequency for a long time, and the refrigeration system equipment responds slowly to changes in the cold room load. By adopting a more reasonable control method, the start and stop times of the equipment (such as compressors, evaporative condensers, air coolers, etc.) are greatly reduced, thereby reducing the energy consumption of the system operation and increasing the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0074] Figure 1 The overall control flow chart of the method of the present invention is

[0075] Figure 2 The historical record control flow chart of the method of the present invention is

[0076] Figure 3 The fault alarm control flow chart of the method of the present invention is

[0077] Figure 4 The multi-cold room control flow chart of the method of the present invention

[0078] Figure 5 The single cold room control flow chart of the method of the present invention is

[0079] Figure 6 The single evaporative cooling control flow chart of the method of the present invention is

[0080] Figure 7 The control flow chart of a single compressor unit of the method of the present invention is as follows DETAILED DESCRIPTION

[0081] In order to make the technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention:

[0082] like Figure 1 The overall control flow of a method for analyzing energy-saving operation schemes of a refrigeration system shown in the figure first collects multiple operating parameters and environmental parameters of the refrigeration equipment, including compressor suction pressure (pz), exhaust pressure (p), exhaust temperature (T), outdoor wet-bulb temperature (tw) of the evaporative condenser, fan motor operating frequency (fz) of the evaporative condenser, fan motor operating power (Pz) of the evaporative condenser, operating power of the circulating water pump (Pzb), storage temperature (t), storage temperature change (Δt) and air cooler operating power (Pl). In addition, the relevant personnel input the range of allowable changes of each collected parameter of the refrigeration equipment during normal operation of the system according to the refrigeration process requirements. When the collected data is uploaded to the control module, the control module will determine whether the load change of the refrigeration system is similar to that in the system history records based on the relevant parameters.

[0083] At the same time, the control module will determine whether the refrigeration system has abnormal operation by checking whether the operating parameters of the refrigeration equipment exceed the allowable range of variation. If an abnormality occurs, it will send an audible and visual alarm signal to alert the relevant operators to solve the problem in time to avoid losses to the refrigeration equipment and production. When the control module determines that the collected refrigeration equipment parameters are similar to the system historical records, the control module will directly send the control signal of the system in the historical records to each refrigeration equipment, and the refrigeration equipment will respond quickly and quickly adjust the temperature to meet production requirements. At this time, the time spent on sequential adjustment of each device and each subsystem is saved, and the device responds quickly to changes in system load, reducing the operating time of each device during adjustment, thereby saving energy consumption; when the control module determines that the collected refrigeration equipment parameters are not similar to the system historical records, it will determine whether the cold room load is increasing or decreasing based on the changes in the cold room temperature, the compressor suction and exhaust pressure changes, and determine whether it will jointly control the equipment of the entire refrigeration system based on the judgment result, that is, first carry out the single cold room control process, which includes the operation control of the air cooler equipment, and then carry out the multi-cold room control process. After the cold room control process is completed, the compressor unit and evaporative cooling control process will be carried out; after the control module ensures that the operating status of each device in the refrigeration system changes under control, it will collect the above-mentioned operating data again and determine whether the cold room temperature change meets the production requirements. The control process ends when the production requirements are met. The above-mentioned control process will be stored in the control module as a historical operation data for subsequent rapid control and adjustment of each refrigeration equipment. The following will be about Figure 1 The overall control process describes each sub-item control module in detail.

[0084] like Figure 2 The historical record control process of a refrigeration system energy-saving operation scheme analysis method shown in the figure, this step first collects the change in the cold room temperature (Δt) and compares it with the allowable change range input in the control module to determine whether the change in the cold room load is increasing or decreasing. Then, the control module compares the change in the cold room load with the historical operation record recorded in the log in the memory to determine whether there is a load change similar to the change in the historical data. If so, the control module sends each control process to the corresponding refrigeration equipment according to the historical record, so as to quickly control the refrigeration system, and the system responds and adjusts the changes quickly to meet the production requirements, and then ends this control process, collects various parameters, controls the process, generates a record log, and stores it in the control module, so that when there is a similar situation in the future, the system can be quickly controlled; if not, the control module will continue to perform the single cold room control process steps.

[0085] like Figure 3The fault alarm control process of a refrigeration system energy-saving operation scheme analysis method shown in the figure, this step first collects the refrigeration equipment operating parameters such as compressor suction pressure (pz), exhaust pressure (p), exhaust temperature (T), outdoor wet bulb temperature (tw) and cold room temperature (t) according to the control module, and then the control module compares the allowable variable parameter range of each refrigeration equipment during normal operation input by the operator with the collected parameters to determine whether the collected data is within the set normal allowable parameter value range. If the system determines that there are related situations such as low suction pressure, high exhaust pressure, high exhaust temperature, low outdoor wet-bulb temperature, high cold room temperature, etc., it proves that there is an abnormality in the system operation and the operator needs to eliminate the abnormality. At this time, the control module sends an alarm signal to the upper control system of the computer room or the remote monitoring cloud platform according to the data abnormality and generates a record log. The operator can promptly discover the system fault and arrange personnel to eliminate the repair fault. After the fault is eliminated, the operator turns off the alarm prompt in the upper control system or remotely informs the cloud platform monitoring personnel that the fault is eliminated, turns off the alarm prompt, and ends the system fault alarm control process; if the system determines that the collected parameters are all within the normal allowable parameter value range set by them, it means that the system is operating normally, which is equivalent to the system completing a self-test. At this time, the control module will record the time and the operating parameter values ​​of each refrigeration equipment, generate a record log, and transmit the operating parameters and record log back to the upper control system and the remote monitoring cloud platform to end the system fault alarm control process.

[0086] like Figure 4 The multi-cold room control process of a refrigeration system energy-saving operation scheme analysis method shown in the figure, after judging the change of cold room load, the evaporator equipment of multiple cold rooms, i.e., the air cooler, is jointly controlled. First, the control module judges whether the system load change is increasing or decreasing through the cold room temperature (t) and the temperature change (Δt). The specific method of the judgment method is as follows:

[0087] If the cold room load increases, the control module sends a signal to the air cooler to perform a single room cooling load increase control process.

[0088] If the cold room load is reduced, the control module sends a signal to the air cooler to continue the single room cooling load reduction control process.

[0089] When the control module determines that there are multiple cold room load changes, each room is grouped by the control module, and the cold rooms in the group simultaneously carry out the above cold room load change control process. Therefore, the operation of the cold room refrigeration equipment can be quickly adjusted according to the cold room load changes, effectively shortening the system response time, reducing the delay in opening or closing of the refrigeration equipment caused by control judgment, and effectively saving energy.

[0090] The energy-saving scheme analysis and control method enters the cooling fan control process after determining whether the single room load increases or decreases, such as Figure 5 The single cold room control process of a refrigeration system energy-saving operation scheme analysis method shown in the figure includes the following steps:

[0091] If the load increases, assuming that there are L air coolers in a single cold room (L is an integer and L≥2), and each air cooler has B fans (B is an integer and B≥2), then determine whether the C air coolers in operation (C is an integer and C≥1) are running at full load (full load: refers to all fans of a single air cooler are turned on and running at industrial frequency);

[0092] If so, determine whether the full load operation of a single air cooler meets the requirements.

[0093] If not, the C cooling fans in operation maintain the industrial frequency operation, and the Nth cooling fan (N≥2, N is an integer, and N changes from 2 until the value changes to L) in a single cold room starts running with n fans (n≥1, and n is an integer, and n changes from 1 until the value changes to B).

[0094] After all the above steps are completed, the control module determines whether the control meets the load change requirements.

[0095] If yes, then record each control parameter, record the control process, generate a record log, and store it in the memory of the control module for the historical record in step 2 to quickly control the refrigeration equipment.

[0096] If not, the Nth fan in a single cold room turns on n+1 fans. Every time a fan is turned on, it returns to determine whether the cold room load change meets the requirements, until the Nth fan turns on B fans, that is, the Nth fan is running at full load.

[0097] If the load change still does not meet the requirements, continue to turn on the N+1th fan in the single cold room, and turn on n fans. After the above steps are completed, if the load change requirements are still not met, continue to turn on the N+2th fan, and repeat the above steps until L fans are turned on in the single cold room. At this time, the load in the cold room reaches the maximum, and the L fans are all running at full load, and the maximum design load cooling is achieved in the cold room. This can accurately control the temperature and cooling time in the cold room according to the process load changes, so that the operation state of the refrigeration equipment reaches the best.

[0098] like Figure 5 The energy-saving scheme analysis and control method shown in the figure enters the cooling fan control process after determining whether the single room load increases or decreases, which specifically includes the following steps

[0099] If the load decreases, assuming that there are L air coolers in total in a single cold room (L is an integer and L≥2), and each air cooler has B fans (B is an integer and B≥2), then determine whether the N air coolers in operation (N is an integer and N≥2) are running at full load (full load: refers to all fans of a single air cooler are turned on and running at industrial frequency);

[0100] If yes, then determine whether one of the N cooling fans shuts down one fan to meet the requirements. The control module determines whether the single cooling fan in operation shuts down one fan to meet the requirements. If yes, the single cooling fan in operation shuts down one of the fans. If no, the single cooling fan in operation shuts down two or more fans until the single cooling fan shuts down fan B.

[0101] If not, then shut down an idle cooling fan in operation. After all the above steps are completed, the control module determines whether the change in the cold room load at this time meets the requirements.

[0102] If yes, then record each control parameter, record the control process, generate a record log, and store it in the memory of the control module for the historical record in step 2 to quickly control the refrigeration equipment.

[0103] After all the above steps are completed, the control module determines whether the control meets the load change requirements.

[0104] If yes, then record each control parameter, record the control process, generate a record log, and store it in the memory of the control module for the historical record in step 2 to quickly control the refrigeration equipment.

[0105] If not, return to the initial cooling fan reduction control process until the cold room load meets the production requirements.

[0106] After the air cooler control process is completed, the energy-saving scheme analysis and control method enters the evaporative condenser control process.

[0107] like Figure 6 The single evaporative condenser control process of a refrigeration system energy-saving operation scheme analysis method shown in the figure includes the following steps:

[0108] The control module compares the collected exhaust pressure (p) with the allowable exhaust pressure value input by the operator to determine the exhaust pressure change.

[0109] If the exhaust pressure increases, it means that the condensing load increases; further, an idle condenser is turned on and the condenser fan is operated at a reduced frequency.

[0110] Further, it is determined whether the control complies with the load change.

[0111] If so, the control ends.

[0112] If not, return to the initial step and loop the control process until the evaporative condenser control meets the load change requirements.

[0113] If the exhaust pressure decreases, it means that the condensing load is reduced; further, it is determined whether the condenser fan frequency conversion meets the requirements.

[0114] If yes, the condenser fan will run at reduced frequency.

[0115] If not, the condenser fan is off.

[0116] After all the above steps are completed, determine whether the control meets the load change requirements.

[0117] If yes, then end the control

[0118] If not, return to the initial step and loop the control process until the evaporative condenser control meets the load change requirements.

[0119] like Figure 7 The single compressor unit control process of a refrigeration system energy-saving operation scheme analysis method shown in the figure includes the following steps:

[0120] Assuming that there are a total of A compressor units in the system, including 1 variable frequency compressor unit, the number of non-variable frequency compressor units is A-1.

[0121] The control module compares the collected suction pressure (pz) with the allowable suction pressure change value input by the operator to determine the suction pressure change.

[0122] If the suction pressure increases, it means that the cold room load of the refrigeration system increases; further, one of the running compressors is running at full load, and the variable frequency compressor opens at the K% energy level, and K can be 25.

[0123] Further, it is determined whether the compressor control meets the load change requirement.

[0124] If so, the control ends.

[0125] If not, one of the running compressors will run at full load, and the variable frequency compressor will open at an additional 25% capacity.

[0126] Furthermore, until the energy level of the variable frequency compressor reaches 100%, if it is still not enough, another compressor will be turned on to run at full load, and the variable frequency compressor will be reduced to 25% energy level. This cycle will continue until the control meets the load change requirements. When the system is at maximum load, A compressors will be turned on, of which 1 variable frequency compressor will be fully turned on and run at full load, and the remaining A-1 non-variable frequency compressors will be fully turned on and run at full load.

[0127] The compressor control process comprises the steps of:

[0128] The control module determines the change of the suction pressure according to the collected suction pressure.

[0129] If the suction pressure decreases, it means that the system terminal load is reduced; further, one of the running compressors stops running and the variable frequency compressor opens at 75% energy level.

[0130] Further, it is determined whether the compressor control meets the load change requirement.

[0131] If so, the control ends.

[0132] If not, the inverter compressor will operate at a further 25% reduced energy level.

[0133] Furthermore, the inverter compressor is turned off until the energy level reaches 0%. If it is still not satisfied, another compressor is turned off and the inverter compressor is reduced to 75% energy level. This cycle is repeated until the control meets the load change requirements.

[0134] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for analyzing energy-saving operation schemes of a refrigeration system, characterized in that include: Collect multiple operating parameters and environmental parameter information of refrigeration equipment; Determine the load change of the cold room based on the temperature change information of the cold room and the suction pressure change information of the compressor, and analyze whether its load change is similar to the historical record data of the refrigeration system. Based on the judgment results, jointly control the equipment of the entire refrigeration system; If yes, the control module will send each control process to each corresponding refrigeration equipment according to the historical records. If no, the control module will continue to perform the cold room single room control process steps; When analyzing whether the change in cold room load is similar to the historical data of the refrigeration system, the collected data is compared with the data parameters set during the normal operation of the refrigeration system. If the collected data is within the set normal operating parameter range, the time parameter value is recorded, a record log is generated, and the operating parameters are transmitted to the refrigeration room or monitoring cloud platform; If the collected data is not within the set normal operating parameter range, an audible and visual alarm signal will be sent to the refrigeration room or monitoring cloud platform according to the parameter abnormality, and a record log will be generated. The control will end after the alarm is manually closed and the system fault is checked; When judging the change of cold room load, enter the air cooler control process, including the following steps: If the load increases, it is determined whether any of the cooling fans in operation are operating at full load, wherein full load operation means that all fans of a single cooling fan are turned on and operate at industrial frequency; If so, determine whether the full-load operation of a single air cooler meets the requirements; If not, then one of the cooling fans in operation is switched to full-load operation to determine whether the full-load operation of a single cooling fan meets the requirements; After judging whether the full load operation of a single air cooler meets the requirements, If so, the single cooling fan in operation maintains full load operation; If not, the Nth cooling air machine in a single cold room starts running n fans; After the air cooler control process is completed, it is determined whether the load change meets the requirements. If yes, the control is terminated, each control parameter and control process are recorded, and a record log is generated and stored in the control module; If not, the Nth air cooler in a single cold room is turned on, and n+1 fans are running. Each time a fan is turned on, it returns to determine whether the load change meets the requirements, until the Nth air cooler is running at full load. If it is still not enough, the N+1th air cooler in a single cold room is turned on, and n fans are turned on to determine whether the load change meets the requirements. The control process is cyclic until the air cooler control meets the load change requirements; There are L air coolers in a single cold room, L is an integer and L≥2, each air cooler has B fans, B is an integer and B≥2, N≥2, N is an integer, and N changes from 2 until the value changes to L, n≥1, and n is an integer, and n changes from 1 until the value changes to B. After determining whether the cold room load change increases or decreases, enter the air cooler control process, including the steps: If the load decreases, first determine whether any of the cooling fans in operation are running at full load; If so, determine whether the single air cooler can meet the requirement by shutting down one fan; If not, shut down an idle cooling fan in operation; After determining whether the single air cooler can meet the requirements by shutting down one fan, If so, the single cooling fan in operation will shut down one of the fans; If not, two or more fans of a single cooling fan in operation are turned off; After the air cooler control process is completed, determine whether the load change meets the requirements; If yes, then record each control parameter and control process and generate a record log, which is stored in the control module; If not, return to the step of determining whether the cooling fan in operation is running at full load, and loop the control process until the cooling fan control meets the load change requirements; After the air cooler control process is completed, the compressor control process and the evaporative condenser control process are entered; The compressor control process is as follows: According to the collected inhalation pressure, the change of inhalation pressure is judged. If the suction pressure increases, it means that the load at the end of the system increases, one of the compressors in operation is running at full load, and the variable frequency compressor is opened at the K% energy level; Determine whether the compressor control meets the load change requirements, If so, the control ends; If not, one of the running compressors is fully loaded and the variable frequency compressor is opened to the K+25% energy level; Until the inverter compressor energy level reaches 100%, if it is still not enough, then another compressor will be opened to run at full load, and the inverter compressor will be reduced to K% energy level, and this cycle will continue until the control meets the load change requirements; The compressor control process also includes: According to the collected inhalation pressure, the change of inhalation pressure is judged. If the suction pressure decreases, it means that the terminal load of the refrigeration system decreases, then one of the compressors in operation will be stopped and the variable frequency compressor will be opened at M% energy level; Determine whether the compressor control meets the load change requirements, If so, the control ends; If not, the inverter compressor will operate at a 25% lower energy level; Until the inverter compressor energy level reaches 0%, shut down. If it is still not satisfied, shut down another compressor and reduce the inverter compressor energy level to M%. Repeat this cycle until the control meets the load change requirements. The control process of the evaporative condenser is as follows: Determine the exhaust pressure change according to the collected exhaust pressure; If the exhaust pressure increases, it means that the condensing load increases; turn on an idle condenser and reduce the frequency of the condenser fan; Determine whether the control complies with load changes; If so, the control ends; If not, return to the starting step of the evaporative condenser control process, and circulate the control process until the evaporative condenser control meets the load change requirements; If the exhaust pressure decreases, it means that the condensing load is reduced, and it is judged whether the condenser fan frequency conversion meets the requirements; If so, the condenser fan will run at reduced frequency; If not, the condenser fan is off; Determine whether the control meets the load change requirements; If so, the control ends; If not, the process returns to the step of determining the exhaust pressure change according to the collected exhaust pressure, and the control process is circulated until the evaporative condenser control meets the load change requirement.

2. A refrigeration system energy-saving operation scheme analysis method according to claim 1, characterized in that; When judging the change of cold room load according to the change information of cold room temperature, If the cooling room load increases, the refrigeration system sends a signal to the air cooler to continue the control process of increasing the cooling load of a single room; If the cooling room load is reduced, the control module of the refrigeration system sends a signal to the air cooler to continue to execute the control process of reducing the cooling load of the single room.

3. A method for analyzing energy-saving operation schemes of a refrigeration system according to any one of claims 1 to 2, characterized in that: According to the single cold room load control process, load control is performed on multiple cold rooms, including the following steps: When judging whether the cold room is changing in multiple rooms according to the change of warehouse temperature, it is further judged whether the change of cold room load is increasing or decreasing; If the load increases, the single-room cooling system load increase control process logic is used and multiple rooms are implemented simultaneously; Determine whether the temperature changes in all cold rooms meet the requirements; If so, the control ends; If not, return to the starting step of load control of multiple cold rooms, and circulate the control process until the control of multiple cold rooms all meet the load change requirements; According to the single cold room load control process, load control is performed on multiple cold rooms, including: When judging whether the cold room is changing in multiple rooms according to the change of warehouse temperature, it is further judged whether the change of cold room load is increasing or decreasing; If the load is reduced, the single-room cooling system load reduction control process logic is used and multiple rooms are implemented simultaneously; Determine whether the temperature changes in all cold rooms meet the requirements; If so, the control ends; If not, return to the starting step of load control of multiple cold rooms, and circulate the control process until the control of multiple cold rooms all meets the load change requirements.

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