Energy-saving control method, device and controller for cold chain storage refrigeration system

Abstract

The present invention provides an energy-saving control method, device and controller for a cold-chain storage refrigeration system, the method comprising: starting the refrigeration system at a preset time, and starting an automatic air separator to discharge non-condensable gases, determining the current working stage of the refrigeration system, and obtaining the operating parameters of the current working stage monitored in a monitoring system; comparing the operating parameters with a preset threshold, the preset threshold being the parameter limit corresponding to the energy-saving standard corresponding to the current working stage in the refrigeration system; if the operating parameters do not match the preset threshold, issuing a warning so that maintenance personnel can adjust the corresponding equipment parameters in the current working stage. The present invention can perform energy-saving adjustment and management according to the comparison results of the operating parameters with the preset threshold, forming a set of comprehensive energy-saving management and control methods, and realizing comprehensive and timely energy-saving management of cold-chain storage refrigeration systems for fresh products.

Description

Technical Field

[0001] The present invention relates to the field of cold storage energy-saving refrigeration technology, and in particular to an energy-saving control method, device and controller for a cold chain storage refrigeration system. Background Art

[0002] As a necessity for people's livelihood consumption, fresh products have a market size of trillions of yuan, but they consume a lot of energy and emit a lot of carbon during the circulation process. With the increasingly serious problem of high energy consumption in cold chain logistics, energy conservation and emission reduction in the cold chain storage system of fresh products, especially the cold storage refrigeration system, is imminent.

[0003] The energy-saving management system of the cold storage refrigeration system in the existing technology conducts energy efficiency tests before and after the technical transformation of the cold storage refrigeration system, and establishes a big data analysis model for energy-saving efficiency, outputs the energy-saving efficiency analysis results within the test period, and predicts the energy-saving efficiency prediction data after the long-term application of the technical transformation equipment in the future, assists the customer management in deciding whether to adopt the technical transformation plan, and effectively monitors and manages the energy-saving efficiency of the cold storage refrigeration system before and after the technical transformation.

[0004] However, the energy-saving cold storage refrigeration system energy-saving management system provided in the prior art cannot maintain the equipment that does not meet the energy-saving standards at different working stages of the cold chain storage refrigeration system of fresh products, resulting in untimely and incomplete management. Summary of the invention

[0005] The embodiments of the present invention provide an energy-saving control method, device and controller for a cold chain storage refrigeration system to solve the problem in the prior art that equipment that does not meet energy-saving standards at different working stages of a cold chain storage refrigeration system for fresh products cannot be maintained, resulting in untimely and incomplete management.

[0006] In a first aspect, an embodiment of the present invention provides an energy-saving control method for a cold chain storage refrigeration system, comprising: starting the refrigeration system at a preset time, and starting an automatic air separator to discharge non-condensable gas;

[0007] Determine the current working stage of the refrigeration system, and obtain the operating parameters of the current working stage monitored by the monitoring system;

[0008] Comparing the operating parameter with a preset threshold, the preset threshold being a parameter limit corresponding to when energy saving in the current working stage of the refrigeration system reaches a standard;

[0009] If the operating parameters do not match the preset thresholds, a warning is issued so that maintenance personnel can adjust the corresponding equipment parameters in the current working stage.

[0010] In a possible implementation, before starting the refrigeration system at a preset time and starting the automatic air separator to discharge the non-condensable gas, the method further includes:

[0011] Preset thresholds corresponding to the compression stage, the condensation stage, and the evaporation stage of the refrigeration system are determined.

[0012] In a possible implementation, determining a preset threshold corresponding to the refrigeration system in the compression phase includes:

[0013] According to the suction temperature of the compressor, determine the corresponding condensing temperature and evaporating temperature when the compressor reaches the energy saving standard;

[0014] Determine the power and quantity of the compressors according to the cold chain storage area and the cooling load per unit area, and determine the type of compressor to be turned on according to the amount of goods, the compressor types include single-stage compressors and two-stage compressors;

[0015] When the cylinder wall of the compressor is in a frosted state, the current opening of the liquid supply valve of the compressor is used as the maximum opening of the liquid supply valve;

[0016] Based on the different oil levels of the compressor, a maximum oil level and a regular oil draining cycle corresponding to a minimum oil consumption are determined.

[0017] In a possible implementation, determining the condensing temperature and evaporating temperature corresponding to when the compressor energy saving standard is reached according to the suction temperature of the compressor includes:

[0018] Keeping the suction temperature of the compressor unchanged, determining the power consumption per unit refrigeration capacity corresponding to different condensing temperatures;

[0019] According to the unit cooling power consumption corresponding to different condensing temperatures, determine the condensing temperature corresponding to the minimum unit cooling power consumption;

[0020] Keeping the condensing temperature of the compressor unchanged, determining the unit shaft power refrigeration capacity corresponding to different evaporation temperatures;

[0021] According to the unit shaft power cooling capacity corresponding to different evaporating temperatures, the evaporating temperature corresponding to the highest unit shaft power cooling capacity is determined.

[0022] In a possible implementation, determining the oil level and the periodic oil draining cycle corresponding to the minimum oil consumption based on different oil level heights of the compressor includes:

[0023] Determine the corresponding oil consumption based on different oil level heights of the compressor, and monitor the thickness of the oil film on the pipe wall of the refrigeration system when the compressor is running;

[0024] According to the obtained fuel consumption, determine the maximum fuel level height corresponding to the minimum fuel consumption;

[0025] Determine the time it takes for the oil film thickness to reach a preset thickness from zero, and set this time as the regular oil drain cycle.

[0026] In a possible implementation, determining a preset threshold corresponding to the refrigeration system in the condensing stage includes:

[0027] Determine the venting point of the non-condensable gas, monitor the exhaust pressure and exhaust temperature of the refrigeration system, and determine the cycle of venting the non-condensable gas according to the exhaust pressure and the exhaust temperature;

[0028] Monitor the scale thickness and heat transfer coefficient of the condenser to determine the maximum scale thickness corresponding to the decrease of the heat transfer coefficient of the condenser;

[0029] The pressure of the pressure equalizing pipe of the condenser and the liquid output of the liquid outlet pipe of the condenser are monitored to determine the maximum pressure and the maximum liquid output at which the condenser does not accumulate liquid.

[0030] In a possible implementation, determining a preset threshold corresponding to the evaporation stage of the refrigeration system includes:

[0031] The thermal resistance of the evaporator tube caused by the frost layer is taken as the maximum thermal resistance;

[0032] According to the size of the warehouse door and the preset cooling loss value, determine the maximum time and maximum number of times the cold chain warehouse door can be opened.

[0033] In a possible implementation, the monitoring system includes a temperature monitoring subsystem, an energy consumption monitoring subsystem, a refrigeration monitoring subsystem, and an operation management monitoring subsystem;

[0034] The temperature monitoring subsystem includes a plurality of temperature sensors for monitoring the temperature of preset equipment and cold chain storage in the refrigeration system;

[0035] The energy consumption monitoring subsystem includes a smart electricity meter and a smart oil meter, which are used to monitor the energy consumption and current data of the compressor unit, condenser and air cooler in the refrigeration system in real time;

[0036] The refrigeration monitoring subsystem is used to monitor the operating time and equipment status of each device in the refrigeration system;

[0037] The operation management monitoring subsystem is used to monitor the opening and closing status and opening and closing time of the warehouse door.

[0038] In a second aspect, an embodiment of the present invention provides an energy-saving control device for a cold chain storage refrigeration system, comprising:

[0039] A control module, used to start the refrigeration system at a preset time and start the automatic air separator to discharge non-condensable gas;

[0040] A determination module, used to determine the current working stage of the refrigeration system and obtain the operating parameters of the current working stage monitored by the monitoring system;

[0041] The control module is further used to compare the operating parameter with a preset threshold value, where the preset threshold value is a parameter limit value corresponding to the energy saving standard corresponding to the current working stage of the refrigeration system;

[0042] The control module is also used to issue a warning if the operating parameter does not match the preset threshold value, so that maintenance personnel can adjust the corresponding equipment parameters in the current working stage.

[0043] In a third aspect, an embodiment of the present invention provides a controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the energy-saving control method for a cold chain warehouse refrigeration system as described in the first aspect or any possible implementation method of the first aspect are implemented.

[0044] The embodiment of the present invention provides an energy-saving control method, device and controller for a cold chain storage refrigeration system. By starting the refrigeration system at a preset time and turning on the automatic air separator to discharge non-condensable gases, the refrigeration capacity can be increased and the power consumption can be reduced. In addition, by determining the current working stage of the refrigeration system and obtaining the operating parameters of the current working stage monitored in the monitoring system; comparing the operating parameters with the preset threshold, the preset threshold is the parameter limit corresponding to the energy saving standard corresponding to the current working stage in the refrigeration system; if the operating parameters do not match the preset threshold, a warning is issued so that maintenance personnel can adjust the corresponding equipment parameters in the current working stage. The embodiment of the present invention can specifically compare the operating parameters in each working stage of the refrigeration system with the corresponding preset threshold, so as to perform energy-saving adjustments and management according to the comparison results, forming a set of comprehensive energy-saving management and control methods, and realizing comprehensive and timely energy-saving management of the cold chain storage refrigeration system for fresh products. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1is a flow chart for implementing an energy-saving control method for a cold chain storage refrigeration system provided by an embodiment of the present invention;

[0047] Figure 2 is a flow chart for implementing an energy-saving control method for a cold chain storage refrigeration system provided by another embodiment of the present invention;

[0048] Figure 3 is a flowchart for determining a preset threshold corresponding to a refrigeration system in a compression phase provided by an embodiment of the present invention;

[0049] Figure 4 is a flowchart for determining a preset threshold corresponding to a refrigeration system in a condensing stage provided by an embodiment of the present invention;

[0050] Figure 5 is a flowchart for determining a preset threshold value corresponding to an evaporation stage of a refrigeration system provided by an embodiment of the present invention;

[0051] Figure 6 is a structural schematic diagram of an energy-saving control device for a cold chain storage refrigeration system provided by an embodiment of the present invention;

[0052] Figure 7 is a schematic diagram of a controller provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0054] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0055] As a necessity for people's livelihood consumption, fresh products have a market size of trillions of yuan, but they consume a lot of energy and emit a lot of carbon during the circulation process. With the increasingly serious problem of high energy consumption in cold chain logistics, energy conservation and emission reduction in the cold chain storage system of fresh products, especially the cold storage refrigeration system, is imminent.

[0056] However, due to the lack of corresponding energy-saving management systems in enterprises, the phenomenon of neglecting energy management and wasting energy has repeatedly occurred in cold storage operations. Therefore, this paper analyzes and studies the energy consumption of cold chain logistics, explores energy-saving measures and methods in the operation of refrigeration systems, establishes a cold chain storage refrigeration system management platform process, and uses scientific management methods in the use and management of cold storage to achieve green and low-carbon cold chain storage systems for fresh products.

[0057] In the prior art, an energy-saving control method for a refrigeration system is disclosed, which collects data information and constructs a mathematical model, uses algorithm trial and error to obtain the optimal solution, realizes the coordinated operation of various execution devices of the refrigeration system, and stores the corresponding data information in the information database in the numerical process operation of gradually trial and error to approach the actual optimal solution, so that the data in the information database can be directly retrieved and used to achieve the highest energy efficiency and the most energy-saving state of the refrigeration system. The air-conditioning refrigeration system described in it is different from the field of this solution, and many energy consumption factors in the operation of the cold storage are not considered, so it is not suitable for the refrigeration system of the cold chain storage system of fresh products.

[0058] Another cold storage refrigeration system energy-saving management system, through energy efficiency testing before and after the technical transformation of the cold storage refrigeration system, and the establishment of energy-saving efficiency big data analysis model, outputs the energy-saving efficiency analysis results within the test period, predicts the energy-saving efficiency prediction data after the long-term application of the technical transformation equipment in the future, assists the customer management to decide whether to adopt the technical transformation plan, and effectively monitors and manages the energy-saving efficiency of the cold storage refrigeration system before and after the technical transformation. It studies the comparative analysis of energy-saving efficiency and economy before and after the technical transformation of the cold storage refrigeration system. It is an efficiency calculation method model that assists the management in making decisions, and does not involve energy-saving issues in the use and management of cold storage.

[0059] An embodiment of the present invention provides an energy-saving control method for a cold chain warehouse refrigeration system. The monitoring system monitors the operating parameters of each device and the environment in the refrigeration system in the cold chain warehouse, and compares the operating parameters with the corresponding preset thresholds in the corresponding working stage in the refrigeration system, so as to timely discover the equipment that does not meet the energy-saving standard in the current working stage, so as to perform maintenance in time, so that the equipment in the current working stage meets the energy-saving standard, thereby reducing the energy consumption of the cold chain warehouse.

[0060] Figure 1 A flow chart of an implementation method of an energy-saving control method for a cold chain storage refrigeration system provided by an embodiment of the present invention is described in detail as follows:

[0061] Step 101, start the refrigeration system at a preset time, and start the automatic air separator to discharge non-condensable gas.

[0062] In one embodiment, without affecting the quality of food refrigeration, the operating time of the refrigeration compressor during the day, especially at noon, is reduced as much as possible, and the operating time of the refrigeration compressor at night is increased. The condensing temperature of the compressor at night is lower, which can not only reduce the power consumption of the compressor, but also reduce the electricity bill by utilizing the peak and valley difference of the electricity bill, thereby achieving the purpose of energy saving and carbon reduction.

[0063] Optionally, the preset time may be at night, for example, the preset time may be a time range, for example, from 23:00 to 6:00 of the next day.

[0064] An automatic air separator is installed in the cold chain warehouse. The non-condensable gases in the refrigeration system are mainly concentrated on the high-pressure side of the system. Therefore, the venting point can be set on the ammonia storage tank and the condenser. After the refrigeration system is started, the automatic air separator is started, and the high-pressure ammonia liquid enters the automatic air separator after throttling to cool the mixed gas, completing the separation of non-condensable gases and ammonia. The non-condensable gases are discharged and the ammonia continues to operate, thereby increasing the refrigeration capacity and reducing power consumption.

[0065] Step 102, determining the current working stage of the refrigeration system, and obtaining the operating parameters of the current working stage monitored by the monitoring system.

[0066] The working stages of the refrigeration system can be divided into three stages: compression stage, condensation stage and evaporation stage. The operating parameters of each working stage can be monitored through the monitoring system.

[0067] Modern communication, Internet of Things interaction, real-time database, cloud computing, cloud storage and other technologies are used to collect real-time energy consumption information of cold chain storage cold storage refrigeration systems, such as using smart electricity meters and smart oil meters to collect electricity consumption, fuel consumption and other related information; data is analyzed, processed and monitored online, linear dynamic analysis is performed, and warnings are issued for high energy consumption factors, so that each link of the refrigeration system can be adjusted in time, and data can be saved and tracked in real time.

[0068] Access to the Internet to realize a browsing management system with no limit on the number of visited sites. Mobile phones, tablet computers and other terminal devices can be used to browse on-site data anytime and anywhere, and alarm information can be pushed by E-mail, etc.

[0069] Access the cloud data center to track changes in different seasons and production conditions through the Internet, and fully tap the system's energy-saving potential.

[0070] By using data acquisition modules, status collectors, related communications, signal acquisition and other hardware facilities, the system's operating status can be monitored, controlled, analyzed and summarized as a whole, forming real-time and historical data aggregation, reporting, storage and remote data access.

[0071] Optional, see Figure 2 As shown, the monitoring system includes a temperature monitoring subsystem, an energy consumption monitoring subsystem, a refrigeration monitoring subsystem, and an operation management monitoring subsystem;

[0072] The temperature monitoring subsystem includes multiple temperature sensors, which are used to monitor the temperature of preset equipment in the refrigeration system and cold chain storage; for example, to realize warehouse temperature monitoring, cold room temperature monitoring, etc.

[0073] The energy consumption monitoring subsystem includes smart electricity meters and smart oil meters, which are used to monitor the energy consumption and current data of the compressor unit, condenser, and air cooler in the refrigeration system in real time; it can also save historical energy consumption data to facilitate the optimization of subsequent systems and operations. For example, the monitoring of liquid level, oil level height of hydraulic press, evaporation temperature, evaporation pressure, condensation temperature and condensation pressure, etc.

[0074] The monitoring subsystem controller of smart meters and other related equipment should use the corresponding refrigeration system controller series products for control and communication.

[0075] The refrigeration monitoring subsystem is used to monitor the operating time and equipment status of each device in the refrigeration system.

[0076] The operation management monitoring subsystem is used to monitor the opening and closing status and opening and closing time of the warehouse doors.

[0077] In addition, the operation and management monitoring subsystem can also monitor the status of operation and management equipment such as platform doors. By connecting to the status output of the cold storage door, the specific number of opening and closing times and duration of the cold storage door are counted, and the stored data provides a basis and guidance for future standardized operations. The controller of the monitoring subsystem for the opening and closing status of the cold storage door should use a reasonably configured refrigeration system controller series product for control and communication.

[0078] On the basis of all these monitoring subsystems, the monitoring host will be managed uniformly in the computer room through system communication and connected through the network to further realize remote monitoring, and conduct overall monitoring of the temperature, energy consumption, alarm information and other operating conditions of the refrigeration system. The monitoring data can be connected to the equipment remote control platform, and the monitoring platform will regularly issue operation reports for the cold storage to timely understand the operation status of the cold storage and promptly remind the equipment of maintenance time, so as to minimize the failure and shutdown caused by untimely maintenance.

[0079] Step 103, comparing the operating parameter with a preset threshold value, where the preset threshold value is a parameter limit value corresponding to when the energy saving standard is met in the current working stage of the refrigeration system.

[0080] In one embodiment, before starting the refrigeration system at a preset time and starting the automatic air separator to discharge the non-condensable gas, the method further includes:

[0081] Determine the preset thresholds corresponding to the compression stage, condensation stage and evaporation stage of the refrigeration system.

[0082] In this embodiment, starting from the working process of the cold storage refrigeration system, the main energy consumption factors in the compression stage, condensation stage and evaporation stage are analyzed, and the thresholds for energy saving and carbon reduction are determined, so that the cold chain storage refrigeration system can achieve energy saving standards in each working stage, thereby achieving the energy saving effect of the entire refrigeration system.

[0083] In one embodiment, see Figure 3 As shown, determining the preset threshold corresponding to the compression stage of the refrigeration system may include various steps, but the order of the various steps is not limited in this embodiment, which is only for the convenience of description.

[0084] Step 301, according to the suction temperature of the compressor, determine the condensing temperature and evaporating temperature corresponding to when the compressor energy saving standard is met.

[0085] The compressor is the main electrical equipment in the cold storage, accounting for 60% of the enterprise's electricity consumption in actual operation. During actual use, attention should be paid to its evaporation temperature, evaporation pressure and condensation temperature.

[0086] Reasonable determination of the evaporation temperature of the cold storage refrigeration system is very important for energy saving. For every 1°C decrease in the evaporation temperature, 3% to 4% more energy is consumed. Increasing the evaporation temperature, that is, a smaller temperature difference between the evaporation temperature and the cold storage temperature, is conducive to reducing dry consumption and saving electricity at the same time.

[0087] When the suction temperature of the compressor remains unchanged, the condensation temperature increases, the unit volume cooling capacity decreases, the compression ratio increases, and the energy consumption for producing the same cooling capacity increases. When the compressor suction temperature is -15℃, and the condensation temperature drops from 35℃ to 30℃, the unit shaft power cooling capacity E increases from 2.97 to 3.36, an increase of 13%. When the evaporation temperature is -10℃, the power consumption of the compressor unit cooling capacity can be reduced by 2.5%-3.2% for every 1℃ drop in the condensation temperature, so the condensation temperature should be kept low.

[0088] In one embodiment, determining the condensing temperature and evaporating temperature corresponding to when the compressor reaches the energy saving standard according to the suction temperature of the compressor may include:

[0089] Keep the suction temperature of the compressor unchanged and determine the power consumption per unit cooling capacity corresponding to different condensing temperatures; based on the power consumption per unit cooling capacity corresponding to different condensing temperatures, determine the condensing temperature corresponding to the lowest power consumption per unit cooling capacity.

[0090] It can be understood that when the condensing temperature monitored by the energy consumption monitoring subsystem in the monitoring system is greater than the condensing temperature calculated above, it can be considered that the energy saving standard is not met. At this time, an early warning can be issued so that maintenance personnel can adjust certain parameters of the compressor to reduce the current condensing temperature.

[0091] Optionally, when the condensing temperature remains unchanged, the evaporation temperature is increased, the suction pressure of the compressor increases accordingly, the specific volume of the inhaled steam decreases, the unit volume refrigeration capacity increases, the compression ratio decreases, and the energy consumption is reduced when producing the same refrigeration capacity, thereby increasing the unit shaft power refrigeration capacity of the compressor. Taking the 8AS-12.5 single-pole compressor as an example (motor power 95kw), when the condensing temperature t1 = 35℃, when the evaporation temperature increases from -15℃ to -10℃, the unit shaft power refrigeration capacity E increases from 2.94 to 3.58, an increase of 22%, saving 95×0.22=20.9 (kw) of electric energy.

[0092] Therefore, optionally, after determining the condensing temperature corresponding to the lowest power consumption per unit cooling capacity, the condensing temperature of the compressor is kept unchanged, and the unit shaft power cooling capacity corresponding to different evaporating temperatures is determined; based on the unit shaft power cooling capacity corresponding to different evaporating temperatures, the evaporating temperature corresponding to the highest unit shaft power cooling capacity is determined, and this evaporating temperature is the evaporating temperature threshold.

[0093] In summary, the condensing temperature should be kept low during the compression stage, and the evaporation temperature should be increased at a low condensing temperature, so that the energy-saving benefit of the compressor will be more significant.

[0094] Step 302, determine the power and quantity of the compressors according to the area of ​​the cold chain storage and the cooling load per unit area, and determine the type of compressor to be turned on according to the amount of goods. The compressor types include single-stage compressors and two-stage compressors.

[0095] Taking the JZVLG268D screw compressor unit as an example, the standard rated motor speed of the screw compressor is 2960r / min. When a motor with a rated speed of 1450r / min is used, the refrigeration capacity of the compressor and the air supply bypass load are halved. Therefore, in practical applications, the power and number of compressor units should be determined based on the area of ​​cold chain storage and the unit area cooling load, so that the compressor can be operated at full load as much as possible.

[0096] Optionally, the required total refrigeration capacity can be calculated based on the area of ​​the cold chain storage and the cooling load per unit area, and then the power and number of compressors can be determined based on the cooling load demand.

[0097] The cooling capacity of the compressor can be selected as single-stage or double-stage. When determining the type of compressor, it can be based on the amount of goods. That is, if a large amount of goods needs to be frozen quickly, for example, the amount of goods is greater than the first preset weight, a two-stage compressor must be used. At this time, using a two-stage compressor is not only beneficial to saving power consumption, but also beneficial to the maintenance, maintenance and safe operation of machinery and equipment. If there are not many goods in the off-season, for example, the amount of goods is less than the second preset weight, and the second preset weight is less than the first preset weight, a single-stage compressor with large cooling capacity can be selected to reduce the number of compressors, thereby reducing power consumption.

[0098] Step 303: When the cylinder wall of the compressor is in a frosted state, the current opening of the liquid supply valve of the compressor is used as the maximum opening of the liquid supply valve.

[0099] During the operation of the compressor, when frost appears on the cylinder wall of the compressor, the suction temperature and exhaust temperature of the compressor will drop significantly. If the frost is severe, liquid hammer will occur. Generally, frost comes because the liquid supply valve is opened too large, or the compressor has a large cooling capacity and a small heat load, and the suction volume is greater than the evaporation volume, resulting in a drop in evaporation pressure, and the unevaporated refrigerant liquid is sucked into the compressor to cause a wet stroke. At this time, the compressor needs to be adjusted and the opening of the liquid supply valve needs to be adjusted. The wet stroke is not only detrimental to safe operation, but also causes increased energy consumption. Therefore, the opening size of the liquid supply valve should be reasonably adjusted to keep the evaporation pressure within a suitable range, thereby reducing the wet stroke and reducing energy consumption.

[0100] Therefore, when the monitoring system detects that the cylinder wall of the compressor is frosted and the opening of the compressor's liquid supply valve is greater than the maximum opening of the liquid supply valve calculated above, the opening of the liquid supply valve is lowered.

[0101] In actual use, the opening of the liquid supply valve can be further determined based on the temperature of the cold chain warehouse, the evaporation pressure, and the temperature of the goods. If the warehouse temperature meets the requirements but the evaporation pressure is low, the machine should be shut down in time. That is, if the temperature of the cold chain warehouse is within the preset temperature range, but the evaporation pressure is less than the preset pressure, the opening of the compressor's liquid supply valve will be reduced to zero to prevent frost on the compressor cylinder wall. When the goods need to be quickly frozen, the goods have not met the temperature requirements, but the warehouse temperature has met the requirements, the liquid supply should be reduced and the compressor and air cooler should be reduced. That is, when the temperature of the cold chain warehouse is within the preset temperature range, but the temperature of the goods is greater than the preset temperature, the opening of the compressor's liquid supply valve should be reduced to prevent the evaporation pressure from being low and causing waste of electricity consumption.

[0102] Step 304 , based on different oil levels of the compressor, determine the maximum oil level and the periodic oil drain cycle corresponding to the minimum oil consumption.

[0103] Some small and medium-sized cold storages along the coast use more piston compressors. Piston compressors use lubricating oil to lubricate parts. When the compressor is running, the exhaust temperature is generally between 100 and 130°C, and a small part of the lubricating oil will inevitably vaporize into particulate oil vapor and enter the refrigeration system along with the refrigerant gas. If a 0.1m oil film adheres to the pipe wall of the refrigeration system, the refrigeration efficiency will be reduced by about 15%. Therefore, the oil should be drained in time to reduce the oil adhering to the pipe wall of the condenser, evaporator and other equipment, which will lead to a decrease in refrigeration efficiency.

[0104] In one embodiment, based on different oil level heights of the compressor, determining the oil level height corresponding to the minimum oil consumption and the periodic oil draining cycle may include:

[0105] Determine the corresponding oil consumption based on the different oil level heights of the compressor, and monitor the oil film thickness of the pipe wall of the refrigeration system when the compressor is running;

[0106] According to the obtained fuel consumption, determine the maximum fuel level height corresponding to the minimum fuel consumption;

[0107] Determine the time it takes for the oil film thickness to reach a preset thickness from zero, and set this time as the regular oil drain cycle.

[0108] During operation, the higher the oil pressure and oil level of the compressor, the greater the oil consumption. The traditional operation oil level is controlled at 1 / 2 to 2 / 3 of the oil level mirror, and practice has proved that the oil level is better controlled at 1 / 3 of the oil level mirror, and the oil consumption can be reduced by 2 to 3 times. Therefore, the oil pressure of the compressor should be strictly controlled during operation, and the oil level should be reduced as much as possible, which not only reduces oil consumption, but also saves electricity consumption.

[0109] In one embodiment, see Figure 4 As shown, determining the preset threshold corresponding to the refrigeration system in the condensing stage may include various steps, wherein the execution order of the various steps is not limited.

[0110] Step 401, determine the venting point of the non-condensable gas, monitor the exhaust pressure and exhaust temperature of the refrigeration system, and determine the cycle of venting the non-condensable gas according to the exhaust pressure and exhaust temperature.

[0111] Research has shown that when non-condensable gases are mixed in the refrigeration system and their partial pressure reaches 0.2MPa, the cooling capacity will drop by 8% and power consumption will increase by 18%. Therefore, the non-condensable gases in the refrigeration system need to be discharged.

[0112] When the refrigeration equipment of the cold storage is inspected and refrigerant and lubricant are added, non-condensable gas enters the system due to improper operation. Non-condensable gas will not be cooled into liquid in the refrigeration system, but will accumulate in the condenser, which will reduce the condensation area, increase the condensation pressure, cause the refrigeration capacity to decrease and the power consumption to increase. An automatic air separator is set up. In the refrigeration system, non-condensable gas is mainly concentrated on the high-pressure side of the system, so the venting point is selected on the ammonia storage tank and the condenser. When the refrigeration system is started, the automatic air separator starts to work, and the high-pressure ammonia liquid enters the automatic air separator after throttling, cools the mixed gas, completes the separation of non-condensable gas and ammonia, and the non-condensable gas is discharged. Therefore, the exhaust pressure and exhaust temperature are observed during operation to determine whether there is non-condensable gas in the system, and determine the duration of non-condensable gas in the refrigeration system. This duration is used as the cycle of discharging non-condensable gas, and the non-condensable gas is removed in time to reduce the condensation pressure, so as to achieve the purpose of saving power consumption.

[0113] Step 402, monitoring the scale thickness in the condenser and the heat transfer coefficient of the condenser, and determining the scale thickness corresponding to a decrease in the heat transfer coefficient of the condenser.

[0114] Studies have shown that if the scale in the condenser is 1.5mm, the condensation temperature will rise by 2.8℃ and the power consumption will increase by 9.7%. Therefore, the relationship between the monitored scale thickness and the condenser heat transfer coefficient can be used to determine the scale thickness corresponding to the decrease in the condenser heat transfer coefficient, and this scale thickness can be used as the maximum scale thickness. When the monitoring system detects that the scale thickness is greater than the maximum scale thickness, an alarm message will be issued so that maintenance personnel can remove the scale in time.

[0115] Optionally, manual, mechanical, chemical or electrostatic descaling methods can be used to remove the condenser scale in time to improve the heat transfer coefficient of the condenser. Currently, there are three methods for removing condenser scale: one is to use an electrostatic scale controller to prevent and remove scale; the second is to use a flexible shaft pipe cleaner for mechanical descaling; the third is to use chemical pickling to remove scale.

[0116] Step 403, monitor the pressure of the pressure equalizing pipe of the condenser and the liquid output of the liquid outlet pipe of the condenser to determine the maximum pressure and maximum liquid output at which the condenser does not accumulate liquid.

[0117] If there is an oil film of 0.1 mm in the condenser, the condensation temperature will increase by 1°C, the cooling capacity will decrease by 1.4%, and the power consumption will increase by 2.9%. Therefore, in order to reduce power consumption, it is necessary to prevent liquid accumulation in the condenser.

[0118] When the monitoring system detects that the pressure of the condenser's equalizing pipe is greater than the above-mentioned maximum pressure, or the liquid discharge of the liquid discharge pipe is greater than the above-mentioned maximum liquid discharge, a warning will be issued so that maintenance personnel can promptly clear the equalizing pipe or liquid discharge pipe of the condenser.

[0119] In addition, defrost, ice-melting water and waste crushed ice can be used to lower the cooling water temperature to achieve the purpose of lowering the condensation temperature, and to achieve the purpose of saving water through the wastewater circulation pool. That is, the defrost wastewater, ice-melting water and waste crushed ice generated by the evaporator and the air cooler during the evaporation stage are stored in the wastewater circulation pool to circulate and cool the cooling water.

[0120] In one embodiment, see Figure 5 As shown, determining the preset threshold corresponding to the evaporation stage of the refrigeration system may include the following steps, and the order of the steps is not limited:

[0121] Step 501: taking the thermal resistance of the evaporation tube of the evaporator due to the frost layer as the maximum thermal resistance.

[0122] When the refrigerant in the evaporator evaporates, it absorbs the wet air in the cold storage and forms a frost layer on the surface of the evaporator tube. If the frost layer is not removed in time, it will accumulate and become thicker. After the outer surface of the evaporator is frosted, the thermal resistance of the frost layer is 80 times greater than that of steel, so the heat transfer effect is weakened, resulting in a decrease in the evaporation temperature and an increase in the power consumption of the cold storage. Therefore, the evaporator should be defrosted regularly.

[0123] In one embodiment, the thermal resistance corresponding to the formation of frost on the evaporator tube of the evaporator is monitored, and this thermal resistance is taken as the maximum thermal resistance. When the monitoring system detects that the thermal resistance of the evaporator tube of the evaporator is greater than the maximum thermal resistance, an alarm is issued so that maintenance personnel can remove the frost on the evaporator tube of the evaporator as soon as possible.

[0124] Optionally, waste heat recovery technology can be applied to fully utilize the heat discharged from the refrigeration system for floor heating or hot ammonia defrosting, thereby reducing the power consumption of thermal equipment.

[0125] The hot ammonia defrosting method has little impact on the storage temperature because the heating and defrosting expand from the inside to the outside. The temperature drops quickly after defrosting, and its power consumption is only one-fifth of that of water defrosting. In the cold storage currently designed with a combined water and hot ammonia defrosting method, choosing a combined water and hot ammonia defrosting method is more energy-efficient than a simple water defrosting method.

[0126] Step 502, determining the maximum time and maximum number of times to open the cold chain warehouse door according to the size of the warehouse door and the preset cooling loss value.

[0127] When the cold chain warehouse door is opened, hot air penetrates into the warehouse, which not only causes the warehouse temperature to rise, but also causes the hot air with a large amount of water vapor from the outside to enter the warehouse and be cooled, causing frost on the evaporator exhaust pipe, increasing the defrosting load, causing humidity fluctuations in the warehouse, and affecting the quality of food. In addition, when the warehouse door is opened during defrosting, the temperature rises more than twice as fast as when the door is closed. Therefore, reducing the number and time of opening the cold storage door is of great significance to energy saving. At the same time, the cold storage door should be effectively maintained, the performance of the heat insulation and airproof layer should be checked regularly, ice, frost, and water should be handled at any time, the tightness of the cold storage door should be maintained, and collisions between transportation vehicles and the cold storage door should be prevented to ensure that the cold storage door is opened and closed without failure. In addition, the installation of PVC curtains or wind curtains can greatly reduce the cooling consumption when opening the door.

[0128] For example, the temperature of a cold storage is -20℃, the relative humidity is 90%, the temperature of the hall outside the door is 20℃, the relative humidity is 60%, the size of the cold storage door is 1.2×2㎡, and the door is opened 10 times, each time for 3 minutes. If there is no anti-airflow facility at the door, the cooling loss is 4.2kw, and the warehouse temperature rises by more than 3℃.

[0129] Therefore, in this embodiment, the maximum time and maximum number of times to open the cold chain storage door are determined according to the size of the door and the preset cooling loss value. Since the door is opened every day, the preset cooling loss value can be understood as the maximum value that the cooling loss can withstand.

[0130] Step 104: If the operating parameters do not match the preset thresholds, a warning is issued so that maintenance personnel can adjust the corresponding equipment parameters in the current working stage.

[0131] The embodiment of the present invention starts the refrigeration system at a preset time and starts the automatic air separator to discharge non-condensable gases, so as to increase the refrigeration capacity and reduce power consumption. In addition, by determining the current working stage of the refrigeration system and obtaining the operating parameters of the current working stage; comparing the operating parameters with the preset threshold value, the preset threshold value is the parameter limit corresponding to the energy saving standard corresponding to the current working stage in the refrigeration system; if the operating parameters do not match the preset threshold value, a warning is issued so that maintenance personnel can adjust the corresponding equipment parameters in the current working stage. The embodiment of the present invention analyzes the factors affecting energy consumption based on the monitoring data of each working stage and determines the corresponding threshold value, so that energy-saving adjustment and management can be carried out for each working stage in the refrigeration system in a targeted manner, forming a set of comprehensive energy-saving management and control methods, and achieving comprehensive energy-saving effects on the cold chain storage refrigeration system of fresh products.

[0132] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0133] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0134] Figure 6 The following is a schematic diagram showing the structure of an energy-saving control device for a cold chain storage refrigeration system provided by an embodiment of the present invention. For ease of explanation, only the parts related to the embodiment of the present invention are shown, which are described in detail as follows:

[0135] like Figure 6 As shown, the energy-saving control device 6 of the cold chain storage refrigeration system includes: a control module 61 and a determination module 62.

[0136] The control module 61 is used to start the refrigeration system at a preset time and start the automatic air separator to discharge the non-condensable gas;

[0137] A determination module 62 is used to determine the current working stage of the refrigeration system and obtain the operating parameters of the current working stage monitored by the monitoring system;

[0138] The control module 61 is further used to compare the operating parameter with a preset threshold value, where the preset threshold value is a parameter limit value corresponding to the energy saving standard corresponding to the current working stage in the refrigeration system;

[0139] The control module 61 is also used to issue a warning if the operating parameters do not match the preset thresholds, so that maintenance personnel can adjust the corresponding equipment parameters in the current working stage.

[0140] In a possible implementation, before the control module 6161 starts the refrigeration system at a preset time and starts the automatic air separator to discharge the non-condensable gas, the determination module 62 is further used to:

[0141] Determine the preset thresholds corresponding to the compression stage, condensation stage and evaporation stage of the refrigeration system.

[0142] In a possible implementation, when the determination module 62 determines the preset threshold corresponding to the compression stage of the refrigeration system, it is used to:

[0143] According to the suction temperature of the compressor, determine the corresponding condensing temperature and evaporating temperature when the compressor reaches the energy saving standard;

[0144] Determine the power and quantity of the compressors according to the cold chain storage area and the cooling load per unit area, and determine the type of compressor to be turned on according to the amount of goods. The compressor types include single-stage compressors and two-stage compressors;

[0145] When the cylinder wall of the compressor is frosted, the current opening of the liquid supply valve of the compressor is used as the maximum opening of the liquid supply valve;

[0146] Based on the different oil level heights of the compressor, determine the maximum oil level height and regular oil drain cycle corresponding to the minimum oil consumption.

[0147] In a possible implementation, when the determination module 62 determines the condensing temperature and evaporating temperature corresponding to when the compressor energy saving standard is reached according to the suction temperature of the compressor, it is used to:

[0148] Keep the suction temperature of the compressor unchanged and determine the power consumption per unit of cooling capacity corresponding to different condensing temperatures;

[0149] According to the unit cooling power consumption corresponding to different condensing temperatures, determine the condensing temperature corresponding to the minimum unit cooling power consumption;

[0150] Keep the condensing temperature of the compressor unchanged and determine the cooling capacity per unit shaft power corresponding to different evaporation temperatures;

[0151] According to the unit shaft power cooling capacity corresponding to different evaporating temperatures, the evaporating temperature corresponding to the highest unit shaft power cooling capacity is determined.

[0152] In a possible implementation, the determination module 62 determines the oil level and the periodic oil drain cycle corresponding to the minimum oil consumption based on different oil level heights of the compressor, and is used to:

[0153] Determine the corresponding oil consumption based on the different oil level heights of the compressor, and monitor the oil film thickness of the pipe wall of the refrigeration system when the compressor is running;

[0154] According to the obtained fuel consumption, determine the maximum fuel level height corresponding to the minimum fuel consumption;

[0155] Determine the time it takes for the oil film thickness to reach a preset thickness from zero, and set this time as the regular oil drain cycle.

[0156] In a possible implementation, when the determination module 62 determines the preset threshold corresponding to the condensing stage of the refrigeration system, it is used to:

[0157] Determine the venting point of non-condensable gas, monitor the exhaust pressure and temperature of the refrigeration system, and determine the cycle of venting non-condensable gas based on the exhaust pressure and temperature;

[0158] Monitor the scale thickness and heat transfer coefficient of the condenser to determine the maximum scale thickness corresponding to the decrease of the heat transfer coefficient of the condenser;

[0159] Monitor the pressure of the pressure equalizing pipe of the condenser and the liquid output of the liquid outlet pipe of the condenser to determine the maximum pressure and maximum liquid output at which the condenser does not accumulate liquid.

[0160] In a possible implementation, when the determination module 62 determines the preset threshold corresponding to the evaporation stage of the refrigeration system, it is used to:

[0161] The thermal resistance of the evaporator tube caused by the frost layer is taken as the maximum thermal resistance;

[0162] According to the size of the warehouse door and the preset cooling loss value, determine the maximum time and maximum number of times the cold chain warehouse door can be opened.

[0163] In a possible implementation, the monitoring system includes a temperature monitoring subsystem, an energy consumption monitoring subsystem, a refrigeration monitoring subsystem, and an operation management monitoring subsystem;

[0164] The temperature monitoring subsystem includes multiple temperature sensors to monitor the temperature of preset equipment in the refrigeration system and cold chain storage;

[0165] The energy consumption monitoring subsystem includes smart electricity meters and smart oil meters, which are used to monitor the energy consumption and current data of the compressor unit, condenser, and air cooler in the refrigeration system in real time;

[0166] Refrigeration monitoring subsystem, used to monitor the operating time and equipment status of each device in the refrigeration system;

[0167] The operation management monitoring subsystem is used to monitor the opening and closing status and opening and closing time of the warehouse doors.

[0168] The energy-saving control device of the cold chain storage refrigeration system starts the refrigeration system at a preset time through the control module, and starts the automatic air separator to discharge non-condensable gases, so that the refrigeration capacity can be increased and the power consumption can be reduced. In addition, the current working stage of the refrigeration system is determined by the determination module, and the operating parameters of the current working stage monitored in the monitoring system are obtained; the control module compares the operating parameters with the preset threshold value, and the preset threshold value is the parameter limit corresponding to the energy saving standard corresponding to the current working stage in the refrigeration system; and if the operating parameters do not match the preset threshold value, a warning is issued so that maintenance personnel can adjust the corresponding equipment parameters in the current working stage. The embodiment of the present invention analyzes the factors affecting energy consumption based on the monitoring data of each working stage and determines the corresponding threshold value, so that energy-saving adjustments and management can be carried out for each working stage in the refrigeration system in a targeted manner, forming a set of comprehensive energy-saving management and control methods to achieve comprehensive energy-saving effects on the cold chain storage refrigeration system of fresh products.

[0169] An embodiment of the present invention provides a controller, Figure 7 is a schematic diagram of a controller provided by an embodiment of the present invention. Figure 7 As shown, the controller 7 of this embodiment includes: a processor 70, a memory 71, and a computer program 72 stored in the memory 71 and executable on the processor 70. When the processor 70 executes the computer program 72, the steps in the above-mentioned energy-saving control method embodiments of the cold chain storage refrigeration system are implemented, for example Figure 1 Alternatively, when the processor 70 executes the computer program 72, the functions of each module / unit in the above-mentioned device embodiments are realized, for example, Figure 6 The functions of each module / unit are shown.

[0170] Exemplarily, the computer program 72 may be divided into one or more modules / units, which are stored in the memory 71 and executed by the processor 70 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program 72 in the controller 7. For example, the computer program 72 may be divided into Figure 6 The modules / units shown.

[0171] The controller 7 may include, but is not limited to, a processor 70 and a memory 71. Those skilled in the art will appreciate that Figure 7 It is only an example of the controller 7 and does not constitute a limitation of the controller 7. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the controller may also include input and output devices, network access devices, buses, etc.

[0172] The processor 70 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0173] The memory 71 may be an internal storage unit of the controller 7, such as a hard disk or memory of the controller 7. The memory 71 may also be an external storage device of the controller 7, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the controller 7. Further, the memory 71 may include both an internal storage unit of the controller 7 and an external storage device. The memory 71 is used to store the computer program and other programs and data required by the controller. The memory 71 may also be used to temporarily store data that has been output or is to be output.

[0174] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0175] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0176] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0177] In the embodiments provided by the present invention, it should be understood that the disclosed devices / controllers and methods can be implemented in other ways. For example, the device / controller embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0178] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0179] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0180] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the energy-saving control method embodiments of the above-mentioned cold chain storage refrigeration system can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium.

[0181] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An energy-saving control method for a cold chain storage refrigeration system, characterized in that: include: Start the refrigeration system at the preset time and open the automatic air separator to discharge non-condensable gases; Determine the current working stage of the refrigeration system, and obtain the operating parameters of the current working stage monitored by the monitoring system; Comparing the operating parameter with a preset threshold, the preset threshold being a parameter limit corresponding to when energy saving in the current working stage of the refrigeration system reaches a standard; If the operating parameters do not match the preset thresholds, a warning is issued so that maintenance personnel can adjust the corresponding equipment parameters in the current working stage; Before starting the refrigeration system at the preset time and starting the automatic air separator to discharge the non-condensable gas, the method further includes: Determining preset thresholds corresponding to the compression stage, the condensation stage, and the evaporation stage of the refrigeration system; Wherein, determining the preset threshold value corresponding to the refrigeration system in the evaporation stage includes: The thermal resistance of the evaporator tube caused by the frost layer is taken as the maximum thermal resistance; According to the size of the warehouse door and the preset cooling loss value, determine the maximum time and maximum number of times the cold chain warehouse door can be opened.

2. The energy-saving control method for the cold chain storage refrigeration system according to claim 1 is characterized in that: Determining a preset threshold corresponding to the refrigeration system in the compression phase includes: According to the suction temperature of the compressor, determine the corresponding condensing temperature and evaporating temperature when the compressor reaches the energy saving standard; Determine the power and quantity of the compressors according to the cold chain storage area and the cooling load per unit area, and determine the type of compressor to be turned on according to the amount of goods, the compressor types include single-stage compressors and two-stage compressors; When the cylinder wall of the compressor is in a frosted state, the current opening of the liquid supply valve of the compressor is used as the maximum opening of the liquid supply valve; Based on the different oil levels of the compressor, a maximum oil level and a regular oil draining cycle corresponding to a minimum oil consumption are determined.

3. The energy-saving control method for the cold chain storage refrigeration system according to claim 2 is characterized in that: According to the suction temperature of the compressor, determine the corresponding condensing temperature and evaporating temperature when the compressor energy saving standard is met, including: Keeping the suction temperature of the compressor unchanged, determining the power consumption per unit refrigeration capacity corresponding to different condensing temperatures; According to the unit cooling power consumption corresponding to different condensing temperatures, determine the condensing temperature corresponding to the minimum unit cooling power consumption; Keeping the condensing temperature of the compressor unchanged, determining the unit shaft power refrigeration capacity corresponding to different evaporation temperatures; According to the unit shaft power cooling capacity corresponding to different evaporating temperatures, the evaporating temperature corresponding to the highest unit shaft power cooling capacity is determined.

4. The energy-saving control method for the cold chain storage refrigeration system according to claim 2 is characterized in that: Based on different oil level heights of the compressor, determining the oil level height corresponding to the minimum oil consumption and the periodic oil draining cycle includes: Determine the corresponding oil consumption based on different oil level heights of the compressor, and monitor the thickness of the oil film on the pipe wall of the refrigeration system when the compressor is running; According to the obtained fuel consumption, determine the maximum fuel level height corresponding to the minimum fuel consumption; Determine the time it takes for the oil film thickness to reach a preset thickness from zero, and set this time as the regular oil drain cycle.

5. The energy-saving control method for the cold chain storage refrigeration system according to claim 1 is characterized in that: Determining a preset threshold corresponding to the refrigeration system in the condensing stage includes: Determine the venting point of the non-condensable gas, monitor the exhaust pressure and exhaust temperature of the refrigeration system, and determine the cycle of venting the non-condensable gas according to the exhaust pressure and the exhaust temperature; Monitor the scale thickness and heat transfer coefficient of the condenser to determine the maximum scale thickness corresponding to the decrease of the heat transfer coefficient of the condenser; The pressure of the pressure equalizing pipe of the condenser and the liquid output of the liquid outlet pipe of the condenser are monitored to determine the maximum pressure and the maximum liquid output at which the condenser does not accumulate liquid.

6. The energy-saving control method for the cold chain storage refrigeration system according to claim 1 is characterized in that: The monitoring system includes a temperature monitoring subsystem, an energy consumption monitoring subsystem, a refrigeration monitoring subsystem and an operation management monitoring subsystem; The temperature monitoring subsystem includes a plurality of temperature sensors for monitoring the temperature of preset equipment and cold chain storage in the refrigeration system; The energy consumption monitoring subsystem includes a smart electricity meter and a smart oil meter, which are used to monitor the energy consumption and current data of the compressor unit, condenser and air cooler in the refrigeration system in real time; The refrigeration monitoring subsystem is used to monitor the operating time and equipment status of each device in the refrigeration system; The operation management monitoring subsystem is used to monitor the opening and closing status and opening and closing time of the warehouse door.

7. An energy-saving control device for a cold chain storage refrigeration system, characterized in that: include: A control module, used to start the refrigeration system at a preset time and start the automatic air separator to discharge non-condensable gas; A determination module, used to determine the current working stage of the refrigeration system and obtain the operating parameters of the current working stage monitored by the monitoring system; The control module is further used to compare the operating parameter with a preset threshold value, where the preset threshold value is a parameter limit value corresponding to the energy saving standard corresponding to the current working stage of the refrigeration system; The control module is further configured to issue a warning if the operating parameter does not match the preset threshold value, so that maintenance personnel can adjust the corresponding equipment parameters in the current working stage; The determination module is further used to determine the preset thresholds corresponding to the compression stage, the condensation stage and the evaporation stage of the refrigeration system; The determination module is also used to take the thermal resistance of the evaporator tube of the evaporator due to the frost layer as the maximum thermal resistance; and determine the maximum time and maximum number of times to open the cold chain warehouse door according to the size of the warehouse door and the preset cooling loss value.

8. A controller comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, characterized in that: When the processor executes the computer program, the steps of the energy-saving control method for the cold chain storage refrigeration system as described in any one of claims 1 to 6 are implemented.

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