1996 results about "Defrosting" patented technology

The invention provides an intelligent adjusting and dynamic defrosting method and system based on multiple sensors and a medium The method comprises the steps that firstly, monitoring data are obtained in real time according to the multi-dimensional sensors deployed in a freezer, and a multi-source data matrix is obtained through preset data processing and integration; secondly, dynamically adjusting a frost condition model weight coefficient according to monitoring data, and quantifying a frost condition coefficient based on a frost condition model in combination with a multi-source data matrix; then, executing a three-stage defrosting strategy according to the frost condition coefficient, and respectively adjusting working parameters of defrosting equipment such as a compressor, a condensation fan or a heater; and finally, precise control over the box temperature is achieved through power step soft start of a compressor and PID dynamic adjustment of an electronic expansion valve, and energy efficiency optimization is achieved by automatically optimizing the rotating speed of a condensation fan based on the environment temperature and humidity. The corresponding defrosting operation is triggered through the frost condition coefficient, and the effectiveness of defrosting and the stability of the box temperature are improved; in addition, the adaptability of special scenes is enhanced by dynamically adjusting the weight.

The invention provides an air source heat pump heating method and system, and relates to the technical field of heat pump system thermal control, and the method comprises the steps: collecting evaporator surface frost layer thickness, environment temperature and humidity parameters in real time, inputting the parameters to a pre-trained neural network algorithm model, and identifying a frosting rate by analyzing a multi-factor nonlinear relation; predicting a future frosting development trend, and outputting frosting thickness increase prediction and severity degree results; and according to the frosting thickness increase prediction and the severity degree result, reverse circulation defrosting is started in advance when the frost layer does not reach the critical thickness, and optimal control over the defrosting process is achieved by adjusting the opening degree of the four-way valve and the rotating speed of the draught fan, so that the system state after defrosting is obtained. The energy efficiency of the system is improved, and the heating comfort is optimized.

The invention provides a constant-heating defrosting system of a heat recovery air conditioner and a defrosting control method and device. According to the system, a compressor, a first electromagnetic valve, a water tank, a first expansion valve, a first one-way valve, a second electromagnetic valve, an outdoor heat exchanger and a four-way valve are connected to form a first heating loop; a compressor, a first electromagnetic valve, a water tank, a first expansion valve, a first one-way valve, a third electromagnetic valve, an energy storage water tank, a fourth electromagnetic valve and a four-way valve are connected to form a first defrosting loop. A compressor, a fifth electromagnetic valve, a second one-way valve, an outdoor heat exchanger and a four-way valve are connected to form a second defrosting loop; and the first heating loop, the first defrosting loop and the second defrosting loop form a single heating water defrosting loop. The problem that in the prior art, in the defrosting process, the comfort experience of a user is affected due to the fact that an air conditioner does not conduct heating is solved.

The invention discloses a refrigerator defrosting control method based on BP (Back Propagation) neural network and fuzzy control coupling, which is characterized by comprising the following steps: realizing deep perception of dynamic characteristics of a refrigerating system through data-driven modeling: learning actual data signals of a compressor and an evaporator by the BP neural network, and indirectly estimating recessive parameters such as refrigerant charge and frost layer form distribution; and the fuzzy controller dynamically adjusts a defrosting strategy according to a neural network prediction result, and collaborative optimization of refrigeration cycle parameters and the frosting process is achieved. Environment parameters are learned online through a neural network, and the fuzzy rule base is optimized in real time; the neural network directly maps bottom layer physical characteristics such as a compressor operation mode and evaporator structure parameters, and outputs a dynamic compensation signal; and the model is continuously iterated by accumulating historical data to adapt to regional / seasonal differences.

The invention discloses a defrosting control method and device, refrigeration equipment and a storage medium, and belongs to the technical field of defrosting. According to the defrosting control method, in the first stage, the heater is controlled to defrost the evaporator; entering a second stage when the defrosting state of the first stage meets a first condition; and in the second stage, a compressor exhaust pipe of the refrigerating system is controlled to communicate with the evaporator to conduct hot gas defrosting, and when hot gas defrosting is conducted under the first condition, the heat exchange medium flowing out of the evaporator is in a gaseous state. According to the defrosting control method disclosed by the invention, the heater is firstly controlled to defrost, and then the compressor is controlled to defrost by hot gas, so that staged defrosting is realized; the defrosting state of the first stage is controlled, so that the surface temperature of the evaporator is not too low when hot gas defrosting is carried out, heat exchange media flowing out of the evaporator are prevented from being liquefied, and liquid impact is prevented; and meanwhile, the heater is turned off in the second stage, and excessive heat generated by the heater can be prevented from overflowing to the compartment.

The invention relates to the technical field of air conditioners, in particular to a defrosting system and method of a finned heat exchanger and an air conditioner outdoor unit. The defrosting system of the finned heat exchanger comprises a fan parameter monitoring module, a defrosting module and a control module, wherein the fan parameter monitoring module is configured to monitor the power variation of a fan in real time; and the data processing module is configured to analyze the power variation of the fan so as to judge whether the finned heat exchanger is frosted or not and perform defrosting operation. According to the scheme, the defect that it is difficult to accurately predict and respond to the actual frosting condition when an air conditioning system judges the frosting opportunity in the related technology is overcome, the frosting condition is accurately judged, the mistaken defrosting operation process is reduced, and then defrosting is conducted in time.

The invention provides a refrigeration house multi-fan intelligent cooperative defrosting control system and method. The refrigeration house multi-fan intelligent cooperative defrosting control system comprises an air-cooled condenser, a throttling valve, a compressor, a refrigerating chamber, a bypass valve, an air speed sensor, a temperature and humidity sensor, a temperature sensor, a pressure sensor, a flow meter, an air cooler tail end evaporator, data acquisition equipment, a central processing unit and a control output port. According to the cold storage scene that hot gas bypass defrosting is adopted, and one refrigerating unit is provided with a plurality of air coolers, the ratio (COP) of the accumulated refrigerating capacity to the total energy consumption in the operation period of each air cooler is calculated. And a comprehensive performance coefficient dynamic model of the air cooler is constructed by combining the temperature difference between the air supply and the air return, so that optimal energy efficiency of the air cooler and multi-fan defrosting control are realized. Compared with the prior art, the defrosting control logic is reconstructed from the perspective of the performance coefficient of the air cooler, the frosting condition of the surface of the evaporator at the tail end of the multiple fans of the refrigeration house can be accurately judged, it is ensured that the unit maintains high efficiency in the operation process, and development of the efficient and energy-saving control technology of a refrigeration house refrigerating system is facilitated.

The invention relates to the technical field of air conditioners, particularly provides an air conditioning system and a control method thereof, and aims to solve the problems that condensation is easily generated and the temperature is too high to facilitate heat dissipation in an existing refrigerant heat dissipation mode. In order to achieve the purpose, the air conditioning system comprises an outdoor heat exchanger, a control valve, a refrigerant radiator, a throttling element and an indoor heat exchanger which are sequentially connected. The refrigerant radiator is used for radiating a driving module of the air conditioning system; the air conditioning system further comprises a first temperature detection piece which is arranged on the side, close to the control valve, of the refrigerant radiator and used for detecting the temperature of the refrigerant flowing to the refrigerant radiator or flowing out of the refrigerant radiator. The opening degree of the control valve is adjusted in the refrigeration mode, the opening degree of the throttling element is adjusted in the heating mode, and the temperature of the throttling element and the control valve is controlled in the defrosting mode, so that the temperature is higher than the dew point temperature and lower than the temperature of the driving module; therefore, the driving module can be cooled, and condensation can be avoided.

The embodiment of the invention discloses a defrosting control method and device, an air conditioner and a computer readable storage medium, and relates to the technical field of air conditioners. The defrosting control method comprises the steps that the current of a draught fan is obtained; acquiring a plurality of current characteristics of the current; acquiring environment temperature and environment humidity; determining a dynamic current threshold according to the environment temperature and the environment humidity; based on the multiple current characteristics, the environment temperature, the environment humidity and the dynamic current threshold value, the frosting probability is determined; and when the frosting probability is larger than a frosting probability threshold value, defrosting control is carried out. Therefore, according to the scheme, whether frosting occurs or not can be accurately judged, and accurate defrosting control is achieved.

The invention relates to the technical field of heat pump units, in particular to a swimming pool heat pump unit with a self-adaptive defrosting function, which comprises a case body, a compressor, a condenser and a fin heat exchanger are arranged in the case body, the swimming pool heat pump unit further comprises a spray pipe, a defrosting water pump and a water pan, and the spray pipe is used for spraying water to the surface of the fin heat exchanger; the water inlet end of the defrosting water pump is connected with a water outlet of the condenser, and the water outlet end of the defrosting water pump is connected with the spraying pipe through a pipeline. The water pan is arranged below the fin type heat exchanger, and the bottom of the water pan is connected with a water inlet of the condenser through a pipeline. Water heated by the condenser is guided to the spraying pipe, then warm water is sprayed to the fin type heat exchanger through the spraying pipe to achieve defrosting, manual intervention is not needed, heat sources can be saved, and the low-power-consumption defrosting effect is achieved.

The invention discloses an intelligent heating method and system for a rear air window and a rearview mirror, a controller and a storage medium. The method comprises the following steps: acquiring real-time environment data at least comprising environment temperature and environment humidity; determining a basic heating duration based on the environment temperature through a first control logic; compensating and correcting the basic heating duration based on the environment humidity through a second control logic so as to generate a target heating duration; and finally, controlling the heating device to operate according to the target heating duration. The method further comprises a cooperative control scheme of switching to a degradation control mode based on preset configuration parameters when sensor data are invalid and adjusting heating duration based on data acquired from the ADAS in severe weather. Through multi-parameter fusion and hierarchical cooperative control, accurate matching of heating requirements is achieved, and the defrosting efficiency, the energy saving performance and the system reliability are remarkably improved.

The invention discloses a defrosting control method and system based on the COP attenuation rate, an air conditioner and a medium. The method comprises the steps that the rotating speed of an indoor fan, the temperature of an indoor coil pipe and consumption power are collected; according to the rotating speed of the indoor draught fan, the temperature of the indoor coil pipe and the consumption power, a COP mean value and a COP maximum value are obtained through calculation; according to the COP mean value and the COP maximum value, calculating to obtain a COP attenuation rate; and according to the COP attenuation rate, the air conditioner is controlled to enter a first-stage frost restraining mode, a second-stage frost restraining mode or a reversing defrosting mode. The defrosting opportunity can be accurately determined, the problem that hysteresis exists in defrosting and the comfort degree of a user is affected is solved, and the method can be widely applied to the technical field of air conditioners.

The invention discloses a control method for defrosting of a parallel flow evaporator, which comprises the following steps of: constructing a multi-dimensional state sensing network, constructing a three-dimensional state sensing matrix by utilizing a distributed temperature sensor array on the surface of an evaporator coil, an air inlet humidity sensor and an inlet and outlet differential pressure type pressure sensor, and acquiring information such as temperature distribution, environment humidity and air pressure difference; through dynamic threshold self-adaptive judgment, based on an environment temperature field, the historical temperature of an evaporator and an icing critical temperature field calculated by a time sequence prediction model, the defrosting triggering condition is judged by combining humidity and an air pressure difference change gradient field; gradient type energy injection defrosting is adopted, in the first-stage defrosting process, the refrigerant flow is adjusted through a proportional electromagnetic valve to conduct directional defrosting, and in the second-stage defrosting process, a compressor is closed, a fin gap shape memory alloy heating network is activated, and latent heat of a phase change material is released to conduct uniform defrosting. And performing multi-physical field cooperative regulation and control, constructing a coupling model, and adjusting the heating power and pulse modulation duty ratio sequence.

The invention discloses an air cooler distributed dynamic defrosting control method, and relates to the technical field of air cooler distributed defrosting, and the method comprises the following steps: obtaining the spatial position and wind direction and flow direction information of an air cooler in a refrigeration environment and the defrosting exhaust state of an adjacent air cooler, building a heat exchange state space-time perception map based on a space coordinate relation, and obtaining a heat exchange state space-time perception map; the determination module is used for determining whether the air cooler is interfered by defrosting airflow of adjacent air coolers; acquiring temperature, humidity, current and air volume data of the air coolers which are determined to be interfered by defrosting airflow of the adjacent air coolers, constructing a heat exchange characteristic curve of the target air cooler in the current time period, and performing residual error fitting calculation on the heat exchange characteristic curve and a standard heat exchange curve in a historical non-defrosting state; and determining the local heat exchange parameter distortion performance of the air cooler caused by the defrosting airflow interference of the adjacent air cooler. The problem that defrosting is triggered by mistake due to the fact that the air cooler is interfered by defrosting airflow is solved, and accurate recognition and dynamic control optimization of the defrosting requirement are achieved.

The utility model discloses a refrigeration house defrosting system which comprises a refrigeration house body and a dehumidification device, the dehumidification device is provided with a dehumidification rotating wheel, the dehumidification rotating wheel is provided with a processing area and a regeneration area, and the dehumidification device reduces internal moisture of the refrigeration house body through the dehumidification rotating wheel and removes internal frost of the refrigeration house body. Wherein the dehumidification device is provided with a treatment air inlet and a treatment air outlet, the treatment air inlet can extract gas to be treated from the interior of the refrigeration house body, and the treatment air outlet can convey dry gas adsorbed and dehumidified by the dehumidification rotating wheel to the refrigeration house body again. According to the refrigeration house defrosting system, no condensate water is generated in the whole dehumidification process of the refrigeration house, water does not need to be drained in the refrigeration house, the problem that cold water generated due to the fact that electric defrosting, hot fluorine defrosting and other defrosting modes are used is inconvenient to drain is solved, the residual cold water in the refrigeration house is not completely drained and can be condensed again, and the dehumidification and defrosting effects of the refrigeration house are not thorough; no obvious temperature fluctuation exists in the refrigeration house in the operation process of the refrigeration house defrosting system.

A refrigerator may include: a storage compartment; a cooling sink (CS); a thermoelectric element including a cooling layer contacting the CS, the thermoelectric element configured to, based on a voltage pulse applied to the thermoelectric element, cool the cooling layer and thereby cool the CS; a fan controllable to generate an airflow to be cooled by the CS; a cooling duct covering the CS and fan, and configured to guide the airflow from the storage compartment to the CS and to accommodate defrost water generated by water, frozen by the CS, being defrosted; a temperature sensor to detect a temperature of the CS; and a processor configured to: control the cooling fan to evaporate the defrost water, and perform an anti-freezing control so that the defrost water does not freeze, the anti-freezing control including adjusting a duty ratio of the voltage pulse based on the detected temperature of the CS.

The invention provides a self-cleaning control method and device for an air conditioner, a storage medium and a program product, and the method comprises the steps that after the air conditioner enters a sleep mode, the air conditioner is controlled to enter a refrigeration condensation stage, so that condensation is formed on the surface of an indoor heat exchanger of the air conditioner; when the current moment reaches the preset moment and the temperature difference value between the indoor environment temperature and the set temperature of the air conditioner is smaller than or equal to a preset temperature difference threshold value, the air conditioner is controlled to enter a refrigeration frosting stage; and when it is detected that the temperature of the indoor heat exchanger meets the preset defrosting execution condition, a defrosting stage is started, non-reversing defrosting is conducted by controlling the rotating speed of an inner fan, the frequency of a compressor, the opening degree of a throttling device and the rotating speed of an outer fan, and self-cleaning of the air conditioner is achieved. According to the scheme provided by the invention, air conditioner self-cleaning can be carried out without specially consuming time.

The present invention provides an outdoor unit of a heat pump unit, comprising: a fin heat exchanger, including a left end plate, a right end plate and fins, wherein a first heat exchange component and a second heat exchange component are sequentially arranged in the fins from top to bottom, the first heat exchange component includes m first heat exchange copper tubes stacked from top to bottom, and the second heat exchange component includes n second heat exchange copper tubes stacked from top to bottom; a gas collecting pipe, and the first ends of the m first heat exchange copper tubes and the n second heat exchange copper tubes are all connected to the gas collecting pipe; a liquid separation component, including a first liquid separation pipe, a second liquid separation pipe and a first one-way valve, the second liquid separation pipe is connected to the first liquid separation pipe through the first one-way valve, and the flow direction of the first one-way valve is from the second liquid separation pipe to the first liquid separation pipe; the first liquid separation pipe includes a brass distributor, the brass distributor is connected to the second ends of the m first heat exchange copper tubes and the second liquid separation pipe through pipelines, and the second liquid separation pipe is connected to the second ends of the n second heat exchange copper tubes through pipelines, and it has good defrosting effect.

The invention provides a defrosting control method based on near-end strategy optimization and a refrigerator. The method comprises the steps that target data of the refrigerator are collected; processing the collected target data, judging whether missing values and abnormal values exist in the data or not, and respectively processing the missing values and the abnormal values; constructing a state space of the multivariable strategy network based on the preprocessed data; meanwhile, energy consumption, freezing chamber temperature fluctuation, compressor starting and stopping times, defrosting interval time and defrosting duration are calculated based on the preprocessed data, and a multi-target reward function is constructed; training the constructed strategy network by using a near-end strategy optimization algorithm; and the trained lightweight strategy network model is embedded into an equipment end control device, and a defrosting control scheme is output. The near-end strategy optimization method of deep reinforcement learning is applied to refrigerator defrosting decision making, the defrosting opportunity is dynamically decided through the deep reinforcement learning strategy network, comprehensive optimization of energy consumption and temperature stability is achieved, energy consumption is reduced, temperature fluctuation is reduced, and the service life of a compressor is prolonged.

The invention discloses a refrigeration house refrigerating system, a defrosting control method and device of the refrigeration house refrigerating system and a storage medium. The system comprises a medium-temperature heat accumulator filled with a first phase change material; the low-temperature heat accumulator is connected with the medium-temperature heat accumulator and is internally filled with a second phase-change material of which the phase-change temperature is lower than that of the first phase-change material; an air cooler; the evaporator is respectively connected with the air cooler and the low-temperature heat accumulator through a throttle valve; the defrosting heater abuts against the surface of the evaporator and is connected with the medium-temperature heat accumulator and the low-temperature heat accumulator; one end of the compressor is connected with a heat exchange pipeline of the medium-temperature heat accumulator and the air cooler through a three-way reversing valve, the other end of the compressor is connected with the evaporator, and the low-temperature heat accumulator, the medium-temperature heat accumulator, the solution pump and the defrosting heater sequentially form a loop. By means of the two heat accumulators made of the phase change materials with different phase change temperatures, wide-temperature-range exhaust waste heat of the compressor is absorbed, meanwhile, the evaporator is defrosted in a graded mode through the two stages of heat accumulators, and the energy consumption of the system is reduced.

The present invention relates to the field of agricultural product preservation technology, which discloses a flexible air duct precision temperature control system and its control method. The temperature control system refrigeration component includes a flexible air duct component connected to the top of a cold storage through an air cooler, the flexible air duct component includes a flexible air duct, and a plurality of cold storage plates are arranged in different areas in the flexible air duct; a sensor component is used to collect temperature signals and pressure difference signals in the cold storage and the refrigeration component; a controller controls the refrigeration component to process the cold storage plates in three working modes: refrigeration, cold storage and defrosting, and improves the temperature uniformity of the cold storage through the flexible air duct component and the cold storage plates, and reduces the temperature fluctuation in the cold storage during defrosting. The present invention uses flexible air ducts and cold storage plates to improve the temperature uniformity of the cold storage; adopts two exchangers, the air cooler and the cold storage plate, and controls the cold capacity in the cold storage plates when the refrigeration equipment defrosts, so as to significantly reduce the temperature fluctuation in the storage during defrosting.

The invention relates to the field of control methods, in particular to an operation control method and electronic equipment based on air source heat pump load rate optimization, and the control method comprises the following steps: calculating and judging whether the obtained heat pump unit load rate Li is less than or equal to 1; the unit energy efficiency COPLi in the frostless state is calculated; whether the evaporation temperature Tei meets the Tilt or not is judged; td, Tilt, Td, Tilt; 0; calculating a defrosting correction coefficient Fi, wherein Fi = (Qi-Qd) / Wi / COPLi; calculating and recording the comprehensive energy efficiency COPci of the heat pump unit, wherein COPci = COPLi * Fi; whether i is equal to the maximum number n of the units is judged, the maximum value is selected according to the multiple COPci obtained through program loop calculation, and therefore the optimal starting number of the system is determined. The number of started units is subjected to loop iteration, and the influence of unit load rates and frosting on energy efficiency under the condition of different numbers of started units is calculated, so that a more accurate comprehensive energy efficiency calculation result is obtained. The optimal number of started units is determined by comparing the maximum values of the comprehensive energy efficiency of the units under the condition of different numbers of started units, so that the comprehensive energy efficiency of the units can be remarkably improved, and the purpose of saving energy is achieved.

The invention discloses a self-control maintenance method and system for an intelligent clean air conditioner, and belongs to the technical field of clean air conditioners. According to the method, a multi-source heterogeneous data sensing layer is constructed to collect fan bearing vibration data, filter monitoring data and surface air cooler monitoring data; and constructing a fault prediction model according to the fan bearing vibration data, adopting a machine to learn vibration spectrum time-varying characteristics, predicting the residual life of the fan bearing, and performing self-control maintenance. A filter blockage dynamic model is further constructed according to filter monitoring data, maintenance and air volume compensation are carried out according to the blockage condition and the service life of a bearing, meanwhile, the frosting condition of a surface air cooler is monitored, hot gas bypass defrosting is carried out in time, the clean air conditioner can find and process potential faults in time, and the stability of the system is improved; the intelligent self-control maintenance greatly reduces the frequency and cost of manual maintenance, and improves the management efficiency of the equipment at the same time.

The invention discloses a loading lap joint device for cold chain transportation and sorting and a using method thereof, and relates to the technical field of cold chain transportation, the loading lap joint device comprises a drawing cold storage module, a cold storage module, a cold storage module, a cold storage module, a cold storage module, a cold storage module and a cold storage module, the drawing cold storage module is slidably mounted on a sliding groove in the bottom of a cold chain vehicle compartment, and a cold storage cavity is formed in the drawing cold storage module; the linkage defrosting mechanism comprises a frame type defrosting scraping plate arranged above the drawing cold storage module, a frost collecting groove is formed in the side edge of the cold storage cavity, and scraped frost water is guided into the frost collecting groove through the defrosting scraping plate; the lap joint interface module is arranged at the front end of the drawing cold storage module and comprises a conveying plate and a temperature adjusting air curtain which are movably hinged, and the temperature adjusting air curtain communicates with the cold storage cavity and the frost collecting groove through an air duct and releases cold air; the control unit is used for monitoring the temperature in the compartment and the platform position and adjusting the air speed of the air curtain to control the cold air circulation amount. The system not only can automatically remove the frost layer in the carriage and effectively reduce the environment temperature during loading, but also can be flexibly butted with a sorting line, so that energy conservation, high efficiency and temperature control guarantee of a cold chain loading link are realized.

The invention provides a heat pump non-stop defrosting control method and system based on double-evaporator cooperative control, and the method comprises the steps: building a temperature difference response change rate index by collecting the refrigerant inlet and outlet temperatures of two groups of fin heat exchangers in real time, and recognizing a side needing to be defrosted and a heating side; an electronic expansion valve, a fan and an electromagnetic valve are dynamically configured, so that the side needing to be defrosted enters a static defrosting mode, and the heating side continuously supplies heat; the frequency rising of the compressor and the switching of the four-way valve are cooperatively adjusted, and small-flow pre-balancing is executed before reversing so as to restrain pressure impact; and after defrosting is completed, it is judged that defrosting is finished based on the thermal response state and the heat change trend, the side needing defrosting is controlled to be reset, and heating is started again. Uninterrupted heat supply of the user side in the defrosting process is achieved, water temperature fluctuation and energy consumption are remarkably reduced, and the operation stability and energy efficiency of the heat pump in the low-temperature and high-humidity environment are improved.

The invention discloses a heat pump heat storage defrosting control method which comprises the following steps: outdoor temperature acquisition: after starting to heat, performing data acquisition on the surface temperature of an outdoor heat exchanger at regular time; temperature deviation is calculated, specifically, temperature data sampled each time are set to be Tn, the temperature difference Tn = Tn-T0 during sampling each time is calculated, and the sampling frequency is t / time; calculating a temperature change rate: calculating a real-time temperature change rate according to the acquisition evaluation rate; frosting degree judgment, wherein the frosting degree is divided into mild frosting, moderate frosting or severe frosting according to the temperature difference and the temperature change rate; and according to the frosting degree, different strategies are adopted to adjust the opening degree of the main electronic expansion valve and the auxiliary electronic expansion valve, and a refrigerant is called to enter the outdoor heat exchanger for defrosting. The frosting degree is subdivided, and the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve are adjusted through different strategies, so that the situation that the indoor temperature is greatly reduced during mild frosting or moderate frosting is avoided.

The invention discloses a defrosting method, device and equipment for an outdoor heat exchanger of an air conditioner and a medium. According to the defrosting method for the outdoor heat exchanger of the air conditioner, the thickness of a frost layer is monitored in real time, when the thickness of the frost layer reaches a first preset threshold value, the defrosting control process is started, and the frosting rate is calculated. And according to the preset rate interval where the frosting rate is located, hot gas defrosting and reversing defrosting are dynamically selected. And when the thickness of the frost layer is reduced to a second preset threshold value, the defrosting process is ended. According to the method, a dynamic adjustment defrosting strategy is used, hot gas defrosting or reversing defrosting is flexibly selected according to the change of the frosting rate, operation of a long-time low-efficiency defrosting mode is avoided, and therefore energy waste generated when the air conditioner outdoor heat exchanger executes defrosting and defrosting is reduced.

The invention discloses an energy-saving type airflow cooperative control system of an impact type tunnel instant freezer and an optimization method. The system obtains multi-source data of materials, environment and equipment in real time through a data sensing and collecting module; the collaborative optimization decision module generates a global control instruction for coordinating the air supply subsystem, the refrigeration subsystem and the conveying subsystem based on an optimization model with the lowest total energy consumption of the system as a target; the airflow dynamic execution module and the refrigeration conveying cooperative execution module respectively drive the adjustable airflow generation unit, the refrigerating unit and the conveying chain to generate a dynamic airflow field matched with the freezing load and adjust the cooling capacity and the speed; the intelligent defrosting scheduling module optimally triggers defrosting based on the prediction model; according to the method, the steps of data collection, decision optimization, airflow dynamic adjustment, refrigeration conveying cooperation and intelligent defrosting are synchronously executed. According to the invention, deep collaboration and dynamic optimization of multiple subsystems are realized, the energy consumption of the instant freezer can be obviously reduced, and the freezing uniformity and the continuous production efficiency are improved.

The invention relates to the technical field of heat pump units, and discloses a self-adaptive defrosting and oil return cooperative control method and device of a heat pump unit and a computer storage medium. The method comprises the steps that the current outdoor heat exchanger coil temperature parameter of the heat pump unit in the defrosting operation state is obtained, and according to the current outdoor heat exchanger coil temperature parameter, the heat pump unit in the defrosting operation state is defrosted; judging whether the heat pump unit meets a defrosting exit condition or not; if yes, target operation parameters of a compressor of the heat pump unit are obtained, and whether the heat pump unit meets the oil return time condition or not is judged according to the target operation parameters; if yes, the heat pump unit is controlled to execute the defrosting quit operation, and after the defrosting quit operation is completed, the heat pump unit is controlled to return oil, in this way, the self-adaptive defrosting and oil return cooperative control process of the heat pump unit is achieved, the unnecessary working condition switching frequency of the heat pump unit is reduced, and the unit can operate continuously; and the indoor temperature fluctuation is reduced, and the oil gas recovery efficiency is improved, so that the operation energy efficiency and reliability of the heat pump unit are improved.

The invention relates to the technical field of heat pump control, and discloses a defrosting method and device of a heat pump system and the heat pump system.The defrosting method comprises the steps that the temperature and humidity of gaps of a fin type heat exchanger are monitored in real time; and when the temperature is lower than or equal to the threshold value of the dynamic dew point temperature plus the safety margin and the humidity is higher than or equal to the threshold value, it is judged that the frosting prevention condition is met, the gap temperature is increased by adjusting the refrigerant bypass valve, the gap humidity is reduced by adjusting the airflow adjusting valve, and therefore frosting is actively prevented. And if the frost layer appears, short-time refrigeration interruption or low-power heating is started for defrosting according to the thickness of the frost layer or a pressure difference signal. And the formed ice layer is forcibly removed by switching the flow direction of the refrigerant and heating. By means of three-level linkage control, accurate defrosting in the whole process from prevention to removal is achieved, energy waste is effectively avoided, the defrosting efficiency and operation stability of the system are improved, and the user experience is improved.