3423 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 utility model relates to the technical field of automatic defrosting, and provides an automatic defrosting mechanism of an air source heat pump, which comprises an air source heat pump body and a heat exchange evaporator, the heat exchange evaporator comprises a heat exchange fin, a defrosting pipe is fixedly mounted on the heat exchange fin, the air source heat pump body is communicated with a cold water pipe and a hot water pipe, and the cold water pipe is communicated with the hot water pipe. A heat preservation heating box is fixed to the outer wall of the air source heat pump body and communicated with a first water guide pipe, the first water guide pipe is communicated with one end of the defrosting pipe, the hot water pipe is further communicated with a water inlet pipe, the water inlet pipe is communicated with the heat preservation heating box, and the communication position is controlled by an electromagnetic control valve. The second water guide pipe communicates with a one-way water valve. The water inlet pipe is additionally arranged on the hot water pipe of the automatic defrosting mechanism of the air source heat pump and matched with the first water guide pipe, the defrosting pipe and the second water guide pipe, the heat exchange evaporator is defrosted, it is guaranteed that the heat exchange evaporator makes full contact with outside air, and the working efficiency of the heat exchange evaporator is not affected.

Disclosed is a method for defrosting a thermal regulation circuit for a vehicle, in particular for a motor vehicle, the thermal regulation circuit being provided with a refrigerant circulation loop comprising a first heat exchanger (2), susceptible to frosting, as well as second and third exchangers (4, 6), the second and third exchangers (4, 6) being intended to exchange heat between the refrigerant and a heat transfer fluid, the loop further comprising a bottle (12) for storing a part of the refrigerant, the method comprising a step, referred to as defrosting, of circulating the refrigerant successively in the second heat exchanger (4), the bottle (12) and then the first and third exchangers (2, 6), with cooling of the refrigerant in the first and second exchangers (2, 4) and heating of the refrigerant in the third exchanger (6).

A system for cooling aircraft components includes a compressor configured to receive air bled from a gas turbine engine and compress the received air. Additionally, the system includes a water separator configured to receive the compressed air from the compressor and remove moisture from the compressed air to dry the compressed air. Furthermore, the system includes a turbine configured to receive the dried air from the heat exchanger, with the dried air expanding as the dried air flows through the turbine. Moreover, the system includes a defroster configured to receive the expanded air from the turbine, with the defroster further configured to capture frozen particulate matter from the expanded air. As such, the moisture removed from the compressed air by the water separator is routed to the defroster to melt the captured frozen particulate matter.

The invention discloses a defrosting control device, a defrosting control method and a temperature regulation and control system. The defrosting control device comprises an acquisition module, an edge calculation module, a defrosting module and a control module, the defrosting module comprises a plurality of defrosting units arranged on the heat exchange unit; the acquisition module is used for acquiring air pressure difference of the heat exchange unit and temperature field distribution information of a set surface of the heat exchange unit; the edge calculation module is used for determining a critical defrosting threshold value and frost layer thickness distribution information of a set surface according to the wind pressure difference and the temperature field distribution information; the control module is used for determining a target defrosting area according to the frost layer thickness distribution information and the critical defrosting threshold value and controlling the defrosting unit corresponding to the target defrosting area to conduct defrosting. The invention provides a defrosting control device, a defrosting control method and a temperature regulation and control system, which can reduce the defrosting energy consumption, ensure the continuous work of the temperature regulation and control system where a heat exchange unit is located during defrosting, prolong the service life of the temperature regulation and control system and increase the application scene of the temperature regulation and control system.

The present invention provides a noise testing method for a compressor adapted to a refrigerator, which relates to the field of compressor testing. By designing a multi-mode testing link including initial power-on, standard steady state, quick freezing, defrosting and the like, the operating conditions of a refrigerator in its entire life cycle, including startup, stable operation, rapid refrigeration, defrosting and the like, as well as noise changes during conversions between different operating conditions, can be simulated, thereby greatly improving the ability to evaluate the noise performance of the refrigerator in actual use scenarios. On the basis of the multi-mode testing, combined with sound source analysis and resonance detection, it is possible to accurately distinguish whether the source of the noise problem is an abnormal sound source or other factors such as resonance. According to different root causes of the problem, measures such as adjusting the test scheme or the operating logic, optimizing the speed parameters and the like are adopted respectively, thereby effectively improving the pertinence and effectiveness of product optimization, and reducing the noise of the refrigerator in actual use.

The invention discloses a defrosting control method and system for an air source heat pump unit, and relates to the technical field of air source heat pumps. The frosting rate, the frosting thickness and the heat exchange efficiency reduction rate are calculated respectively, the frosting degree index is further calculated, a preset threshold value is compared, and whether the air source heat pump unit needs to be defrosted or not is judged; total defrosting heat is calculated, defrosting time is calculated based on the total defrosting heat, and then the temperature change rate of the outdoor heat exchanger is calculated; a defrosting effect index is calculated based on the outdoor heat exchanger temperature change rate; a preset threshold value is compared and whether defrosting is completed or not is judged; according to the method, the defrosting process can be monitored in real time and accurately controlled, and it is ensured that defrosting operation is timely, appropriate and efficient.

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 belongs to the technical field of refrigeration, and discloses an intelligent control method and system for small refrigeration equipment. On one hand, working condition parameters and operation parameters are monitored through various sensors, and a multi-dimensional database is established; establishing an agent model of the refrigeration equipment based on the multi-dimensional database, and performing intelligent matching control on the operation of a compressor and a fan in combination with real-time monitoring data; and on the other hand, a bid evaluation index of the period COPcyc is established to comprehensively measure energy loss in the refrigeration period and the defrosting period, the indicated defrosting amount is determined, and defrosting is started when the accumulated frosting amount reaches the indicated defrosting amount. On the basis that the refrigeration requirement of the refrigeration space is met, the temperature control precision in the refrigeration space is improved by optimizing part operation, inhibiting frost layer growth and starting defrosting according to needs, the operation energy consumption of the refrigeration equipment is reduced, and a new thought and method are provided for precise temperature control and energy conservation of the refrigeration equipment.

The invention relates to a defrosting refrigerating system and a refrigerator and a control method thereof, and belongs to the technical field of refrigerating systems.The defrosting refrigerating system comprises a compressor, a three-way pipe is connected to an outlet of the compressor, and the outlet of the compressor is connected to the first end of the three-way pipe; the condensation assembly inlet is connected to the second end of the three-way pipe; the throttling assembly inlet is connected to the condensation assembly outlet and comprises a first capillary tube and a second capillary tube which are connected in parallel. The first evaporator inlet is connected to the first capillary outlet, and the first evaporator is installed between the outer side of an inner container of the refrigerator and a foaming layer; the second evaporator is mounted in the box on the inner side of the refrigerator liner, an inlet of the second evaporator is simultaneously connected with an outlet of the second capillary and a third end of the three-way pipe, and an outlet of the first evaporator and an outlet of the second evaporator are combined and connected to an inlet end of the compressor; and a normally closed electromagnetic valve is also arranged between the second evaporator and the three-way pipe. According to the defrosting refrigerating system, the manufacturing cost and maintenance difficulty of the system can be reduced, and meanwhile the problem of high failure rate is avoided.

The invention discloses an air conditioner, a defrosting method of the air conditioner and a controller of the air conditioner, the air conditioner is provided with a bypass pipeline, an outdoor heat exchanger is divided into a plurality of sub heat exchangers, one end of the bypass pipeline is connected with an exhaust port of a compressor through a refrigerant main path, and the other end of the bypass pipeline is divided into a plurality of refrigerant branch paths correspondingly connected with the sub heat exchangers; under the defrosting working condition, by controlling the first throttling assembly in the bypass pipeline and selecting the different sub heat exchangers to communicate with the exhaust port of the compressor, all the sub heat exchangers can be defrosted in sequence, so that the defrosting area of the air conditioner in the defrosting process is reduced, and the defrosting efficiency of the air conditioner is improved. The method is beneficial for the compressor to build the exhaust pressure, so that the operation power of the compressor is improved, more defrosting heat can be supplied, the defrosting time is finally shortened, and efficient and rapid defrosting is achieved.

The invention discloses a solar energy-phase change heat storage collaborative parallel evaporator segmented defrosting system and method, and belongs to the technical field of air source heat pump defrosting and new energy utilization. Comprising evaporator sets (A / B) arranged in parallel, a compressor, a condenser, a four-way reversing valve, a solar heat collecting plate, an electromagnetic valve, a temperature sensor and a connecting pipeline. A phase change material interlayer is embedded in a finned tube of the evaporator set, the phase change material is connected with the solar heat collection plate through a circulation pipeline, the phase change material absorbs or releases a large amount of latent heat in the solid-liquid phase change process, and heat collected by the solar heat collection plate is stored in a high-density mode. When the evaporator is frosted, heat stored by the phase change material can be released directionally, and melting of a frost layer is accelerated. Through the synergistic effect of solar energy and phase change heat storage, the defrosting time is remarkably shortened, indoor temperature fluctuation caused by reverse circulation is reduced, meanwhile, the energy utilization rate is increased, the structure is simple, the cost is controllable, and the efficient defrosting requirement of the air source heat pump in the cold region is met.

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.

According to the refrigerator and the control method thereof, an air supply fan is arranged at the communicating position of an air return duct and an air supply duct, the air supply fan rotates reversely when the refrigerator starts defrosting, the air is blown from the air supply duct to the air return duct at the moment, and therefore hot air generated when a heater heats an evaporator cannot be blown to a storage chamber; and the refrigeration effect of the storage chamber in the defrosting stage is ensured. Besides, the air supply duct and the air return duct are each internally provided with a pressure sensor, whether the pressure is balanced or not is determined by detecting the pressure difference of the two air ducts, when the pressure difference is large, it is indicated that the pressure of the air return duct is large due to heating of the heater, at the moment, the pressure difference between the two air ducts is large, and therefore the reverse rotation speed needs to be increased; according to the embodiment, the reverse rotation speed of the air supply fan is adjusted according to the pressure difference, electric energy is saved, meanwhile, hot air generated when the heater heats the evaporator can be prevented from being blown to the storage chamber, and the refrigeration effect of the storage chamber in the defrosting stage is guaranteed.

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 embodiment of the invention provides a defrosting control method and device, an air conditioner and a computer readable storage medium. The defrosting control method comprises the steps that the frosting degree of an outdoor heat exchanger is determined; in response to determining that the outdoor heat exchanger is in the thin frost state, the air conditioner is controlled to enter a thin frost non-reversing defrosting mode; in response to determining that the outdoor heat exchanger is in the medium frost state, the air conditioner is controlled to enter a medium frost non-reversing defrosting mode; and in response to determining that the outdoor heat exchanger is in the heavy frost state, the air conditioner is controlled to enter a reverse circulation defrosting mode.

The utility model discloses a cascade heat pump system which comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a first compressor and a second compressor. The first heat exchanger is arranged in an outdoor environment and exchanges heat through an outdoor fan; the second heat exchanger comprises a first passage and a second passage and is used for heat exchange between a refrigerant in the first passage and a refrigerant in the second passage; the first compressor, the first heat exchanger and the first passage form a first cycle; the third heat exchanger exchanges heat with the liquid heat exchange medium; the second compressor, the second passage and the third heat exchanger form a second cycle; the fourth heat exchanger exchanges heat with the liquid heat exchange medium and forms a third cycle with the first heat exchanger and the first compressor; the first cycle and the second cycle are in linkage heating operation or the third cycle is in linkage operation; and the third cycle can be used for refrigerating or heating. According to the utility model, high-efficiency operation and high-efficiency defrosting of the system are realized when the compression ratio is medium and small, the power of an outdoor fan is not increased, and energy and cost are saved.

The invention is suitable for the technical field of refrigerators, and provides a refrigerator defrosting control method, system, equipment and device.The refrigerator defrosting control method comprises the steps that a linear regression model is built based on historical refrigerator external environment temperature and historical door opening frequency data, and temperature threshold data and frequency threshold data are obtained; a refrigerator early warning signal is obtained by monitoring the temperature change trend and the frequency change trend of the refrigerator in a unit time area in real time; based on the refrigerator early warning signal, the frosting speed in the refrigerator is calculated; dynamically adjusting defrosting parameters of the refrigerator through a dynamic adjustment algorithm; on the basis of the defrosting parameters, the defrosting program of the refrigerator is started, the operation data of the defrosting program is recorded, on the basis of the operation data, the dynamic adjustment algorithm is optimized, the defrosting control strategy is generated, the defrosting process is accurately controlled, unnecessary energy consumption and refrigerant waste are avoided, energy consumption and emission of the refrigerator can be reduced, and the refrigerating efficiency of the refrigerator is improved. Therefore, the use experience and satisfaction degree of the user are improved, and the operation burden and maintenance cost of the user are reduced.

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.

According to the air conditioner partition self-cleaning control method and the air conditioner, the windward side of an indoor heat exchanger is divided into a plurality of to-be-cleaned areas, and a wind shielding structure is used for shielding or exposing any to-be-cleaned area; in the subarea self-cleaning mode, executing m times of micro-frost rinsing process for any to-be-cleaned area; the micro-frost rinsing process comprises the following steps that refrigeration operation is conducted, a compressor operates, an outer fan rotates, an inner fan rotates, the opening degree of an electronic expansion valve is the set frosting opening degree, a wind shielding structure acts to shield a to-be-cleaned area, and the to-be-cleaned area starts to frost; when the frosting ending condition is met, the opening degree of the electronic expansion valve is increased to the set defrosting opening degree or / and the outer fan stops rotating or / and the air blocking structure acts to expose the to-be-cleaned area, and defrosting is started in the to-be-cleaned area; when the defrosting ending condition is met, it is judged that defrosting of the to-be-cleaned area is completed; the technical problem that in the prior art, the refrigeration requirement of a user cannot be met during self-cleaning of an indoor heat exchanger is solved.

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 machining method for an efficient defrosting fin heat exchanger of an air source heat pump. The machining method comprises the following steps that a machining system for the efficient defrosting fin heat exchanger of the air source heat pump is constructed; performing surface treatment on the fin type heat exchanger; preparing a hydrophobic coating on the surface of the fin heat exchanger; and a hydrophilic and hydrophobic spacing layer is arranged, and super-lubrication treatment is carried out. According to the technical scheme, the defrosting fins of the air source heat pump are subjected to surface coating machining, the hydrophilic and hydrophobic spacing layer is arranged on the surface of the fin heat exchanger, the super-lubricating solution covers the surface of the fin heat exchanger, and therefore the passive frost restraining performance of the heat exchanger is improved, and the defrosting duration of the heat exchanger is shortened; the air source heat pump defrosting fin surface coating machining process is safe, reliable, efficient and stable.

The invention provides a defrosting method and device of an air conditioner, a computer program product and an air conditioning system.The air conditioner comprises an outdoor unit, the outdoor unit comprises an outdoor heat exchanger and a plurality of heaters located on the outdoor heat exchanger, and the method comprises the steps that obtaining is conducted, specifically, the thicknesses of a plurality of frost layers are obtained in real time, the thicknesses of the frost layers are the thicknesses of the frost layers on the corresponding areas of the outdoor heat exchanger; in the first control step, under the condition that the thicknesses of all the frost layers are larger than or equal to a first threshold value, the air conditioner is controlled to enter a defrosting mode, and the defrosting mode is a mode that the air conditioner enters a refrigeration state and a fan does not work; and a second control step, under the condition that the thickness of part of the frost layer is larger than or equal to the first threshold value, the target heater is controlled to conduct defrosting, the target heater is a heater on the area corresponding to the thickness of the frost layer larger than or equal to the first threshold value, and the problem that in the prior art, the user experience is affected due to the fact that a defrosting mode is frequently entered is solved.

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.