4377 results about "Defrosting" patented technology

A system providing a real time display to the rear of a large vehicle having a normal blind spot to its rear has, as primary components, a display assembly mounted in close proximity to the driver for easy viewing by the driver, a camera assembly mounted at a top rear portion of the vehicle, and a control unit for controlling the several functions of the camera assembly including, but not limited to, focus the camera, changing the viewing angle, zooming in or out, turning on and off defogging / defrosting means, turning on and off wiper means, and raising and lowering a protective shield.

A waste heat recover system includes a mechanism for supplying power by use of a thermoelectric conversion unit, and a mechanism for utilizing heat released from the thermoelectric conversion unit. Heat released from the thermoelectric conversion unit is utilized for, for example, heating, defrosting, defogging, temperature keeping of fuel, temperature keeping of an internal combustion engine, and temperature keeping of a fuel cell. The waste heat recovery system is equipped in, for example, cars, incinerators, fuel cells, and industrial machinery.

The invention discloses an automatic cleaning treatment method and an automatic cleaning treatment system of an air-conditioning heat exchanger. The automatic cleaning treatment method comprises the following steps: after an air-conditioner is started, judging whether the starting condition of automatic cleaning treatment of the air-conditioning heat exchanger is met; if yes, starting the refrigerating mode of the air-conditioner to enable surface of the heat exchanger to frost, and judging whether frosting is finished; after the frosting is finished, controlling the refrigerating mode of the air-conditioner to turn off, starting the air supply mode, then, starting an indoor draught fan to enable frost on the surface of the indoor heat exchanger to melt to water, and judging whether defrosting is finished; and after the defrosting is finished, controlling the heating mode of the air-conditioner to start, drying the heat exchanger, and ending cleaning. According to the invention, the inner side heat exchanger frosts after the temperature is rapidly decreased and covers and wraps dust and germs during frosting, the dust and germs on the heat exchangers are rapidly discharged along with water flow of a large quantity of defrosting water generated during the defrosting process, and automatic cleaning is realized through redrying treatment.

The invention discloses a method for air conditioner defrosting, which comprises the following steps, first, a pipeline is added between an air discharge pipe of a compressor and an air inlet pipe of a condensator in advance, and a magnetic valve is arranged on the pipeline, second, the temperature of a coil pipe of the condensator and temperature of outdoor environment are detected, third, a defrosting operation is judged to be operated or not according to the temperature of the coil pipe of the condensator and the outdoor environment, if the defrosting operation is needed, the fourth step is executed, otherwise the second step is executed, fourth, the magnetic valve is controlled to open, the frequency of the compressor is controlled to reduce to a first predetermined value, a four-way change-over valve is controlled to change into a refrigerating operation, fifth, the compressor is controlled to make an indoor set convert up to a second predetermined value according to the first predetermined speed, sixth, the temperature of the condensator is judged to detect whether the temperature is satisfied for a condition of the defrosting withdrawal, if satisfied, the seventh step is operated, otherwise, the fifth step is operated, seventh, the magnetic valve is closed, the compressor is controlled to convert down to a third predetermined value according to the second predetermined speed, and the four-way change-over valve is controlled to change to a heat-producing operation. The invention provides a method for air conditioner defrosting, which solves the problem that the period of defrosting for an air conditioner is longer, and defrosting effect of the air conditioner is influenced.

The invention discloses a defrosting control method of an air conditioner. The control method comprises the following steps that environment temperature and the temperature of an outdoor heat exchanger outlet or the temperature of a super cooling section are obtained; whether the defrosting condition is met or not is judged according to the environment temperature and the temperature of the outdoor heat exchanger outlet or the temperature of the super cooling section; when the judgment result shows that the defrosting condition is met, the wind speed of an indoor fan is decelerated, an electronic expansion valve is controlled to be lowered to the first opening degree state, an outdoor fan is closed, a compressor is regulated to the defrosting frequency, after the preset time, and the first ascending speed is used for controlling the electronic expansion valve to be raised to the second opening degree state, wherein the opening degree value of the second opening degree state is greater than the opening value of the first opening degree state. The defrosting control method of the air conditioner has the advantages that the defrosting can be realized without stopping the compressor, the method is simple, and the reliability is high. The invention also provides the air conditioner.

The invention discloses an air conditioner and a defrosting method thereof. The defrosting method comprises the following steps: when the air conditioner runs in a heating mode and the outdoor environment temperature is smaller than a preset temperature, acquiring any one of the air pressure of an outdoor heat exchanger, the air speed of the outdoor heat exchanger, the current of an outdoor fan and the rotating speed of the outdoor fan; judging the frosting degree of the outdoor heat exchanger according to any one of the air pressure of the outdoor heat exchanger, the air speed of the outdoor heat exchanger, the current of the outdoor fan and the rotating speed of the outdoor fan; according to the frosting degree, controlling the air conditioner to perform defrosting by selecting a defrosting mode corresponding to the frosting degree. According to the method, a corresponding defrosting mode is selected for defrosting according to the frosting degree of the outdoor heat exchanger, so the aim of intelligent defrosting is realized, the defrosting frequency is reduced, the heating capability of the air conditioner is improved, and the user experience is improved.

The invention relates to an intelligent defrosting method of an air conditioner. The air conditioner judges whether one of the seven conditions is satisfied according to a series of integral elements such as indoor coil pipe temperature transducer variable quantity, environment temperature variable quantity, indoor wind velocity variable quantity, heat-production runtime accumulation quantity, and whether an outdoor fan and a compressor are overcurrent protected, to determine whether an outdoor set is defrosted or whether defrosting is needed or not, so that intelligent defrosting is performed without using an outdoor coil pipe temperature transducer. The outdoor coil pipe temperature transducer and related signal lines are saved on the base of traditional air conditioners. Intelligent defrosting can be performed without human interference and only operation according to a preset program is needed. Clean outdoor defrosting is provided, heat quantity is not affected, and international specified requirements are satisfied.

The invention discloses an air conditioner indoor / outdoor unit cleaning method. The method comprises the steps of: controlling a heat exchanger to be cleaned to enter a self-cleaning mode; adjusting the operation frequency of an air conditioner, the openness of a throttling device and the rotating speed of a fan corresponding to the heat exchanger to be cleaned, and controlling the evaporation temperature of the heat exchanger to be cleaned to keep in a preset range to condense the surface of the heat exchanger to be cleaned; condensing the heat exchanger to be cleaned by t1 time; detecting if the high / low pressure difference of the air conditioner reaches preset conditions; controlling a four-way valve to change the direction to perform the defrosting switching of indoor and outdoor heat exchangers when the high / low pressure difference of the air conditioner reaches the preset conditions; and adjusting air conditioner operation parameters when the high / low pressure difference of the air conditioner dose not reach the preset conditions, and then, controlling the four-way valve to change the direction to perform the defrosting switching of the indoor and outdoor heat exchangers when the high / low pressure difference of the air conditioner reaches the preset conditions. As the direction change of the four-way valve can be controlled through detecting if the high / low pressure difference of the air conditioner reaches the preset conditions, the higher shock on the compressor caused by excessive high / low pressure difference of the air conditioner can be prevented.

The invention provides an air conditioner defrosting control method and an air conditioner. The method comprises the following step: after the current defrosting operation period of the air conditioner finishes, calculating and determining the heating operation time and defrosting time of the air conditioner of the next period on the basis of the indoor coil pipe temperature drop rate: when the indoor coil pipe temperature drop rate is high, controlling the heating operation time of the air conditioner of the next period to be less than or equal to the heating operation time of the air conditioner of the current period, and controlling the defrosting time of the next period to be greater than the defrosting time of the current period; and when the indoor coil pipe temperature drop rate is low, controlling the heating operation time of the air conditioner of the next period to be greater than the heating operation time of the air conditioner of the current period, and controlling the defrosting time of the next period to be less than or equal to the defrosting time of the current period. The heating operation time and defrosting time of the air conditioner of the next period are adjusted on the basis of the indoor coil pipe temperature drop rate when the operation of the current period finishes, thereby implementing dynamic adjustment on the heating and defrosting, and solving the technical problem of unclean defrosting or false defrosting when the defrosting is controlled on the basis of the indoor coil pipe temperature.

The invention relates to a defrosting control system and a defrosting control method of a refrigerator. The system comprises a controller, a circulating fan, and a defrosting temperature sensor, a refrigerating chamber temperature sensor, a freezing chamber temperature sensor and an environmental temperature sensor connected with the controller, wherein the circulating fan is arranged beside a refrigerator evaporator; an air flue where the circulating fan is positioned is provided with a freezing chamber air inlet and a refrigerating chamber air inlet, and the air inlets are provided with a freezing chamber air inlet electric air door and a refrigerating chamber air inlet electric air door respectively; the air flue where the other side of the refrigerator evaporator corresponding to the circulating fan is positioned is provided with a freezing chamber return air port and a refrigerating chamber return air port; and the freezing chamber return air port is provided with a freezing chamber return air port electric air door. Refrigeration and defrosting are controlled by controlling the electric air doors of each air port and the circulating fan so as to save electrical energy, avoid generating continuous high temperature to affect the temperature of the refrigerator and reduce the energy consumption; and the refrigerator evaporator is defrosted through relative hot air of the refrigerating chamber by using the temperature difference between the refrigerating chamber and the refrigerator evaporator, so the energy utilization rate is high and the energy consumption is saved.

The invention provides an intelligent defrosting method for a frequency-conversion air conditioner. Whether the air conditioner enters a defrosting program or not is judged according to a series of comprehensive factors such as the ranges of the indoor coil temperature, the indoor environment temperature, the outdoor coil temperature and the outdoor environment temperature, differences of the corresponding temperatures and heating running duration and cumulative time, the defrosting exit condition is determined according to the factors such as the defrosting duration and the range of the outer machine coil temperature, and the technical problems that in the prior art, the defrosting condition is simply set, and consequently the phenomena that defrosting is wrongly conducted when frost does not exist, defrosting is frequently conducted when frost is thin, and defrosting is not conducted when frost is thick possibly happen, and the heating effect of the air conditioner is affected can be solved. According to the intelligent defrosting method for the frequency-conversion air conditioner, the intelligent degree of defrosting of the air conditioner can be improved, the effects that defrosting is conducted when frost exists, defrosting is not conducted when frost does not exist, defrosting begins when frosting reaches a certain degree, and defrosting of an outdoor unit is thorough and timely can be improved, the accurate defrosting efficiency of the air conditioner can be effectively improved, and the heating performance of the air conditioner is improved.

The invention relates to the field of refrigeration defrosting of refrigerators, in particular to a defrosting system and a refrigerator with the defrosting system. The defrosting system comprises an evaporator body and a precooling evaporator, wherein the precooling evaporator is arranged at the bottom of the evaporator body and is used for cooling and dehumidifying high-temperature high-humidity air returning from a return air inlet. One end of the precooling evaporator is communicated with the return air inlet. The other end of the precooling evaporator is communicated with the evaporator body. According to the defrosting system, the precooling evaporator is arranged at the bottom of the evaporator body, after the high-temperature high-humidity air returning from the return air inlet is cooled and dehumidified through the precooling evaporator, cooling and heat exchange are conducted on the cooled and dehumidified air through the evaporator body, and therefore part of frost condenses on the precooling evaporator; in this way, the amount of frost on the evaporator body is obviously reduced, frost is even, and the heat exchange efficiency of the evaporator body is effectively improved.

The invention provides a control system for air-conditioning heating and frosting. The control system comprises an air-conditioning system, wherein the air-conditioning system comprises an outdoor unit heat exchanger (3), an electronic expansion valve (8), a compressor (1) and an outdoor motor (4), and further comprises an outer ring temperature detecting element (6) and an outer tube temperature detecting element arranged on the outdoor unit heat exchanger (3) as well as a controller electrically connected with the elements, wherein the controller (7) outputs a control signal to one or more of the electronic expansion valve (8), the compressor (1) and the outdoor motor (4). According to the control system provided by the invention, frostless control can be carried out on a frosting process of an outdoor unit, so that indoor heating comfort is improved; a frosting period is prolonged, so that defrosting action in a using process of a user is reduced; the process is simple and the cost is reduced; and active defrosting is carried out to overcome the defects of passive defrosting. The invention further relates to a control method for carrying out frosting control by utilizing the system.

The invention discloses an indoor air-conditioner, an air conditioning unit and a control method of the air conditioning unit. The indoor air-conditioner comprises a casing, an indoor draught fan, an indoor heat exchanger and a heat storing structure, wherein a first air returning opening, a second air returning opening and an air outlet are formed in the casing; the first air returning opening and the second air returning opening can be separately arranged in an opening and closing manner; the indoor draught fan is arranged in the casing, and used for blowing out returned air from the air outlet, wherein the returned air enters the casing from the first air returning opening and the second air returning opening; the indoor heat exchanger is arranged in the casing, and positioned in an air channel from the first air returning opening to the air outlet; the heat storing structure is arranged in the casing and positioned in an air channel from the indoor heat exchanger and the second air returning opening to the air outlet. According to the indoor air-conditioner, the air conditioning unit and the control method of the air conditioning unit disclosed by the invention, in the defrosting process and / or cold air preventing process of the air conditioning unit, the comfortableness of a room can be improved, and the user experience is improved.

The invention provides an air-conditioner defrosting control method. The air-conditioner defrosting control method comprises the following steps that when the outdoor environmental temperature is higher than 0 DEG C and lower than 5 DEG C, an air-conditioner works in a heating mode, and whether defrosting conditions are met or not is judged; if the defrosting conditions are met, the air-conditioner enters a defrosting mode, the defrosting mode is that a frequency of a compressor is controlled to be a defrosting frequency, and meanwhile, an aperture of an electronic expansion valve is controlled to be a defrosting aperture to enable the surface temperature of an outdoor heat exchanger to be kept at 0 DEG C; and the defrosting frequency is lower than the real-time operational frequency of the compressor in the heating mode, the defrosting aperture is larger than the real-time aperture of the electronic expansion valve in the heating mode, and the air-conditioner keeps operating the defrosting mode till the situation that an exit condition is met is judged. Meanwhile, an air-conditioner defrosting control device and an air-conditioner are further disclosed. According to the air-conditioner defrosting control method, switching between the heating mode and a refrigeration mode is not needed in the defrosting process, defrosting is conducted by using air heat, and the air-conditioner defrosting control method has the advantages that energy consumption is low, and user experience is good.

The invention discloses a method for air conditioner defrosting, which comprises the following steps, namely magnetic valves are provisionally arranged on an outlet of a condensator and a pipe line between a four-way change-over valve and a gas side cutoff valve, the temperature of a coil pipe of the condensator and the temperature of outdoor environment are detected, a defrost operation is judged to be operated or not according to the temperature of the coil pipe of the condensator and the outdoor environment, when in defrosting operation, an indoor draught fan is controlled to operate in a lower speed, and an outdoor draught fan is stopped operating, the magnetic valve is energized to open, the compressor is controlled to operate according to a required frequency of an indoor set, and then the temperature of the condensator is judged to detect whether the temperature is satisfied for the condition of defrosting withdrawal. The magnetic valve is closed after defrosting is existed, and the outdoor draught fun is controlled to start and operate in high speed, and the indoor draught fan is controlled to recover to a normal operation. The invention provides a method for air conditioner defrosting, which solves the problem that a current air condition needs to be transferred to a refrigerating condition in the process of defrosting, and refrigerating effect of the air conditioner is not good.

The invention relates to an air conditioner control method, and provides the air conditioner control method by using a booster heater to shorten defrosting time and cold air prevention time. The air conditioner control method in an indoor heating state comprises the following steps: driving the booster heater during the cold air prevention of an air conditioner, and judging whether temperature of an indoor heat exchanger is higher than a first set temperature, if yes, driving an indoor fan; if not, keeping halted state of the indoor fan until the temperature of the indoor heat exchanger is higher than the first set temperature; and setting an indoor unit into a refrigeration cycle during the defrosting of the air conditioner, turning off the indoor fan, and driving the booster heater. The booster heater is arranged below the indoor heat exchanger. The method aims at the air conditioner containing the electric booster heater, and the electric booster heater is started during the air conditioner heating operation, the cold air prevention and the defrosting so as to shorten the cold air prevention time and the defrosting time, and extends the usage of the booster heater.

The invention discloses a defrosting control method and a defrosting control device for an outdoor unit of an air conditioning unit as well as an air conditioning system. The method comprises the following steps: obtaining an environment temperature of the outdoor unit, a tube temperature of the outdoor unit and operation current of an outdoor fan; when the operation current of the outdoor fan reaches a preset current value and the tube temperature reaches a preset defrosting temperature, controlling the air conditioning unit to start defrosting; determining the preset defrosting temperature by the environment temperature; when the time that the operation current of the outdoor fan reaches the preset current value exceeds the first preset time, controlling the air conditioning unit to start defrosting; obtaining the operation current of the outdoor fan after the air conditioning unit starts defrosting; and when the operation current of the outdoor fan is smaller than the preset current value after the air conditioning unit starts defrosting, controlling the air conditioning unit to stop defrosting. According to the technical scheme provided by the invention, the heating comfort of the air conditioning unit can be improved.

The invention discloses a defrosting control method for an air conditioner. The defrosting control method includes the steps that when the air conditioner enters a defrosting mode, outdoor environment temperature and outdoor environment humidity are obtained; whether the outdoor environment temperature and the outdoor environment humidity meet preset conditions is judged; if yes, an outdoor fan is controlled to rotate reversely according to the pipe temperature and defrosting time of an outdoor heat exchanger so that defrosting can be performed on an enclosure net cover of the outdoor heat exchanger. According to the control method, residual frost on the enclosure net cover of the outdoor heat exchanger can be effectively cleared away. The invention further discloses a defrosting control device for the air conditioner.

The invention discloses a dual heat-source heat-pump hot water device with an extremely simple refrigerating loop. The device is characterized by mainly comprising a compressor, a hot water condenser, a wind heat exchanger, a water heat exchanger, a four-way valve, a bidirectional throttle and the like, wherein a high pressure inlet of the four-way valve is connected with the outlet of the hot water condenser, and the other three ports thereof are connected with air inlets of the wind heat exchanger, the water heat exchanger and the compressor respectively; other ports of the wind heat exchanger and the water heat exchanger are connected with the bidirectional throttle; the exhaust port of the compressor is connected with the inlet of the hot water condenser, and is connected with high pressure air inlet of an electromagnetic pilot valve of the four-way valve; four functions of manufacturing hot water by utilizing water source or air energy and providing air-conditioning cool water by utilizing air-cooling or heating water can be realized by only switching the four-way valve, defrosting can be performed completely and quickly; and a water pre-heater is added to the device to reclaim the heat of waste hot water. The heat pump has the advantages of dual heat sources compensation and wide application range, has multiple functions, extremely simple structure, extremely convenient switching and over 5 of annual comprehensive energy efficiency ratio, and has great popularization value.

The invention provides an air conditioner and a self-cleaning control method of an indoor unit of the air conditioner. An indoor unit heat exchanging assembly of the air conditioner comprises a first indoor heat exchanger and a second indoor heat exchanger which are in tandem connection. The second indoor heat exchanger is connected to a compressor through a refrigerant flow direction switching device. An electronic expansion valve is arranged between the first indoor heat exchanger and the second indoor heat exchanger. The control method comprises the following steps that a trigger signal that the air conditioner starts a self-cleaning function is received, and the refrigerant flow direction switching device is adjusted to a state that the compressor provides a compress refrigerant for the indoor unit heat exchanging assembly; by adjusting the opening degree of the electronic expansion valve, the first indoor heat exchanger is made to conduct refrigerating firstly and then heating so as to constantly frost on the surface of the first indoor heat exchanger in a refrigerating stage; and defrosting is conducted in a heating stage, attached contaminants are taken away by water formed by defrosting, and self cleaning of the first indoor heat exchanger is achieved. According to the scheme, drastic fluctuation of temperature is avoided, and better using experience is brought to users.

The invention discloses a method for controlling an air conditioner. The method is carried out during the defrosting operation and / or in the early stage of the reentering heating operation after finishing defrosting; according to the judgment of the room temperature, the directions of a left blade and a right blade are controlled by utilizing a result detected through a human induction sensor in order that the swinging directions of the left blade and the right blade point to a peopleless region judged by a detection result. During the defrosting, an indoor fan can operate at high rotational speed, improve heat-exchange efficiency in the indoor side and shorten defrosting time; and in the early stage of reentering the heating operation after finishing defrosting, the indoor fan can operate at high rotational speed and improve the heating effect, avoid cold wind from directly blowing on people and improve comfortableness.

The invention discloses an air-conditioner defroster. The defroster comprises a compressor, a four-way valve, an evaporator and a condenser. The defroster also comprises a first pipeline for connecting a liquid inlet of the evaporator with a liquid outlet of the condenser; a second pipeline for connecting an air return inlet of the evaporator with a first port of the four-way valve; a third pipeline for connecting an air inlet of the condenser with a second port of the four-way valve; a fourth pipeline for connecting an air outlet of the compressor with a third port of the four-way valve; a fifth pipeline for connecting a suction inlet of the compressor with a fourth port of the four-way valve; a bypass pipeline with one end communicated with the first pipeline and the other end communicated with the fourth pipeline; a bypass control valve arranged on the bypass pipeline for starting / closing the bypass pipeline; a throttle valve arranged on the first pipeline for regulating the flow of refrigerant in the first pipeline through adjusting the openness of the throttle valve. The invention combines the advantages of heat pump defrosting and hot gas bypass defrosting and can achieve the most effective defrosting.

The invention provides an automobile automatic defogging system and a control method thereof, belongs to the automobile technical field and solves the problem that the defrosting system in the prior art is not smart enough. The system comprises a centralized controller, wherein the centralized controller is connected to a first temperature sensor, a first humidity sensor, a second humidity sensor and an air-conditioning system controller; the air-conditioning system controller controls the air-conditioning system to start the automatic defrosting mode upon determining that the humidity outside the automobile is higher than the humidity inside the automobile; and the centralized controller compares the temperature in the automobile with a predetermined reference temperature, and adjusts an air-conditioning system control instruction according to the temperature in the automobile and makes adjustment on the air-conditioning temperature, air direction and air quantity of the automatic defrosting mode. The method comprises the steps of: (1) starting the automatic defogging system to work; (2) controlling the four door switches of the automobile to be closed; (3) starting the automatic defrosting mode; and (4) adjusting the air outlet direction, the air outlet quantity and the air outlet temperature of the air-conditioning system. The system and the method realize full smart defrosting while keeping the environment in the automobile comfortable.

The invention discloses an air-cooled refrigerator which comprises a refrigeration system, an electrical control device, a sensing device and an air duct system, wherein the sensing device comprises a refrigerating chamber temperature sensor, a freezing chamber temperature sensor and an evaporator temperature sensor; and a timing part arranged in the electrical control device comprises a compressor operation timer, a defrosting pre-preparation timer, an air return defrosting timer and an electrical-heated defrosting timer. The invention also provides an energy-saving defrosting control method of the air-cooled refrigerator. The energy-saving defrosting control method comprises the following steps of: entering a defrosting program; performing defrosting pre-preparation; performing air return defrosting; performing electrical-heated defrosting; and finishing defrosting. According to the air-cooled refrigerator and the air return defrosting control method thereof provided by the invention, signals of each sensor can be received by the electrical control device, the state of each timer can be monitored, fine control over a compressor, a fan and the like can be realized, over-high temperature of a refrigerating chamber, caused by air return defrosting, is prevented, a preservation effect of the refrigerator is reduced, and meanwhile, a closed-loop type poor working process is prevented.

The invention belongs to the field of air conditioning systems, particularly relates to a double-cylinder variable-capacity compressor air conditioning system and a control method thereof. The air conditioning system comprises a large-cylinder circulation loop and a small-cylinder signal loop, wherein the large-cylinder circulation loop is formed by connecting a variable-capacity compressor, a first three-way pipe, a four-way selector valve, an outdoor heat exchanger, a throttle mechanism, an indoor heat exchanger and a second three-way pipe in sequence, and the small-cylinder signal loop is formed by connecting the variable-capacity compressor, the first three-way pipe and the three-way selector valve in sequence. In the control method of the double-cylinder variable-capacity compressor air conditioning system, the opening and the closing of the small-cylinder signal loop are controlled by the switch on / off condition of the three-way selector valve, thereby realizing reliable and active control for a small cylinder of an air conditioner, ensuring the operation of the air conditioner and bringing about good comfort to users; in addition, frost on the outdoor heat exchanger can be removed faster and more completely in the automatic defrosting process, and therefore, users feel more comfortable.

The invention discloses a defrosting control method for an air conditioner. The defrosting control method comprises the processes that after defrosting is completed by an outdoor heat exchanger each time, the running time of the air conditioner running in a heating mode is obtained; when the running time is longer than the preset time and the temperature of the outdoor heat exchanger is higher than or equal to the preset temperature, a one-way valve is opened so that the air conditioner can be controlled to enter a first defrosting mode to conduct defrosting; and when the running time is longer than the preset time and the temperature of the outdoor heat exchanger is lower than the preset temperature, the air conditioner is controlled to be switched to run in a refrigeration mode so that the air conditioner can enter a second defrosting mode to conduct defrosting. The invention further provides a defrosting control device for the air conditioner. According to the defrosting control method and device for the air conditioner, the defrosting efficiency is improved, and meanwhile, the situation that the comfort of the heat pump air conditioner is seriously affected due to the fact that defrosting is conducted in a refrigeration mode frequently is avoided.

The invention provides an air-cooling chilled and hot water air conditioning unit, and a defrosting control method and device therefor and aims to solve the problem that mistaken defrosting easily occurs to the prior defrosting control method. The control method includes: detecting defrosting detection data of the air-cooling chilled and hot water air conditioning unit during heating; judging whether the defrosting detection data meet all preset defrosting conditions or not; allowing a control unit to enter a defrosting mode when the defrosting detection data during heating meets all preset defrosting conditions. According to the control method described in the technical scheme, series of defrosting detection data such as compressor, air pressure and outgoing water temperature when the air-cooling chilled and hot water air conditioning unit heats are detected; the preset defrosting conditions are reasonably set; when the defrosting detection data meets the preset defrosting conditions, the control unit enters the defrosting mode; accordingly, mistaken defrosting is avoided and operational reliability of the air conditioning unit during defrosting can be improved.

The invention discloses an air-conditioner continuous heat-supply and defrost control method, based on an original four-way valve defrost control logic, control logics of hot air bypassing and an induced electricity heater are added in the method, when the defrosting is carried out in winter, the heat quantity can be supplied continuously to a room to ensure the comfortableness of the indoor environment, part of judgment conditions of the original control logic are modified, the begin and the end of the defrosting can be accurately judged and the systematic defrosting and heating can be effectively carried out, thereby greatly increasing the using comfortableness of air-conditioner users, enhancing the product using feelings of users, increasing the reliability of the air-conditioner system and having wide market application prospect.

The invention discloses a defrosting control method for an intelligent air cooling heat pump, belonging to the field of refrigeration and air conditioning. The method comprises the following steps: when an air conditioner is started for heating, a controller detects the outdoor ambient temperature and the temperature of a coiled tube of an outdoor heat exchanger; when the temperature of the coiled tube of the outdoor heat exchanger is lower than the preset frosting temperature of the coiled tube, the coiled tube is judged to be frosted, and the difference between the outdoor ambient temperature and the temperature of the coiled tube of the outdoor heat exchanger at the moment is recorded as the initial frosting temperature difference of the coiled tube; and then the difference between the outdoor ambient temperature and the temperature of the coiled tube of the outdoor heat exchanger is dynamically recorded and judged, and when the difference between the difference and the initial frosting temperature difference of the coiled tube recorded previously is greater than the temperature difference of a preset allowable frosting thickness, and the operation time of a compressor is longer than the preset unstable operation time of the compressor, the air conditioner enters a defrosting mode. The invention has the beneficial effects that: defrosting is carried out only when frost is formed, the defrosting frequency of the compressor and time for defrosting every time are reduced, an unnecessary defrosting period is reduced, and the effects of saving electricity and prolonging the service life of equipment are achieved.