32results about How to "Avoid frequent defrosting" patented technology

The invention relates to a control method and system for defrosting judgment of an air conditioner. The control method for defrosting judgment of the air conditioner comprises the following steps that S1, the continuous operation time T in a heating mode state is collected; S2, whether the continuous operation time T is lager than or equal to a target time T1 is judged, the step S3 is executed if yes, and the step S1 is executed again if not; S3, whether the current temperature Tt of a condenser coiler is smaller than a target temperature Ta or not is judged, the step S4 is executed if yes, and the step S2 is executed again if not; S4, operation in the defrosting mode is controlled according to the dropping speed of the temperature of the condenser coiler. According to the control method and system for defrosting judgment of the air conditioner, whether defrosting is needed for a condenser or not is judged by dynamically acquiring the dropping speed of the temperature of the condenser coiler, the thickness of a frost layer can be intelligently and accurately reflected by the dropping speed of the temperature of the condenser coiler, and the problems that due to the fact that the defrosting mode is started frequently, the heating effect of the air conditioner is affected, fluctuation of the indoor temperature is caused, and use comfort is affected are solved.

The invention provides a defrosting control method of an air conditioner and an outdoor unit thereof. In the defrosting control method, a heating index temperature of an indoor unit is continuously monitored; and a mean value of the heating index temperature in a heating time period is calculated according to the heating index temperature. The mean value expresses the mean heating capacity of theair conditioner in the whole heating process; and when the mean value is lowered, an optimal defrosting beginning point of a heat exchanger of the outdoor unit is reached. When the heating index temperature is lower than the mean value of the heating index temperature, the outdoor unit of the air conditioner is defrosted, so that the optimal defrosting effect can be achieved. The defrosting methodcan defrost in the optimal time point, prevents frequent defrosting of the air conditioner to save the energy, guarantees the heating effect of the air conditioner, and improves the use experiences of users.

The invention provides an air conditioner defrosting control method and device as well as an air conditioner. The air conditioner defrosting control method comprises the following steps: obtaining anouter coil tube temperature of an air conditioner every preset time interval, and determining a first-order derivative and a second-order derivative of the outer coil tube temperature; and controllingthe air conditioner to defrost while the first-order derivative and the second-order derivative meet set conditions. By determining the first-order derivative and the second-order derivative of the outer coil tube temperature, defrosting can be determined to perform on the air conditioner according to the first-order derivative and the second-order derivative, and a defrosting condition can be intuitively determined; when frosting degree of the air conditioner is relatively light, defrosting is not performed, so that precise defrosting is performed while frost is relatively thick; and meanwhile, frequent defrosting caused by incomplete defrosting can be avoided.

The invention discloses a ternary-cycle air cooled refrigerator. An electrical control device internally stores parameters such as a refrigerating fan operating target time parameter LCFSJ. The defrosting method comprises a freezing chamber defrosting method, a refrigerating chamber defrosting method and a variable temperature chamber defrosting method. The freezing chamber defrosting method comprises a defrosting entering preparing step, a defrosting preparing step, a defrosting entering step, a defrosting step and a defrosting existing step. According to the ternary-cycle air-cooled refrigerator and the defrosting method thereof, considering specific working conditions in the operation process of the refrigerator, accurate matching of the defrosting control and the actual working conditions is realized, the defrosting effect is ensured, the condition that defrosting is carried out when defrosting is not needed is avoided, frequent defrosting is avoided, excessive starting of a defrosting electrical heater is avoided, so that energy is saved, and a phenomenon that defrosting cannot exit is prevented.

The invention relates to the technical field of defrosting, in particular to a defrosting control method and device of an air conditioner and the air conditioner. According to the scheme, when the airconditioner works, different environmental temperature intervals are divided according to outer loop temperature and air humidity, so as to cover all the temperature ranges of unit operation; whetherdefrosting conditions are met or not is judged according to the outer loop temperature and air humidity; and a defrosting actions corresponding to each environmental temperature interval is executedaccording to the environmental temperature interval. Accurate defrosting is achieved, frequent defrosting is prevented, an outdoor heat exchanger is divided into a first heat exchanger unit and a second heat exchanger unit during defrosting, and the two units perform defrosting alternately, so that the air conditioner can operate efficiently without frost while requirements on defrosting and customer comfort are met.

The invention relates to an air-conditioner and a defrosting method and a defrosting device thereof. The defrosting method comprises the steps that after starting of a compressor is completed, running time T1 of the compressor is recorded; when the time T1 is equal to preset time T, a suction pressure value or an evaporation pressure value is detected; when the suction pressure value or the evaporation pressure value is smaller than a preset pressure value, a running pressure specific value of the air-conditioner and continuous time T2 of the air-conditioner are detected; when the pressure specific value and/or the continuous time T2 and a preset pressure specific value meet the defrosting condition, the air-conditioner is controlled to carry out defrosting, thus, frequent defrosting can be avoided, the period of carrying out defrosting in a severe frosting environment can be shortened, intelligent defrosting can be achieved effectively, the good defrosting effect is achieved, a unit can be protected, and reliable running of the unit can be achieved.

The invention provides a method for preventing frost from being formed on an evaporator and an air conditioner. The method for preventing frost from being formed on the evaporator comprises the stepsthat condenser outer plate temperature is obtained in a low-temperature refrigeration mode; if the condenser outer plate temperature is lower than a condenser outer plate temperature threshold value,the continuous working time of condenser refrigeration is obtained; if the continuous working time of condenser refrigeration is greater than a condenser refrigeration working time threshold value, adefrosting mode is enabled, wherein the continuous working time is the continuous refrigeration working time of the condenser after the condenser outer plate temperature is lower than the condenser outer plate temperature threshold value. According to the method for preventing frost from being formed on the evaporator and the air conditioner, the frosting situation of the evaporator can be accurately judged during low-temperature refrigeration by detecting the condenser outer plate temperature and the operating situation of a compressor, thus frost is effectively prevented from being formed onthe evaporator, and the abnormal situation is avoided.

The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner defrosting control method. In order to prevent excessive room temperature fluctuation during defrosting, the defrosting control method comprises the following steps that the accumulated heating capacity Q accumulation of the air conditioner is calculated in real time, and the calculation starts from the time when the air conditioner enters the defrosting mode for the first time after the air conditioner is started; and the accumulated heating capacity Q accumulation is compared withthe preset heating capacity Q, and whether the air conditioner enters the defrosting mode again or not is judged according to the comparison result, wherein the time for entering the defrosting modeof the air conditioner for the first time after the air conditioner is started is determined according to the following modes that the time T for entering the defrosting mode of another air conditioner consistent with the air conditioner in model for the first time after each starting in the same environment and under the same operating condition is acquired, and the time for entering the defrosting mode of the current air conditioner for the first time after the current air conditioner is started is determined according to the time T. According to the air conditioner defrosting control method, the time for entering the defrosting mode of the air conditioner for the first time after the air conditioner is started can be judged more accurately, and the influence on the indoor temperature inthe defrosting process can be reduced to the maximum extent.

The invention relates to an ionic solution three-cycle coupling low-temperature heat supply system and a using method. The ionic solution three-cycle coupling low-temperature heat supply system comprises a low-temperature heat collection subsystem, a heat pump energy supply subsystem and an enthalpy increasing regeneration subsystem. The low-temperature heat collection subsystem is provided with an ionic solution heat collection circulation loop, and the heat pump energy supply subsystem is provided with an ionic solution energy supply circulation loop. And the enthalpy increasing regeneration subsystem is provided with an ionic solution regeneration circulation loop. The low-temperature heat collection subsystem and the enthalpy increasing regeneration subsystem are communicated with each other through the ionic solution regeneration circulation loop, and the enthalpy increasing regeneration subsystem supplies and conveys a regenerated ionic solution to the low-temperature heat collection subsystem through the ionic solution regeneration circulation loop. The low-temperature heat collection subsystem and the heat pump energy supply subsystem are communicated with each other through the ionic solution energy supply circulation loop, and the low-temperature heat collection subsystem transfers heat to the heat pump energy supply subsystem through the ionic solution energy supply circulation loop. According to the ionic solution three-cycle coupling low-temperature heat supply system and the using method, a small amount of electric energy is input through a heat pump unit, and thus low-temperature heat energy below the freezing point can be transferred to the high-temperature position. And the requirements of building heating and heat supply are met.