220 results about "Frost (temperature)" patented technology

The invention relates to a defrosting control method for a heat pump unit and the air conditioner heat pump unit adopting the defrosting control method. The situations such as inaccurate judgment of the frosting condition, conduction of defrosting operation under the frostless condition and incomplete defrosting are avoided, the comfort level of an air conditioner is improved, and energy is saved. The real-time temperature of an external coil pipe is monitored, the thickness of a frost layer is judged according to change conditions of the temperature of the external coil pipe and the duration, defrosting is performed when the frost layer has the certain thickness, and defrosting conditions can be adjusted in real time according to temperature and humidity change after running of the unit, so that the unit is adapted to different actual environments.

The invention relates to a frost preventing and removing system and a frost preventing and removing method of a heat pipe type air conditioner. A compressor waste heat recovery channel is separated from an outdoor machine through a partition plate; a compressor and an exhaust pipeline are positioned in the compressor waste heat recovery channel; the compressor waste heat recovery channel is internally provided with a waste heat recovery fan and a horizontal heat pipe; and the horizontal heat pipe is parallel to the heat transfer pipe of an outdoor heat exchanger and closely coupled with the heat transfer pipe of the outdoor heat exchanger through a heat exchange fin. According to the frost preventing and removing method which is disclosed by the invention, heat pipe technology compressor waste heat recovery based frost removal and hot gas bypass based frost removal are effectively combined. The frost preventing and removing system disclosed by the invention can realize a winter heating frost preventing mode, a winter heating periodical double-effect frost removing mode and a winter heating optimizing operation mode when operated for winter heating, has dual functions, namely frost prevention and removal, and the outstanding advantages of prolonging the frosting time, shortening the frost removing time, realizing the continuous heat supply of an indoor machine, and the like, and can be used for reducing the condensing temperature by realizing the double-effect cooling of the outdoor heat exchanger by adopting a heat pipe technology when operating for summer cooling, thereby reducing the power consumption of the compressor and enhancing the work property of a machine set.

The invention discloses a control method and device of an air conditioner, a storage medium and the air conditioner. The method includes the steps that the frosting amount of an outdoor heat exchangerof the air conditioner is determined, wherein the frosting amount of the outdoor heat exchanger comprises the frost layer thickness of the outdoor heat exchanger; if the frost layer thickness of theoutdoor heat exchanger belongs to a set defrosting frost layer thickness range, the air conditioner is controlled to be switched into a defrosting manner from a heating manner; if the frost layer thickness of the outdoor heat exchanger belongs to a set non-defrosting frost layer thickness range, the heat comfort state of an indoor environment of the air conditioner is determined; and the air conditioner is controlled to continue to be subjected to heating operation in the heating manner according to the heat comfort state of the indoor environment or be switched into the defrosting manner fromthe heating manner. By means of the scheme, the problems that whether defrosting is carried out or not is judged according to the temperature of the outdoor heat exchanger or the difference between the temperature of the outdoor heat exchanger and the temperature of an outdoor environment, when defrosting exists, the indoor temperature drop is large, and therefore the defrosting heat comfort is poor can be solved, and the effect of improving the defrosting heat comfort is achieved.

The invention discloses a defrosting control system and method for an air source heat pump. According to the defrosting control system, based on an original system structure for the air source heat pump, a temperature sensor and cameras for camera-shooting the frosting condition of the surface of an outdoor side heat exchanger are arranged on the outer portion of the outdoor side heat exchanger, the surface of the outdoor side exchanger is coated with underlying color significantly different from frost color, the temperature of accessories of the outdoor heat exchanger is detected by the temperature sensor, the system defrosting function is enabled when the set temperature is reached, meanwhile the cameras are activated and opened automatically, and the frosting condition of the surface of the outdoor heat exchanger can be monitored in real time.

The invention discloses a self-cleaning method and device of an air conditioner, the air conditioner and electronic equipment. The self-cleaning method comprises the steps that the response to a self-cleaning instruction for the air conditioner is achieved, and the air conditioner is controlled to enter a condensate water forming stage; the situation that the temperature of an indoor coil pipe isreduced to the first preset temperature in the condensate water forming stage is detected, and then the air conditioner is controlled to enter a refrigeration frosting stage; the temperature reductionspeed of the process that the temperature of the indoor coil pipe is reduced to the second preset temperature from the first preset temperature in the refrigeration frosting stage is obtained; the target rotating speed of an indoor fan in the air conditioner in the refrigeration frosting stage is determined according to the temperature reduction speed; and the situation that the temperature of the indoor coil pipe is reduced to the first target temperature of an evaporator in the air conditioner is recognized, and then the air conditioner is controlled to enter a defrosting stage. According to the self-cleaning method, the target rotating speed of the indoor fan in the refrigeration frosting stage can be determined according to the temperature reduction speed, and therefore the problem that due to the fact that the frosting speed is high, the formed frost is not uniform can be solved, the situation that the enough frosting quantity is generated by an indoor heat exchanger is guaranteed, and the cleaning effect of the indoor heat exchanger is enhanced.

The invention provides a method and device for controlling ultrasonic defrosting, a storable medium and an air conditioner. Based on features like a high frequency, a short wave length and effective energy centralization of ultrasonic waves and the proper control method, defrosting is realized by the ultrasonic waves; effects of frost restraining and defrosting are reached; comfort demands of users in defrosting are satisfied; and efficient frost-free running of a heat pump air-conditioning unit can be expected. The control method comprises the steps that the air conditioner is started for heating, an outdoor environment temperature T<outer ring>, an outdoor heat exchanger coil temperature T<outer coil> and an outdoor environmental relative air humidity h are detected after normal runningfor first preset time t1; when the T<outer ring>, the T<outer coil> and h satisfy preset defrosting working conditions, the air conditioner starts an ultrasonic defrosting mode; and when the preset defrosting working conditions are not satisfied, the air conditioner can keep running under an original working mode, and the pre-set defrosting working conditions are judged for a time at an interval of second preset time t2.

The invention relates to the technical field of defrosting of air source heat pump water chilling units, in particular to frost restraining and defrosting equipment for an air source heat pump water chilling unit for different humidities and a frost restraining and defrosting control method. The air source heat pump water chilling unit and a frost restraining and defrosting device are arranged. The frost restraining and defrosting equipment is characterized in that an outdoor temperature sensor, an outdoor air relative humidity sensor, an evaporator temperature sensor, a video camera monitor,a surface air cooler fin photoelectric frost measuring sensor and a controller are arranged on the air source heat pump water chilling unit; the outdoor temperature sensor, the outdoor air relative humidity sensor, the evaporator temperature sensor, the video camera monitor and the surface air cooler fin photoelectric frost measuring sensor are connected with the frost restraining and defrosting device through the controller, and the frost restraining and defrosting device is controlled to work through the controller after detection numerical analysis of all the sensors. The frost restrainingand defrosting equipment and the frost restraining and defrosting method have the advantages that the method is simple, frost inhibition control has pertinence, the defrosting efficiency is high, andthe defrosting effect is good.

The invention discloses an air source heat pump defrosting device based on a multi-effect synthetic action at an initial frosting stage. The air source heat pump defrosting device comprises a refrigerant circuit, an air circuit and a defrosting speed regulation system. At the initial frosting stage, a frost layer is sparse and short or is in a non-frozen liquid drop state, thereby being easy to remove. According to the air source heat pump defrosting device, the growing characteristics of the frost layer at the initial frosting stage are fully utilized, high-temperature, high-pressure and dry air directly acts on the finned surface of a second heat exchanger through air supply nozzles, and therefore quick defrosting with the multi-effect synthetic action including blowdown, thawing and evaporation is achieved. Meanwhile, the defrosting speed regulation system can control the acting time of the high-temperature and high-pressure air on the finned surface by changing the vertical movement speed of the air supply nozzles along the second heat exchanger so as to achieve the effect that the frost layer at different frosting degrees is completely removed. The air source heat pump defrosting device is low in defrosting energy consumption, normal heating running of a heat pump system is not influenced in the defrosting process, the heat supply time of the heat pump system is prolonged, and the heat supply efficiency of the heat pump system is improved.

The invention discloses a method for determining defrosting of an air source heat pump unit. The method comprises the following steps of acquiring the ambient temperature, ambient humidity, and fin temperature by a sensor detection module of the heat pump unit; judging that the ambient humidity is greater than or equal to the predetermined defrosting humidity, determining the first defrosting timeby checking a relationship table of the ambient temperature and the ambient humidity, and acquiring the compressor running time; and judging that the compressor running time is greater than the firstdefrosting time, judging that the fin temperature is smaller than or equal to the preset defrosting chip temperature, judging that the ambient temperature is smaller than or equal to the preset defrosting ambient temperature, judging that the difference between the ambient temperature and the fin temperature is less than or equal to a preset defrosting ring fin difference, and entering a defrostprocedure. According to the method for determining the defrosting of the air source heat pump unit provided by the invention, by acquiring the ambient humidity, judging the ambient temperature, the problem that the that the energy efficiency of the unit is reduced caused by defrosting or excessive frosting of the unit due to the phenomenon that the ambient humidity is too low and the unit enters defrosting without frosts, and the phenomenon that the ambient humidity is too high and the unit does not enter defrosting when the frosting is serious is solved.

The invention provides an air conditioner and a control method thereof. The control method comprises the steps that outdoor temperature prediction information of the position where the air conditioneris located is obtained; according to the outdoor temperature prediction information, a condensation condition required to be reached when a frost and dew condensation event occurs in an indoor environment where an indoor unit of the air conditioner is located is determined; whether the indoor environment is about to reach the condensation condition is judged; if yes, the air conditioner is controlled to adjust the running state so as to prevent the indoor environment from the frost and dew condensation event. By means of the method, the air conditioner can automatically prevent the frost anddew condensation event from occurring, the intelligent degree is improved, and the air conditioner is particularly suitable for viewing buildings with large glass doors and windows.

The invention discloses a control method for defrosting without shutdown and a refrigeration device. The control method comprises the steps that a conventional refrigeration mode is executed, a refrigerant sequentially flows through at least two evaporators, and throttling is carried out through a throttling device before the refrigerant flows into the first evaporator; operation parameters of theconventional refrigeration mode are detected, and whether the operation parameters meet preset defrosting conditions or not is judged; and if yes, a defrosting refrigeration mode is executed, the refrigerant flows into the first evaporator from a bypass pipeline, and throttling is carried out through the throttling device before the refrigerant flows into the remaining evaporators. According to the control method for defrosting without shutdown and the refrigeration device, the high-temperature refrigerant which is not throttled is directly fed into the first evaporator, so that a frost layeron the surface of the refrigerant is melted, the refrigerant is throttled through the throttling device before flowing into the remaining evaporators, compensation refrigeration is carried out on circulating air, low-temperature air supply is maintained, and therefore the temperature in the refrigeration device is kept at a low temperature.

The invention relates to a frosting and dewing preventing device special for a low-temperature blackbody radiation source. A heating device, a three-way electromagnetic valve, a refrigerating device,a solid-state relay and the like are installed in a shell, moisture in air is evaporated through a furnace body, a humidity sensor measures the humidity value in gas and then sends the humidity valueto the three-way electromagnetic valve, when the humidity value is greater than a set value, the electromagnetic valve is in a closed state, and the gas is exhausted into the environment through an exhaust pipe; when the humidity value reaches a set value, the electromagnetic valve is switched on to enable gas to enter the condenser for cooling; the obtained dry gas is enabled to pass through a filter; impurity particles in the dry gas are removed and then the dry gas enters the low-temperature blackbody radiation source cavity. The pressure of dry gas in the cavity space is greater than the ambient pressure, gas containing moisture is effectively prevented from entering the cavity to be condensed into frost and dew, and the device is safe, reliable, good in temperature stability, low in cost, high in working efficiency, beneficial to measurement of infrared optical instrument and meter equipment and more beneficial to use in narrow and small space.

The invention provides a heat pump air conditioner frosting judgment method, a computer readable storage medium and an air conditioner. The method comprises the steps: after the air conditioner is started and enters a heating operation mode, detecting current of a motor of an outer fan in real time to obtain a real-time current value; judging whether frosting conditions are met or not according tothe difference between the real-time current value and the normal operation current value of the motor, and then, judging and analyzing the temperature of an outer pipe; and when the two judgment conditions are met at the same time, judging that an outdoor heat exchanger frosts and enters a defrosting mode. The current value is used as the frosting judgment condition and is not easily influencedby the environment temperature and humidity, so that whether frosting occurs or not can be judged more accurately, and the situations of missed judgment and misjudgment and the like are prevented.

The invention discloses an anti-frosting method with low energy consumption. The anti-frosting method is characterized by comprising the following steps: forming a nanostructure on the surface of a substrate, and modifying a low surface energy substance, so as to obtain a micro-droplet self-release surface capable of delaying frost crystal formation and/or accelerating frost crystal melting, and then realizing a frost-free surface by combining with an auxiliary method with micro-energy consumption under low energy consumption. According to the anti-frosting method disclosed by the invention, by a chemical deposition method, an electrochemical corrosion method and the like, various nanostructures (such as nanocones, nanoneedles, nanoflowers and multi-scale nanostructures) are prepared on the substrate material and the low surface energy substance is modified to obtain the micro-droplet self-release surface, such surface can effectively delay the frost crystal formation under the conditions of high humidity and wall temperature lower than the freezing point, and the frost crystal covering time of the surface is dozens of times that of a smooth surface; by further combining with the auxiliary means with micro-energy consumption, the frost-free surface can be realized for a long time under low energy consumption.

The invention discloses a novel defrosting system and a control method thereof. The novel defrosting system comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, an electronic expansion valve and an indoor heat exchanger, an air outlet and an air inlet of the compressor are connected through a second air return pipeline, and an electromagnetic valve device is arranged on the second air return pipeline. A novel defrosting method of an air conditioner includes the steps of (1) thin frost and thick frost detection and judgment, and (2) defrosting: when judgment is thin frost, adopting a thin frost removal mode, and when judgment is thick frost, adopting a thick frost removal mode. By the novel defrosting system and the control method thereof, the thin frost and the thick frost can be distinguished automatically, different defrosting modes are adopted for the thin and thick frost to allow indoor temperature to be more stable, defrosting effect is better, and waiting time of customers is shortened.

The embodiment of the invention provides a controller, an air conditioner floor heating system and an anti-freezing control method thereof, and relates to the technical field of air conditioners. Theanti-freezing control method for the air conditioner floor heating system includes the steps of obtaining the temperature Tci of a liquid pipe of a water module, obtaining the temperature Tco of an air pipe of the water module, and if Tci is smaller than or equal to a first preset value and Tco is smaller than or equal to a second preset value, controlling the air conditioner floor heating systemto start an anti-freezing mode. The temperature Tci of the liquid pipe of the water module and the temperature Tco of the air pipe of the water module are obtained and compared with the preset values,if Tci is smaller than or equal to the first preset value and Tco is smaller than or equal to the second preset value, it means that an electronic expansion valve has a leakage phenomenon at that time, and if the evaporation temperature is lower than the freezing point after leakage of refrigerants, water in the water module will have a freezing and expansion phenomenon. By controlling the air conditioner floor heating system to start the anti-freezing mode, the temperature of the water in the water module can be improved, and the risk of frost damage to the water module can be lowered.

A refrigeration cycle apparatus includes a low temperature-side refrigeration cycle 110, a high temperature-side refrigeration cycle 120, defrosting detecting means 116 which detects a frost-formed state of a low temperature-side evaporator 114 of the low temperature-side refrigeration cycle 110. When an operation should be shifted to a defrosting operation for thawing frost of the low temperature-side evaporator 114, an operation of the low temperature-side compressor 111 of the low temperature-side refrigeration cycle 110 is continued, an operation of the high temperature-side compressor 121 of the high temperature-side refrigeration cycle 120 is stopped, and the operation is shifted to the defrosting operation. When the operation is shifted to the defrosting operation, heat-accumulated high temperature low temperature-side refrigerant is supplied to the low temperature-side evaporator 114 to defrost. Therefore, it is possible to shorten the defrosting time and to enhance the operation efficiency of a refrigeration cycle.

A refrigerator including a main body including a storeroom; an evaporator arranged in the back of the storeroom and configured to generate cold air; a defrost heater arranged under the evaporator into which air flows and configured to remove frost or ice formed on the evaporator; a temperature sensor arranged on the top of the evaporator and configured to measure temperature; and a controller configured to stop operation of the defrost heater in a first defrost cycle based on a first measurement measured by the temperature sensor and stop operation of the defrost heater in a second defrost cycle based on a second measurement, which is different from the first measurement.

The invention relates to a control method and device for defrosting of an air conditioner and the air conditioner. The control method comprises the following steps of after the air conditioner executes the defrosting process, acquiring the defrosting duration of the defrosting process executed by the air conditioner; correcting the frost point temperature based on the defrosting duration of the defrosting process executed by the air conditioner; and based on the corrected frost point temperature, controlling the air conditioner to carry out defrosting judgment of whether the next defrosting process is triggered or not. According to the control method for defrosting of the air conditioner, the frost point temperature can be corrected by utilizing the defrosting duration of the defrosting process executed by the air conditioner, so that the problems of large errors between the frost point temperature and the actual working condition and inaccurate triggering of the defrosting process caused by the fact that the frost point temperature is determined by utilizing the dew point temperature and the working state of components of the air conditioner is changed in the prior art can be reduced, and the defrosting function of the air conditioner can be controlled more accurately.