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Air conditioner defrosting control method and device
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A control method and a technology of a control device, applied in the direction of control input involving air characteristics, space heating and ventilation control input, heating and ventilation control system, etc. Feel uncomfortable and other problems, to reduce energy waste and avoid misoperation
Active Publication Date: 2017-07-18
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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When the ambient temperature of the outdoor heat exchanger changes, this judgment method may cause no-frost defrosting or produce a thick frost layer that cannot enter defrosting, which may cause energy waste or long defrosting time. uncomfortable problem
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Embodiment 1
[0075] 1) The compressor starts to start heating operation, and starts to calculate the start-up time of the compressor;
[0076] 2) Record P0 when the compressor is started for 3 minutes, P0 is the minimum pressure difference in the 3rd to 8th minutes, for example, P0=10Pa;
[0077] 3) When the running time of the air conditioning unit reaches the specified running time of 25 minutes, start to detect P1, and P1 is the real-time value of the pressure difference between the front and back of the outdoor heat exchanger after the 25th minute;
[0078] 4) When △P=P1-P0≥10Pa and last for 2 minutes, that is, when P1≥20Pa and last for 2 minutes, enter defrosting;
[0079] 5) Immediately detect P2 after entering defrosting, P2 is the real-time value of the pressure difference between the front and rear of the outdoor heat exchanger after entering defrosting, if P2≤11Pa, meet the defrosting exit conditions, exit defrosting and resume normal heating;
[0080] 6) Record P0 in the 3rd to...
Embodiment 2
[0082] 1) The compressor starts to start heating operation, and starts to calculate the start-up time of the compressor;
[0083] 2) Record P0 when the compressor is started for 3 minutes, P0 is the minimum pressure difference in the 3rd to 8th minutes, for example, P0=10Pa;
[0084] 3) When the running time of the air conditioning unit reaches the specified running time of 25 minutes, start to detect P1, and P1 is the real-time value of the pressure difference between the front and back of the outdoor heat exchanger after the 25th minute;
[0085] 4) When △P=P1-P0≥10Pa and last for 2 minutes, that is, when P1≥20Pa and last for 2 minutes, enter defrosting;
[0086] 5) Detect T3 immediately after entering defrosting, T3 is the temperature detected by the outdoor heat exchanger tube temperature sensor after entering defrosting. When T3 ≥ 11°C or when T3 ≥ 8°C and the duration is 80s or when the defrost lasts for more than 15 minutes, the defrost exit condition is met, the defro...
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Abstract
The invention discloses an air conditioning defrosting control method and device. The air conditioning defrosting control method comprises obtaining the differential pressure of the front portion and the rear portion of an outdoor heat exchanger of an air conditioning to serve as an original differential pressure P0 after a first preset time is started through a compressor; timely obtaining the differential pressure of the front portion and the rear portion of the outdoor heat exchanger to serve as a current differential pressure P1 after a second preset time is started through the compressor and obtaining the difference delta P between the current differential pressure and the original differential pressure through calculation, wherein the formula as follows; controlling the air conditioning to enter the defrosting mode when the delta P is not less than a first preset threshold value and the time duration is equal to a third preset time. According to the air conditioning defrosting control method and device, pressure sensors are arranged on the front portion and the rear portion of the outdoor heat exchanger of the air conditioning respectively so as to determine whether the air conditioning needs to enter the defrosting or exit from the defrosting through the differential pressure change of the front portion and the rear portion of the outdoor heat exchanger in the running process of the air conditioning and accordingly the false operation of the outdoor heat exchanger due to the differential pressure change caused by other reasons can be effectively avoided, the defrosting of a system is accurately determined, and the energy waste is reduced.
Description
technical field [0001] The invention relates to the field of air conditioners, in particular to a defrosting control method and device for an air conditioner. Background technique [0002] During the heating operation of the heat pump air conditioner, the refrigerant exchanges heat with the outdoor air through the outdoor heat exchanger, absorbs heat from the outdoor air and evaporates, and the compressor compresses the low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant vapor, which enters the The indoor heat exchanger releases heat; the heat released by the indoor heat exchanger is used to heat the indoor air, so that people can enjoy a more comfortable environment. [0003] Because the outdoor heat exchanger absorbs heat from the outdoor air, the temperature around the outdoor heat exchanger is low, and the water vapor in the air will condense into frost and adhere to the surface of the outdoor heat exchanger, which affects the...
Claims
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Application Information
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