Novel defrosting method applied to air source heat pump unit

Abstract

The invention relates to the technical field of defrosting of air source heat pump units, and discloses a novel defrosting method applied to an air source heat pump unit. The novel defrosting method comprises the air source heat pump unit, and the air source heat pump unit is a unit taking air as a heat source and comprises but is not limited to an air-cooled cold and hot water unit, an air-cooled heat pump type direct expansion unit and the like. According to the frosting condition of the outdoor fin type heat exchanger of an evaporator, a bypass proportion adjusting device, an outdoor environment temperature sensor, an outdoor fin type heat exchanger coil temperature sensor, a compressor exhaust pipe and a high-pressure pressure sensor and a low-pressure pressure sensor which are fixedly installed on an air suction pipe are matched with one another to intelligently adjust the flow of refrigerant bypassed to the evaporator from a compressor, and the efficient defrosting effect is achieved. The air source heat pump unit can operate more stably and reliably, the operation can be carried out when the air source heat pump unit operates in a normal heating mode, the air source heat pump unit does not need to frequently start and stop the compressor or frequently reverse, the operation of the unit is more stable and reliable, and meanwhile the comfort experience of a user for an air conditioner cannot be affected by defrosting of the unit.

Description

technical field [0001] The invention relates to the technical field of defrosting of an air source heat pump unit, in particular to a novel defrosting method applied to an air source heat pump unit. Background technique [0002] Air source heat pump is a kind of heat pump technology. It uses air as the heat source of the unit, including but not limited to air-cooled hot water unit, air-cooled heat pump direct expansion unit, air-cooled heat pump unit unit, air-cooled heat pump constant temperature Constant humidity units, etc., have multiple advantages such as low cost of use, easy operation, good heating effect, safety, and cleanliness. Without complex configuration, expensive water intake, recharge or soil heat exchange system and special machine room, it can gradually reduce the large amount of pollutant emissions brought by traditional heating to the atmospheric environment, and achieve the purpose of energy saving and environmental protection while ensuring heating effi...

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Problems solved by technology

[0003] At present, when the air source heat pump unit is in heating operation in winter, it is inevitable that there will be frosting on the outdoor fin heat exchanger. There are two solutions to the problem of frosting. One is to reverse the defrosting: when defrosting , stop the compressor first, then change the direction of the four-way reversing valve, the compressor will directly discharge the hot air into the outdoor fin heat exchanger, and melt the frost on the fins, thereby achieving the defrosting effect, but using this principle Especially in the environment prone to frost, the compressor will start and stop frequently, and the four-way reversing valve will change frequently, which will greatly shorten the service life of the unit and affect the user's comfort experience of the air conditioner; Bypass defrosting: When defrosting, the high-temperature and high-pressure gas in the exhaust gas is directly mixed into the outdoor fin heat exchanger, so as to achieve the defrosting effect, but the defrosting device using this principle will cause the heat-absorbing side The heat exchange state fluctuates greatly, which affects the overall heat exchange effect. Although the above two methods can solve the problem of frosting, there are still big problems. For this reason, this application provides an application New defrosting method for air source heat pump unit

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