Air source heat pump air conditioner and defrosting method thereof

Abstract

The invention discloses an air source heat pump type air conditioner and a defrosting method thereof. The air conditioner is outdoors connected with a first outdoor heat exchanger (4) and a second outdoor heat exchanger (5) in parallel, electromagnetic valves (6, 7, 8, 9) are respectively arranged on pipelines which connect the first outdoor heat exchanger (4) and the second outdoor heat exchanger (5) with a four-way valve (2), throttle devices (10, 11) are respectively arranged on the pipelines which are connected with an indoor heat exchanger (3), the electromagnetic valves (6, 7, 8, 9) are connected with a detection control system, and the throttle device (12) is connected between the first outdoor heat exchanger (4) and the second outdoor heat exchanger (5). When in need of defrosting, exhaust gas of a compressor is divided into two parts after passing through the four-way valve, one part enters the indoor machine for ensuring the indoor heat supply, the other part enters one of the outdoor heat exchangers for defrosting, condensate enters the other outdoor heat exchanger for evaporating after throttling, and refrigerant vapor returns to the compressor.

Description

technical field [0001] The invention relates to an air source heat pump air conditioner, and also relates to a defrosting method for the air source heat pump air conditioner. Background technique [0002] Since the air source heat pump air conditioner operates in the heating mode in winter, the outdoor heat exchanger is prone to frost, which affects the heat transfer performance of the outdoor heat exchanger and the heating effect of the air conditioner. defrost. [0003] The traditional defrosting method is to stop the fan of the indoor unit, switch the four-way reversing valve, and the air conditioning system operates in a cooling mode. At this time, the outdoor heat exchanger is converted into a condenser under cooling conditions, and the heat required for defrosting of the outdoor heat exchanger is the sum of the heat absorbed by the indoor heat exchanger and the work done by the compressor. This defrosting method has the following disadvantages: [0004] Due to the s...

AI Technical Summary

Problems solved by technology

[0005] Because the indoor fan stops, the indoor unit cannot blow out hot air during the defrosting time, which affects indoor comfort. What is more serious is that the indoor heat exchanger needs to absorb heat from the indoor environment during defrosting, so that the room temperature will drop, causing the The indoor environment is even worse

[0006] Due to the long defrosting time, the defrosting on the upper part of the outdoor heat exchanger will fall to the lower fins, and the frost layer below will accumulate a lot, which is difficult to remove, resulting in ice accumulation and affecting the efficiency of the heat exchanger

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