Heat-pump-type air conditioning system, sensible-heat defrosting method, heat-storage defrosting method

Abstract

The invention discloses a heat-pump-type air conditioning system which comprises an indoor heat exchanger, an outdoor heat exchanger, a first pipeline, an expansion valve, a compressor, a four-way valve, a heat storage loop and a hot-gas bypass loop. The first pipeline connects the indoor heat exchanger with the outdoor heat exchanger, the expansion valve is serially connected on the first pipeline, the compressor is used for compressing refrigerant steam, the four-way valve is connected with an input end and an output end of the compressor and connected with the indoor heat exchanger and the outdoor heat exchanger, one end of the heat storage loop is connected between the expansion valve on the first pipeline and the outdoor heat exchanger, a first two-way valve and a heat accumulator wrapped on the outer wall of the compressor are serially connected on the heat storage loop, the other end of the heat storage loop is connected with an input end of the compressor, one end of the hot-gas bypass loop is connected between the output end of the compressor and the indoor heat exchanger while the other end of the same is connected with the outdoor heat exchanger, and a second two-way valve and a throttling device are serially connected on the hot-gas bypass loop. By the heat-pump-type air conditioning system, temperature difference between a refrigerant flowing into the heat accumulator and the heat accumulator is increased, and defrosting effect is effectively improved. The invention further provides a sensible-heat defrosting method and a heat-storage defrosting method.

Description

technical field [0001] The invention relates to the technical field of air conditioning equipment, in particular to a heat pump air conditioning system, a sensible heat defrosting method, and a thermal storage defrosting method. Background technique [0002] During the heating process of the heat pump air conditioning system, when the outside temperature is low, frost is easy to form on the outdoor heat exchanger, which reduces the heat exchange effect of the outdoor heat exchanger, thus affecting the heating process of the heat pump air conditioning system. When frosting reaches a certain level, the indoor heating effect will be reduced, and even the indoor heat exchanger will not be able to heat, that is, it will not be able to blow out heating air higher than the indoor temperature. At this time, it is necessary to remove the frost on the outdoor heat exchanger to restore its heat exchange effect and ensure the heating effect of the indoor heat exchanger. [0003] With t...

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Problems solved by technology

[0004] Since the temperature of the heat accumulator in the heat pump air conditioning system is generally not high, during the defrosting process, the refrigerant directly enters the heat accumulator after flowing through the indoor heat exchanger, so that the refrigerant flowing into the heat accumulator and the heat accumulator The temperature difference is small, which is not conducive to the refrigerant absorbing heat after flowing into the accumulator. In severe cases, the temperature of the accumulator may even be lower than or equal to the temperature of the refrigerant, so that the refrigerant cannot absorb heat from the accumulator, but will release heat instead. Meet the defrosting operation in the heat pump air conditioning system, so that the defrosting effect is low

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