Defrosting operation method for heat pumps

Abstract

The invention relates to a kind of defrosting technique by a caloric pump, including: the heating operation that the cold-producing medium passes through a reversible valve which is connected to the compressor, and then takes turns to flow pass the indoor heat exchanger , electronic dilating valve, container, extraventricular heat exchanger ; the defrosting operation that switches to the refrigerating operation via a reversible valve to remove the frost in the extraventricular heat exchanger; and the defrosting-relieving operation after the defrosting operation that switches to the heating operation again. the defrosting operation said above is made up of the process that by reducing the frequency of the compressor to the minimum to minish the pressure difference of the caloric pump system under the context of opening the electronic dilating valve completely, and the process that after switching the reversible valve according to the cold-producing model raising the frequency of the compressor to the maximum to remove the frost. the defrosting-relieving operation said above is made up of the process that reducing the frequency of the compressor to the minimum to minish the pressure difference of the caloric pump system when the temperature sensor which is installed outside the extraventricular heat exchanger's tube examines the condition satisfied with that of the defrosting-relieving operation and the process after the defrosting operation closing the electronic dilating valve completely as well as switching the reversible valve according to the heating model, and the process that increasing the frequency of the compressor and the electronic dilating valve in turns .

Description

technical field [0001] The present invention relates to a heat pump, and more particularly to a defrosting operation of a heat pump capable of preventing refrigerant liquid from flowing into a compressor when the defrosting operation for removing frost generated on the surface of an outdoor heat exchanger is completed and then switched to a heating operation. method. Background technique [0002] Usually, a heat pump has both cooling capacity and heating capacity, and one outdoor unit and one indoor unit are connected to each other. [0003] In contrast, with a heat pump, one outdoor unit can be connected to multiple indoor units to selectively operate the indoor units. [0004] Thus, a multistage heat pump capable of cooling operation and heating operation will be described with reference to the drawings. [0005] in the heat pump system figure 1 In , solid line arrows indicate the flow of refrigerant during cooling operation, and dotted l...

AI Technical Summary

Problems solved by technology

[0037] This pressure drop inside the heat accumulator 13 affects the flow resistance of the inlet piping of the compressor 11, and there is a risk that the efficiency of the heat pump will decrease.

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