Air-source heat pump air heater and refrigerant flow control method of air-source heat pump air heater system

Abstract

The embodiment of the invention discloses an air-source heat pump air heater and a refrigerant flow control method of an air-source heat pump air heater system. The air-source heat pump air heater comprises a compressor, a multi-way valve, a flash evaporator, an outer heat exchanger, a throttling element and at least two inner heat exchangers. The refrigerant flow control method comprises the steps that whether or not the liquid level of the flash evaporator is within a preset liquid level range is determined, if not, the refrigerant inflow rate of the flash evaporator is adjusted to make theliquid level of the flash evaporator tend to fall within the preset liquid level range, and then whether or not the liquid level of the flash evaporator is within the preset liquid level range is determined again; and whether or not the superheat degree of return air of the air-source heat pump air heater system is within a preset superheat degree range is determined, if not, the refrigerant outflow rate of the flash evaporator is adjusted to make the superheat degree of the flash evaporator tend to fall within the preset superheat degree range, and whether or not the superheat degree of return air of the air-source heat pump air heater system is within the preset superheat degree range is determined again. In this way, the air-source heat pump air heater system can work more efficiently while operating stably.

Description

technical field [0001] The present application relates to the technical field of heat exchange, and in particular to an air source heat pump fan and a refrigerant flow control method of the system thereof. Background technique [0002] Coal-burning pollution has had a huge impact on the formation of smog weather. In order to reduce coal-burning pollution in winter and improve air quality, many cities in northern my country have begun to promote the "coal-to-electricity" policy. With the implementation of the policy, coal-fired air-conditioning equipment is gradually being eliminated, and the air source heat pump fan is widely favored by the market due to its low investment cost and flexible installation. [0003] Conventional one-to-one air source heat pump heater products on the market have too complicated refrigerant flow control, and the heat pump heater is prone to vibration during use, resulting in system instability. At the same time, the development of heat pump heate...

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Problems solved by technology

[0003] Conventional one-to-one air-source heat pump heater products on the market have too complicated refrigerant flow control, and the heat pump heater is prone to vibration during use, resulting in system instability. At the same time, the development of heat pump heaters is also limited. It is impossible to develop a one-to-two air-source heat pump fan suitable for multiple rooms, which makes the cost of using a heat pump fan in multiple rooms too high

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