Low-temperature air energy heat pump unit applying flash evaporator air supplement circuit to remove frost

Abstract

The invention provides a low-temperature air energy heat pump unit applying a flash evaporator air supplement circuit to remove frost. The low-temperature air energy heat pump unit is mainly composedof a variable-frequency air supplement compressor, a user side heat exchanger, a air-cooled evaporator, a vapor-liquid separator, a flash evaporator, a four-way valve, an electronic expansion valve, adrying filter, a solenoid valve and all refrigerant pipelines for connecting the components. The problems that under a low temperature environment, the heating capacity of heating and preparing of domestic hot water of an ordinary heat pump is reduced sharply, and under the outdoor low temperature environment with the high relative air humidity, the ordinary heat pump is very prone to frosting, and consequently, the performance of the heat pump unit is affected seriously are mainly solved, and an air energy heat pump operates efficiently and stably for a long time at the low environment temperature.

Description

technical field [0001] The invention relates to the technical field of heating, ventilating and air conditioning, in particular to a low-temperature air-energy heat pump unit using a flash evaporator for defrosting an air supply circuit. Background technique [0002] In northern China, coal-fired heating is one of the main causes of winter smog and PM2.5 weather. In order to reduce heating smog in winter and effectively utilize clean energy, many provinces in northern China such as Beijing, Hebei, Tianjin, Henan, and Shanxi have successively promoted a series of policies such as "coal-to-electricity" and "coal-to-gas" in recent years. With the support and encouragement of various policies, air source heat pumps have achieved rapid development and ushered in a new period of development opportunities. The operating environment temperature of ordinary air source heat pump units is generally above 0°C. In areas with cold climates, ordinary air source heat pumps cannot operate n...

AI Technical Summary

Problems solved by technology

The operating ambient temperature of ordinary air source heat pump units is generally above 0°C. In areas with cold climates, ordinary air source heat pumps cannot operate normally.

Moreover, under the working conditions of heating and hot water production, since the outdoor side heat exchanger is placed outdoors, when the outdoor ambient temperature is low and the air contains a certain humidity, the outdoor heat exchanger is prone to frost, which will Seriously affect the performance of the unit, or even shut down

In order to solve the problem of frosting, some heat pumps are equipped with special defrosting devices, which will inevitably cause complex structure of the unit, increase costs, and at the same time, reduce the working efficiency of the heat pump

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