System capable of improving energy efficiency of low-temperature air energy heat pump and control method

Abstract

The invention discloses a system capable of improving energy efficiency of a low-temperature air energy heat pump and a control method. The system comprises a circulating refrigerant flow path which consists of a compressor, an electromagnetic four-way reversing valve, a water side heat exchanger, a liquid storage, a first filter, an economizer, a second filter, a wind side heat exchanger, an electromagnetic four-way reversing valve and a gas-liquid separator which are sequentially in communication, wherein the first filter is divided into two pipelines through a three-way tube; one pipeline is directly accessed to a Z1 interface of the economizer, and a Z2 interface of the economizer is accessed out, a culvert-increasing electronic expansion valve is arranged on the other pipeline which is connected to a Z3 interface of the economizer, and a Z4 interface of the economizer communicates with the compressor through a second gas suction hole; after being accessed out, the Z2 interface isdivided into two pipelines through a three-way tube, a main path electronic expansion valve is horizontally arranged on one pipeline which communicates with the second filter; and an electromagnetic valve and a capillary tube are sequentially arranged on the other pipeline, and the other pipeline communicates with the second filter. The system is reliable in operation and is strong in heating.

Description

technical field [0001] The invention relates to the technical field of air conditioning and heating, and in particular to a system for improving the energy efficiency of a low-temperature air source heat pump, a control method and a control method. Background technique [0002] The job of the air conditioner is refrigeration. According to the principle of refrigeration, the four-way valve is used to realize the heating effect of the air conditioner in reverse; when the air conditioner is heating in winter, the indoor heat exchanger is at high pressure, the outdoor heat exchanger is at low pressure, high temperature and high pressure After exchanging heat in the indoor heat exchanger, the refrigerant is throttled into a low-pressure gas-liquid two-phase through the throttle valve and enters the outdoor heat exchanger, where it absorbs heat from the outdoor environment and evaporates; although the air conditioning system in the prior art can produce heat, Weak heating capacity...

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Problems solved by technology

[0002] The job of the air conditioner is refrigeration. According to the principle of refrigeration, the four-way valve is used to realize the heating effect of the air conditioner in reverse; when the air conditioner is heating in winter, the indoor heat exchanger is at high pressure, the outdoor heat exchanger is at low pressure, high temperature and high pressure After exchanging heat in the indoor heat exchanger, the refrigerant is throttled into a low-pressure gas-liquid two-phase through the throttle valve and enters the outdoor heat exchanger, where it absorbs heat from the outdoor environment and evaporates; although the air conditioning system in the prior art can produce heat, Weak heating capacity of air conditioners has always been one of the most common complaints of consumers about air conditioners. The poor heating effect of traditional air conditioners in winter is mainly caused by the external environment and the insufficient heating capacity of small compressors; when the outdoor temperature is low, The heating performance of the air conditioner will further decline. If the frost is serious, it needs to defrost regularly. The better the condensation effect in the medium, the greater the subcooling degree, the better the evaporation effect when it enters the outdoor heat exchanger after throttling, and the more conducive to heating; in order to achieve this purpose, the commonly used methods in the prior art are as follows: Increase the indoor heat exchanger, increase the indoor air volume or increase the outdoor heat exchanger, but these methods have obvious disadvantages such as increased cost, excessive power consumption, and poor noise control.

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