Heat pump air conditioning system

Abstract

The invention discloses a heat pump air-conditioning system, which comprises a compressor, a vaporization system, a condenser, a four-way change valve and a gas-liquid separator, wherein the condenser is communicated with the vaporization system through a refrigeration and heating exchange pipeline; the vaporization system comprises a high-temperature evaporator and a low-temperature evaporator which are connected in series with each other; the input end of the high-temperature evaporator is connected with the refrigeration and heating exchange pipeline; the gas-liquid separator 1 is arrangedbetween the high-temperature evaporator and the low-temperature evaporator; a refrigeration throttle valve 2 is arranged between the gas-liquid separator 1 and the low-temperature evaporator; a heating non-return valve is connected in parallel with the refrigeration throttle valve 2; an air outlet of the gas-liquid separator 1 is connected with an injector; and a suction inlet of the injector is connected with the refrigeration outlet end of the low-temperature evaporator, and an outlet of the injector is communicated with the four-way change valve through the gas-liquid separator. The heat pump air-conditioning system can greatly improve the refrigeration performance of a heat pump and the processing quality of indoor air, saves the energy, and is more economic and environment-friendly.

Description

technical field [0001] The invention relates to the field of heating, ventilating and air conditioning, in particular to a heat pump air conditioning system. Background technique [0002] In air conditioning engineering, indoor temperature and humidity are two important parameters that affect thermal comfort and need to be controlled. In the current air-conditioning project, the method of cooling is mainly used to reduce the temperature and dehumidify. The independent fresh air system is a new HVAC technology that has developed rapidly in recent years. In comfort air conditioning, sensible heat usually accounts for the main part of the load, while latent heat (humidity load) accounts for a minority. By treating the heat and humidity loads separately, the evaporation temperature of the refrigerator can be increased during operation, thereby improving the efficiency, while the humidity load can be borne by the fresh air that has been treated to a low humidity content, elimin...

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Problems solved by technology

[0004] In addition, the current heat pump technology mainly adopts the convective heat exchange method on the indoor use side. In summer, when the air conditioner is cooling, in order to maintain and control the indoor temperature and humidity, the cooling method is used to cool down and dehumidify the room so that it is in the thermal comfort zone of the human body. It is necessary to reduce the evaporation temperature of the heat pump, thereby affecting the performance of the heat pump, and the condensed water produced by cooling and dehumidification will also bring about indoor air quality problems and affect people's health; when heating in winter, the supply air temperature that meets the thermal comfort requirements of the human body should not be too low. As a result, the heat pump is required to maintain a high condensing temperature and pressure, which will also reduce its heating performance

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