All-working-condition efficient fresh air ventilator for multi-stage heat pump heat recovery

Abstract

The invention relates to an all-working-condition efficient fresh air ventilator for multi-stage heat pump heat recovery. The ventilator comprises a first air duct and a second air duct, and further comprises a multi-stage nested refrigerant loop, wherein the multi-stage nested refrigerant loop forms a temperature gradient on the evaporation side, bears more fresh air heat loads at a high evaporation temperature and bears more fresh air wet loads at a low evaporation temperature, therefore load gradient change distribution is formed; and the multi-stage nested refrigerant loop forms a temperature gradient on the condensation side, and a gradient condensation temperature matches the slippage of a return air temperature, so that a pressure ratio of each stage of refrigerant steam compressioncycle is reduced. Compared with the prior art, a multi-stage heat pump heat recovery cycle is arranged, so that the pressure ratio of each stage of refrigerant steam compression cycle is reduced, thepower consumption of a compressor is reduced, and the system energy efficiency can be effectively improved; and pertinence and comprehensiveness matching can be carried out on annual working conditions, and multiple modes of refrigeration and dehumidification in summer, heating in winter and internal circulation in transition seasons can be achieved.

Description

technical field

[0001] The invention relates to an integral fresh air blower, in particular to a high-efficiency fresh air blower in all working conditions with multi-stage heat pump heat recovery. Background technique

[0002] Many modern commercial and residential buildings have begun to introduce fresh air air conditioning systems to improve indoor air quality. The fresh air dehumidifier bears all the indoor humidity load and part of the heat load, and is often used in conjunction with indoor sensible heat treatment equipment (such as radiant air conditioning systems). The traditional fresh air dehumidifier adopts a single-stage heat pump heat recovery cycle (for the system structure, refer to figure 1 ), the refrigerant evaporates and absorbs heat in the evaporator, cooling the passing fresh air to the dew point, and then condensing the water vapor in it to achieve the purpose of dehumidification. At this time, the evaporation temperature of the refrigerant is lower tha...

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