Carbon dioxide trans-critical cycling exhaust air heat recovery fresh air air conditioning unit and control method thereof

Abstract

The invention relates to a carbon dioxide trans-critical cycling exhaust air heat recovery fresh air air conditioning unit and a control method thereof. The carbon dioxide trans-critical cycling exhaust air heat recovery fresh air air conditioning unit comprises an air supply heat exchanger, an exhaust air heat exchanger, a compressor, a first throttling device, a second throttling device, a gas-liquid separator, a reheater, a four-way reversing valve, a refrigerant connecting pipe, an air supply fan, an exhaust air fan, a fresh air opening, an air supply opening, an air return opening, an exhaust opening and an air pipe and uses carbon dioxide as a cycling refrigerant. The first throttling device is fully opened in a refrigerating working condition, ensures that the reheater can cool therefrigerant at an outlet of an air cooling device, normally works under a heating working condition and is used for controlling system high pressure. The second throttling device is fully opened in the heating working condition, ensures that the reheater can cool the refrigerant at the outlet of the air cooling device, normally works under the refrigerating working condition, and is used for controlling system high pressure. The air conditioning unit conforms with the future development tendency of an environment-friendly working medium and at the same time increases the cycling efficiency ofthe system.

Description

technical field [0001] The invention relates to an air conditioner unit, in particular to an exhaust air heat recovery fresh air air conditioner unit with carbon dioxide transcritical cycle and a control method thereof. Background technique [0002] With the continuous improvement of people's requirements for indoor air quality, the use of fresh air air conditioning units is becoming more and more extensive. The fresh air air conditioner unit is an effective air purification equipment. On the one hand, the indoor dirty air is discharged outside, and on the other hand, the fresh outdoor air is filtered and heat-humidified, and then input into the room. However, if the exhaust air heat recovery technology is not used, the heat and humidity treatment of fresh air will consume a lot of energy. [0003] The heat pump exhaust air heat recovery fresh air air conditioning unit that has emerged in recent years is a new type of active exhaust heat recovery technology. It uses limited...

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN 104019513A proposes a heat pump type fresh air ventilation unit, which can realize cooling and dehumidification and heat recovery, has high filtration efficiency, and can provide comfortable air with high oxygen content, but the system does not use a regenerator or gas-liquid separation It is not suitable for carbon dioxide system; Chinese patent CN 106671741A proposes a carbon dioxide transcritical refrigeration cycle automobile air conditioning system, which can improve the energy efficiency of the system by recovering engine waste heat to drive vapor compression to assist supercooled carbon dioxide transcritical refrigeration cycle. Refrigeration, not heating; Chinese patent CN 106440115A proposes an air temperature and humidity adjustment system with transcritical carbon dioxide and solution dehumidification, which can independently control the temperature and humidity of the refrigeration heat pump system while using carbon dioxide transcritical cycle, but can only achieve Cooling and dehumidification of fresh air, but cannot heat fresh air

Images