关键词: 新风, 空调, 冷负荷, 节能, 焓湿图

Abstract: The fresh air function not only conveys outdoor fresh air into the indoor, but also participates in regulating the indoor temperature and humidity. The control mode of fresh air load should consider not only the temperature condition, but also the influence of humidity. Based on the theoretical derivation and the literature, the formulas for approximate calculation of moisture content, specific enthalpy, fresh air cooling load, sensible heat and latent heat are found. Innovatively, it is based on the isotherms, constant humidity lines (or isohumes), and constant enthalpy lines in the psychrometric chart as the basis., this study takes six possible outdoor air relative working conditions corresponding to a certain indoor air state in summer as examples, conducts a sample calculation of the fresh air cooling load, and further infers the impact of fresh air on the indoor air temperature, humidity, and enthalpy value. It makes the automatic control of sampling temperature and humidity for the energy-saving operation of fresh air possible.

Key words: Fresh air, Air-conditioner, Cooling load, Energy-saving, Enthalpy-humidity diagram