ABSTRACT
Humid air can thus be considered to be formed of dry air unlikely to condense in the conditions of temperature and pressure considered, and water vapor likely to condense in liquid or ice. As both dry air and water are ideal gases, the total pressure is equal to the sum of the partial pressures: this is the Dalton’s law. The saturation moisture content thus increases with temperature along the saturation curve. The relative humidity is the ratio of the actual water vapor pressure to the saturation water vapor pressure at the prevailing temperature. In dew formation, the dew-point depression temperature with respect to ambient air temperature is a key parameter as it determines the heat loss during condensation. In particular, if the moisture content of the inlet air is lower than the moisture content of the saturated air at the outlet conditions, water production is impossible and the moisture harvesting index is set to zero.
