However, this is representative of the typical mechanical air-conditioning process. This may seem like a roundabout and inefficient process. As the the air-vapor mix is reheated, the condition moves horizontally to the right on the chart ( Figure 6). In order to lower the relative humidity, or to bring the conditions into the human thermal comfort zone, sensible heat will need to be added while the moisture content (latent heat) is maintained. This is the dew point-the critical temperature at which condensation occurs as the dry-bulb temperature of an air-vapor mix is lowered.Īfter being cooled beyond the dew point temperature, the humidity ratio of the air-vapor mix will be reduced and the air will remain at 100 percent relative humidity. water) starts to form on the cool window surface. As the temperature of the air adjacent to this surface is pulled beyond the saturation line, its limit for holding moisture is reached and 'dew' (i.e. An example of this condensation occurrence would be when hot-humid indoor air comes into contact with a cool window surface during the winter.
