how heat transferred by phase change will affect the human comfort
Perhaps this is where a chemist can help. The heat of evaporation (as water changes from liquid to gas) will cool the surface from which the water is evaporating. Perspiration cools the skin by this process. Of course if you are in a cold climate and are wet, the evaporation may cool the body dangerously. As you may know, phase change is the basis of air conditioning and refrigeration units. From Wikipedia: The refrigerant cycle consists of four essential elements to create a cooling effect. The system refrigerant starts its cycle in a gaseous state. The compressor pumps the refrigerant gas up to a high pressure and temperature. From there it enters a heat exchanger (sometimes called a condensing coil) where it loses energy (heat) to the outside. In the process the refrigerant condenses into a liquid. The liquid refrigerant is returned indoors to another heat exchanger (evaporating coil). A metering device allows the liquid to flow in at a low pressure at the proper rate. As the liquid refrigerant evaporates it aborbs energy (heat) from the inside air, returns to the compressor, and the cycle repeats. In the process, heat is absorbed from indoors, and transferred outdoors, resulting in cooling of the building.
