Thermal and non-Thermal Effects of Humidity on Comfort

Abstract

Humidity affects comfort in a number of ways both directly and indirectly. It is a factor in our energy balance, thermal sensation, skin moisture, discomfort, sensation of fabrics, health and perception of air quality. Reduced humidity in summer makes us feel cooler at the same temperature, our skin feels drier and less sticky, fabrics and clothing feel smoother and more pleasant to our touch and the air is perceived to be fresher. Much of the discomfort related to higher humidities appears to be due the higher levels of skin moisture, thus increased air speed alone is often effective in such environments. Further, the comfort and related benefits perceived by occupants and customers from humidity reduction may encourage and justify the design and implementation of HVAC systems with increased dehumidification capabilities such as Cold Air /Ice Storage systems.