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Sweating from the skin occurs only when the surrounding temperature is moderately high. However, water evaporation from the respiratory passages and lungs occurs uninterruptedly. © Woodhead Publishing Limited, 2011 18 Improving comfort in clothing This can be observed when breathing, by exhaling in frosty weather. We generally exhale saturated (100% RH) air, and even at rest, the body requires about 100 Btuh (30 W) of heat to evaporate this moisture from the lungs into the inhaled air. The evaporative heat loss from our lungs and skin plays an important role in disposing of body heat.
The rate of heat production within the body © Woodhead Publishing Limited, 2011 Factors affecting comfort 9 is known as the metabolic rate and includes all of the heat given off by all of the chemical reactions taking place in the body. The metabolic rates are the heat released from the body per unit skin area expressed in met units. A met is the average amount of heat produced by a sedentary man, and any metabolic rate can be expressed in multiples of this standard unit. 7 m2. 2 or 100 W (approximately) = 360 Btuh = 90 kcal/hr.
Thus, not only good, properly operated heating and cooling equipment are important for maintaining comfort, but the building construction itself can also have a strong influence. © Woodhead Publishing Limited, 2011 16 Improving comfort in clothing Poorly insulated walls and windows should be flagged as comfort problems. Furthermore, the type of occupancy must be borne in mind when analysing the intended comfort conditions. Convection Convection is the process of carrying heat stored in a particle of the fluid into another location.