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• From American Society of Heating, Refrigeration <br />and Air Conditioning Engineers (ASHRAE) Standards <br />Thermal comfort is that condition of mind that expresses satisfaction with the thermal <br />environment. There are large variations, both physiologically and psychologically, from <br />person to person, which makes it difficult to satisfy everybody in a space. The <br />environmental conditions required for comfort are not the same for everyone. However, <br />extensive laboratory and field data have been collected that provide the necessary <br />statistical data to define conditions that a specified percentage of occupants will find <br />thermally comfortable. <br />DisplayText cannot span more than one line! <br />This standard specifies the combinations of indoor space environment and personal <br />factors that will produce thermal environmental conditions acceptable to 80% or more of <br />the occupants within a space. The environmental factors addressed are temperature, <br />thermal radiation, humidity, and air speed; the personal factors are those of activity and <br />clothing. <br />DisplayText cannot span more than one line! <br />ASHRAE Standard 55-1992 Thermal Environmental Conditions for Human Occupancy, recommends the <br />following acceptable temperature ranges at relative humidity (1ZH) of 50% and air speed <br />less than 0.15 mJsec. (30 fpm). <br />_ .~.~., <br />Acceptable Temperatures <br />Season Clothing Temperature <br />Winter ~ eavy slacks, long sleeve shirt and/or 20-23.5°C <br />sweater (68-75°F) <br />Summer Light slacks and short sleeve shirt 23-26°C <br />3 (73-79°F) <br />htto://www.ccohs.ca/oshanswers/ohys agents/hot coid.html <br /> <br />