Document 3N2zX6pgKBk73Y4N4VQDV9Xx6

American Society of Heating and Ventilating Engineers Guide, 1936 between the effective.temperature for still air and for moving air, of any velocity, represents the cooling resulting from that air velocity. These charts apply to average normal and healthy persons adapted to American living and working conditions. They are limited to sedentary or light muscular activity, and to rooms heated by the usual American convection methods (warm air, central fan and direct hot water and steam heating Chapter 3--Ventilation and Air Conditioning Standards If an occupant of a room loses heat by radiation to large wall or glass surfaces at lower temperatures, the air within the room must be main tained at a higher temperature to compensate for this effect in order to give the same feeling of warmth. The results of a recent study18 by the A.S.H.V.E. Laboratory, shown in Fig. 4, indicate that in poorly insulated buildings this effect may become of considerable importance. Thus an occupant of a room having inside wall surface temperatures of 55 F on three sides will require an air temperature of 74 F to have the same feeling of warmth he would experience in a warm-wall room with air at 70 F. A systems) in which the difference between the air and wall surface tem peratures may not be great. The charts do not apply to rooms heated by radiant methods such as the British panel system', open coal fires, and the like. They will probably'not apply with adequate accuracy to races other than the white or perhaps to inhabitants of other countries where the living'conditions, climate, heating methods, and clothing are materially different from those' of the subjects employed in experiments at the Research Laboratory. 66 Fig. 4. Correction to Various Dry-Bulb Temperatures in a Warm-Wall Room for the Same Feeling of Warmth in Rooms Having Three Cold 'Walls! Temperatures Indicated by Shielded Thermometers 30 in. Above the Floor wall consisting of 8-in. brick and plaster, with 16 F outside air tempera ture and 70 F inside air temperature, will have an inside surface, tem perature of 55 F. The reverse effect will be experienced by occupants of rooms having extensive high-temperature surfaces in them. In such cases, a lower air temperature is required to compensate for heat radiated to the occupant. The effective temperature index for persons doing medium or heavy muscular work, in still air, has also been determined at the A.S.H.V.E. Research Laboratory19. OPTIMUM AIR CONDITIONS No single comfort standard can be laid down which would meet every heed. There is an inherent individual variation in the sensation of, .. CoW Walls and Their Relation to the Feeling of Warmth, by F. C. Houghten and Paul McDermott IA.S.H.V.E. Journal Section, Heating, Pipring and Air Conditioning, January. 1933. p. 53). ... Temperature for Persons Lightly Clothed and Working in Still Air, by F. C. Houghten. W. W. Teague abd W. E. Miller (A.S.H.V.E. Transactions, Vol. 32, 1926). 67