Document 7R1y5ak44Er10zNMN6VBadNBR

American Society of Heating and Ventilating Engineers Guide, 1935 Table 3. Relation Between Metabolic Rate and Activity" Activity Metabolic Rate Btd per Hour roa Average Man (19.5 Sq Ft Sur face Area) Authority Seated at rest- ....... Standing at rest............ Walking 2 mph............. 384 431 761 Walking 3 mph..... ....... Walking 4 mph....... 1049 1388 Walking 5 mph..... ....... Slow run.......................... Very severe exercise.... Maximum exertion...... Tailor............................... Bookbinder..................... Shoemaker.................... Carpenter........................ Metal worker................ Painter (of furniture).. Stonemason...... ............. Man sawing wood........ 2530 2285 2555 3333 to 4762+ 482 626 661 762 to 963 . 862 876 1488 1797 Research Laboratory, American Society of Heating and Ventilating Engineers. Research Laboratory, American Society of Heating and Ventilating Engineers. Average values from Douglas, Haldane; Henderson and Schneider; and Henderson and Haggard. Douglas, Haldane, Henderson and Schneider Average values from Douglas, Haldane, Henderson and Schneider; and Henderson and Haggard. Douglas, Haldane, Henderson and Schneider Henderson and Haggard Benedict and Carpenter Henderson and Haggard Becker and Hamalainen Becker and Hamalainen Becker and Hamalainen Becker and Hamalainen Becker and Hamalainen . Becker and Hamalainen Becker and Hamalainen Becker and Hamalainen means. It is true that many suggestions have been advanced :to account for the stimulating quality of outdoor air, such as ultra-violet light and ionization. At the present time neither of these suggestions has received any degree of scientific confirmation. It is generally recognized that total outdoor solar radiation has marked curative value in certain diseases and is also a powerful germicidal agent. A critical review of the literature, however, does not substantiate the theory that ultra-violet radiation is of importance in air conditioning, since the use of ultra-violet sources fails to . produce indoors, the pre viously mentioned stimulating qualities found in outdoor air. . Experiments35 show that in occupied rooms there is a.marked decrease in both positive and negative small ions. As shown in Fig. 5, soon after the occupants assembled the ionic content fell abruptly to a very low level which was maintained until the occupants left the room. Both positive a.nd negative ions began to rise again as soon as the occupants departed. The effects of the decrease in the ionic content of indoor air on comfort and health have not yet been subjected to sufficient scientific investiga tion. It would appear, however, from the evidence at hand, that comfort is not associated with a high ion content--but this must be considered, at least for the time being, as still a subject for further study. "A.S.H.V.E. research paper entitled Changes in Ionic Content in Occupied Rooms, Ventilated by Natural and Mechanical Methods, by. C. P. Yaglou, L. C. Benjamin and S. P. Choate (A.S.H.V.E. Trans actions, Vol. 37, 1931). Physiologic Changes'During Exposure to Ionized Air, by C. P. Yaglou, A. D. Brandt and L. C. Benjamin (A.S.H.V.E. Journal Section, Heating, Piping and Air Conditioning, August. 1933) . Diurnal and Seasonal Variations in the Small Ion Content of Outdoor and Indoor Air, by C.' P. Yaglou and L. C. Benjamin, (A.S.H.V.E. Journal Section, Heating. Piping and Air Conditioning. January. 1934) . The Nature of Ions in Air and their Possible Physiological Effects, L. B. Loeb (A.S.H.V.E. Journal Section, Heating, Piping and Air Conditioning, October, 1934). 56 HEAT AND MOISTURE LOSSES In order to solve air conditioning problems involving the human body it is necessary to know the rate at which sensible and latent heat are given up by the body under various conditions of temperatue and activity. Research at the A.S.H.V.E. Laboratory 32- 56 has resulted in the data given in Figs. 7, 8, and 9. Table 3 gives the metabolic rates for various degrees of Tahcetiveitxyp.erimental data from which the curves were drawn show that ----------------- - i-i i n EFFECTIVE TEMPERATURE FAHR. Fig. 6. Relation Between Total Heat Loss from the Human Body and Effective Temperature for Still AiRa Curve A---Men working 66,160 ft-lb per hour. Curve B-- Men working 33,075 ft-lb per hour. Curve C--Men working 16.538 ft-lb per hour. Curve D--Men seated at rest. Curves A and C drawn from data at an effective temperature of 70 deg only and extrapolating the relation between curves B and D, which were drawn from data at many temperatures. total heat loss does not vary appreciably within the comfort zone (see Fig. 6). Above or below this range the variation is approximately a function of effective temperature. Sensible and latent heat losses (Figs. 7 and 9) on the other hand, vary greatly within the comfort zone, the variation following closely the dry-bulb temperature. Although total heat loss and sensible and latent heat losses are not exact functions of effective and dry-bulb temperature, respectively,' for all "Thermal Exchanges Between the Bodies of Men Working and the Atmospheric Environment, by F. C. Houghten, W. W. Teague. W. E. Miller, and W. P. Yant (American Journal of Hygiene, Yol.; XIII, No. 2, March, 1931, pp. 415-431). " ............