Document JNQqX8raDYXdbG5QmL7gLyOQe

American Society of Heating and Ventilating Engineers Guide, 1934" greatest curative and is a powerful germicidal agent. A critical review of the literature, however, discloses that artificial ultra-violet radiation has little importance in air conditioning, at least for the time being, because it is not known which of the solar rays brings about the cure, and what physiologic processes are involved in their action. With the exception of rickets and certain skin diseases, artificial radiation was found to have no effect on susceptibility, incidence, and resistance to respiratory infections33, no permanent effects on blood and no effect on the general metabolism of human beings. Ionization, on the other hand, seems to offer a fruitful field for research. Fig. 3. Influence of Room Occupancy on Ionic Content1* (Cubical Contents of Room, 10,000 Cu Ft; Number of Occupants, 34) Recent experiments3* show that in occupied rooms there is a marked decrease in both positive and negative small ions.- As shown in Fig. 3, 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 and negative ions began to rise again as soon as the occu pants departed. The problem now is to determine whether such altera tions in the electrical quality of air have any significant bearing on com fort and health. If this proves to be the case, some artificial source of ionization may be desirable in occupied rooms. "Light--Its Photodynamic Activity and Use as a Therapeutic Agent, by F. W. Schulte. K. W. Stenstrom and E. M. Clausen (Report of the White House Conference on Child Health and Protection, Washington. February, 1931). "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, Healing, 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, Healing, Piping and Air Conditioning, January 40 Chapter 2--Ventilation and Air Conditioning Standards 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 temperature and activity. Research at the A.S.H.V.E. Laboratory35 has resulted in the data given in Figs. 4, 5, 6 arid 7. Table 3 gives the metabolic rates for various degrees of activity. The experimental data from which the curves were drawn indicate that Table 3. Relation Between Metabolic Rate and Activity*5 ACTIVITY BMetabolic Rate tu feb Houb fob Average Man (19.S Sq Ft Sur face Area) Seated at rest.............. - 384 Standing at rest.--....... 431 Walking 2 mph............. 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.................... Main sawing wood........ 2530 2285 2555 3333 to 4762 + 482 626 661 762 to 963 862 876 1488 1797 Authority 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 total heat loss does not vary appreciably within the comfort zone range (see Fig. 4). Above or below this range the variation seems to be approxi mately a function of effective temperature. Sensible and latent heat losses (Figs. 5 and 7) on the other hand, vary greatly within the comfort zone range, the variation following more closely the dry-bulb temperature than any other factor. Although total heat loss and sensible and latent heat losses are not exact functions of effective and dry-bulb temperature, respectively, for all conditions of humidity and air motion, they are plotted as such in the curves. This is accomplished by approximations which are sufficiently accurate for application to practical problems. An atmospheric condition resulting in sensible perspiration is to be "See A.S.H.V.E. research paper entitledH eat and Moisture Losses from Men at Work and Application to Air Conditioning Problems, by F. C. Houghten, W. W. Teague, W. E. Miller and W. P. Yant (A.S.H.V.E. Transactions, Vol. 37, 1931). 41