Document pz6Zj9o5da55R2JJGYynvj5E

HEATING VENTILATING AIR CONDITIONING GUIDE 1942 only for persons having an average surface area of 19.5 sq ft or that of the average adult American male, 5 ft 8 in. in height and weighing 150 lb, and will therefore not apply to many audiences made up largely of women or younger persons. Fig. 5, taken from the work of Du Bois24 gives the relation of body surface area to height and weight, which may serve to correct the data for other audiences than adult men. The curves in the figures are based on certain averages of test results with different humidi ties, and are sufficiently accurate for most practical applications. Where j CHAPTER 2. PHYSIOLOGICAL PRINCIPLES ! i 5 6 f a iV i I Fig. 2. Relation Between Total Heat Loss from the Human Body and Effective Temperature for Still Air3 aCurve A--Persons working so as to have a metabolic rate of 1310 Btu per hour. Curve B--Persons working so as to have a metabolic rate of 850 Btu per hour. Curve C--Persons working so as to have a metabolic rate of 660 Btu per hour. Curve D--Persons seated at rest, or with a metabolic rate of 400 Btu per hour. Curves B and D based on test data covering a wide temperature range. Curves A and C based on lest data at an Effective Temperature of 70 deg and extrapolation of Curves B and D: AU'curves are averages of values for high and low relative humidities which apply with satisfactory accuracy for most considerations. For. specialproblems requiring a higher degree of accuracy see more detailed A.S.H.V.E. Research Laboratory reports. greater precision in the applications of the results is required, or for extreme variations in temperature and humidity, the reports25 covering the A.S.H.V.E. Laboratory work may be consulted. The curves in Figs. 2, 3 and 4, and proper interpolation between these curves make it possible to apply the data to persons engaged in any type .: . wDuBois, D. and E. F. {Archives of Internal Medicine, 1916, Vol. 18, p. 865). Loc. Cit. Note 11. T Fig. 4. Latent Heat and Moisture Loss from the Human Body by Evaporation,' in Relation to Dry-Bulb Temperature for Still Air Conditions3 -....... aLoci Cit. See footnote a, Fig. 2. 51