Document Vj77bb28j5e7Emo14X2dN0x4q

American Society of Heating and Ventilating Engineers Guide, 1936 Fig. 10. Latent Heat and Moisture Loss from the Human Body by Evaporation in Relation to Dry-Bulb Temperature for Still Air Conditions21 Curve A--Men working 66,150 ft-lb per hour. Curve B--Men working 33,075 ft-lb per hour. Curve O--Men working 16,538 ft-lb per hour. Curve D--Men seated at rest. Curves A and C drawn from data at a dry-bulb temperature of 81.3 F only and extrapolating the relation between Curves B and D which were drawn from data at many temperatures. *N * 5s S s u i` fe * .ffl-- mi m mu mi 6S" 70 " CRY BULB TEMPERATURE "FAHR. Fig. 11. Heat Loss from the Human Body by Evaporation, Radiation and Con vection in Relation to Dry-Bulb Temperature for Still Air Conditions2 Curve A--Men working 66,150 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 a dry-bulb temperature of 81.3 Fonly and extrapolating the relation between Curves Band D which were drawn from data at many temperatures. 84 Chapter 3---Ventilation and Air Conditioning Standards Although heat and moisture from the human body constitute the major portion of the cooling load, in most cases where air conditioning is pro vided for comfort and health other factors must also be considered. These include heat from lights, machinery, and processes, as well as the trans mission and infiltration of heat through the building structure. The computations for these factors, may be made in accordance with data given in Chapters 5 and 7. Table 4. Condition of Sensible Perspiration for Persons Seated at Rest Under Various Atmospheric Conditions4 Degree of Perspiration Atmospheric Condition 95 Per Cent Relative Humidity 20 Per Cent Relative Humidity Forehead clammy........................ ----- --------Body clammy..--......... ............. . ............... Body damp.................. -............ ....... ............ Beads on forehead............................... ......... Body wet---------- -----------------------------------Perspiration on forehead runs and drips.__ Perspiration runs down body____________ E. T. 73.0 73.0 79.0 80.0 84.5 88.0 88.5 D. B. 73.6 73.6 79.7 80.8 85.4 89.0 89.5 W. B. 72.4 72.4 78.4 79.4 84.0 87.6 88.1 E. T. D. B W. B. 75.0 75.0 81.0 87.0 86.5 94.0 90.0 87.0 87.0 97.5 109.4 108.5 125.2 116.0 60.7 60.7 67.5 75.2 74.6 85.4 79.5 `Forty per cent of subjects registered degree of perspiration equal to or greater than indicated. Table 5. Condition of Sensible Perspiration for Persons at Work Under Various Atmospheric Conditions Atmospheric Condition Degree or Perspiration 95 Per Cent Relative ; 20 Per Cent Relative Humidity Humidity E. T. D. B. W. B. E. T. D.B. W.B. Forehead clammy............. ........ ........ .....-......... 59.0 59.4 58.3 69.5 80.5 56.5 Body clammy 50.0 50.2 49.3 57.0 61.6 44.2 Body damp..... ................... ............................... 60.0 60.3 59.3 62.5 69.6 49.5 Beads on forehead-- -- _............... ..... 68.0 68.5 67.5 76.0 91.0 63.4 Body wet.. --_ .................... 69.0 69.6 68.5 71.0 82.8 53.0 Perspiration on forehead runs and drips.------ 78.5 79.3 78.0 82.0 100.5 70.2 Perspiration runs down body- ... ............ 79.0 79.8 78.5 81.0 99.8 69.0 Forty per cent of subjects registered degree of perspiration equal to or greater than indicated. In many cases, allowance must also be made for sun effect and for heat capacity of the building structure in accordance with studies by the A.S.H.V.E. Research Laboratory87. Another item,to be considered is the radiant heat received by the body from high temperature wall and ceiling surfaces. 'Heat Transmission as Influenced by Heat Capacity and Solar Radiation, by F. C. Houghten, J. L. Blackshaw, E. M. Pugh,-and Paid McDermott (A.S.H.V.E. Transactions, Vol. 38, 1932). 85