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Heating Ventilating Air Conditioning Guide 1939 H2 as xs ta . Sin 3ja Z CQ W ,* c/) >* 2QS ww ro; j j & 2P fmflg>. o^ ZCQ ** 22 H< <s "5 P'S W .a CJ H .s oo Cx- {0*6 fc*8go osl^l a I *;> "'',S -oc ^3-0 5 x>o * g *--7 .set av i5 O f5ec3 SV i *aQI lai: x> Jd--V C3*M0 C< So *; ohrt2 IsNi c g~ V s!l 72 Chapter 3. Physical & Physiological Principles of Air Conditioning Table 6. Degrees of Perspiration for Persons at Work Under Various Atmospheric Conditions Work Rate 33,000 Ft Lb per Hour Atmospheric Condition Dxghs* or Pbbspibation* 95 Per Ceat Relative Humidity 20 Per Cent Relative Humidity E.T. D.B. W. B. RT. D. B. W. B. Forehead clammy---------- ----------------------------------Body clammy---------------------------------------------------------- Beads on forehead-------------------------------------------------- Perspiration on forehead runs and drips.---- Perspiration runs down body--.---------------- 59.0 50.0 60.0 68.0 69.0 78.5 79.0 59.4 50.2 60.3 68.5 69.6 79.3 79.8 58.3 49:3 59.3 67.5 68.5 78.0 78.5 69.5 80.5 57.0 61.6 62.5 69.6 76.0 91.0 71.0 82.8 82.0 100.5 81.0 99.8 56.5 44.2 49.5 63.4 53.0 70.2 69.0 Forty per cent of subjects registered degree of perspiration equal to or greater than indicated. supply, which can be obtained more conveniently from the increase in moisture content of the ventilating current. i HEAT AND MOISTURE GIVEN UP BY HUMAN BODY In conditioning air for comfort and health it is necessary to know the rate of sensible and latent heat liberation, from the human body, which in conjunction with other heat loads (see Chapters 5 and 7) determine the capacity of the conditioner. The data in common use are those of the A-S.H.V.E. Research Laboratory46 shown in Figs. 8, 9, 10 and 11. Other useful data are given in Tables 4, 5 and 6, which are self-explanatory. ULTRA-VIOLET RADIATION AND IONIZATION In spite of the rapid advances in the field of air conditioning during the past few years, the secret of reproducing indoor atmospheres of as stimulating qualities as those existing outdoors under ideal weather con ditions, has not as yet been found. Extensive studies have failed to elucidate the cause of the stimulating quality of country air, qualities which are lost when such air is brought indoors and particularly when it is handled by mechanical means. Ultra-violet light and ionization have been suggested but the evidence so far is inconclusive or negative47. Hn.*.!X^ernlfir^f,c,SngM March lM^ ^' !he. Bodies of Men Working and the Atmospheric Environment, by F. C. " a"d W- R Yant Journot of Hygiene, Vol. XIII. No. 2. Natura?'H*y'w ^ESEARp" Rkport No. 921--Changes in Ionic Content in Occupied Rooms, Ventilated by ACTIONS Vol oaS1Cal, n,e,tho?s; "S' C. p. Yaglou. L' C- Benjamin and S. P. Choate (A.S.H.V.E. Trans- DOTuSTA\oni?2i a9-32,sP' j.91n A.S. H.V.E. Research Report No. 965--Physiologic Changes During Ex- 39 1933 ky.9;^-Yaglou. A. D. Brandt and L. C. Benjamin (A.S.H.V.E. Transactions. Vol. Content* nr rwj A-S.H.V.E. Research Report No. 985--Diurnal and Seasonal Variations in the Small Ion Vol 40 iQ3?H>doS^"iJnl?0r Au%,by C- p- Yalou and L- C. Benjamin (A.S.H.V.E. Transactions, (A.S H V f L p Hprrin of and Karl fJa,tuJ,e ,f*ns *n Air and Their Possible Physiological Effects, by L. B. Loeb CT ON;S/'r41,1935,p. 101). ,The Influence of Ionized Air upon Normal Subjects, by Inveslijatton, 14. January. 1935). The Effect of High Concentrations At..mosphenc Ions on the Growth and Activity of the Albino Rat. by L. P. Herrington to Certain {"4 Hy&itnc 17. November. 1935). Subjective Reactions of Human Beings Vd m? pnC119) IOnS* y ` A` WinSl0W and L* P- H^ngton (A.S.H.V.E. 73