Document QzoXgm60m1aEndEGDQm191kE

American Society of Heating and Ventilating Engineers Guidb, 1937 I 60*0-0 <U tQ3 cl | *ssf w !! oo wjf'g ts*l* SSSUg3a"*oAaijsgUQSUS.>apyUco*,wW-t; SMatQil-u9^sa JL,Sfr" s2*g3c=?."-a=85 =.3j'-S' -^eo jl.gi: <J t3S-o35gS|ss Chapter 3- -Physical and Physiological Principles of Air Conditioning Table 6. Degrees of Perspiration for Persons at Work Under Various Atmospheric Conditions Work Rate 83,000 Ft Lb per Hour Atmospheric Condition Degree op Perspiration* 95 Per Cent Relative | 20 Per Cent Relative Humidity g Humidity E.T. D.B. W.B. E. t. D.B. W.B. Forehead clammy----------------------------------------- Body clammy----------------------------------------------Body damp-------------------------------------------------Beads on forehead---------------------------------------- Body wet----------------- -------------------------------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 57.0 62.5 76.0 71.0 82.0 81.0 80.5 61.6 69.6 91.0 82.8 100.5 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. 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. NATURAL AND MECHANICAL VENTILATION Under favorable conditions natural ventilation methods properly com bined with means for heating may be sufficient to provide for the fore going objectives in homes, uncrowded offices, small stores, etc. In large offices, large school rooms, and in public and industrial build ings, natural ventilation is uncertain and makes heating difficult. The chief disadvantage of natural methods is the lack of control; they depend largely on weather and upon the velocity and direction of the wind. Rooms on the windward side of a building may be difficult to heat and ventilate on account of drafts, while rooms on the leeward side may not r oC-San,ges *? ISmc Content in Occupied Rooms, Ventilated by Natural and Mechanical Methods, by ri,, Yag'ou: L- C, Benjamin and S. P. Choate (A.S.H.V.E. Transactions, Vol. 37, 1931). Physiologic TS."lni>unng,?fP"ure 40 Ionized Air. by c. P. Yaglou. A. D. Brandt and L. C. Beniamin (A.S.ILV.E. 1 ndr^rAA3v 1?33b PImI2al and Seasonal Variations in the Small Ion Content of Outdoor and A? ; l55' Cj ElYaglou and L. C. Benjamin (A.S.H.V.E. 1 ransactions, Vol. 40. 1934). The Nature l<mi ti, , aJd Tbeir Possible Physiological Effects, by L. B. Loeb (A.S.H.V.E. Transactions, Vol. 40, ,, ,A"!'uenc,e,,SLIoriz,ed Air upon Normal Subjects, by L. P..Herrington (Journal Clinical Imesti- Growfh i I 'K'V T ,": Effect of High Concentrations of Light Negative Atmospheric Ions on the v'STM,o,Tlt0[.the.Alblno Rat, by L. P. Herrington and Karl L. Smith (Journal Ini. Hygiene, 17, bv c it a ,lr Subjective Reactions of Human Beings to Certain Outdoor Atmospheric Conditions. S:,i No!S' 1935L Herringtn <A S H-V E- Journal Section, Heating. Piping and Air Con- 79 A