Heating, Ventilating, Air Conditioning Guide Volume 1
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...be found as S = 0.6221 + 0.001815 l/e + 0.00000511/7 (8) The relationship between the temperature and specific weight of vapor is shown by the diagram on this page taken from W. H. Carrier's paper on "Rational Psychrometric Formulae." An approximate value for the weight of water vapor contained in one pound of dry air saturated with moisture may be determined from 0.624 e (9) b--e It may be noted from the curve that the value of 0.624 for S in the above is only correct at about 70. l00 10 t4Q 60 ftO (00 170 WO ZtO 80 Fig. 1 Specific Weight of Water Vapor The table No. 1 gives the properties of dry air for various temperatures, and the table No. 2 the properties of saturated air. These are both based on the standard barometric pressure of 29.921 inches. The table No. 3 giving the weights of saturated and partly saturated air for various barometric and hygrometric conditions will be found especially convenient in making calculations based on other than standard conditions. The weight in pounds per cubic foot of saturated air is given for even barometric pressures and temperatures. The decrement per degree rise in temperature and the increment per 0.1" increase in barometer are also given, thus readily giving the weight of saturated air at any other temperature and pressure. The last column in the table gives the approximate average increment per degree wetbulb depression which is to be added to the weight of saturated air to obtain the corresponding weight of partly saturated air. "Rational Psychrometric Formulae," Am. Soc. Mech, Engrs., Dec, 1911. Table No. 2 PROPERTIES OF SATURATED AIR Weights of Air, Vapor of Water, and Saturated Mixture of Air and Vapor at Different Temperatures, Under Standard Atmospheric...
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- 28 Jun 2012
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