Ashrae Journal - October 2008 - (Page 60) 100th Anniversary 200 XI ity – D Dens 175 c Vo lume – Spec ifi 150 % 25 Degrees Fahrenheit (°F) Sp ent Perc ific age H umid Vo l ity um e– Sa tu ra te d Ai 5% Hum id H eat Dry A ir XI I ec Line s of oling t Co stan Con ry Air r m e– 1 S lb. atu r ate d r Ai XII I n De sit y– tur Sa d ate A ir VII 125 VII 50 % I Hu m id lu Vo 100 100 % La te H nt ea to fS 75 Humidity Chart Reduced & Traced from 48 in. x 20 in. Photocopy Copyright 2008 by Donald P Gatley . 50 Scales for auxiliary lines are not shown on this reduced chart. Accompanying “Calculations for Dryer Design” By William M. Grosvenor, 1908 0.02 0.04 0.06 te am Williams Engraving Co. 0.14 0.16 0.18 0.20 25 0.00 0.08 0.10 0.12 Humidity Ratio (LBwv/LBda) Figure 1: Supplement to Transactions of American Institute of Chemical Engineers, Volume 1, published in 1908. Grosvenor Humidity Chart By Donald P Gatley, P Fellow/Life Member ASHRAE . .E., A SHRAE Journal and designers of air conditioning, drying, dehumidification, food science and humidification processes, and meteorologists celebrated and sharing more accurate and less tedious design methods. Grosvenor Humidity Chart the 100th anniversary of Willis H. Carrier’s hygrometric chart in 2004.1 Four years later, we celebrate the centennial of the humidity chart produced by William Mason Grosvenor Jr., Ph.D., a chemical engineer of New York City. Both charts are now known as psychrometric charts in most of the world and as Mollier h-x charts in parts of Europe. A quick comparison of the lives of the two chart creators is shown in the sidebar “Lives of William Mason Grosvenor and Willis Haviland Carrier.” Grosvenor and Carrier were recent 60 ASHRAE Journal Grosvenor’s chart (Figure 1) accompanied his 19-page manuscript in volume one (1908) of the Transactions of the American Institute of Chemical Engineers.2 The chart and humidity table required more than 3,000 tedious calculations. To the untrained eye, the Grosvenor Humidity Chart bears little resemblance to the Carrier chart primarily because the abscissa and ordinate coordinates are About the Author Donald P Gatley, P is a retired consulting en. .E., gineer and moisture consultant. He is the author of Understanding Psychrometrics, 2nd edition published by ASHRAE. college graduates and newly employed in an industry that would benefit significantly from the psychrometric chart. They were committed to helping other engineers in their fields by developing ashrae.org October 2008 http://www.ashrae.org
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