10 15 20 25 30 35 40 45 50 55 55 60 60 ENTHALPY - BTU PER POUND OF DRY AIR 15 20 25 30 35 40 45 50 ENTHALPY - BTU PER POUND OF DRY AIR SATURATION TEMPERATURE - °F 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 DRY BULB TEMPERATURE - °F .002 .004 .006 .008 .010 .012 .014 .016 .018 .020 .022 .024 .026 .028 10% RELATIVE HUMIDITY 20% 30% 40% 50% 60% 70% 80% 90% 35 35 40 40 45 45 50 50 55 55 60 60 65 65 70 70 75 75 80 80 85 WET BULB TEMPERATURE - °F 85 90 12.5 13.0 13.5 14.0 VOLUME- CU.FT. PER LB. DRY AIR 14.5 15.0 HUMIDITY RATIO - POUNDS MOISTURE PER POUND DRY AIR Outside Air Mixed Air Discharge Air Return Air R R ASHRAE PSYCHROMETRIC CHART NO.1 NORMAL TEMPERATURE BAROMETRIC PRESSURE: 29.921 INCHES OF MERCURY Copyright 1992 AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS, INC. SEA LEVEL 0 1.0 1.0 : 2.0 4.0 8.0 -8.0 -4.0 -2.0 -1.0 -0.5 -0.4 -0.3 -0.2 -0.1 0.1 0.2 0.3 0.4 0.5 0.6 0.8 -2000 -1000 0 500 1000 1500 2000 3000 5000 - : : SENSIBLE HEAT Qs TOTAL HEAT Qt ENTHALPY HUMIDITY RATIO Dh DW
