30 40 50 60 70 80 90 100 110 115 DRY BULB TEMPERATURE - °F 10 15 20 25 30 35 40 45 50 55 ENTHALPY - Btu per lb. of dry air and associated moisture ENTHALPY - Btu per lb. of dry air and associated moisture 10 15 20 25 30 35 40 45 50 55 ENTHALPY - Btu per lb. of dry air and associated moisture WET BULB TEMPERATURE - °F 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 HUMIDITY RATIO (or Specific Humidity) GRAINS OF MOISTURE PER POUND OF DRY AIR 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 VAPOR PRESSURE - INCHES OF MERCURY 0 10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 DEW POINT TEMPERATURE - °F Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com STANDARD AIR 1.00 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 SENSIBLE HEAT RATIO = Qs / Qt SENSIBLE HEAT RATIO = Qs / Qt 10% RELATIVE HUMIDITY 20% 30% 40% 50% 60% 70% 80% 90% WET BULB TEMPERATURE - °F 20 25 30 32 35 40 45 50 55 60 65 70 75 80 85 90 12.6 12.8 13.0 13.2 13.4 13.6 13.8 14.0 14.2 14.4 14.6 14.8 15.0 Outside Air Mixed Air Discharge Air Return Air BAROMETRIC PRESSURE: 29.921 in. HG Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
