BAROMETRIC PRESSURE: 29.921 in. HG PSYCHROMETRIC CHART Normal Temperature I-P Units SEA LEVEL -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 DRY BULB TEMPERATURE - °F 0 5 10 15 20 25 30 35 40 45 50 55 55 60 60 ENTHALPY - BTU PER POUND OF DRY AIR 0 5 10 15 20 25 30 35 40 45 50 ENTHALPY - BTU PER POUND OF DRY AIR SATURATION TEMPERATURE - °F .05 .1 .15 .2 .25 .3 .35 .4 .45 .5 .55 .6 .65 .7 .75 .8 .85 .9 .95 1 1.05 1.1 1.15 1.2 1.25 1.3 1.35 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 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 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 15% 25% 2% 4% 6% 8% RELATIVE HUMIDITY 10% RELATIVE HUMIDITY 20% 30% 40% 50% 60% 70% 80% 90% -5 0 0 5 5 10 10 15 15 20 20 25 25 30 30 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 12.0 13.0 14.0 VOLUME- CU.FT. PER LB. DRY AIR 15.0 HUMIDITY RATIO - GRAINS OF MOISTURE PER POUND OF DRY AIR 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 8-107
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