![]() ![]() Here, the abscissa is labeled Dry bulb temperature and provided in degrees Fahrenheit the ordinate is Grains of moisture per lb dry air. 018 HUMIDITY RATIO - KILOGRAMS MOISTURE PER KILOGRAM DRY AIR 0.90 60 HUMIDITY RATIO (or Specific Humidity) GRAMS OF MOISTURE PER KILOGRAM OF DRY AIR 0. Willis Carrier’s first psychrometric chart. 016 0.80 20% -5 0.78 MIDITY TIVE HU 10% RELA 0.76 0 -10 -5 0 Below 32 F, properties and enthalpy deviation lines are for ice. 000 Sensible Heat Factor PSYCHROMETRIC CHART Normal Temperature SI Units SEA LEVEL 90 BAROMETRIC PRESSURE: 101.325 kPa 24. 001 0 ` Dry-Bulb 20 Temperature F 25 30 35 40 Below 32 F, properties and enthalpy deviation lines are for ice. Experiment with chart at various intersections of humidity ratio and air temperature to perform your own calculations Find the vertical line on the graph marked this is the degrees dry-bulb line. 004 Btu 0.2 Btu ` 12.5 Wet-Bulb Dewpoint or Saturation Temperature F. Some psychrometric charts use dry-bulb temperature and humidity ratio coordinates. 015 60 % OF D UN PE tu TU 2B -B -.08 Btu -.06 Btu -.04 Btu -.0 LP Y -0.3 Btu - Enthalpy deviation Btu per pound of dry air R PO IR RY A LB. ![]() Pounds of moisture per pound of dry air ` Grains of moisture per pound of dry air ` PSYCHROMETRIC CHART Normal Temperature I-P Units SEA LEVEL 180 BAROMETRIC PRESSURE: 29.921 in. ![]()
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