Air - Psychrometric Chart for Standard Atmospheric Conditions - Imperial Units
Psychrometric chart for air at barometric pressure 29.921 inches of Mercury and temperature ranging 20oF to 120oF.
The psychrometric chart below is made for standard atmospheric conditions.
- English (Imperial) units with wet bulb and dry bulb temperature and relative humidity
- barometric pressure 29.921 inches of Mercury
- dry bulb temperature ranging 20oF to 120oF
- with enthalpy units in Btu/lb
- Open the printable pdf file - Psychrometric Chart - Barometric Pressure 29.921 inches of Mercury
The psychrometric chart is made with the PsycPro software available from www.linric.com.
- Transform between the Mollier diagram and the psychrometric chart
- Standard Atmospheric Pressure = 1 atm = 101.325 kN/m2 = 101.325 kPa = 14.7 psia = 0 psig = 29.92 in Hg = 760 torr = 33.95 Ft.H2O = 407.2 In.W.G (Water Gauge) = 2116.8 Lbs./Sq.Ft.
How to Use the Psychrometric Chart
The state of air with dry bulb temperature 70 oF and relative moisture 60% can be visualized in a psychrometric chart as indicated below:
From the chart - the saturation temperature is approximately 61 oF and that the humidity ratio is approximately 66 grains of moisture per pound of dry air.
Air with saturation temperature 63 oF and dry bulb temperature 75 oF can be visualized in the psychrometric chart as
From the chart - the relative humidity is approximately 50% and the humidity ratio is approximately 66 grains* of moisture per pound of dry air.
*grains of water is commonly used in psychrometrics
- 1 grain = 0.000143 lbm = 0.0648 g (7000 grains per lbm)
Related Topics
-
Air Psychrometrics
Moist and humid air calculations. Psychrometric charts and Mollier diagrams. Air-condition systems temperatures, absolute and relative humidities and moisture content in air.
Related Documents
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Air - Heating, Cooling, Mixing, Humidifying or Dehumidifying Processes
Basic air changing state processes - heating, cooling, mixing, humidifying and dehumidifying by adding steam or water - psychometric diagrams and the Mollier charts. -
Air - Humidifying by Adding Steam or Water
Air can be humidified by adding water or steam. -
Air - Humidifying with Steam - Imperial Units
Estimate the amount of steam required (lb/h in 100 cfm) in humid air. -
Air - Humidifying with Steam, SI units
Using steam to humidify air. -
Air - Humidity Measurement from Dry and Wet Bulb Temperature
Relative humidity in moist air can estimated by measuring the dry and wet bulb temperature. -
Dehumidifiers
Classification of dehumidifiers. -
Moist Air - Psychrometric Table for Pressure 29.92 inHg
Dry and wet bulb temperatures, saturation pressure, water vapor weight, specific volume, heat and more. -
Moist Air - Psychrometric Terms
Dry and wet bulb temperature, specific volume, relative humidity, enthalpy and more. -
Moist Air - the Mollier Diagram
The Mollier diagram is a graphic representation of the relationship between air temperature, moisture content and enthalpy - and is a basic design tool for building engineers and designers. -
Moist Air - Transforming the Mollier Diagram to a Psychrometric Chart - or vice versa
The relationship between the psycrometric chart and the Mollier diagram. -
STP - Standard Temperature and Pressure and NTP - Normal Temperature and Pressure
The definition of STP - Standard Temperature and Pressure and NTP - Normal Temperature and Pressure.
