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Air - Psychrometric Chart for Standard Atmospheric Conditions - Imperial Units

Psychrometric chart for air at barometric pressure 29.921 inches of Mercury and temperature ranging 20^oF to 120^oF.

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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 20^oF to 120^oF
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:

How to use a psychrometric chart

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

How to use a psychrometric chart

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 lb_m = 0.0648 g (7000 grains per lb_m)

Heating, Cooling, Mixing, Humidifying and Dehumidifying Air Processes by Adding Steam or Water - Visualized in the Mollier diagram

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Related Topics

Air Psychrometrics - Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.

Related Documents

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.

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