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Thursday, 9 May 2019

Psychrometric Chart

Psychrometric Chart
- Psychrometric charts are graphic representations of the psychrometric properties of air. 1) Dry Bulb The DB temperature increases from the left to the right. The vertical lines shown in the chart are the constant DB temperature lines and all the points located along a particular vertical line have same DB temperature. 2) Moisture Content: - Moisture content is the water vapor present in the air and is measured in gram per kg of dry air (gm/kg of dry air). 3) Wet Bulb (WB) - The outermost curve along the left side indicates the Wet Bulb (WB) temperature scale. The constant WB temperature lines are the diagonal lines extending from WB temperature curved scale downwards towards the right hand side of the chart. 4) Dew Point (DP) The scale of the DP and WB temperature is the same, however, while the constant WB temperature lines are diagonal lines extending downwards, the constant DP temperature lines are horizontal lines 5) Relative Humidity RH lines are the curves extending from the lower left to the upper right part of the psychrometric chart. The different curves of RH indicate different values of humidity measured in percentage. 6) Total Enthalpy of the Air The total enthalpy of the air comprises of the sensible heat and the latent heat

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