Saturation Curve (100% RH) / / / <-- Wet Bulb / Enthalpy (Diagonal) / / / / / / <-- Relative Humidity (Curved) /_______/_______/ <-- Dew Point / Humidity Ratio (Horizontal) | | | | | | <-- Dry Bulb (Vertical) |_______|_______| Vertical Lines
W=0.622⋅PvP−Pvcap W equals 0.622 center dot the fraction with numerator cap P sub v and denominator cap P minus cap P sub v end-fraction Relative Humidity Relative humidity ( RHcap R cap H
To read the chart accurately, you must identify the orientation and behavior of each property line. psychometric chart
): The actual mass of water vapor per unit mass of dry air (expressed as ). It forms the vertical axis (y-axis) on the far right. Specific Enthalpy (
Overall, psychometric charts are a valuable tool for understanding and working with the thermodynamic properties of air in various fields. Saturation Curve (100% RH) / / / W=0
h=(Cpa⋅Tdb)+W⋅(2501+Cpw⋅Tdb)h equals open paren cap C sub p a end-sub center dot cap T sub d b end-sub close paren plus cap W center dot open paren 2501 plus cap C sub p w end-sub center dot cap T sub d b end-sub close paren 5. Practical Applications Building Comfort Design
The psychrometric chart converts complex thermodynamic equations into an intuitive visual tool. With practice, any HVAC or environmental process can be rapidly modeled, understood, and optimized by plotting state points and connecting process lines on the chart. Specific Enthalpy ( Overall, psychometric charts are a
Air passes over a dry heating coil. The state point moves . Tdbcap T sub d b end-sub increases. remains constant. RHcap R cap H decreases. Sensible Cooling