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). Enthalpy lines run parallel or nearly parallel to wet-bulb temperature lines, with scales located outside the main chart body. Specific Volume (

closely align with wet-bulb lines but utilize a distinct scale on the outer perimeter. Specific volume lines are much steeper than wet-bulb lines. 3. Standard HVAC Processes

Sensible Heating / Cooling <--------------------> (Horizontal) ^ Humidification (Upward) | v Dehumidification (Downward) Sensible Heating

To use the chart effectively, you must understand its primary axes and lines: Psychrometric Charts - Isaac's Science Blog