![]() ![]() ![]() They indicate the value in either m3/kg or ft3/lb. The constant specific lines start from the saturation curve and drop down with the slight angle to the vertical lines. From the psychrometric chart we can find out the specific volume of the required air and find the total volume of the required air by multiplying it with the total weight of the air required. The specific volume of air is an important parameter since one has to consider the amount of air to be handled by the cooling coil, cooling fan, etc and accordingly the rating of cooling coil and fan has to be found out. The constant enthalpy line passing through the given value of the WB temperature indicates the enthalpy of the air. To find the value of the enthalpy of the any given air, one should know its WB temperature. The constant enthalpy lines extend from the enthalpy scale down toward the right side of the chart. The enthalpy scale in the psychrometric chart is located outside the main body. The total enthalpy of the air comprises of the sensible heat and the latent heat. Along the saturation curve all the three temperatures, the DB, WB and DP are same. The extreme left curve along the shoe indicates RH of 100% and is also called the saturation curve because the condition of air along this line is fully saturated no matter what the DB and WB temperatures are. The value of RH reduces from left towards right. ![]() The different curves of RH indicate different values of humidity measured in percentage. The RH lines are the curves extending from the lower left to the upper right part of the psychrometric chart. ![]()
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