Pipe dehumidifier according to equation (7-23) have, thus the above equation can be rewritten as (7-26) 
 Enthalpy of moist air: According to the nature of ideal gas mixtures, the enthalpy of moist air enthalpy of dry air in which the sum of enthalpy and water vapor, which 

 Taking into account the quality of water vapor in moist air constantly changing, and dry air mass is stable, so the wet air enthalpy h is relative in terms of unit mass of dry air, ie (7-27) 
 Moist air enthalpy h of the unit is kJ / kg (A). 
 0 ℃ to take the enthalpy of dry air when the value is zero, then the dry air enthalpy ha. Can be calculated as follows: 

 Where cp, a ratio of dry air heat capacity at constant pressure. At low pressure, the enthalpy of water vapor close to the temperature of the single value hv increasing function, and approximated by the following formula: ★ ★ ★ (Galileo Galileo) machinery, equipment industry, high-end brands - the European Quality ★ ★ ★ 
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 Where: hc is a constant; cp, V, is equivalent to heat capacity for water vapor than an empirical value. Enthalpy of moist air which can be written (7-28) 
 Use of legal measurement units, the formula is (7-28a) 
 1567 times 
 Dry - wet bulb temperature [2008-11-15] 
 Abstract: In the humid air in the process of analysis and calculation is usually required to determine the moisture content of humid air or relative humidity.