Specific Enthalpy

Written by Jerry Ratzlaff on . Posted in Thermodynamics

enthalpy of system 1Specific enthalpy, abbreviated as h, is the total energy in a system due to pressure and temperature per unit of mass in that system.

 

Specific Enthalpy formula

\(\large{ h =  \frac{H}{m}  }\)   
\(\large{ h =  u + p \; v  }\)   

Where:

 Units English Metric
\(\large{ h }\) = specific enthalpy \(\large{\frac{Btu}{lbm}}\) \(\large{\frac{kJ}{kg}}\)
\(\large{ H }\) = enthalpy \(\large{\frac{Btu}{lbm}}\) \(\large{\frac{kJ}{kg}}\)
\(\large{ m }\) = total mass of a system \(\large{lbm}\) \(\large{kg}\)
\(\large{ p }\) = pressure \(\large{\frac{lbf}{in^2}}\) \(\large{Pa}\)
\(\large{ u }\) = specific internal energy \(\large{\frac{Btu}{lbm}}\) \(\large{\frac{kJ}{kg}}\)
\(\large{ \upsilon }\)   (Greek symbol upsilon) = specific volume \(\large{\frac{ft^3}{lbm}}\) \(\large{\frac{m^3}{kg}}\)

 

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Tags: Energy Equations Enthalpy Equations