Exchanged Heat in a Heat Exchanger

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Exchanged Heat in a Heat Exchanger Formula

\(\large{ Q  =  h \; A \; LMTD }\)   

Where:

 Units English Metric
\(\large{ Q }\) = exchanged heat duty \(\large{ \frac{Btu}{lbm}}\) \(\large{ \frac{J}{kg}}\)
\(\large{ A }\) = exchange area \(\large{ft^2}\) \(\large{m^2}\)
\(\large{ h }\) = heat transfer coefficient \(\large{\frac{Btu}{hr-ft^2-F}}\)  \(\large{\frac{W}{m^2-K}}\)
\(\large{ LMTD }\) = logarithmic mean temperature differential \(\large{ \frac{Btu}{lbm}}\) \(\large{ \frac{J}{kg}}\)

 

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Tags: Heat Transfer Equations Heat Exchanger Equations