Exchanged Heat in a Heat Exchanger

on . Posted in Thermodynamics

  

Exchanged Heat in a Heat Exchanger Formula

\(\large{ Q  =  h \; A \; LMTD }\)     (Exchanged Heat in a Heat Exchanger)

\(\large{ h  =  \frac{ Q }{ A \; LMTD } }\)

\(\large{ A  =  \frac{ Q }{ h \; LMTD } }\)

\(\large{ LMTD  =  \frac{ Q }{ h \; A } }\)

Symbol 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 Heat Exchanger