# Exchanged Heat in a Heat Exchanger

on . Posted in Thermodynamics

## Exchanged Heat in a Heat Exchanger Formula

$$\large{ Q = h \; A \; LMTD }$$
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 $$\large{ \frac{Btu}{lbm}}$$ $$\large{ \frac{J}{kg}}$$