## Counter-flow Heat Exchanger

Figure above shows a fluid flowing through a pipe and exchanges heat with another fluid through an
annulus surrounding the pipe. In a counter-flow heat exchanger fluids flow
in the opposite direction. If the
specific heat capacity of fluids are constant, it can be shown that:

where,

**dQ/dt= Rate of heat transfer between two fluids **

**U= Overall heat transfer coefficient **

**A= Area of the tube **

**T= Logarithmic mean temperature difference defined by: **

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