2. LOG MEAN
TEMPERATURE
DIFFERENCE
Heat flows between the hot and
the cold streams due to
temperature difference across
the tube acting as a driving force.
The temperature difference will
vary along the length of the heat
exchanger.
3. Cont...
The Integrate average temperature difference for either parallel or
counter flow can be written as;
The effective temperature calculated from this equation is known
as log mean temperature difference.
4. The following elaboration shows that LMTD counter flow heat
exchanger is greater the LMTD parallel flow or cross flow heat
exchanger.
Where;