![]() ![]() LMTD = (dt o - dt i) / ln(dt o / dt i) (1) LMTD (or DT LM) - Logarithmic Mean Temperature Difference.A logarithmic mean temperature difference is termed The rise in secondary temperature is non-linear and can best be represented by a logarithmic calculation. Logarithmic Mean Temperature Difference - LMTD The temperature profile in the primary fluid is not dependent on the direction of flow. With saturation steam as the primary fluid the primary temperature can be taken as a constant since the heat is transferred as a result of a change of phase only. ![]() or perpendicular to each other - cross flow.in the opposite direction - counter-current flow.flow in the same direction - parallel flow or co-current flow.The primary and secondary fluid in an heat exchanger process may The mean temperature difference in a heat transfer process depends on the direction of fluid flows involved in the process. in a heat transfer process the temperature difference vary with position and time.According to Newton's Law of Cooling heat transfer rate is related to the instantaneous temperature difference between hot and cold media
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