by The Log Mean Temperature Difference (LMTD) correction factor, F, is traditionally expressed in terms of two non-dimensional parameters P=t 2 – t 1/T 1-t 1, and R=T 1 – T 2/t 2 – t 1 in form of.. The log mean temperature difference (LMTD) is the earliest method for analyzing heat exchangers. It provides a convenient method for heat exchanger selection (sizing problems) in which the temperatures are known or can be determined and the size of the heat exchanger is required.. The LMTD correction factor charts and formulas can be found.
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In thermal engineering, the logarithmic mean temperature difference (LMTD) is used to determine the temperature driving force for heat transfer in flow systems, most notably in heat exchangers.The LMTD is a logarithmic average of the temperature difference between the hot and cold feeds at each end of the double pipe exchanger. For a given heat exchanger with constant area and heat transfer.. Log Mean Temperature Difference is defined as. LMTD = (ΔT1 – ΔT2) / ln(ΔT1 / ΔT2) where, ΔT1 = T1 – t2 ΔT1 = T2 – t1. T1, T2 are inlet and outlet temperature of Fluid 1; t1, t2 are inlet and outlet temperature of Fluid 2. Log Mean Temperature Difference Correction Factor F is dependent on temperature effectiveness P and heat capacity rate.
