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This paper presents an MS Excel spreadsheet add-in for heat exchanger logarithmic mean temperature difference (LMTD) correction factors for ten heat exchanger configurations. It is a computer tool for determining the LMTD correction factors for complex heat exchanger flow arrangements. The charted correction factors for various flow arrangements were curvefitted using the MS Excel Solver tool. Lagrange interpolation scheme was used to formulate the relevant interpolation formulas for thedoi:10.5120/6260-8406 fatcat:w3z7xvgxrfgc3oi6v7dm4xzrge