STG-5 Mean Temperature Difference Correction Factor for the TEMA "H" Shell

K. Ishihara and J. W. Palen

A closed analytical expression for calculating the TEMA H shell F-factors (mean temperature difference correction factor) is derived. The F-factors, computed for various values of NTU (number of transfer units), and the parameter R (heat content ratio), are found to be almost identical to the values of TEMA G shell F-factors over most of the parameter ranges. The difference becomes significant only when NTU is greater than 20 and R is greater than 4. Therefore, this work confirms for the first time that, for all practical purposes, the TEMA G shell F-factor can be substituted for the TEMA H shell F-factor. With this derivation, the F-factor charts for all types of shell-and-tube heat exchangers covered in the HTRI Design Manual are completed.