In the current examine, heat-transfer characteristics of spiral-coil finned tube heat exchanger tube heat exchangers below dehumidifying conditions are investigated. A mathematical mannequin of Ho et al. is modified by together with fin effectivity. The derivation and solution methodologies are explained intimately. The results of assorted inlet situations of fluids flowing via the heat exchanger are mentioned. The agreement of the mannequin with the experimental knowledge is satisfactory, with a median error of 1.2 and 4.0% for enthalpy and humidity effectivenesses, respectively.