In the current examine, heat-transfer characteristics of spiral-coil finned tube heat exchangers underneath dehumidifying circumstances are investigated. A mathematical mannequin of Ho et al. is modified by together with fin efficiency. The derivation and resolution methodologies are explained in detail. The effects of varied inlet situations of fluids flowing by the heat exchanger are discussed. The agreement of the mannequin with the experimental knowledge where is the evap coil located satisfactory, with a median error of 1.2 and 4.0% for enthalpy and humidity effectivenesses, respectively.