UDC 621.184.64

P. Naphon and S. Wongwises

INVESTIGATION OF THE PERFORMANCE OF A SPIRAL-COIL FINNED TUBE HEAT EXCHANGER UNDER DEHUMIDIFYING CONDITIONS
In the present study, heat transfer characteristics of spiral-coil finned tube heat exchangers under dehumidifying conditions are investigated. A mathematical model of Ho et al. is modified by including fin efficiency. The derivation and solution methodologies are explained in detail. The effects of various inlet conditions of fluids flowing through the heat exchanger are discussed. The agreement of the model with the experimental data is satisfactory, with an average error of 1.2 and 4.0% for enthalpy and humidity effectivenesses, respectively. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Laboratory (FUTURE), Department of Mechanical Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand. Tel.: +662-470-9115; Fax : +662-470-9111; Email: somchai.won@kmutt.ac.th.