The sensible heat transfer characteristics of ‘ at-fin, corrugated-fin and turbulated-fin cooling coils is investigated using a laboratory rig. Measurements at different fin geometry, inlet air conditions and inlet chilled water temperature were conducted. The Nusselt number was found to be largely independent of both inlet air and chilled water temperatures. The turbulated-fin coil was found to have the highest value of heat transfer coefficient. In particular, at the same rate of heat transfer, the corrugated- and turbulated-fin coil types required 11% and 30% less fin surface area than ‘ at-fin, respectively.
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References
1.
Wang CC, Fu WL, Chang CT. Heat transfer and friction characteristics of typical wavy fin-and-tube heat exchangers. Exp. Thermal Fluid Sci. 1997; 14: 174–186.
2.
Springer ME, Thole KA. Experimental design for ‘ ow field studies of louvered fins. Exp. Thermal Fluid Sci. 1998; 18: 258–269.
3.
Wang C, Tsai Y, Lu D. Comprehensive study of convex-louver and wavy fin-and-tube heat exchangers. J. Thermophys. Heat Transfer1998; 12: 423–430.
4.
Wang CC, Jang JY, Chiou NF. A heat transfer and friction correlation for wavy fin-and-tube heat exchangers. Tech. Notes: Int. J. Heat Mass Transfer1999; 42: 1919–1924.
5.
Wang CC, Tao WH, Chang CJ. An investigation of the airside performance of the slit fin-and-tube heat exchangers. Int. J. Refrigeration1999; 22: 595–603.
6.
Wang CC, Lee WS, Sheu WJ. A comparative study of compact enhanced fin-and-tube heat exchangers. Int. J. Heat Mass Transfer2001; 44: 3565–3573.
7.
Garimella S, Coleman JW. Design of cross-‘ ow condensers for ammonia-water absorption heat pumps. ASHRAE Trans. 1998; 21: 1553–1564.
8.
Lozza G, Merlo U. An experimental investigation of heat transfer and friction losses of interrupted and wavy fins for fin-and-tube heat exchangers. Int. J. Refrigeration2001; 24: 409–416.
9.
Holman JP. Experimental methods for engineers. New York: McGraw-Hill, 1994.
10.
Gnielinski V. New equations for heat and mass transfer in turbulent pipe and channel ‘ ow. Int. Chem. Eng. 1976; 16: 359–368.
11.
Kay WM, London AL. Compact heat exchangers. New York: McGraw-Hill, 1984.
12.
Ghanem AG. An experimental investigation for enhancement of heat transfer though fin-and-tube heat exchanger using corrugated fins. MSc thesis, Cairo University, 1996.
13.
ASHRAE Handbook of fundamentals. Atlanta, GA: American Society of Heating, Refrigeration and Air-Conditioning Engineers, 1997.
