Modeling of Finned-Tube Heat Exchanger Using in Air Conditioning System
Keywords:
Air conditioning, finned-tube heat exchange, three zone, R-134aAbstract
This paper proposes mathematical models of evaporator and condenser used in a domestic air conditioning system with wavy fin and the refrigerant R-134a is used as a working fluid. By using the simulation method, the model for the evaporator with condensation of the water vapor on the outer surface is divided into three parts: dry two-phase (DTP), wet two-phase (WTP) and superheated (SH). The model for the condenser with dry surface is also divided into three parts: de-superheating (DSH), condensing (COND) and sub-cooling (SC). Hence each section must be modeled separately and coded into a computer visual basic program for evaluating the exit temperature of heat exchanges, heat transfer rate and parameters of prime importance to design heat exchanges for air conditioning system.
References
Dittus, F.W., and Boelter, L.M.K. (1930). Heat transfer in automobile radiators of the tubular type. University of California, Publications in Engineering, 2:443-461.
McQuiston, F.C., and Parker, J.D. (c1977). Heating Ventilating and Air Conditioning. 4th ed. Wiley & Sons, NY, p. 547-613.
Shah, M.M. (1982). Chart correlation for saturated boiling heat transfer: equations and further study. ASHRAE Transaction, 88(Pt1):185-196.
Theerakulpisut, S., and Priprem, S. (1998). Modeling cooling coils. Int. Comm. Heat Mass Transfer, 25(1):127-137.
Threlkeld, J.L. (c1970). Thermal Environmental Engineering. 2nd ed. Prentice-Hall, Inc., p. 254-265.
Webb, R.L. (1990). Air-side heat transfer correlation for flat and wavy plate fin-and-tube geometries. ASHRAE Transaction, 96(Pt1):445-449.
