Modeling of Finned-Tube Heat Exchanger Using in Air Conditioning System

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.