Modeling and Simulation of Refrigeration Cycle for Air Conditioning

Abstract

A steady state modeling and simulation of refrigeration cycle for air conditioning is performed. The numerical model consists of a constant rotational speed compressor, a condenser, an evaporator, a capillary tube and connecting tubes. Modeling effort is based on deriving governing equations for local thermal flow together with overall conservation of charged refrigerant. After all, the model developed here considers choking event as well as effect of refrigerant charge that are typical problems in cycle simulation of refrigeration. Solution procedure of these equations requires rather complicated iteration since those governing equations cannot be explicitly solved from input parameters. Simulation example is introduced for typical model that uses R 22 as refrigerant. Calculation is conducted from low refrigerant charge to high refrigerant charge with other parameters fixed and the obtained results show qualitatively good agreement with reported experimental data.