A FINITE TIME THERMODYNAMIC MODELLING OF REFRIGERATION SYSTEMS

Abstract

A finite- time thermodynamic model which (which includes first and second law analysis) simulates the working of an actual vapor-compression system and cascade system has been developed. Inputs required for the model are Evaporator coolant inlet temperature, Condenser coolant inlet temperature, rate of heat absorbed by evaporator, product of condenser effectiveness and capacitance rate of external fluid, product of evaporator effectiveness and capacitance rate of external fluid and efficiency of compressor. The ouputs of the program are the COP, exergy destruction in different components, refrigerant mass flow rate, EDR, exergitic efficiency, compressor work and all other system parameters enthalpy, entropy, temperature and pressures at different state points. Thermodynamic model of simple VCRS is developed for R22, R134A, R407C, M20 and R410A. Performance curves for R134A, R407C, M20 and R410A are compared with R22 to find its nearer substitute. It is found that best substitute of R2...