THERMOECONOMIC ANALYSIS OF R134a-DMAC VAPOUR ABSORPTION REFRIGERATION SYSTEM

摘要

This study focuses on the analysis of Tetrafluoroethane-Dimethylacetamide (R134a-DMAC) VAR system based on both thermodynamic and economic point of view and optimal operating parameter are proposed. In thermodynamic analysis mass flow rates, temperature, pressure, enthalpy, mass fraction and exergy of various state points are determined and based on the above state point properties the system COP and exergetic efficiency are calculated. Simplified cost minimization methodology is applied to evaluate the economic costs of all the internal flows and products of the system by formulating exergoeconomic cost equations. Thermoeconomic comparisons are made between this system and H_2O-LiBr and NH_3-H_2O. It is found that thermodynamic performance of H_2O-LiBr is better than NH_3-H_2O and R134a-DMAC systems whereas thermoeconomic performance of R134a-DMAC is better than the other two systems.