Influence of Evaporator Superheating and Pressure on the Performance ORC with R134a

Abstract

This research examines the heat sources using a low-temperature organic Rankine cycle thermodynamic analysis. The effect of increasing the temperature and pressure at the expander input is explored. The performance of an ORC system using R134a was investigated thermodynamically. The expander's input temperature ranged from 55 to 85 degrees Celsius. Pressures in the evaporator range from 0.4 to 0.6 MPa. The software used was Engineering Equation Solver. The temperature and pressure of evaporation have an impact on cycle characteristics including net power production, irreversibility, rotational speed, and thermal and exergy efficiency. At constant evaporator pressure of 0.6 MPa and rising temperature, the thermal efficiency drops to 3.907%, whereas at constant evaporator temperature and expander pressure of 0.4-0.6 MPa, the thermal efficiency rises to 3.907%. When the exergy efficiency is 0.6MPa at constant evaporator pressure, raising the temperature leads to an increase in exergy efficiency of 18.81% -18.89%. At 85℃ and a pressure of 0.4-0.6 MPa, the effect of increasing exergy efficiency was between 2.185% and -18.89% at constant evaporator temperature. The findings of the research reveal that the ORC power plant is a good choice for energy generation. R134a is suitable for the ORC system.