Thermodynamic Analysis of Geothermal Heat Sourced Organic Rankine Cycle Using Different Organic Fluids at Low Temperature

  • Ali Kemal Çakır Kastamonu Universitesi


Organic Rankine Cycles are systems used to generate electrical energy from alternative energy sources (solar energy, geothermal energy and waste heat) under low temperature and pressure. Environmentally friendly refrigerants are used as fluids in Organic Rankine Cycles. In this study, geothermal energy, a renewable energy source, was considered as the heat source for the Organic Rankine Cycle (ORC), and a theoretical thermodynamic analysis of the cycle was made.

Assuming that a sample fluid is used in the cycle, the effects of the boiler and condenser temperatures on the cycle performance are examined. According to the results obtained, as the boiler temperature increases, the power cycle thermal efficiency also increases. In the study, analysis was made for different organic fluids to determine the fluid suitable for the Organic Rankine Cycle. Comparison of performance, environmental and safety effects of Organic Rankine Cycles obtained by choosing R-134a, R-404A, R600 and R-290 fluids. Calculations were made in the Engineering Equation Solver (EES) program. The highest and lowest power cycle thermal efficiency values were determined among the fluids from the results of the comparison. In addition, the environmental compatibility of fluids used in the study has been investigated.

Sustainable Future and Technology Development