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Energy and exergy analysis of an efficient organic Rankine cycle for low temperature power generation Sami 200 150 100 50 0 Figure 8, where the Net Heat Rate NHR (Btu/kWh) is plotted for a typical Gas turbine, steam turbine and ORC. The Net Heat Rate is defined as the thermal energy used in Btu to produce 1.0 kWh of power. The data displayed in this Figure clearly show that retrofitting our proposed ORC will significantly enhance the efficiency and reduce the NHR and will also have a positive effect on the environment by cooling down the flue gases. The impact of the flue gases temperatures on the performance of the ORC is displayed in Figure 9, where under flow of constant flue gases, the temperature has been varied from 350o ̊F (176oC) to 600oF (315oC). The data clearly shows 14000 12000 10000 8000 6000 4000 2000 0 Figure 7 Net output work for various refrigerants (kW). R-245fa R-LSES R-11 R-114 Refrigerants the higher the flue gas temperature the more power produced at the turbine side. This result is expected since increasing the flue gas temperature increases the thermal energy and is dissipated at the turbine and converted to kinetic energy. Figure 10 has been constructed to demon- strate the effect of waste heat boiler source temperature T(WHB) on the cycle efficiency η. Furthermore the data presented in Figure 10 also demonstrate that the proposed ORC is very efficient in recovering waste heat at temperatures above 200oF (93oC). This can be achieved by changing the formulation of the mixture to reduce the boiling point of the mixture. Figure 8 NHR for gas turbine cycle. NHR-GT NHR-RC NHR-ORC 1 NHR Btu/kWh 007PDF Image | Energy and exergy analysis of an efficient organic Rankine cycle for low temperature power generation
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