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The expression for heat transfer coefficient of evaporating refrigerant liquid-vapor mixture in the evaporator is given by Ayub [7]. The expression for heat transfer coefficient of condensing refrigerant liquid-vapor mixture in the condenser is given by Selvam et al [8]. All the above expressions are presented in the appendix IIIB. SIMULATION CASE STUDY The constructed ORC system model has been used to simulate an example ORC system of 50kW with the system parameters mentioned above, and heat exchanger parameters and computation method listed in Table–IIIB-1 of Appendix-IIIB. Figure–2 and Figure–3 show the figures for efficiency vs. expander inlet quality. These figures also show the effect of parasitic power and heat sink supply temperature on system efficiency. The parasitic power is the power needed to pump the heat source and heat sink fluids to/from the ORC system. As the heat sink supply temperature decreases (in this case from 21oC to 5oC), to remove the same amount of heat from the condensing refrigerant in the condenser less amount of cooling fluid is required. This may decrease the parasitic power and increase the efficiency of the system. This may be one of the advantages of using the ORC system during the winter months. 8 7.5 7 6.5 6 5.5 5 4.5 4 3.5 3 Heat Source Temperature of 200F System Pump Work Only All Pump Work (Tc=21C) All Pump Work (Tc=5C) 0.7 0.75 0.8 0.85 0.9 0.95 1 Expander Inlet Quality (kg/kg) Figure–2: Efficiency of ORC system with varying screw expander inlet quality for heat source temperature of 200oF (93oC). 16 Efficiency (%)PDF Image | Optimizing Heat Recovery Systems for Power Generation in Rural AK
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