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biggest exergy loss occurs in expander due to thermal and radial leakage losses. Besides, it is shown that (B.F. Tchanche, Gr. Lambrinos, A. Frangoudakis, G. Papadakis, 2010) regenerator (device which transfers heat from vapor fluid after expander to liquid fluid going to evaporator) especially in isentropic fluids like R134a will not add to better performance of system; because, it is seen that in some performed experiment the fluid temperature after regenerator will be less than fluid temperature in pump outlet. 34 ORC as bottoming cycle of micro gas turbines Environmental and energy demand concerns especially in non interruptible applications same as in hospitals or remote areas has caused an unprecedented interest in micro turbines application for power generation. Micro gas turbines as rival for internal combustion engines are one potential option. Lower efficiencies of about 30% have motivated more research on the issue. One genius solution is combining the micro gas turbine with ORC to reach higher efficiencies of about 40%. This is even true for small power generations of about 100 KW for micro gas turbines and about 35 kW for ORC.15In more general view, micro gas turbines gas power can be up to 150kW. ORC power will increase accordingly since the waste heat from micro gas turbine will increase with its power. In Figure 12 it is shown that exhaust gas from gas turbine which has temperature of about 250‐300°C is combined with an ORC unit to produce extra power. The heat transfer from gas turbine to ORC evaporator occurs at heat recovery vapor generator (Red area). Figure 12: ORC as bottoming cycle of a micro gas turbine Source: Alureiter; Wikipedia60 For this technology choosing of working fluid and best turbine are the key points. Except than some physical properties of fluid, normally the fluid selection is done based on turbine exhaust gas temperature. In 24PDF Image | Exergy
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