Abstract
For now the global energy use,over 90% energy consumption is in heat form,but only 40% heat energy be transferred into mechanical work, electricity or chemical energy etc; the rest 50% would be emitted as the waste heat, so it is considerable to the low and medium waste heat recover market . For now the primary waste heat recover way is Organic Rankin Cycle (ORC). The organic fluid has a lower boiling temperature suitable for the low temperature heat source to evaporate. The efficiency is about 10%. In order to further raise the efficiency, the academic community takes their research in supercritical cycle. Supercritical Organic Rankin Cycle (SORC) is to pressurize the organic fluid over the critical point to produce larger energy gap to make work. But the equipment in need would have more restrictions due to the working condition, also the incompleteness of the research data. According to this the research put the emphasis on the SORC working component. First is to decide the designation of the component. We have to decide the working fluid and its thermal character. In the research procedure, we compare the 200℃ and 300℃ heat source temperature efficiency and compare it to the subcritical cycle. To the 200℃ fluid the best efficiency only 0.78% better than the subcritical but 2.95% in 300℃. The best efficiency fluid in 300℃ is R123 which can reach to 17.71%. According to the thermal condition and the working range we use radial turbine as the research target. Do the fluid simulation using subcritical fluid coefficient of the radial turbine according to document [23]. Compare the result and the isentropic efficiency to confirm the reliability of the simulation .Use the same model to the supercritical fluid’s thermal character then compare and discuss their results. In the future, we would consult the related document about the advised range of the radial turbine coefficient to design R123 stator and rotator, then adjust the coefficient due to the simulation result to get the largest output and best working efficiency.