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CONCLUSIONS Table 212: R245fa ORC performance for cooling Based on performed investigation and market evaluation, ORC can be applied in several areas cost effectively. Biomass CHP and biomass digestion waste heat recovery applications, micro scale CHP system including solar CHP unit, solar desalination unit, ORC as micro gas turbine bottoming cycle to improve its efficiency from 30% to 40% and geothermal applications are some areas. In addition to that, waste heat recovery from steel, ceramic, and cement industries, IC engines, light and heavy duty vehicles same as ships can also be added to the list. ORC is also able to be used as bottoming cycle of recuperative or high pressure ratio gas turbines and MOFCs cost effectively in comparison with other available technologies. Solar based ORC seems to be implemented more cost effectively than PV power generation system with ability of energy storage in PCM storage. Even ORC can be used in gas cooled nuclear reactors to improve both thermal and exergy efficiencies. ORC can be used for cooling devices. In this application, optimization is done based on a number which is ratio of heat addition in pre‐heater to heat addition in evaporator. The bigger the number better ORC performance is achieved. To improve ORC system and to reduce the cost, trend of thermal and exergy efficiencies and turbine size showed meaningful relations with degree of superheat, mass flow rates of fluids, working fluid and expander or turbine types. Some of results were investigated to match with available information in literature. Proper ORC speed will make the system to be compact and simple. This will eliminate the need for gear box and lubrication system while the pump, turbine and generator can be on a single shaft. Putting ORC components in vertical position compensates the thrust load on thrust bearings via pressure distribution, and causes minimum starting torque on radial bearings. 77PDF Image | Exergy
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