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research revealed that the most suitable choice for the ORC layout was the first layout operating at saturated conditions without a regenerator with an evaporator temperature of 140oC. Also it was found that using additional waste heat from engine cooling was more beneficial to the desired performance than, for example, incorporating a regenerator or changing system performance by the addition of superheat. Also the working fluid in the cycle is very important and there are a few alternatives which actually have a higher thermodynamic efficiency for the same operating conditions, however may not be suitable for reasons of practicality; cost, toxicity and corrosiveness to components among other things. Since the power output of our ORC is in the range of 1MW (small scale), the best options with regard to turbine selection are different for large scale applications. The best current option for our capacity range was found to be the radial inflow turbine because of its high isentropic efficiency and flexibility at different operating conditions. However the Euler turbine shows great promise for future applications because of its lower cost of construction and robustness especially in vapour flows where moisture or contaminants may be present. Also the Euler turbine operates at lower speeds than the Radial Inflow turbine which decreases its size and the losses associated with operation; however the Euler turbine is still mostly at an experimental stage where its advantages have not yet been proven in practice. The ORC continues to be under investigation today since it utilizes waste heat that would normally just be dumped to the environment, this will continue to be important as the global situation with regard to energy and climate change intensifies. (Gordon Denbow, Reza Rowshanzadeh, Andrew Tabije,..(2010).” 30PDF Image | Exergy
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