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ABSTRACT This project is a feasibility study to investigate the possible substances that can be used in a bottom Rankine cycle in connection with a combustion heat engine, such as a regular gasoline or diesel engine. This Rankine cycle, sometimes called organic Rankine cycle, converts some of the engine exhaust gas energy to useful shaft work. This cycle has a lower high temperature and uses the atmosphere as the low temperature energy reservoir for its condenser. For this reason, the working substance must be selected so the phase change and pressures are suitable for the application. The working substances investigated are mainly within the scope of pure substances. Mixtures are only briefly investigated due to their complexity. The basic approach of this project is a theoretical model of the system built in MATLAB software with the thermal properties provided by NIST (National Institute of Standards and Technology) database. Important characteristics of the cycle, such as thermal efficiency, maximum shaft work produced, high pressure, low pressure and mass flow rate, are calculated with various working substances for different operating conditions. These conditions are important design characteristics, such as exhaust gas temperature, turbine isentropic efficiency and heat exchanger efficiency. The final selection is based on the thermal efficiency of the cycle, net work produced, feasibility of the cycle, and concerns regarding environmental impact and safety. The results of this project are best choices of working substances for different exhaust gas temperatures. Mixtures are briefly studied for the purpose of future research. Keywords: organic Rankine cycle (ORC), combustion engine, exhaust gas, working substance. 2PDF Image | Working Fluid Selections in Organic Rankine Cycle ICE
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