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waste heat from a high temperature heat source whereas R-112 and R-123 were best with low temperature heat sources. It was also shown that the irreversibilities mainly depend on the type of heat source, specifically vapor or liquid. To obtain an understanding of how to analyze and interpret how an ORC is optimized and operated efficiently many articles were read on the general topic of ORC’s. An ORC using R-245fa was analyzed and optimized using exhaust heat as the heat input source. This ORC is described in the journal article written by Dong Hong Wei, et al. The article found that increasing the mass flow of exhaust was the best way to effectively utilize all the waste heat available. It was also found that the fluid should be barely sub cooled when it exits the condenser. It was also found that ambient temperature played little role on the output of the system just mainly on the condenser, if it was air-cooled. An experimental study is carried out on an ORC recovering heat from hot air at a temperature ranging from 150 to 200°C. This study was described in detail in Sylvian Quoilin’s experimental modeling of small scale ORC’s. The expander used for this study is a volumetric scroll expander. The working fluid selected is R-123 because of its high efficiency in ORC applications. During the testing period, the efficiency of the cycle and its output shaft power are increased. The limits of the cycle are investigated by modifying the hot air source temperature, expander rotational speed, and refrigerant charge. It turns out that the refrigerant charge has a tremendous importance in the behavior of the cycle and that its optimal value has to be found in order to maximize the performances. 11PDF Image | NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.
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