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http://dx.doi.org/10.3795/KSME-B.2012.36.3.293

Exhaust-Gas Heat-Recovery System of Marine Diesel Engine (I) - Energy Efficiency Comparison for Working Fluids of R245fa and Water -  

Choi, Byung-Chul (Environment & Plant Team, Korean Register of Shipping)
Kim, Young-Min (Dept. of Engine Research, Korea Institute of Machinery & Materials)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.36, no.3, 2012 , pp. 293-299 More about this Journal
Abstract
The thermodynamic efficiency characteristics of R245fa and water as working fluids have been analyzed for the electricity generation system applying the Rankine cycle to recover the waste heat of the exhaust gas from a diesel engine for the propulsion of a large ship. The theoretical calculation results showed that the cycle, system, and total efficiencies were improved as the turbine inlet pressure was increased for R245fa at a fixed mass flow rate. In addition, the net work rate generated by the Rankine cycle was elevated with increasing turbine inlet pressure. In the case of water, however, the maximum system efficiencies were demonstrated at relatively small ratios of mass flow rate and turbine inlet pressure, respectively, compared to those of R245fa. The optimized values of the net power of the cycle, system efficiency, and total efficiency for water had relatively large values compared to those of R245fa.
Keywords
Rankine Cycle; R245fa; Water; Efficiency;
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