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Optimization of Design Pressure Ratio of Positive Displacement Expander for Vehicle Engine Waste Heat Recovery

Department of Environmental and Energy Systems, Korea Institute of Machinery & Materials, 171 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
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This article is based on a paper written in Korean and published by Journal of Energy Engineering, 2012, 21, 398–406.
Energies 2014, 7(9), 6105-6117; https://doi.org/10.3390/en7096105
Received: 31 July 2014 / Revised: 15 September 2014 / Accepted: 16 September 2014 / Published: 22 September 2014
(This article belongs to the Special Issue Organic Rankine Cycle (ORC))
This study investigated the effect of the built-in volume ratio of an expander on the performance of a dual-loop Rankine cycle system for the engine waste heat recovery of a vehicle. Varying vehicle operating conditions can cause a positive displacement expander to operate in both under- and over-expansion states. Therefore, analysis of the off-design performance of the expander is very important. Furthermore, the volume and weight of the expander must be considered in its optimization along with the efficiency. A simple modeling of the off-design operation of the expander showed that a built-in volume ratio that causes under-expansion rather than over-expansion at the target condition is more desirable. View Full-Text
Keywords: engine waste heat recovery; Rankine cycle; expander; under-expansion; over-expansion; expansion efficiency engine waste heat recovery; Rankine cycle; expander; under-expansion; over-expansion; expansion efficiency
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Kim, Y.M.; Shin, D.G.; Kim, C.G. Optimization of Design Pressure Ratio of Positive Displacement Expander for Vehicle Engine Waste Heat Recovery. Energies 2014, 7, 6105-6117.

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