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Energies 2016, 9(12), 1001; doi:10.3390/en9121001

Experimental and Potential Analysis of a Single-Valve Expander for Waste Heat Recovery of a Gasoline Engine

1
State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
2
School of Automotive Engineering, Changshu Institute of Technology, Changshu 215500, China
*
Author to whom correspondence should be addressed.
Academic Editors: Fredrik Haglind and Saiful Bari
Received: 8 September 2016 / Revised: 20 November 2016 / Accepted: 26 November 2016 / Published: 30 November 2016
(This article belongs to the Special Issue Waste Heat Recovery)
View Full-Text   |   Download PDF [9145 KB, uploaded 30 November 2016]   |  

Abstract

In this paper, a Rankine cycle test system is established to recover exhaust energy from a 2.0 L gasoline engine. Experiments on the system’s performance are carried out under various working conditions. The experimental results indicate that the recovery power of the expander is strongly related to the load and speed of the gasoline engine. It is found that when the output power of the gasoline engine is 39.8–76.6 kW, the net power of the expander is 1.8–2.97 kW, which is equivalent to 3.9%–4.9% of the engine power. The performance simulation shows that the mass flow rate, power output, and isentropic efficiency of the piston expander are directly determined by the intake valve timing. Selecting a suitable intake valve timing can optimize the performance of the expander. The simulation results show that a 1 kW increment in power can be obtained only by selecting an optimum intake open timing. The experimental results further verify that the single-valve piston expander, because of its small dimensions, simple structure, and high speed, is appropriate, and has great potential for energy recovery of gasoline engine exhaust and has good prospects for engineering applications. View Full-Text
Keywords: waste heat recovery; gasoline engine; Rankine cycle; piston expander; intake valve timing waste heat recovery; gasoline engine; Rankine cycle; piston expander; intake valve timing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gao, W.; He, W.; Wei, L.; Li, G.; Liu, Z. Experimental and Potential Analysis of a Single-Valve Expander for Waste Heat Recovery of a Gasoline Engine. Energies 2016, 9, 1001.

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