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Energies 2016, 9(7), 495; doi:10.3390/en9070495

Performance Analysis of a Reciprocating Piston Expander and a Plate Type Exhaust Gas Recirculation Boiler in a Water-Based Rankine Cycle for Heat Recovery from a Heavy Duty Diesel Engine

1
Division of Combustion, Department of Applied Mechanics, Chalmers University of Technology, Gothenburg 41296, Sweden
2
TitanX Engine Cooling AB, Sölvesborg 29471, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Ling Bing Kong
Received: 15 April 2016 / Revised: 29 May 2016 / Accepted: 12 June 2016 / Published: 29 June 2016
(This article belongs to the Special Issue Waste Energy Harvesting)
View Full-Text   |   Download PDF [7688 KB, uploaded 29 June 2016]   |  

Abstract

The exhaust gas in an internal combustion engine provides favorable conditions for a waste-heat recovery (WHR) system. The highest potential is achieved by the Rankine cycle as a heat recovery technology. There are only few experimental studies that investigate full-scale systems using water-based working fluids and their effects on the performance and operation of a Rankine cycle heat recovery system. This paper discusses experimental results and practical challenges with a WHR system when utilizing heat from the exhaust gas recirculation system of a truck engine. The results showed that the boiler’s pinch point necessitated trade-offs between maintaining adequate boiling pressure while achieving acceptable cooling of the EGR and superheating of the water. The expander used in the system had a geometric compression ratio of 21 together with a steam outlet timing that caused high re-compression. Inlet pressures of up to 30 bar were therefore required for a stable expander power output. Such high pressures increased the pump power, and reduced the EGR cooling in the boiler because of pinch-point effects. Simulations indicated that reducing the expander’s compression ratio from 21 to 13 would allow 30% lower steam supply pressures without adversely affecting the expander’s power output. View Full-Text
Keywords: waste-heat recovery (WHR); piston expander; Rankine cycle waste-heat recovery (WHR); piston expander; Rankine cycle
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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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MDPI and ACS Style

Latz, G.; Erlandsson, O.; Skåre, T.; Contet, A.; Andersson, S.; Munch, K. Performance Analysis of a Reciprocating Piston Expander and a Plate Type Exhaust Gas Recirculation Boiler in a Water-Based Rankine Cycle for Heat Recovery from a Heavy Duty Diesel Engine. Energies 2016, 9, 495.

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