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

Gunnar Latz, Olof Erlandsson, Thomas Skåre, Arnaud Contet, Sven Andersson and Karin Munch
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Gunnar Latz: Division of Combustion, Department of Applied Mechanics, Chalmers University of Technology, Gothenburg 41296, Sweden
Olof Erlandsson: TitanX Engine Cooling AB, Sölvesborg 29471, Sweden
Thomas Skåre: TitanX Engine Cooling AB, Sölvesborg 29471, Sweden
Arnaud Contet: TitanX Engine Cooling AB, Sölvesborg 29471, Sweden
Sven Andersson: Division of Combustion, Department of Applied Mechanics, Chalmers University of Technology, Gothenburg 41296, Sweden
Karin Munch: Division of Combustion, Department of Applied Mechanics, Chalmers University of Technology, Gothenburg 41296, Sweden

Energies, 2016, vol. 9, issue 7, 1-18

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.

Keywords: waste-heat recovery (WHR); piston expander; Rankine cycle (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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