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
Journal article, 2016

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.

piston expander

waste-heat recovery (WHR)

Rankine cycle

Author

Gunnar Latz

Chalmers, Applied Mechanics, Combustion

Olof Erlandsson

TitanX Engine Cooling AB

Thomas Skåre

TitanX Engine Cooling AB

Arnaud Contet

TitanX Engine Cooling AB

Sven B Andersson

Chalmers, Applied Mechanics, Combustion

Karin Munch

Chalmers, Applied Mechanics, Combustion

Energies

1996-1073 (ISSN)

Vol. 9 7 495- 495

Driving Forces

Sustainable development

Areas of Advance

Transport

Energy

Subject Categories

Energy Engineering

DOI

10.3390/en9070495

More information

Created

10/7/2017