Expansion of organic Rankine cycle working fluid in a cylinder of a low-speed two-stroke ship engine
Artikel i vetenskaplig tidskrift, 2016

Electricity and power produced from waste heat is particularly relevant in shipping because fuel expenses constitute the majority of the cost of operating the ships; however, the cost-benefit aspect limits the widespread implementation of waste heat recovery power units on ships. This paper presents the thermodynamic analysis of a concept that aims at reducing the cost of an organic Rankine cycle unit by using one of the cylinders in a large diesel engine as expansion device. Numerical models were used to optimise the process parameters and thereby determine the power potential for this concept. The evaluation of 104 working fluids points to cyclopropane, R245fa and R1234ze(z) as the most promising. The results suggest that the power produced by the organic Rankine cycle cylinder is at least equivalent to that of the cylinders operating with the diesel process. This enables potential fuel savings and emissions reductions of about 8.3% in the studied scenario.

Organic Rankine cycle

Waste heat recovery

Novel configuration

Piston expander

Marine diesel engine

Författare

Ulrik Larsen

Chalmers, Sjöfart och marin teknik, Maritim miljövetenskap

Jorrit Wronski

IPU, Denmark

J. G. Andreasen

Danmarks Tekniske Universitet (DTU)

Francesco Baldi

Chalmers, Sjöfart och marin teknik, Maritim miljövetenskap

L. Pierobon

Danmarks Tekniske Universitet (DTU)

Energy

0360-5442 (ISSN)

1212-1220

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Energi

Ämneskategorier

Energiteknik

Farkostteknik

DOI

10.1016/j.energy.2016.11.069