A3 Book section, chapters in research books

Chapter 9. Organic Rankine Cycles in Automotive Applications


Publication Details
Authors: Uusitalo Antti, Turunen-Saaresti Teemu, Grönman Aki, Honkatukia Juha, Backman Jari
Editors of book: Apostolos Pesiridis
Publication year: 2014
Language: English
Title of parent publication: Automotive Exhaust Emissions and Energy Recovery
ISBN: 978-1-63321-493-4
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication

Abstract
Despite the achieved efficiency improvements of diesel and gasoline engines in the last decades a large portion of the fuel power is still wasted in the engine process in form of heat. The interest towards utilizing this waste heat in order to improve the energy efficiency of the system has been increasing in the last few years. One of the most promising technical solutions for converting waste heat into usable energy has been identified as Organic Rankine Cycle (ORC). The principle of the ORC is similar to the conventional steam process. The main idea in most of the ORC-plants is to produce electric power from waste heat. The use of organic fluids provides several benefits compared to conventional steam processes for utilization of waste heat streams in automotive applications. Typical heat sources for ORC applications are the waste heat from combustion engines, gas turbines, and many industrial processes. The commercial ORC system efficiencies are varying from 10 to 20 %, depending on the application, working fluid and the power scale of the process. The efficiency is very dependent of the process temperatures as well as the selected working fluid and therefore a detailed process design is always needed. Most of the commercial ORC applications are having a power output in a range of 50 kW to few MW. The energy of automotive exhausts are low compared to the industrial ORC installations, which means that the automotive ORC would produce about 1 – 30 kW of electric or mechanical power, depending on the size of the engine. The low power introduces challenges related to process component design, mainly the design of the process expander in small scale systems, and further challenges are related to the restricted available space for the process heat exchangers.

Last updated on 2017-08-06 at 16:46