In parallel to further development of the thermoelectric generator (TEG), a great deal of work has been performed for a number of years investigating other recovery concepts and optimising them for mobile use. The transport and storage of heat on board of a vehicle aim to shorten the warm-up phase and to reduce the frictional losses associated with it. In order to achieve benefits in fuel consumption at operating temperatures, recovered energy must, however, be converted into mechanical or electrical work. In addition to the turbo-compound system, a number of thermodynamic cyclical processes in particular show promising results. Here the Stirling cycle shows the highest theoretical level of efficiency, but the actual level of efficiency is significantly lower in the real cycle due to large variances. The greatest benefits of an open Joule system are its simple design and its compact dimensions. However, due to the course of the cycle, it only makes sense to use it with exhaust temperatures above 600 °C. The Rankine cycle can be better adapted to different waste heat temperatures through the appropriate choice of working medium and expansion machine, with the level of the efficiency as a general principle increasing at higher temperatures. One disadvantage of the Rankine cycle for mobile use is that a sufficiently large condenser unit must be accommodated in the vehicle. The choice of the appropriate recovery system also depends on the characteristics of the primary energy converter. The temperature and thus the exergetic share of waste heat also play a role in determining the efficiency of a recuperation system.
Waste Heat Recovery: What are the Alternatives to the thermoelectric Generator?
2013
19 Seiten, 16 Bilder, 1 Tabelle, 7 Quellen
Conference paper
English
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