Publication

Installation, instrumentation and testing of an exhaust gas heat recuperator for hybrid cycle

Thomas Wicht
2011
Student project
Abstract

This report presents the work done in the frame of a Minor in Energy project in the school of Mechanical Engineering at the Swiss Institute of Technology of Lausanne (EPFL), in order to obtain 10 ECTS credits. It is to install, instrument and test an exhaust gas heat recuperator and to assess its performances. The project fits into the topic of hybrid cycles based on fuel cells and inverted Brayton-Joule cycles. The system is first presented and the instrumentation is detailed. The tests are then described and the results are presented and discussed. The heat exchanger appears to be very large versus the gas flowrate and the flue gases are cooled down to low temperatures. The condensation is an issue and the condensed water collection system is not efficient, leading to problems in doing power estimations. Finally some possible improvements of the system are proposed and described. A smaller heat exchanger is also computed and presented as an example.

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Related concepts (32)
Hybrid vehicle
A hybrid vehicle is one that uses two or more distinct types of power, such as submarines that use diesel when surfaced and batteries when submerged. Other means to store energy include pressurized fluid in hydraulic hybrids. Hybrid powertrains are designed to switch from one power source to another to maximize both fuel efficiency and energy efficiency. In hybrid electric vehicles, for instance, the electric motor is more efficient at producing torque, or turning power, while the combustion engine is better for maintaining high speed.
Hybrid vehicle drivetrain
Hybrid vehicle drivetrains transmit power to the driving wheels for hybrid vehicles. A hybrid vehicle has multiple forms of motive power. Hybrids come in many configurations. For example, a hybrid may receive its energy by burning gasoline, but switch between an electric motor and a combustion engine. Electrical vehicles have a long history combining internal combustion and electrical transmission - as in a diesel–electric power-train - although they have mostly been used for rail locomotives.
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The hybrid sulfur cycle (HyS) is a two-step water-splitting process intended to be used for hydrogen production. Based on sulfur oxidation and reduction, it is classified as a hybrid thermochemical cycle because it uses an electrochemical (instead of a thermochemical) reaction for one of the two steps. The remaining thermochemical step is shared with the sulfur-iodine cycle. The Hybrid sulphur cycle (HyS)was initially proposed and developed by Westinghouse Electric Corp. in the 1970s, so it is also known as the "Westinghouse" cycle.
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