Abstract
Due to environmental safety and miniaturization requirement along with better temperature matching with heat source, CO2 transcritical power cycle (CTPC) has recently been gaining a lot of attention for application to waste heat recovery from internal combustion engines. In this paper, a constructed kW-scale CTPC system was dynamically tested to extract energy from exhaust gas of a heavy-duty diesel engine. The preliminary experiments were conducted under engine condition (1100 rpm, 50% load) with two operating modes: the constant valve opening and the constant pump speed. In order to characterise the dynamic process, the measuring system recorded data every second and also time constant and settling time are employed in data processing. The results show that valve inlet pressure follows the external changes timely, while temperatures respond a little slowly. The time constant of the current system is rather small showing from 20 to 25 seconds, which indicates an excellent capability of CTPC system of dealing with highly transient heat sources. In addition, predicted net power output and thermal efficiency show an upward trend with the increase of pressure ratio. Within the scope of these tests, CTPC system expects a maximum net power output of 1.34 kW and a maximum thermal efficiency of 3.54%.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
