Investigation of waste heat recovery system at supercritical conditions with vehicle drive cycles

Chowdhury, Jahedul Islam, Nguyen, Bao Kha and Thornhill, David (2017) Investigation of waste heat recovery system at supercritical conditions with vehicle drive cycles. Journal of Mechanical Science and Technology, 31 (2). pp. 932-936. ISSN 1738-494X

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Abstract

Waste heat recovery (WHR) for internal combustion engines in vehicles using Organic Rankine cycle (ORC) has been a promising technology. The operation of the ORC WHR system in supercritical conditions has a potential to generate more power output and thermal efficiency compared with the conventional subcritical conditions. However, in supercritical conditions, the heat transfer process in the evaporator, the key component of the ORC WHR system, becomes unpredictable as the thermo-physical properties of the working fluid change with the temperature. Furthermore, the transient heat source from the vehicle’s exhaust makes the operation of the WHR system difficult. We investigated the performance of the ORC WHR system at supercritical conditions with engine’s exhaust data from real city and highway drive cycles. The effects of operating variables, such as refrigerant flow rates, evaporator and condenser pressure, and evaporator outlet temperature, on the performance indicators of the WHR system in supercritical conditions were examined. Simulation of operating parameters and the boundary of the WHR system are also included in this paper.

Item Type: Article
Keywords: Finite volume method, Organic Rankine cycle, Supercritical conditions, Waste heat recovery
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TJ Mechanical engineering and machinery > TJ0163.26 Energy conservation
T Technology > TJ Mechanical engineering and machinery > TJ0212 Control engineering systems. Automatic machinery (General)
T Technology > TJ Mechanical engineering and machinery > TJ0751 Miscellaneous motors and engines Including gas, gasoline, diesel engines
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2896 Devices for production of electricity by direct energy conversion
Depositing User: Bao Kha Nguyen
Date Deposited: 17 Jul 2017 06:38
Last Modified: 01 Dec 2017 09:41
URI: http://sro.sussex.ac.uk/id/eprint/69254

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