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Virtual Modeling and Optimization of an Organic Rankine Cycle

Chandrasekaran, Vetrivel
http://rave.ohiolink.edu/etdc/view?acc_num=osu1408456065

Abstract Details

2014, Master of Science, Ohio State University, Mechanical Engineering.
Organic Rankine Cycles are used for Waste Heat Recovery from low temperature heat sources. In an Internal Combustion Engine, roughly one-third of the fuel energy is sent out through the exhaust. ORC's were investigated for fuel efficiency improvements for heavy duty trucks in the 70’s during the oil crisis. ORC’s have once again gained interest with the current energy scenario and advances in technology. A recuperated ORC with R245fa as refrigerant is modeled in this thesis using the commercial 1-D simulation software GT-SUITE. The ORC is designed to extract energy from the exhaust of a gasoline powered light duty vehicle. Control inputs for the ORC are pump speed, expander speed and exhaust gas bypass valve position. The exhaust gas is not a steady source of heat, with varying temperature and mass flow rate depending on the operation of the vehicle. To maintain the ORC at a pre-determined operating state, feed-forward maps will be created. Exergy destruction is proposed to be used as a parameter that limits the control effort within reasonable limits. A second law analysis will be performed to identify points of exergy destruction and the ORC will be optimized using a Multi-Objective Particle Swarm Optimization algorithm to generate a Pareto front of net power output and exergy destruction in the system for a single exhaust condition that will allow the decision maker to choose a suitable state for the ORC. The Pareto front will be constructed for other off-design exhaust conditions and the trends will be observed between multiple exhaust gas conditions.
Marcello Canova, PhD (Advisor)
Shawn Midlam-Mohler, PhD (Committee Member)
175 p.
Automotive Engineering
ORC; PSO; Multi-objective optimization; Optimization; GT-POWER; Waste Heat Recovery;

Recommended Citations

Citations

  • Chandrasekaran, V. (2014). Virtual Modeling and Optimization of an Organic Rankine Cycle [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408456065

    APA Style (7th edition)

  • Chandrasekaran, Vetrivel. Virtual Modeling and Optimization of an Organic Rankine Cycle. 2014. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1408456065.

    MLA Style (8th edition)

  • Chandrasekaran, Vetrivel. "Virtual Modeling and Optimization of an Organic Rankine Cycle." Master's thesis, Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408456065

    Chicago Manual of Style (17th edition)

osu1408456065
673
© 2014, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.
Release 3.2.12