Performance of working-fluid mixtures in an ORC-CHP system for waste-heat recovery
File(s)
Submitted version
Author(s)
Oyewunmi, OA
Kirmse, CJW
Markides, CN
Type
Conference Paper
Abstract
Organic Rankine cycle (ORC) power systems are being increasingly deployed for waste heat recovery and conversion to power in several industrial settings. In the present paper, we investigate the deployment of working-fluid mixtures in ORCs operating in combined heat and power mode (ORC-CHP) with shaft power provided by the expanding working fluid and heating provided by the cooling-water exiting the ORC condenser. Using the flue gas from a refinery boiler as the waste-heat source and with working fluids comprising normal alkanes, refrigerants and their subsequent mixtures, the ORC-CHP system is demonstrated as being capable of delivering over 20 MW of net shaft power and up to 15 MW of heating, leading to a fuel energy savings ratio (FESR) in excess of 20%. Single-component working fluids such as pentane appear to be optimal at low hot-water supply temperatures. Working-fluid mixtures become optimal at higher temperatures, with the working-fluid mixture combination of octane and pentane giving an ORC-CHP system design with the highest efficiency.
Date Issued
2016-01-19
Date Acceptance
2016-06-01
Citation
Proceedings of the 29th International Conference on Efficiency, Cost, Optimisation, Simulation and Environmental Impact of Energy Systems, 2016, pp.2628-2639
ISBN
9789616980159
Publisher
University of Ljubljana.
Start Page
2628
End Page
2639
Journal / Book Title
Proceedings of the 29th International Conference on Efficiency, Cost, Optimisation, Simulation and Environmental Impact of Energy Systems
Copyright Statement
© 2016 University of Ljubljana.
Source
ECOS 2016
Publication Status
Published
Start Date
2016-06-19
Finish Date
2016-06-23
Coverage Spatial
Portorož, Slovenia