Computer-aided working fluid design and optimisation of organic Rankine cycle (ORC) systems under varying heat-source conditions
File(s)
Submitted version
Author(s)
Ibrahim, Dauda
Oyewunmi, oyeniyi
Haslam, Andrew
Pantaleo, Antonio
Markides, Christos
Type
Conference Paper
Abstract
A new two-level systematic framework for the simultaneous design of optimal working fluid (based on computer-aided molecular design technique) and organic Rankine cycle system considering off-design operation is proposed. The framework is applied to the design of organic Rankine cycle systems for the recovery of waste-heat (with temperatures and flowrates varying between 682 – 727 K and 2.16 – 1.29 kg/s) from the exhaust gas of an internal combustion engine (ICE). In Level 1 – the system design stage – potential ORC architectures together with the associated working fluids and heat exchanger designs are proposed by minimising the investment costs. These designs are then passed on to Level 2 (the off-design stage) as constraints, where their power output at each off-design operating point is maximised. This enables a comparison of the proposed designs and an optimal design – the one with a good power potential at off-design conditions and the best average specific investment costs – is then selected to deliver 167 kW at a minimal cost of £2450 per kW, operating on hexatriene working fluid. Finally, a performance map for the optimal ORC system is constructed, allowing the system performance to be determined over the entire heat source variability space.
Date Issued
2019-06-23
Date Acceptance
2019-05-17
Citation
Proceedings of ECOS 2019, 2019, pp.1749-1760
ISBN
978-1-7138-0329-4
Publisher
Curran Associates, Inc.
Start Page
1749
End Page
1760
Journal / Book Title
Proceedings of ECOS 2019
Copyright Statement
Copyright© (2019) by Silesian University of Technology - Institute of Thermal Technology All rights reserved.
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/P004709/1
Source
32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2019)
Publication Status
Published
Start Date
2019-06-23
Finish Date
2018-06-28
Coverage Spatial
Wroclaw, Poland