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Technoeconomic analysis of internal combustion engine – organic Rankine cycle cogeneration systems in energy-intensive buildings

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Title: Technoeconomic analysis of internal combustion engine – organic Rankine cycle cogeneration systems in energy-intensive buildings
Authors: Simpson, M
Chatzopoulou, MA
Oyewunmi, O
Markides, C
Item Type: Conference Paper
Abstract: Organic Rankine cycle (ORC) systems are a promising technology for converting heat to useful power, especially in combined heat and power (CHP) applications with significant quantities of surplus heat that would otherwise be wasted. Beyond the technical performance of these systems, their economic feasibility is crucially important for their wider deployment. In this study, a technoeconomic optimisation of CHP systems is performed in which ORC engines convert heat recovered from internal combustion engines (ICEs), and specifically from both the ICE hot-water output and exhaust-gas stream. The overall aim is to evaluate the impact of the ORC power output and of the components’ design and capital cost on the financial viability of a relevant project, while evaluating a range of candidate working fluids. Results indicate that ORC designs optimised for maximum power output correspond to higher specific investment cost (SIC), with the best performing fluids achieving a SIC of £2100 per kW. In contrast, optimisation for minimum SIC returns values as low as £1700 per kW, or 20% lower. For systems designed and optimised for maximum power, a large fraction of jacket water heat is recovered, while for minimum SIC the utilisation drops to minimise the size and cost of the heat exchangers. The best-performing ORC designs for minimum SIC have discounted payback periods (DPPs) of 4 – 5 years, while those optimised for power output have DPPs of 6 – 7 years, however, the net present values (NPVs) of the latter designs are up to 27% higher than the former. Therefore, there is a trade-off to consider over the project life between high-capacity ORC engines with a high SIC and longer DPP, and designs with minimal SIC but lower power output, shorter DPP and lower NPV. The effect of increasing the amount of hot water required by the building is also analysed, and the ORC engine is shown to be sensitive to this factor for some working fluids.
Issue Date: 1-Feb-2019
Date of Acceptance: 21-Jun-2018
URI: http://hdl.handle.net/10044/1/62206
DOI: https://dx.doi.org/10.1016/j.egypro.2019.01.283
ISSN: 1876-6102
Publisher: Elsevier
Start Page: 2354
End Page: 2359
Journal / Book Title: Energy Procedia
Volume: 158
Copyright Statement: © 2019 The Authors. Published by Elsevier Ltd.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Climate-KIC EIT PhD added value Programme
UK Engineering and Physical Sciences Research Council
Sainsbury's Supermarkets Ltd
Funder's Grant Number: EP/P004709/1
Climate-KIC EIT PhD added value Programme
Award number: 1855813
Conference Name: 10th International Conference on Applied Energy
Publication Status: Published
Start Date: 2018-08-22
Finish Date: 2018-08-25
Conference Place: Hong Kong, China
Open Access location: https://doi.org/10.1016/j.egypro.2019.01.283
Online Publication Date: 2019-03-15
Appears in Collections:Chemical Engineering
Faculty of Engineering