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Technoeconomic analysis of internal combustion engine - organic Rankine cycle systems for combined heat and power in energy-intensive buildings

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Title: Technoeconomic analysis of internal combustion engine - organic Rankine cycle systems for combined heat and power in energy-intensive buildings
Authors: Simpson, M
Chatzopoulou, M
Oyewunmi, O
Le Brun, N
Sapin, P
Markides, C
Item Type: Journal Article
Abstract: For buildings with low heat-to-power demand ratios, installation of internal combustion engines (ICEs) for combined heat and power (CHP) results in large amounts of unused heat. In the UK, such installations risk being ineligible for the CHP Quality Assurance (CHPQA) programme and incurring additional levies. A technoeconomic optimisation of small-scale organic Rankine cycle (ORC) engines is performed, in which the ORC engines recover heat from the ICE exhaust gases to increase the total efficiency and meet CHPQA requirements. Two competing system configurations are assessed. In the first, the ORC engine also recovers heat from the CHP-ICE jacket water to generate additional power. In the second, the ORC engine operates at a higher condensing temperature, which prohibits jacket-water heat recovery but allows heat from the condenser to be delivered to the building. When optimised for minimum specific investment cost, the first configuration is initially found to deliver 20% more power (25.8 kW) at design conditions, and a minimum specific investment cost (1600 £/kW) that is 8% lower than the second configuration. However, the first configuration leads to less heat from the CHP-ICE being supplied to the building, increasing the cost of meeting the heat demand. By establishing part-load performance curves for both the CHP-ICE and ORC engines, the economic benefits from realistic operation can be evaluated. The present study goes beyond previous work by testing the configurations against a comprehensive database of real historical electricity and heating demand for thirty energy-intensive buildings at half-hour resolution. The discounted payback period for the second configuration is found to lie between 3.5 and 7.5 years for all of the buildings considered, while the first configuration is seen to recoup its costs for only 23% of the buildings. The broad applicability of the second configuration offers attractive opportunities to increase manufacturing volumes and reduce unit costs. The findings are relevant to a range of buildings with heat-to-power demand ratios from 20% to 100%.
Issue Date: 1-Nov-2019
Date of Acceptance: 7-Jun-2019
URI: http://hdl.handle.net/10044/1/70504
DOI: 10.1016/j.apenergy.2019.113462
ISSN: 0306-2619
Publisher: Elsevier
Start Page: 1
End Page: 13
Journal / Book Title: Applied Energy
Volume: 253
Copyright Statement: This paper is embargoed until 12 months after publication.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Climate-KIC EIT PhD added value Programme
President's PhD Scholarships
UK Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/P004709/1
Climate-KIC EIT PhD added value Programme
Award number: 1855813
Keywords: 09 Engineering
14 Economics
Publication Status: Published
Online Publication Date: 2019-07-16
Appears in Collections:Chemical Engineering
Faculty of Engineering