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Off-design comparison of subcritical and partial evaporating ORCs in quasi-steady state annual simulations

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Title: Off-design comparison of subcritical and partial evaporating ORCs in quasi-steady state annual simulations
Authors: Lecompte, S
Chatzopoulou, MA
Markides, C
De Paepe, M
Item Type: Conference Paper
Abstract: The subcritical ORC (SCORC) is considered the industry standard due to its simple configuration, acceptable efficiency and low cost s. However , it is known that alternative ORC configurations have the potential to increase efficiency. A cycle modification which closely resembles the SCORC is the partial evap orati ng ORC (PEORC), where a two -phase mixture of liquid -vapour enters the expander instead of superheated vapour. In theoretical studies at design conditions , higher power outputs are achieved for the PEORC compared to the SCORC. This work aims to go a step further by investigating the performance of the SCORC and PEORC under time -dependent operating conditions. A direct comparison between the SCORC and PEORC is made for identically sized systems using as input the waste heat stream of a waste incinerator plant and the changing ambient conditions . Performance maps of both cycle configurations are compiled and the benefit of an expander operating at variable speed is briefly discussed . The results indicate that for the specific case under investigati on, the PEORC has an increased annual ly averaged net power output of 9.6% compared to the SCORC. Use of annually averaged input conditions result s in an overestimation of the net power output for both the SCORC and PEORC, and furthermore , the relative improvement in power output for the PEORC is reduced to 6.8%. As such, the use of time -averaged conditions when comparing cycle architectures should preferably be avoided.
Issue Date: 15-Mar-2019
Date of Acceptance: 10-Jun-2018
URI: http://hdl.handle.net/10044/1/62113
DOI: 10.1016/j.egypro.2019.01.477
ISSN: 1876-6102
Publisher: Elsevier
Start Page: 2064
End Page: 2069
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: Climate-KIC EIT PhD added value Programme
President's PhD Scholarships
UK Engineering and Physical Sciences Research Council
Funder's Grant Number: Climate-KIC EIT PhD added value Programme
Award number: 1855813
Conference Name: ICAE2010 - 10th International Conference on Applied Energy
Keywords: Science & Technology
Energy & Fuels
organic rankine cycle
subcritical ORC
partial evaporating ORC
cycle architectures
quasi-steady state
0904 Chemical Engineering
0906 Electrical and Electronic Engineering
Publication Status: Published
Start Date: 2018-08-22
Finish Date: 2018-08-25
Conference Place: Hong Kong
Online Publication Date: 2019-03-15
Appears in Collections:Chemical Engineering
Faculty of Engineering