Integrated Computer-Aided Working-Fluid Design and Power System Optimisation: Beyond Thermodynamic Modelling

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Title: Integrated Computer-Aided Working-Fluid Design and Power System Optimisation: Beyond Thermodynamic Modelling
Authors: Oyewunmi, OA
White, MT
Chatzopoulou, M
Haslam, A
Item Type: Conference Paper
Abstract: Improvements in the thermal and economic performance of organic Rankine cycle (ORC) systems are required before the technology can be successfully implemented across a range of applications. The integration of computer-aided molecular design (CAMD) with a process model of the ORC facilitates the combined optimisation of the working-fluid and the power system in a single modelling framework, which should enable significant improvements in the thermodynamic performance of the system. However, to investigate the economic performance of ORC systems it is necessary to develop component sizing models. Currently, the group-contribution equations of state used within CAMD, which determine the thermodynamic properties of a working-fluid based on the functional groups from which it is composed, only derive the thermodynamic properties of the working-fluid. Therefore, these do not allow critical components such as the evaporator and condenser to be sized. This paper extends existing CAMD-ORC thermodynamic models by implementing group-contribution methods for the transport properties of hydrocarbon working-fluids into the CAMD-ORC methodology. Not only does this facilitate the sizing of the heat exchangers, but also allows estimates of system costs by using suitable cost correlations. After introducing the CAMD-ORC model, based on the SAFT-γ Mie equation of state, the group-contribution methods for determining transport properties are presented alongside suitable heat exchanger sizing models. Finally, the full CAMD-ORC model incorporating the component models is applied to a relevant case study. Initially a thermodynamic optimisation is completed to optimise the working-fluid and thermodynamic cycle, and then the component models provide meaningful insights into the effect of the working-fluid on the system components.
Issue Date: 2-Jul-2017
Date of Acceptance: 22-Apr-2017
Publisher: ECOS-2017
Copyright Statement: All publications will be available to the public as well as to the authors free of charge.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Climate-KIC EIT PhD added value Programme
President's PhD Scholarships
Funder's Grant Number: EP/P004709/1
Climate-KIC EIT PhD added value Programme
Conference Name: 30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2017)
Publication Status: Published
Start Date: 2017-07-02
Finish Date: 2017-07-06
Conference Place: Sand Diego, California
Appears in Collections:Faculty of Engineering
Chemical Engineering

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