Integrated Computer-Aided Working-Fluid Design and Power System Optimisation: Beyond Thermodynamic Modelling
File(s)ECOS2017_Oyewunmietal_R1.pdf (685.47 KB)
Accepted version
Author(s)
Oyewunmi, OA
White, MT
Chatzopoulou, M
Haslam, A
Markides
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.
Date Issued
2017-07-02
Online Publication Date
2017-10-16T13:43:12Z
Date Acceptance
2017-04-22
Publisher
ECOS-2017
Copyright Statement
All publications will be available to the public as well as to the authors free of charge.
Source Database
manual-entry
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Climate-KIC EIT PhD added value Programme
President's PhD Scholarships
Grant Number
EP/P004709/1
Climate-KIC EIT PhD added value Programme
Source
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
Country
Sand Diego, California