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Thermo-economic evaluation of actively selected siloxane mixtures in a hybrid solar-biomass organic Rankine cycle power plant

Title data

Oyekale, Joseph Oyetola ; Heberle, Florian ; Petrollese, Mario ; Brüggemann, Dieter ; Cau, Giorgio:
Thermo-economic evaluation of actively selected siloxane mixtures in a hybrid solar-biomass organic Rankine cycle power plant.
In: Applied Thermal Engineering. Vol. 165 (25 January 2020) . - No. 114607.
ISSN 1359-4311
DOI: https://doi.org/10.1016/j.applthermaleng.2019.114607

Abstract in another language

This study aims to evaluate thermo-economic implications of implementing siloxane mixtures as organic Rankine cycle (ORC) working fluids for hybrid solar-biomass applications. Next to active selection of suitable mixtures and their thermodynamic evaluations, ORC components were sized under process conditions of different fluid studied. The main paper contribution concerns integrated off-design economic analysis of working-fluid mixtures in ORC. By comparing the studied mixtures with pure MM (hexamethyldisiloxane), results showed that 0.9MM/0.1MDM (octamethyltrisiloxane) and 0.8MM/0.2MDM increase net ORC power by 2 and 1.4 respectively, while 0.1MM/0.9MDM reduces net power by 1.3. Also, specific exergy cost of power production increases by 3.7, 1.9 and 1 for 0.1MM/0.9MDM, 0.8MM/0.2MDM and 0.9MM/0.1MDM, respectively. Furthermore, after implementing off-design models, increase in annual net energy production of 2.3, 3.2 and 5.2 were obtained for 0.1MM/0.9MDM, 0.8MM/0.2MDM and 0.9MM/0.1MDM, respectively. However, these thermodynamic advantages do not translate to better economic performance. Exemplarily for the most thermodynamically efficient mixture (0.9MM/0.1MDM), levelized cost of electricity and specific payback period increase by 8 and 13 respectively, while net present value reduces by 15.7, relative to pure MM. Thus, caution should be exercised when considering the use of selected siloxane mixtures as ORC working fluid in high-temperature applications such as solar/biomass.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Organic Rankine cycle; Siloxane mixtures; Renewable power plant; Thermo-economic analysis; Concentrated solar powe;, Hybrid solar-biomass plant
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes
Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes > Chair Engineering Thermodynamics and Transport Processes - Univ.-Prof. Dr.-Ing. Dieter Brüggemann
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Faculties
Faculties > Faculty of Engineering Science
Profile Fields
Profile Fields > Emerging Fields
Research Institutions
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 29 Nov 2019 14:36
Last Modified: 04 Dec 2019 08:14
URI: https://eref.uni-bayreuth.de/id/eprint/53401