elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Comparative study on hydrogen issues of biphenyl/diphenyl oxide and polydimethylsiloxane heat transfer fluids

Jung, Christian and Senholdt, Marion (2020) Comparative study on hydrogen issues of biphenyl/diphenyl oxide and polydimethylsiloxane heat transfer fluids. In: 2019 International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2019, 2303, 0028894. American Institute of Physics Inc.. 2019 International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2019, 2019-10-01 - 2019-10-04, Daegu, Südkorea. doi: 10.1063/5.0028894. ISBN 978-073544037-1. ISSN 0094-243X.

[img] PDF
841kB

Official URL: https://aip.scitation.org/doi/abs/10.1063/5.0028894

Abstract

The formation of hydrogen from new and several used qualities of eutectic biphenyl (BP) and diphenyl oxide (DPO) mixture was investigated with an established lab experiment in the range of 380 – 410 °C and 410 – 430 °C respectively. Kinetic evaluations show that hydrogen formation increases not only with temperature but also with time. Field samples extracted after 5 and 10 years’ operating time confirm an increase of hydrogen formation with operating. A thermal aging study at 430 °C for 480 hours with a series of samples composed of new BP/DPO each doped with a degradation product indicates that the formation of phenol is the mayor driving factor for steadily increase with time. The impact of hydrogen formation on the concentration in the fluids of parabolic trough systems was checked with a simplified model that takes volumetric dimensions, residence time at maximum temperature, back mixing with fluid from overflow vessels and some assumed hydrogen removal step into account. New BP/DPO at 400 °C and polydimethylsiloxane (PDMS) at 425 °C is compared. After initially higher formation of hydrogen, in the long term low hydrogen formation is reported for PDMS. Although PDMS is considered at significantly higher operating temperature lower hydrogen concentrations are to be expected for this fluid after a starting-up phase in the model system. Accordingly, hydrogen control with PDMS is expected to be easier with PDMS fluids like HELISOL® 5A as no steady increase of effort on hydrogen removal will be required.

Item URL in elib:https://elib.dlr.de/192142/
Document Type:Conference or Workshop Item (Speech)
Title:Comparative study on hydrogen issues of biphenyl/diphenyl oxide and polydimethylsiloxane heat transfer fluids
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Jung, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-5893-4979UNSPECIFIED
Senholdt, MarionUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:11 November 2020
Journal or Publication Title:2019 International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:2303
DOI:10.1063/5.0028894
Page Range:0028894
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
Richter, ChristophUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Publisher:American Institute of Physics Inc.
ISSN:0094-243X
ISBN:978-073544037-1
Status:Published
Keywords:Solar thermal parabolic trough power plant, heat transfer fluid, biphenyl, diphenyl ether, diphenyl oxide, Dowtherm A, Diphyl, Therminol VP-1, silicone oil, polydimethyl siloxane, BP/DPO, PDMS, solar receiver, hydrogen
Event Title:2019 International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2019
Event Location:Daegu, Südkorea
Event Type:international Conference
Event Start Date:1 October 2019
Event End Date:4 October 2019
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Chemical Energy Carriers
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Future Fuels > Chemical and Physical Fundamentals
Deposited By: Jung, Dr.rer.nat. Christian
Deposited On:14 Dec 2022 09:35
Last Modified:24 Apr 2024 20:53

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.