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Resorcinol formaldehyde xerogels for loop heat pipe applications

Henn, Fabian Alexander and Hesse (geb. Éles), Anna Mária and Ratke, Lorenz and Lütz, Dirk and Schestakow, Maria and Milow, Barbara and Tannert, René (2022) Resorcinol formaldehyde xerogels for loop heat pipe applications. In: International Seminar on Aerogels 2022, p. 13. International Society for the Advancement of Supercritical Fluids. 6th INTERNATIONAL SEMINAR ON AEROGELS 2022, 28-30. Sept. 2022, Hamburg, Deutschland.

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Heat pumps are being targeted in research and development because they represent energy-efficient means of transporting heat. Of particular interest are loop heat pipes (LHPs), passive systems based on continuous evaporation and condensation of a fluid in a closed-loop fashion. One key component in a LHP is the evaporator where the liquid enters at least one tube-shaped porous body (wick) and leaves it as gas through the porous network. While typical wick structures are composed of sintered metal (stainless steel, copper), also polymer-based examples are known to be effective in LHPs. As wicks ideally possess high porosity and pores in the (sub-)micrometer range, xerogels might be efficient candidates for wick development. We report on the production of wick-shaped xerogels based on Fricke-type resorcinol-formaldehyde (RF) xerogels. Beside the synthesis of RF with varying solid content the shaping of monoliths into wick bodies using a sequence of machining processes is presented. Furthermore, the characterization of the material in terms of density, porosity, and bubble point analysis is presented. Studies towards the compatibility of the RF wick with various fluids typically employed in LHPs are demonstrated. Finally, preliminary studies on a generic wick demonstrator housed in stainless steel tubing are presented.

Item URL in elib:https://elib.dlr.de/188752/
Document Type:Conference or Workshop Item (Poster)
Title:Resorcinol formaldehyde xerogels for loop heat pipe applications
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Henn, Fabian AlexanderFabian.Henn (at) dlr.dehttps://orcid.org/0000-0002-9768-399X
Hesse (geb. Éles), Anna Máriaanna.hesse (at) eles.deUNSPECIFIED
Ratke, LorenzLorenz.Ratke (at) dlr.dehttps://orcid.org/0000-0003-2487-4717
Lütz, DirkDirk.Luetz (at) dlr.deUNSPECIFIED
Schestakow, MariaMaria.Schestakow (at) dlr.dehttps://orcid.org/0000-0002-9392-8371
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728
Tannert, RenéRene.Tannert (at) dlr.dehttps://orcid.org/0000-0001-9484-8886
Date:29 September 2022
Journal or Publication Title:International Seminar on Aerogels 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:p. 13
EditorsEmailEditor's ORCID iD
Smirnova, Irinairina.smirnova@tuhh.dehttps://orcid.org/0000-0003-4503-4039
Publisher:International Society for the Advancement of Supercritical Fluids
Series Name:International Seminar on Aerogels
Keywords:loop heat pipes, heat pipes, aerogel, xerogel, resorcinol formaldehyde, gels, aerogel processing, wick structure,
Event Location:Hamburg, Deutschland
Event Type:international Conference
Event Dates:28-30. Sept. 2022
Organizer:TUUH, Hamburg Univeristy of Technology
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC Fahrzeugstruktur II, V - FFAE - Fahrzeugkonzepte, Fahrzeugstruktur, Antriebsstrang und Energiemanagement
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Institute of Materials Research > Mechanical Testing of Materials
Deposited By: Henn, Fabian Alexander
Deposited On:17 Oct 2022 08:16
Last Modified:17 Oct 2022 08:16

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