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Regulative Characteristics of Methanol – Copper Heat Pipes for Asteroid Lander “MASCOT”

Baturkin, Volodya and Feidelheimer, Vitali and Sasaki, Kaname and Mikulz, Eugen and Ho, Tra-Mi (2018) Regulative Characteristics of Methanol – Copper Heat Pipes for Asteroid Lander “MASCOT”. 19th International Heat Pipe Conference (19th IHPC), Pisa, Italy, 10-14.June 2018, Pisa, Italien.

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Abstract

Variable conductance heat pipes (VCHPs) are the main part of MASCOT (Mobile Asteroid surface SCOuT) lander passive thermal control system (TCS). They provide variable conductivity by utilizing the physical heat transfer limitations. This allows the heat pipes to act as thermal switches without additional constructive elements. The advantage is the simplicity and compactness of a conventional heat pipe design. Two cylindrical copper-methanol heat pipes with shell length 0.482 m and 0.438 m and external diameter of 0.006 m, having copper discrete metal fiber wick and copper shell were constructed and verified in the temperature range −75…+60 °C. The purpose is to apply this design into the MASCOT project and to investigate their regulative characteristics and longitudinal physical heat transfer limitations. VCHPs show a change of thermal resistance from 70 K/W, at a sink temperature of −60 °C, to 0.8 K/W at a sink temperature of +60 °C; with an obtained maximal heat transfer rates of 5 W and 16 W, respectively. It is found, that the switching effect of the heat pipes is governed by the sonic velocity limitation, the saturation vapor pressure of the working fluid and the maximal capillary pressure of the fibrous capillary structure.

Item URL in elib:https://elib.dlr.de/119708/
Document Type:Conference or Workshop Item (Speech)
Title:Regulative Characteristics of Methanol – Copper Heat Pipes for Asteroid Lander “MASCOT”
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Baturkin, VolodyaVladimir.Baturkin (at) dlr.deUNSPECIFIED
Feidelheimer, VitaliFeidelheimer, Vitali <vitali.feidelheimer (at) alumni.fh-aachen.de>UNSPECIFIED
Sasaki, KanameKaname.Sasaki (at) dlr.deUNSPECIFIED
Mikulz, EugenEugen.Mikulz (at) dlr.deUNSPECIFIED
Ho, Tra-Mitra-mi.ho (at) dle.deUNSPECIFIED
Date:March 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Heat pipes; Copper-Methanol; Metal fiber wick; Heat transfer limitations; Variable conductance.
Event Title:19th International Heat Pipe Conference (19th IHPC)
Event Location:Pisa, Italien
Event Type:international Conference
Event Dates:Pisa, Italy, 10-14.June 2018
Organizer:Universita di Pisa
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Projekt Mascot (Bus)
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Systems Engineering and Project Office
Deposited By: Baturkin, Volodymyr
Deposited On:19 Apr 2018 09:13
Last Modified:31 Jul 2019 20:17

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