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Regulative Characteristic of Methanol–Copper Heat Pipes for Asteroid Lander "MASCOT"

Baturkin, Volodymyr and Feidelheimer, Vitali and Sasaki, Kaname and Mikulz, Eugen and Ho, Tra-Mi (2018) Regulative Characteristic of Methanol–Copper Heat Pipes for Asteroid Lander "MASCOT". Joint 19th IHPC and 13th IHPS, Pisa, Italy, June 10-14, 2018, 10--14 June, 2018, Pisa, Italien.

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Official URL: http://www.heatpipe.it

Abstract

Variable conductance heat pipes (VCHPs) are the main part of MASCOT (Mobile Asteroid surface SCOuT) lander thermal control system (TCS). They provide variable conductivity by utilizing the heat transfer limitations. This allows the heat pipes to act as thermal switches without additional constructive elements. The advantage is simplicity and compactness of conventional heat pipe design. Two cylindrical copper-methanol heat pipes with shell length of 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 between −75 and +60 °C. The purpose is to apply this design into the MASCOT thermal control system and to investigate their regulative characteristics and heat transfer limitations. VCHPs show a change of thermal resistivity from 70 K/W, at a heat sink temperature of −60 °C, to 0.8 K/W at a heat sink temperature of +60 °C; with a obtained maximal heat transfer rate 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 wick. Operation of heat pipes as the part of TCS has confirmed their variable thermal properties.

Item URL in elib:https://elib.dlr.de/120601/
Document Type:Conference or Workshop Item (Speech)
Title:Regulative Characteristic of Methanol–Copper Heat Pipes for Asteroid Lander "MASCOT"
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Baturkin, VolodymyrVolodymyr.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) dlr.deUNSPECIFIED
Date:2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:Report 242-825
Status:Published
Keywords:Heat transfer limitations; Variable conductance; Metal fiber wick; Space application; Methanol-Copper.
Event Title:Joint 19th IHPC and 13th IHPS, Pisa, Italy, June 10-14, 2018
Event Location:Pisa, Italien
Event Type:international Conference
Event Dates:10--14 June, 2018
Organizer:Committee of international Heat Pipe Conferences
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project MASCOT Science and operation
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Mechanic and Thermal Systems
Institute of Space Systems > Systems Engineering and Project Office
Deposited By: Baturkin, Volodymyr
Deposited On:27 Jun 2018 12:02
Last Modified:31 Jul 2019 20:18

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