Passive Magnetic Heat Switch for Thermal Management of Lunar Spacecraft

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dc.contributor.advisorWehmeyer, Geoffrey
dc.creatorGarg, Ajay A
dc.date.accessioned2023-01-04T16:42:20Z
dc.date.available2023-01-04T16:42:20Z
dc.date.created2022-12
dc.date.issued2022-12-01
dc.date.submittedDecember 2022
dc.date.updated2023-01-04T16:42:20Z
dc.description.abstractThis thesis discusses our design of the Passive Magnetic Heat Switch (PMHS). This project, funded by NASA, looks for new, low TRL heat switches for Lunar Rover applications. The novelty of the PMHS is its ability to switch near room temperature by using temperature dependent magnets. The PMHS is a gap closure heat switch where the ON state mates highly polished copper surfaces and the OFF state de-mates the surfaces. We use commercial neodymium magnets to close the gap in the ON state and gadolinium, which has a Curie temperature of 20 °C, to achieve the OFF state. All experiments were performed under high vacuum and reasonably agree with our FEA models. The PMHS turns ON at 28.5 °C and turns OFF at 15.5 °C. The ON and OFF state conductances, are 0.153 WK-1 and 0.0099 WK-1 respectively. The switch ratio, which is the figure of merit for all heat switches, is 15.5:1.
dc.format.mimetypeapplication/pdf
dc.identifier.citationGarg, Ajay A. "Passive Magnetic Heat Switch for Thermal Management of Lunar Spacecraft." (2022) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/114208">https://hdl.handle.net/1911/114208</a>.
dc.identifier.urihttps://hdl.handle.net/1911/114208
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectSwitch Ratio
dc.subjectConductance
dc.subjectMagnet
dc.subjectPMHS
dc.titlePassive Magnetic Heat Switch for Thermal Management of Lunar Spacecraft
dc.typeThesis
dc.type.materialText
thesis.degree.departmentMechanical Engineering
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
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