Multi-season passive variable insulation for buildings using magnetic thermal diodes

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dc.citation.articleNumber102283en_US
dc.citation.issueNumber11en_US
dc.citation.journalTitleCell Reports Physical Scienceen_US
dc.citation.volumeNumber5en_US
dc.contributor.authorCastelli, Lorenzoen_US
dc.contributor.authorKumar, Monisha Vijayen_US
dc.contributor.authorWehmeyer, Geoffen_US
dc.date.accessioned2025-01-09T20:16:58Zen_US
dc.date.available2025-01-09T20:16:58Zen_US
dc.date.issued2024en_US
dc.description.abstractPassive variable insulation (PVI) could reduce the energy consumption for heating and cooling of buildings compared to traditional static insulation without requiring active control and sensing. However, existing PVI systems are limited to single-season operation. Here, we demonstrate a PVI thermal circuit consisting of two anti-parallel oscillating thermomagnetic diodes that enables passive heating during a warm winter day and passive cooling during a cold summer night. Centimeter-scale prototype experiments show that the PVI has a narrow 4oC temperature regulation band, functions in all gravitational orientations, is durable over >104 oscillation cycles, and has a circuit-level passive thermal switch ratio of 3 under ambient conditions. Thermal modeling over the US climate zones shows that PVI can reduce undesirable building envelope heat flows by up to 47% for base-case parameters, motivating further study of passive variable thermal insulation strategies for the building envelope.en_US
dc.identifier.citationCastelli, L., Kumar, M. V., & Wehmeyer, G. (2024). Multi-season passive variable insulation for buildings using magnetic thermal diodes. Cell Reports Physical Science, 5(11). https://doi.org/10.1016/j.xcrp.2024.102283en_US
dc.identifier.digitalPIIS2666386424005976en_US
dc.identifier.doihttps://doi.org/10.1016/j.xcrp.2024.102283en_US
dc.identifier.urihttps://hdl.handle.net/1911/118111en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial (CC BY-NC) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/en_US
dc.subject.keywordbuilding thermal managementen_US
dc.subject.keywordvariable thermal insulationen_US
dc.subject.keywordthermal diodesen_US
dc.subject.keywordthermal circuitsen_US
dc.subject.keywordthermomagnetic devicesen_US
dc.subject.keywordall-season thermal managementen_US
dc.titleMulti-season passive variable insulation for buildings using magnetic thermal diodesen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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