Wax-actuated heat switch for Mars surface applications

Sunada, Eric; Lankford, Kurt; Pauken, Michael; Novak, Keith; Birur, Gajanana C.

doi:10.1063/1.1449727

Cited by 15 publications

(5 citation statements)

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“…In 2002, Sunada et al. demonstrated the wax-actuated heat switches to support Mars rover’s battery having an allowable temperature range between −20 and +30 °C, whereas a Mars diurnal temperature can vary by over 100 °C during the daytime to −100 °C at night. , Since then, various attempts have been made to improve the design and the switching performance. − While researchers achieved varying degrees of success, the thermal switches developed in the past have been targeted for specialized applications, primarily for thermal management in spacecrafts. The passive thermal switches developed in this study have been designed for various generic applications near room temperature, particularly for the insulation system used in building envelopes, electronics, home appliances, and industrial heat pipes.…”

Section: Introductionmentioning

confidence: 99%

Contact-Based Passive Thermal Switch with a High Rectification Ratio

Kommandur

Kishore

2022

ACS Eng. Au

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Thermal control devices like diodes, regulators, and switches are essential to achieve directional heat flow for numerous applications, such as electronic systems, energy conversion or storage systems, and equipment for buildings. These devices exhibit a controllable thermal conductance that can be manipulated to allow preferential thermal transport. While several design concepts have existed for decades, they are rarely deployed due to some basic practical limitations related to scalability, cost, operating temperature, and/or requirements for external excitation. In this study, we achieved a fundamental breakthrough in developing a passive thermal switch, which has a simple and scalable design, is thermally driven (thus does not require an external stimulus), and exhibits a rectification ratio of 17.5, which is among the highest value reported for passive switches in the literature. Notably, the switch transitions from an effective thermal conductivity of ∼1.6 W/m-K (insulator) in the OFF state to ∼28 W/m-K (conductor) in the ON state near 50 °C. To demonstrate the cost-effective implementation of our technology at a large scale, we developed a self-regulating insulation panel that automatically varies its thermal resistance by using just a few thermal switches occupying less than 10% of the total surface area. Lastly, using a parametric analysis, we establish a promising pathway to further improve the performance and versatility of the proposed technology.

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Section: Introductionmentioning

confidence: 99%

Contact-Based Passive Thermal Switch with a High Rectification Ratio

Kommandur

Kishore

2022

ACS Eng. Au

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“…On the design of the passive thermal switch, bimetallic actuation, unidirectional micro‐expansion, bidirectional micro‐expansion, phase transition, a shape memory effect of material, magnetocaloric technology have been adopted to achieve the temperature control. A contact mechanism is widely used for the realization of the devices, for example, the traditional micro‐expansion based devices control the ON/OFF states of a thermal circuit by intriguing thermal expansion of a material.…”

Section: Introductionmentioning

confidence: 99%

A Passive Thermal Switch with Kirigami‐Inspired Mesostructures

Heo

Bao

et al. 2019

Adv Eng Mater

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The objective of this work is to design a passive thermal switch with Kirigami-inspired architected materials composed of bilayer hinges and to analyze thermomechanical and thermal performance at the ON/OFF states based on a composition of materials and geometry of metamaterials. Analytical models are constructed to determine the thermal deformation and heat transport of the metamaterial, followed by finite element-based simulations. A two-step design approach À i) selection of multi-materials and ii) geometric modification of mesostructures provides a robust method for the design of a passive thermal switch with Kirigami-inspired metamaterials. The mesostructures designed have potential as a passive thermal switch enabling to engineer a large thermal deformation, a small thermal resistance, and a sizable thermal switch ratio. With a systematic approach, this work demonstrates that Kirigami structures with multi-materials can be potentially used for a tool of thermal transport.

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“…Monitoring clean room and hardware organic cleanliness is currently a complex process often involving multiple, expensive and time-consuming techniques. [Task Group on the Forward Contamination of Europa, 2000;Mahaffy et al, 2003;Blakkolb et al, 2014;Li et al, 2015]. Effective monitoring is confounded further by the fact that, in contrast to biological contamination, there are currently no strictly defined quantitative limits for organic contamination control.…”

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confidence: 99%

“…Good examples of organic cleanliness monitoring are available from missions to Mars. Multi-stepped solvent extraction, followed by pre-concentration of analytes (by evaporation) and analysis by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, Fourier transform infrared (FTIR) spectroscopy and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) techniques were carried out on swabs from surfaces of the MSL sample transfer chain hardware at various stage of construction [Blakkolb et al, 2014]. The use of multiple solvents, however, complicated the analysis of the data and diluted the contaminants of interest, reducing sensitivity of the detection.…”

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confidence: 99%

Solid Phase Micro Extraction: Potential for Organic Contamination Control for Planetary Protection of Life-Detection Missions to the Icy Moons of the Outer Solar System

et al. 2019

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Conclusively detecting, or ruling out the possibility of, life on the icy moons of the outer solar system will require spacecraft missions to undergo rigorous planetary protection and contamination control procedures to achieve detectable compounds, SPME can also be used in conjunction with high performance liquid chromatography/liquid chromatography-mass spectrometry systems suitable for polar analytes [Kataoka et al., 2000]. Thus, our SPME method presents an opportunity to monitor organic contamination in a relatively rapid and routine way that produces information-rich data sets.

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Wax-actuated heat switch for Mars surface applications

Cited by 15 publications

References 0 publications

Contact-Based Passive Thermal Switch with a High Rectification Ratio

Contact-Based Passive Thermal Switch with a High Rectification Ratio

A Passive Thermal Switch with Kirigami‐Inspired Mesostructures

Solid Phase Micro Extraction: Potential for Organic Contamination Control for Planetary Protection of Life-Detection Missions to the Icy Moons of the Outer Solar System

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