Variable Conductance Heat Pipes for Radioisotope Stirling Systems

Anderson, William G.; Tarau, Calin

doi:10.1063/1.2845031

Cited by 17 publications

(5 citation statements)

References 1 publication

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“…In addition, if an external temperature control unit is set around the gas reservoir to control the NCG volume and pressure, the VCHP can act as an active thermal switch. 188 The gas blockage VCHP has been used for temperature control in spacecraft 188 and vehicle 189 components. Figure 9(b) compares experimental data from Leriche et al 189 for an ordinary heat pipe and a VCHP.…”

Section: Convection Thermal Regulatorsmentioning

confidence: 99%

Thermal diodes, regulators, and switches: Physical mechanisms and potential applications

Wehmeyer

Yabuki

Monachon

et al. 2017

Applied Physics Reviews

377

261

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Interest in new thermal diodes, regulators, and switches has been rapidly growing because these components have the potential for rich transport phenomena that cannot be achieved using traditional thermal resistors and capacitors. Each of these thermal components has a signature functionality: Thermal diodes can rectify heat currents, thermal regulators can maintain a desired temperature, and thermal switches can actively control the heat transfer. Here, we review the fundamental physical mechanisms of switchable and nonlinear heat transfer which have been harnessed to make thermal diodes, switches, and regulators. The review focuses on experimental demonstrations, mainly near room temperature, and spans the fields of heat conduction, convection, and radiation. We emphasize the changes in thermal properties across phase transitions and thermal switching using electric and magnetic fields. After surveying fundamental mechanisms, we present various nonlinear and active thermal circuits that are based on analogies with well-known electrical circuits, and analyze potential applications in solid-state refrigeration and waste heat scavenging.

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Section: Convection Thermal Regulatorsmentioning

confidence: 99%

Thermal diodes, regulators, and switches: Physical mechanisms and potential applications

Wehmeyer

Yabuki

Monachon

et al. 2017

Applied Physics Reviews

377

261

View full text Add to dashboard Cite

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“…Heat pipe applications range from the cooling of consumer electronics such as laptops [1,2] to thermal management of spacecraft [3]; proposed uses include turbine blade and high speed aircraft wing cooling [2]. A heat pipe generally consists of an evaporator (heat input), a condenser (heat output), and an adiabatic (heat transport) region.…”

Section: Introductionmentioning

confidence: 99%

Analysis of internal and external thermal resistances of heat pipes including fins using a three-dimensional numerical simulation

Poplaski

Faghri

Bergman

2016

International Journal of Heat and Mass Transfer

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a b s t r a c tA complete thermal network analysis for a cylindrical heat pipe is presented and the dominant thermal resistances are identified. The proposed numerical model was developed to simulate heat pipe operation and has been verified for both low and high applications including heat sources and sinks as a singledomain conjugate problem. Steady-state and transient solution methods were performed for a threedimensional heat pipe with a compressible vapor core and a wick governed by pure conduction. The numerical model accounts for the full external coolant domain, with and without external fins on the condenser, to investigate their influence on the thermal resistance network. The numerical results indicate that the overall heat pipe thermal resistances can be predicted with as little as 1%-28% variation from empirical correlations, based on the choice of heat pipe dimensions, materials and operating conditions. It was found that the vapor core thermal resistance can become significant as the operating temperature increases, however, the largest thermal resistances are those corresponding to the external heat transfer fluids.

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“…These heat pipes serve situations with a wider range of operating temperatures or, in some cases, contexts with delicate temperature requirements. Some may even operate in conjunction with a Stirling cycle machine for temperature control [9]. Sowale and Kolios proposed a novel approach to the numerical examination of the quasi-steady model of the gamma-type free piston Stirling engine, including the thermodynamic analysis of the heat exchangers [10].…”

Section: Introductionmentioning

confidence: 99%

A U-Shaped Oscillatory Liquid Piston Compression Air Conditioner Driven by Rotary Displacer Stirling Engine

2020

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A rotary displacer, Stirling engine-driven, oscillatory liquid piston-compression air conditioning unit is analyzed, designed, and conceptually proved by experiments on its cooling capability and performance efficiency. The engine itself aims to work compatibly with a conventional solar water heater as its power source, with a rotary displacer to manipulate its operation frequency. A U-shaped, oscillatory liquid piston, with the cylinder chamber vented to low pressure, aims to both reduce the sealing friction and serve as the refrigerant. During the experiments, the engine is fed with an electrically heated hot bath whose temperature profile is determined according to a field test of solar thermal collectors in summer conditions. Experimental results show that the coefficient of performance (COP) of the oscillatory liquid piston air conditioning unit would be in the range of 1.3 to 1.5.

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Variable Conductance Heat Pipes for Radioisotope Stirling Systems

Cited by 17 publications

References 1 publication

Thermal diodes, regulators, and switches: Physical mechanisms and potential applications

Thermal diodes, regulators, and switches: Physical mechanisms and potential applications

Analysis of internal and external thermal resistances of heat pipes including fins using a three-dimensional numerical simulation

A U-Shaped Oscillatory Liquid Piston Compression Air Conditioner Driven by Rotary Displacer Stirling Engine

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