Alkali Metal Loop Heat Pipe Development for Solar Dynamic Energy Conversion

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dc.creatorFereres, Sonia
dc.creatorBonnafous, Bastien
dc.creatorMohaupt, Mikael
dc.creatorLagier, Benjamin
dc.creatorMari, Raphael
dc.creatorDehombreux, Emmanuel
dc.creatorGuraya, Cristina
dc.creatorJimenez, Cristina
dc.creatorAzpiroz, Xabier
dc.creatorDe La Rosa, Sonia
dc.date.accessioned2018-07-07T15:31:16Z
dc.date.available2018-07-07T15:31:16Z
dc.date.issued2018-07-08
dc.descriptionSonia Fereres, Abengoa
dc.descriptionBastien Bonnafous, ESA
dc.descriptionMikael Mohaupt, EuroHeatPipes
dc.descriptionBenjamin Lagier, Airbus Defence & Space
dc.descriptionRaphael Mari, Airbus Defence & Space
dc.descriptionEmmanuel Dehombreux, EuroHeatPipes
dc.descriptionCristina Guraya, Tecnalia
dc.descriptionCristina Jimenez, Tecnalia
dc.descriptionXabier Azpiroz, Tecnalia
dc.descriptionSonia De La Rosa, Abengoa
dc.descriptionICES201: Two-Phase Thermal Control Technology
dc.descriptionThe 48th International Conference on Environmental Systems was held in Albuquerque, New Mexico, USA on 08 July 2018 through 12 July 2018.
dc.description.abstractFuture space exploration missions and outposts on the Moon and Mars would benefit from compact, efficient, high temperature energy conversion devices such as nuclear and solar reactors. In the case of solar dynamic systems, extending operation beyond the hours of solar exposure can be achieved by incorporating Thermal Energy Storage (TES) if the concentrated radiation can be decoupled from the power conversion unit and stored. Conventional heat pipes have been previously developed for this purpose in terrestrial solar receivers and dish-Stirling systems, but the low pumping capacity provided by the capillary structure limits their operational range to horizontal configurations and short distances. Here a high temperature Loop Heat Pipe (LHP) is investigated to transport the concentrated solar radiation from a parabolic dish´s focal point to alternative locations. LHP can perform well at high power, transporting heat over large distances and in different orientations. However, the large power transport (> 10 kW) and high temperature (> 600ºC) requirements of dish-Stirling systems are above current state-of-the-art LHP technology, making this a challenge in terms of materials, fluids, and design. A trade-off study is performed taking into account system requirements, performance and cost, developing a numerical model to determine the most promising solution for a future prototype. The working fluids options at these temperatures are limited to liquid metals: mainly sodium, potassium, and cesium. Although sodium might seem like the most promising working fluid candidate, potassium is anticipated to work better within the system requirements. This paper will show through analysis that, in contrast to conventional LHP where working fluids have negligible thermal conductivity, when using a highly conductive liquid metal the parasitic heat fluxes might be extremely important. This is a novel problem, indicating that design parameter optimization has to be performed differently to ensure proper operation.en_US
dc.identifier.otherICES_2018_159
dc.identifier.urihttp://hdl.handle.net/2346/74136
dc.language.isoengen_US
dc.publisher48th International Conference on Environmental Systemsen_US
dc.subjecthigh temperature loop heat pipe
dc.subjectsolar dynamic
dc.subjectdish-Stirling
dc.subjectworking fluid
dc.subjectliquid alkali metal
dc.titleAlkali Metal Loop Heat Pipe Development for Solar Dynamic Energy Conversionen_US
dc.typePresentationen_US

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