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    Testing of High Performance Concrete as a Thermal Energy Storage Medium at High Temperatures

    Source: Journal of Solar Energy Engineering:;2014:;volume( 136 ):;issue: 002::page 21004
    Author:
    Skinner, Joel E.
    ,
    Strasser, Matthew N.
    ,
    Brown, Brad M.
    ,
    Panneer Selvam, R.
    DOI: 10.1115/1.4024925
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Concrete is tested as a sensible heat thermal energy storage (TES) material in the temperature range of 400–500 آ°C (752–932 آ°F). A molten nitrate salt is used as the heat transfer fluid (HTF); the HTF is circulated though stainless steel heat exchangers, imbedded in concrete test prisms, to charge the TES system. During charging, significant cracking occurs in both the radial and longitudinal directions in the concrete prisms. The cracking is due to hoop stress induced by the dissimilar thermal strain rates of concrete and stainless steel. A 2D finite element model (FEM) is developed and used to study the stress at the prism/exchanger interface. Polytetrafluoroethylene (PTFE) and a heatcuring, fibered paste (HCFP) are tested as interface materials to mitigate the stress in the concrete. Significant reduction in the size and number of cracks is observed after incorporating interface materials. A heat exchanger with a helical fin configuration is incorporated to improve the heat transfer rate in the concrete. Testing confirms that the fins increase the rate of heat transfer in the concrete; however, large cracks form at each of the fin locations. Only the HCFP is tested as an interface material for the finned heat exchanger. The HCFP decreases the number and size of the cracks, however, not to the desired hairline levels.
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      Testing of High Performance Concrete as a Thermal Energy Storage Medium at High Temperatures

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    http://yetl.yabesh.ir/yetl1/handle/yetl/156253
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    contributor authorSkinner, Joel E.
    contributor authorStrasser, Matthew N.
    contributor authorBrown, Brad M.
    contributor authorPanneer Selvam, R.
    date accessioned2017-05-09T01:12:20Z
    date available2017-05-09T01:12:20Z
    date issued2014
    identifier issn0199-6231
    identifier othersol_136_02_021004.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/156253
    description abstractConcrete is tested as a sensible heat thermal energy storage (TES) material in the temperature range of 400–500 آ°C (752–932 آ°F). A molten nitrate salt is used as the heat transfer fluid (HTF); the HTF is circulated though stainless steel heat exchangers, imbedded in concrete test prisms, to charge the TES system. During charging, significant cracking occurs in both the radial and longitudinal directions in the concrete prisms. The cracking is due to hoop stress induced by the dissimilar thermal strain rates of concrete and stainless steel. A 2D finite element model (FEM) is developed and used to study the stress at the prism/exchanger interface. Polytetrafluoroethylene (PTFE) and a heatcuring, fibered paste (HCFP) are tested as interface materials to mitigate the stress in the concrete. Significant reduction in the size and number of cracks is observed after incorporating interface materials. A heat exchanger with a helical fin configuration is incorporated to improve the heat transfer rate in the concrete. Testing confirms that the fins increase the rate of heat transfer in the concrete; however, large cracks form at each of the fin locations. Only the HCFP is tested as an interface material for the finned heat exchanger. The HCFP decreases the number and size of the cracks, however, not to the desired hairline levels.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleTesting of High Performance Concrete as a Thermal Energy Storage Medium at High Temperatures
    typeJournal Paper
    journal volume136
    journal issue2
    journal titleJournal of Solar Energy Engineering
    identifier doi10.1115/1.4024925
    journal fristpage21004
    journal lastpage21004
    identifier eissn1528-8986
    treeJournal of Solar Energy Engineering:;2014:;volume( 136 ):;issue: 002
    contenttypeFulltext
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