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    Thermocline Bed Properties for Deformation Analysis

    Source: Journal of Solar Energy Engineering:;2014:;volume( 136 ):;issue: 004::page 41002
    Author:
    Iverson, Brian D.
    ,
    Bauer, Stephen J.
    ,
    Flueckiger, Scott M.
    DOI: 10.1115/1.4027287
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Thermocline tanks have been considered as an alternative to traditional twotank molten salt thermal storage in concentrating solar power systems due to their potential for cost reduction. One concern for thermocline usage is thermal ratcheting caused by the internal rock bed deformation during cyclic operation and significant temperature fluctuations. Thermal ratcheting studies have been performed in the literature to identify the possibility of tank rupture. However, these studies numerically modeled the ratcheting behavior utilizing bed properties that have never been measured for the materials used in thermocline storage systems. This work presents triaxial test data quartzite and silica thermocline filler materials to better inform future investigations of thermal ratcheting. Molten salt is replaced with water as the interstitial fluid due to similarity in dimensionless numbers and to accommodate room temperature measurement. Material property data for cohesion, dilatancy angle, internal angle of friction, Young's modulus, Poisson's ratio, and bulk modulus are presented for 0.138–0.414 MPa confining pressure. The material properties are then compared to those assumed in the literature to comment on the potential impact of this property data relative to thermal ratcheting.
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      Thermocline Bed Properties for Deformation Analysis

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/156308
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    • Journal of Solar Energy Engineering

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    contributor authorIverson, Brian D.
    contributor authorBauer, Stephen J.
    contributor authorFlueckiger, Scott M.
    date accessioned2017-05-09T01:12:30Z
    date available2017-05-09T01:12:30Z
    date issued2014
    identifier issn0199-6231
    identifier othersol_136_04_041002.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/156308
    description abstractThermocline tanks have been considered as an alternative to traditional twotank molten salt thermal storage in concentrating solar power systems due to their potential for cost reduction. One concern for thermocline usage is thermal ratcheting caused by the internal rock bed deformation during cyclic operation and significant temperature fluctuations. Thermal ratcheting studies have been performed in the literature to identify the possibility of tank rupture. However, these studies numerically modeled the ratcheting behavior utilizing bed properties that have never been measured for the materials used in thermocline storage systems. This work presents triaxial test data quartzite and silica thermocline filler materials to better inform future investigations of thermal ratcheting. Molten salt is replaced with water as the interstitial fluid due to similarity in dimensionless numbers and to accommodate room temperature measurement. Material property data for cohesion, dilatancy angle, internal angle of friction, Young's modulus, Poisson's ratio, and bulk modulus are presented for 0.138–0.414 MPa confining pressure. The material properties are then compared to those assumed in the literature to comment on the potential impact of this property data relative to thermal ratcheting.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleThermocline Bed Properties for Deformation Analysis
    typeJournal Paper
    journal volume136
    journal issue4
    journal titleJournal of Solar Energy Engineering
    identifier doi10.1115/1.4027287
    journal fristpage41002
    journal lastpage41002
    identifier eissn1528-8986
    treeJournal of Solar Energy Engineering:;2014:;volume( 136 ):;issue: 004
    contenttypeFulltext
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