Round robin test on the measurement of the specific heat of solar salt
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2017-06-27
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American Institute of Physics Inc.
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Solar salt (SS), a well-known non-eutectic mixture of sodium nitrate (60% w/w) and potassium nitrate (40% w/w), is commonly used either as Thermal Energy Storage (TES) material (double tank technology) or Heat Transfer Fluid (HTF) (solar tower) in modern CSP plants worldwide. The specific heat (cp, kJ kg-1 °C-1) of SS is a very important property in order to support the design of new CSP Plants or develop novel materials based on SS. A high scientific effort has been dedicated to perform a suitable thermophysical characterization of this material. However, there is still a great discrepancy among the cp values reported by different authors1. These differences may be due to either experimental errors (random or systematic) or divergences in the starting material (grade of purity, presence of impurities and/or water). In order to avoid the second source of uncertainty (the starting material), a Round Robin Test (RRT) was proposed starting from a common material. In this way, the different methods from each laboratory could be compared. The study should lay the foundations for the establishment of a systematic procedure for the measurement of the specific heat of this kind of materials. Nine institutions, research centers and companies, accepted the proposal and are contributing with their results. The initiative was organized within the Workshop SolarPACES Task III - Material activity.
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Muñoz-Sánchez , B , Nieto-Maestre , J , González-Aguilar , J , Julia , J E , Navarrete , N , Faik , A , Bauer , T , Bonk , A , Navarro , M E , Ding , Y , Uranga , N , Veca , E , Sau , S , Giménez , P , García , P & Burgaleta , J I 2017 , Round robin test on the measurement of the specific heat of solar salt . in SolarPACES 2016 : International Conference on Concentrating Solar Power and Chemical Energy Systems . , 080017 , AIP Conference Proceedings , vol. 1850 , American Institute of Physics Inc. , 22nd International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2016 , Abu Dhabi , United Arab Emirates , 11/10/16 . https://doi.org/10.1063/1.4984438
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