Development and Investigation of Nitrate Phase Change Filler Material for Solar Process Heating Applications

SolarPACES Conference Proceedings Pub Date : 2024-07-24 DOI:10.52825/solarpaces.v2i.917

N. Pradeep, K.S. Reddy

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Abstract

Thermocline thermal energy storage system is an imperial system for solar process heating applications. The thermal energy storage system comprises filler material and heat transfer fluid. In the present study, the commercial phase change material (PCM) (filler material) solar salt (60%NaNO3+40%KNO3) is synthesized, and it is encapsulated with a 1mm thickness of stainless steel 316L encapsulation with the macro-size of 60mm; the encapsulated PCMs is considered as a single particle in the thermocline thermal energy storage system. The performance of the single encapsulated PCM is studied with a constant heat transfer fluid (Therminol-VP1) flow rate of 0.00015 kg/s during the charging process. The specific heat of the solar salt is measured in Differential Scanning Calorimeter (DSC) in the solid phase is found as 1.381 J/gK, and liquid phase is identified as 1.551 J/g-K, the enthalpy during the phase change process is found as 116.72 J/g. As well, the thermal conductivity of the solar salt is measured in Transient Heat Conduction method, and the thermal conductivity follows the linear relationship of -0.0025(T)+0.4023 (45ºC

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开发和研究用于太阳能工艺加热应用的硝酸盐相变填充材料

Thermocline 热能储存系统是一种用于太阳能工艺加热应用的御用系统。热能储存系统由填充材料和导热液体组成。在本研究中，合成了商用相变材料（PCM）（填充材料）太阳盐（60%NaNO3+40%KNO3），并将其封装在厚度为 1 毫米、宏观尺寸为 60 毫米的不锈钢 316L 封装层中；封装的 PCM 被视为 Thermocline 储热系统中的单一颗粒。在充注过程中，导热流体（Therminol-VP1）的恒定流速为 0.00015 kg/s，研究了单个封装 PCM 的性能。在差示扫描量热仪（DSC）上测量的太阳能盐的固相比热为 1.381 J/g-K，液相比热为 1.551 J/g-K，相变过程中的热焓为 116.72 J/g。此外，用瞬态热传导法测量了太阳盐的导热系数，在显热区，导热系数遵循-0.0025(T)+0.4023（45ºC

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