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Experimental and Numerical Investigation of a Packed-bed Thermal Energy Storage Device Bei Yanga), Yan Wang, Fengwu Baib), Zhifeng Wang Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China China National Solar Thermal Energy Alliance, Key Laboratory of Solar Thermal Energy and Photovoltaic System of Chinese Academy of Sciences, Beijing Engineering Research Center of Solar Thermal Power， University of Chinese Academy of Sciences a)Corresponding author:yangbei0127@163.com b)baifw@mail.iee.ac.cn, Tel:+86-1062558289 Abstract. This paper presents a pilot-scale setup built to study a packed bed thermal energy storage device based on ceramic balls randomly poured into a cylindrical tank while using air as heat transfer fluid. Temperature distribution of ceramic balls throughout the packed bed is investigated both experimentally and numerically. Method of characteristic is adopted to improve the numerical computing efficiency, and mesh independence is verified to guarantee the accuracy of numerical solutions and the economy of computing time cost at the same time. Temperature in tests is as high as over 600 °C, and modeling prediction shows good agreements with experimental results under various testing conditions when heat loss is included and thermal properties of air are considered as temperature dependent. Keywords. Packed bed, Thermal Energy Storage, High temperature, Experimental, Numerical INTRODUCTION Thermal energy storage (TES) systems are normally useful for correcting the decoupling between the power required by users and that produced by solar thermal power plants[1].The form of sensible heat storage in packed- bed of solid material is especially suitable for the system whose heat transfer fluid (HTF) is air, and the cost of fabrication of tank as well as heat storage materials is significantly lower than other TES methods[2]. A wide body of publications[3,4,5] describe numerical models for sensible heat storage in packed-beds, whereas experimental investigations and validations are relatively lacking, especially in large scale and in high temperature. This paper presents a pilot-scale setup built to study a TES device using ceramic balls as TES material while air as HTF. Experiments under various working conditions have been carried out, and a one-dimensional two-phase transient model has been developed based on the actual testing device, which also has been experimentally validated through various tests. A PILOT-SCALE TES DEVICE AND EXPERIMENTAL SETUP A Pilot Packed-bed TES Device The packed-bed TES device is shown schematically in Fig.1, which consists of one cylindrical shell and two conical shells. The two conical shells are respectively arranged on the top and the bottom of the tank, used to be connected with the pipes and help to form a relatively uniform air flow. The tank has a circular cross section with a inner diameter of 0.7 m, and a total height of 4 m. The tank wall is made of a 100mm layer of refractory bricks, SolarPACES 2016 AIP Conf. Proc. 1850, 080027-1–080027-9; doi: 10.1063/1.4984448 Published by AIP Publishing. 978-0-7354-1522-5/$30.00 080027-1PDF Image | packed-bed thermal energy storage device
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