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2 results on '"Jianlei Niu"'

1. Constructal design of latent thermal energy storage with vertical spiral heaters

Author

Jianlei Niu, Adrian Bejan, Sylvie Lorente, Laboratoire Matériaux et Durabilité des constructions (LMDC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Department of Mechanical Engineering and Materials Science, Department of Mechanical Engineering, The Hong Kong Polytechnic University [Hong Kong] (POLYU), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)

Subjects
Fluid Flow and Transfer Processes, Materials science, Constructal law, Energy storage, Mechanical Engineering, tube, unit, phase-change materials, Mechanics, Melting, Constructal, Condensed Matter Physics, Thermal energy storage, Phase-change material, Physics::Fluid Dynamics, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, Fluid dynamics, Cylinder, systems, Coaxial, Spiral, convection, Phase change material
Abstract

WOS:000346951400031; International audience; This paper reports a numerical and analytical study of time dependent storage of energy by melting a phase change material in a cylindrical tank. In the first part of the study the heater was a vertical spiral tube positioned coaxially with the tank. In the second part, the heater consisted of two coaxial spirals positioned on the same axis as the cylinder. In accord with the philosophy of constructal design, the heat and fluid flow configuration was endowed with degrees of freedom in order to morph toward better overall performance for a fixed amount of heating material. The paper documents the effect of the geometrical features such as helix diameter and pitch on the overall performance. (C) 2014 Elsevier Ltd. All rights reserved.

Published
2015
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2. Phase change heat storage in an enclosure with vertical pipe in the center

Author

Adrian Bejan, Jianlei Niu, Sylvie Lorente, Laboratoire Matériaux et Durabilité des constructions (LMDC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Department of Mechanical Engineering and Materials Science, Department of Mechanical Engineering, The Hong Kong Polytechnic University [Hong Kong] (POLYU), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)

Subjects
Materials science, Energy storage, 020209 energy, unit, tube, Enclosure, Thermodynamics, 02 engineering and technology, system, Thermal energy storage, Scale analysis (statistics), Phase change, 0202 electrical engineering, electronic engineering, information engineering, convection, Fluid Flow and Transfer Processes, Natural convection, Mechanical Engineering, Process (computing), Mechanics, Melting, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Phase-change material, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, Scale analysis, thermal-energy storage, acid, 0210 nano-technology, performance, Phase change material
Abstract

WOS:000334481500029; International audience; This paper documents the fundamentals of heat storage by melting a phase-change material inside a cylindrical enclosure with a vertical heated pipe on its axis. The phenomenon is studied analytically and numerically. The analysis consists of the scale analysis of the early stages of natural convection in the liquid, and an analysis of the entire duration of the melting process. The numerical simulations cover the entire process, and validate all the features predicted by theory. (C) 2014 Elsevier Ltd. All rights reserved.

Published
2014
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