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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

PHASE CHANGE BEHAVIOR OF CARBON BASED NANOCOMPOSITES IN HORIZONTAL SHELL-TUBE LATENT HEAT THERMAL ENERGY STORAGE SYSTEMS

Nitesh Das
School of Engineering, Indian Institute of Technology, Mandi, Himachal Pradesh, Kamand, 175-005, India

Yasuyuki Takata
Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan; International Institute for Carbon-Neutral Energy Research (WPI - I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Masamichi Kohno
Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan; International Institute for Carbon-Neutral Energy Research (WPI - I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Sivasankaran Harish
International Institute for Carbon-Neutral Energy Research (WPI - I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Abstract

In the present work, we numerically investigate the melting phenomena of carbon based nanocomposites in horizontally oriented shell-tube latent heat thermal energy storage system. Organic alkane n-eicosane was considered as the phase change material and carbon allotropes as the nano fillers to enhance the thermal conductivity of n-alkane. The effect of different carbon allotropes like nanodiamond (spherical), single-walled carbon nanotubes (one-dimensional) and graphene nanosheets (two-dimensional) were considered. Thermal conductivity of nanocomposites was modeled using effective medium based formulation considering the interfacial thermal boundary resistance between nanomaterial and the surrounding host matrix into account. Numerical results show that spherical nano inclusions do not enhance the melting rate due to limited enhancement in the thermal conductivity of nanocomposites. However, the inclusion of one-dimensional and two-dimensional nanostructures enhances the thermal conductivity of n-eicosane significantly which results in the improvement of melting rate. At 1 vol % loading of single-walled carbon nanotubes and graphene nanosheets the melting time decreases by ~ 27 % and ~ 40 % respectively.

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