Effect of carbon nanomaterial on latent heat storage performance of carbonate salts in horizontal concentric tube

Abstract During the preparation of nanocomposite phase change material (nanoCPCM), more attentions are focused on thermal conductivity. In fact, adding nanomaterial not only affects thermal conductivity, but also changes the other thermophysical properties of PCM and causes complicated effects on latent heat storage performance. In present study, melting behavior of pure phase change material and its four kinds of nanocomposites in a horizontal concentric tube were investigated and a new evaluation index was developed to examine the effects of nanomaterial on heat storage performance of nanoCPCM. The results show that both thermal conductivity and melting temperature have significant effects on nanoCPCM melting behavior and heat storage rate. Sometimes, although the thermal conductivity is enhanced, the heat storage rate is decreased due to its melting temperature increasing caused by nanomaterial. Especially, when the heat source temperature and PCM melting temperature is close, the variation of melting temperature is more significant. For example, nanoCPCM with SWCNT has the higher thermal conductivity, but its heat storage rate is slower than nanoCPCM with MWCNT, because of its higher melting temperature. Therefore, more attention must be paid to the variation of melting temperature caused by nanomaterial during the preparation and application of nanoCPCMs.

[1]  A. Sari,et al.  Micro/nano encapsulation of some paraffin eutectic mixtures with poly(methyl methacrylate) shell: Preparation, characterization and latent heat thermal energy storage properties , 2014 .

[2]  F. Duan,et al.  Three-dimensional transient numerical study on latent heat thermal storage for waste heat recovery from a low temperature gas flow , 2017 .

[3]  Ruzhu Wang,et al.  Enhancement of heat transfer for thermal energy storage application using stearic acid nanocomposite with multi-walled carbon nanotubes , 2013 .

[4]  Ya-Ling He,et al.  A review of phase change material and performance enhancement method for latent heat storage system , 2018, Renewable and Sustainable Energy Reviews.

[5]  Changying Zhao,et al.  Thermodynamic analysis and optimization of cascaded latent heat storage system for energy efficient utilization , 2015 .

[6]  Yang Liu,et al.  Thermodynamic analysis and optimization of multistage latent heat storage unit under unsteady inlet temperature based on entransy theory , 2017, Applied Energy.

[7]  T. Teng,et al.  Performance assessment of heat storage by phase change materials containing MWCNTs and graphite , 2013 .

[8]  Huaqing Xie,et al.  Enhancing thermal conductivity of palmitic acid based phase change materials with carbon nanotubes as fillers , 2010 .

[9]  V. Carey,et al.  Effects of PCM thermophysical properties on thermal storage performance of a shell-and-tube latent heat storage unit , 2016 .

[10]  M. Lacroix.  Numerical simulation of a shell-and-tube latent heat thermal energy storage unit , 1993 .

[11]  A. Mujumdar,et al.  Finite-element analysis of cyclic heat transfer in a shell-and-tube latent heat energy storage exchanger , 1997 .

[12]  Ya-Ling He,et al.  Preparation and thermal properties characterization of carbonate salt/carbon nanomaterial composite phase change material , 2015 .

[13]  S. Harish,et al.  Effect of carbon nano inclusion dimensionality on the melting of phase change nanocomposites in vertical shell-tube thermal energy storage unit , 2017 .

[14]  Zhishen Wu,et al.  Carbon nanotube grafted with polyalcohol and its influence on the thermal conductivity of phase change material , 2014 .

[15]  Ya-Ling He,et al.  Evaluation and optimization of melting performance for a latent heat thermal energy storage unit partially filled with porous media , 2017 .

[16]  Ya-Ling He,et al.  Effect of surface active agent on thermal properties of carbonate salt/carbon nanomaterial composite phase change material , 2015 .

[17]  D. Patil,et al.  Enhanced melting behavior of carbon based phase change nanocomposites in horizontally oriented latent heat thermal energy storage system , 2017 .

[18]  R. Hirmiz,et al.  Performance enhancement of solar absorption cooling systems using thermal energy storage with phase change materials , 2018, Applied Energy.

[19]  Pengtao Wang,et al.  Effects of thermal conductivity and density on phase change materials-based thermal energy storage systems , 2019, Energy.

[20]  Ruzhu Wang,et al.  Heat transfer characteristics of phase change nanocomposite materials for thermal energy storage application , 2014 .

[21]  Hamid Ait Adine,et al.  Numerical analysis of the thermal behaviour of a shell-and-tube heat storage unit using phase change materials , 2009 .

[22]  Zhonghao Rao,et al.  Lattice Boltzmann investigation on phase change of nanoparticle-enhanced phase change material in a cavity with separate plate , 2017 .

[23]  Y. Tao,et al.  Lattice Boltzmann simulation on phase change heat transfer in metal foams/paraffin composite phase change material , 2016 .

[24]  Jesús Lizana,et al.  Energy flexible building through smart demand-side management and latent heat storage , 2018, Applied Energy.

[25]  Peijun Ji,et al.  Improvement of the thermal conductivity of a phase change material by the functionalized carbon nanotubes , 2012 .

[26]  Ya-Ling He,et al.  Effects of natural convection on latent heat storage performance of salt in a horizontal concentric tube , 2015 .

[27]  Zhengguo Zhang,et al.  Compact liquid cooling strategy with phase change materials for Li-ion batteries optimized using response surface methodology , 2018, Applied Energy.