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Experiments on thermal performance of erythritolexpanded graphite in a direct contact thermal energy storage container.pdf

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Experiments on thermal performance of erythritolexpanded graphite in a direct contact thermal energy storage container.pdf

Applied Thermal Engineering 113 (2017) 858–866 Contents lists available at ScienceDirect Applied Thermal Engineering journal homepage: /locate/apthermeng Research Paper Experiments on thermal performance of erythritol/expanded graphite in a direct contact thermal energy storage container Liuhua Gao, Jun Zhao, Qingsong An ?, Dong Zhao, Feng Meng, Xueling Liu Key Laboratory of Ef?cient Utilization of Low and Medium Grade Energy, MOE, Tianjin University, Tianjin 300350, PR China highlights Test thermal characteristic of PCMs without/with EG. Experiment on thermal performance of PCMs in a direct contact TES container. Effectiveness of adding EG was analyzed. Effectiveness of quick channels on melting process of composite PCMs was drawn. article info Article history: Received 11 August 2016 Revised 7 November 2016 Accepted 8 November 2016 Available online 11 November 2016 Keywords: Latent heat thermal energy storage Phase change material Expanded graphite Direct contact Heat transfer enhancement abstract To enhance heat transfer of erythritol in a direct contact thermal energy storage (TES) container, expanded graphite (EG) was used as additives. Composite PCMs with 1 wt%, 2 wt%, 3 wt% and 4 wt% EG were prepared using melt-blending method; the thermal characteristic and thermal response of the materials was tested; and the thermal performance in a direct contact container was measured by thermal charging and discharging experiment. The thermal characteristic test showed that with the increase of EG content, the thermal conductivity of the composite PCMs increased while the latent heat slightly decreased. For the composite PCM with 4 wt% EG, the thermal conductivity was increased by about 2.5 times and the latent heat was only decreased by 2.59% compared with that of the pure erythritol. However, considering the melting time in thermal response tests, the composite PCM with 3 wt% EG, of which the thermal conductivity was increased by about 1.8 times was chosen for