期刊
APPLIED THERMAL ENGINEERING
卷 160, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.114024
关键词
Thermal energy storage; Phase change material; Heat transfer; Nanofluids; Microchannel
资金
- National Natural Science Foundation of China [51776218]
- Natural Science Foundation of Jiangsu Province [BK20180083]
In order to enhance the heat transfer performance of phase change material (PCM) for thermal energy storage (TES) in tiny devices, such as battery thermal management, light-emitting diode and electronic device cooling, TiO2-H2O nanofluids and the microchannel were combined in this paper. Two crystal forms of TiO2-H2O nanofluids were prepared by using a two-step method. And paraffin was used as PCM. The stability and thermophysical properties of the above two nanofluids were tested and compared. It can be found that R TiO2-H2O nanofluid has better stability, and its thermal conductivity increases maximally by 3.27%, while the value is 2.88% of A TiO2-H2O. Besides, R TiO2-H2O nanofluid increases the viscosity by a maximum of 4.87%, while A TiO2-H2O increases by 7.45%. Considering these properties, R TiO2-H2O nanofluid was chosen to study the heat transfer characteristics in the microchannel within a TES unit. The results indicate that R TiO2-H2O nanofluid with 1.0 wt% increases Nu by 19 similar to 41% and 6 similar to 14% during the melting process and solidification process respectively. In addition, the melting time of paraffin decreases by a maximum of 32.90% and the solidifying time of paraffin decreases by a maximum of 22.57%. During the whole TES process, there is an increase in pressure drop of no more than 8%.
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