Study on Thermophysical Properties of Nanofluid Based Composite Phase Change Material for Low Temperature Application
| Autor: | Munyalo Jotham Muthoka, Zhang Xuelai, Xu Xioafeng |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
020209 energy Enthalpy of fusion Barium chloride 02 engineering and technology Carbon nanotube 021001 nanoscience & nanotechnology law.invention chemistry.chemical_compound Thermal conductivity Nanofluid chemistry Chemical engineering law Heat transfer 0202 electrical engineering electronic engineering information engineering 0210 nano-technology Supercooling Mass fraction |
| Zdroj: | Energy Procedia. 142:3313-3319 |
| ISSN: | 1876-6102 |
| Popis: | Phase change materials continue to attract attention of researchers worldwide as a new way of conserving thermal energy. However, most of these materials undergo super cooling and have low thermal conductivity that inhibits effective heat transfer. In this paper super cooling, thermal conductivity and latent heat of fusion of water based nanofluid of barium chloride dehydrate (BaCl 2 .2H 2 O) were experimentally studied by adding a mass fraction of 0.2wt%~ 1wt% magnesium oxide (MgO) and 0.2wt%~ 1wt% multi-walled carbon nanotubes (MWCNTs). The results show that by separately adding a mass fraction of 1% of MgO and MWCNTs reduce the supercooling degree of barium chloride dihydate by 85% and 92% respectively. At the same mass fraction concentration, thermal conductivity also improves by 6% on addition of MWCNTs and 17% on addition of MgO. However, the enthalpies reduce by 7% at 1wt% MgO and by 12.3% at 1wt% MWCNTs. It was found that MgO exhibited relatively higher thermal conductivity and a lower reduction in latent heats at a mass fraction of 1%. |
| Databáze: | OpenAIRE |
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