Demonstration of Mg(NO3)2·6H2O-based composite phase change material for practical-scale medium-low temperature thermal energy storage
| Autor: | B.C. Zhao, J.C. Gao, R.Z. Wang, F. He, Tingxian Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Thermal efficiency
Materials science 020209 energy Composite number 02 engineering and technology Thermal energy storage Industrial and Manufacturing Engineering chemistry.chemical_compound 020401 chemical engineering Thermal insulation Latent heat Thermal 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Electrical and Electronic Engineering Composite material Civil and Structural Engineering business.industry Mechanical Engineering Building and Construction Pollution Magnesium nitrate General Energy chemistry Heat fusion business |
| Zdroj: | Energy. 201:117711 |
| ISSN: | 0360-5442 |
| DOI: | 10.1016/j.energy.2020.117711 |
| Popis: | This work focuses on the industrialization-oriented investigation of a latent heat storage using a magnesium nitrate hydrate-based composite phase change material. Three aspects of studies are included: (i) characterizations on the thermal-physical properties of the composite, (ii) explorations on the supercooling stability of the composite within continuous thermal cycles, and (iii) evaluations on the thermal performance of a pilot-scale storage unit. The results indicate that the freshly-prepared composite has a fusion heat of 147.9 ± 0.5 J g−1, a storage capacity of 253.5 ± 0.9 J g−1 within 70–110 °C. The PCM presents no significant degradation after 100 thermal cycles. The material performs a better supercooling stability than pure magnesium nitrate hexahydrate. The designed latent heat storage unit can achieve stable charges and discharges with an effective heat storage density of 33.5 ± 2.6 kWh m−3, a thermal efficiency of 88.1 ± 9.6% and a thermal loss of around 10% during a daily operation. In addition, the storage unit performs a higher latent heat release concentration as discharging rate drops and its effective storage capacity within 80–85 °C is over 4.3 times of water storage. The density of the device within a daily operation can be effectively improved by reducing the thickness of thermal insulation layer. |
| Databáze: | OpenAIRE |
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