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Experimental investigation on space heating performances of supercooled thermal storage units with sodium acetate trihydrate
Highlights Space heating performances of two modes using supercooled storage units are tested. Both capillary-mat radiant floor heating and direct discharging mode meet heat demand. Capillary-mat radiant floor heating mode presents less temperature swing and gradient. Direct discharging mode has higher initial heating rate but larger temperature swing. Capillary-mat radiant floor heating has better indoor comfort than direct discharging.
Abstract Supercooled salt hydrates could be applied for long-term solar thermal storage and then be activated to release the stored latent heat on demand. To realize this strategy, the space heating performances with supercooled storage units need to be clarified. Experiments were performed on two heating modes using thermal storage units filled with supercooled liquid sodium acetate trihydrate (SAT), i.e. the capillary-mat floor water heating and direct heat release to the room air, respectively. The results show that, with the terminal of capillary-mat radiant floor, the maximum supply water temperature reaches 35 °C within 0.3 h and the room temperature increases from initial 20.3 °C to the maximum 25.8 °C within 2.8 h. The room temperature could be kept above 24.8 °C after the system runs for 12 h. Also, the temperature difference between the 0.5 m and 1.5 m height levels in the room space is within 0.2 °C. While the thermal storage units directly release heat to the room air with the same mass of SAT, the room temperature could rise up to 27.2 °C within 1.1 h which is higher than that of the capillary-mat terminal even in shorter period. However, the room temperature drops quickly and is about 20.9 °C after 12 h, and the maximum temperature difference between the heights of 0.5 m and 1.5 m in the room is 2.4 °C. Although the combination of supercooled liquid SAT and the capillary-mat radiant floor terminal has delayed heating rate into the room space, it presents less temperature swing and lower vertical temperature gradient, thus not only meets the room temperature requirement, but also has better thermal comfort. The results provide guidance for application of supercooled liquid PCMs for solar thermal storage in space heating systems.
Experimental investigation on space heating performances of supercooled thermal storage units with sodium acetate trihydrate
Highlights Space heating performances of two modes using supercooled storage units are tested. Both capillary-mat radiant floor heating and direct discharging mode meet heat demand. Capillary-mat radiant floor heating mode presents less temperature swing and gradient. Direct discharging mode has higher initial heating rate but larger temperature swing. Capillary-mat radiant floor heating has better indoor comfort than direct discharging.
Abstract Supercooled salt hydrates could be applied for long-term solar thermal storage and then be activated to release the stored latent heat on demand. To realize this strategy, the space heating performances with supercooled storage units need to be clarified. Experiments were performed on two heating modes using thermal storage units filled with supercooled liquid sodium acetate trihydrate (SAT), i.e. the capillary-mat floor water heating and direct heat release to the room air, respectively. The results show that, with the terminal of capillary-mat radiant floor, the maximum supply water temperature reaches 35 °C within 0.3 h and the room temperature increases from initial 20.3 °C to the maximum 25.8 °C within 2.8 h. The room temperature could be kept above 24.8 °C after the system runs for 12 h. Also, the temperature difference between the 0.5 m and 1.5 m height levels in the room space is within 0.2 °C. While the thermal storage units directly release heat to the room air with the same mass of SAT, the room temperature could rise up to 27.2 °C within 1.1 h which is higher than that of the capillary-mat terminal even in shorter period. However, the room temperature drops quickly and is about 20.9 °C after 12 h, and the maximum temperature difference between the heights of 0.5 m and 1.5 m in the room is 2.4 °C. Although the combination of supercooled liquid SAT and the capillary-mat radiant floor terminal has delayed heating rate into the room space, it presents less temperature swing and lower vertical temperature gradient, thus not only meets the room temperature requirement, but also has better thermal comfort. The results provide guidance for application of supercooled liquid PCMs for solar thermal storage in space heating systems.
Experimental investigation on space heating performances of supercooled thermal storage units with sodium acetate trihydrate
Zhou, Guobing (author) / Li, Yun (author) / Zhu, Maochuan (author)
Energy and Buildings ; 271
2022-07-20
Article (Journal)
Electronic Resource
English
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| British Library Online Contents | 2017