Experimental investigation on high energy-density and power-density hydrated salt-based thermal energy storage

Ruxue Du, Minqiang Wu, Siqi Wang, Si Wu, Ruzhu Wang and Tingxian Li

Applied Energy, 2022, vol. 325, issue C, No S0306261922011370

Abstract: Thermal energy storage based on phase change materials (PCMs) plays a key role in bridging the gap between energy supply and demand for renewable energy applications. Hydrated salt is one kind of the most promising PCMs due to high phase-change enthalpy, non-flammability and low cost. Herein, we design and fabricate a lab-scale high energy-density and power-density thermal energy storage (TES) device using hydrated salt-based phase change composite (PCC). The thermophysical properties of the hydrated salt-based PCC are characterized and the thermal performances of the PCC-based TES device are analyzed at different operating conditions during charging and discharging processes. The Differential Scanning Calorimeter (DSC) analysis shows that the PCC has high phase-change enthalpy of 184.5 kJ·kg−1 and suitable phase-change temperature of 50 ℃ for hot water heating. The experimental results show that the PCC-based TES device exhibits high specific energy storage density up to 88.4 kWh·m−3, approximately 2.6 times higher than the conventional water tank storage device. In discharging process, the PCC-based TES device exhibits high energy density (∼81.6 kWh·m−3), high efficiency (∼92.3 %), high power density (∼669.9 W·kg−1), and stable output hot water temperature (45 ∼ 47 ℃) at different water flow rates (0.42 ∼ 2.42 L·min−1) and inlet cold water temperatures (8 ∼ 25 ℃).

Keywords: Thermal energy storage; Phase change composites; Hydrated salt; Energy density; Power density; Hot water (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (2)

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DOI: 10.1016/j.apenergy.2022.119870

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