Abstract
Phase change heat storage material is a preferred material in solar building heating or off-peak electric-heat storage heating technology and is the research focus. A compact phase change thermal storage device has been designed and experimentally studied for improving heating system load in this work. A new type, magnesium nitrate hexahydrate-based phase change material has been studied to improve the cooling degree and crystallization difficulty. The focus of this study is on the heat charging and discharging characteristics of this new phase change material. The heat storage device has two groups of coils, the inner side which carries water and the outer side which is the phase change material. A testing system was built up to value the thermal cycling performance of the heat storage device. The measurement data include phase change material temperature field, water inlet and water outlet mean temperature, heat charging and heat discharging depth, and flow rates over the operating period. The results show the phase change material has a quick response with the operating temperature range of 20–99 °C. Its latent heat is 151.3 J/g at 91.8 °C. The heat storage density of this phase change material is about 420 MJ/m3. The thermal performance degradation is about 1.8% after 800 operation cycles. The phase change thermal storage device shows flexibility and a great potential to improve the capacity and economy of heating systems.
Highlights
Published: 1 November 2021Ecological environment and energy utilization are closely related to social health development [1,2], and more than ninety percent of the world energy budget is connected to heat conversion and storage [3]
The results show that the supercooling of the composites can be mophysical modification and cycle of magnesium nitrate hexahydrate (MNH) including at about 2 properties
Main thermal heat charging and heatindischarging performance, need to bethe further analyzed properties and supercooling of theIn modified as MNH90 were charand evaluated in practical stability application
Summary
Ecological environment and energy utilization are closely related to social health development [1,2], and more than ninety percent of the world energy budget is connected to heat conversion and storage [3]. MNH as the main material all basically proved thecomposites applicamodification and cycle performance evaluation of MNH including the modified bility of in medium and low temperature energy storage. Inofaddition, some imthe research thermal design evaluation actual scale storage portant results obtained in previous studies, such as the theoretical heat storage capacity equipment using this material is quite few. Some important results obtained and of materials, charging and heat discharging performance, need toof in supercooling previous studies, such as heat the theoretical heat storage capacity and supercooling bematerials, further analyzed and evaluated practical application. Main thermal heat charging and heatindischarging performance, need to bethe further analyzed properties and supercooling of theIn modified as MNH90 were charand evaluated in practical stability application. MNH90 inbuilding the field of medium and low temperature heat storage and building heating
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