Abstract
The worldwide increasing energy demand and 2050 net zero carbon target urge the globe to solve the energy challenge. Thermal Energy Storage (TES) has received significant attention in recent years as TES can be integrated into heating, ventilation, and air-conditioning systems where the energy would be stored during low-demand times and dispatched during high-demand times, resulting in controlling the peak load and improving energy savings. Material development is an integral part of TES. Salt hydrates are appealing due to cost-effectiveness, low- to no toxicity, and their high melting enthalpy, where energy is stored as latent heat. However, most salt hydrates are prone to incongruent melting (i.e., phase separation upon melting), which results in poor stability and large supercooling. In this study, we produced a highly stable novel energy storage material at a composition of 32 wt% sodium sulfate decahydrate, 52 wt% sodium phosphate dibasic dodecahydrate, 12 wt% milled expanded graphite, and 4 wt% borax. The material has a melting temperature of 28°C and an energy storage capacity of 167 kJ/kg with a supercooling of less than 3°C. The system showed no loss in energy storage performance after 150 cycles. The findings suggest that the novel energy storage material developed in this might be utilized in building heating and cooling applications.
| Original language | English |
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| Title of host publication | Proceedings of ASME 2023 17th International Conference on Energy Sustainability, ES 2023 |
| Publisher | American Society of Mechanical Engineers |
| ISBN (Electronic) | 9780791887189 |
| DOIs | |
| State | Published - 2023 |
| Event | ASME 2023 17th International Conference on Energy Sustainability, ES 2023 - Washington, United States Duration: Jul 10 2023 → Jul 12 2023 |
Publication series
| Name | Proceedings of ASME 2023 17th International Conference on Energy Sustainability, ES 2023 |
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Conference
| Conference | ASME 2023 17th International Conference on Energy Sustainability, ES 2023 |
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| Country/Territory | United States |
| City | Washington |
| Period | 07/10/23 → 07/12/23 |
Funding
This work was sponsored by the U.S. Department of Energy’s (DOE) Building Technologies Office under Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC. The authors would like to acknowledge Mr. Sven Mumme, Technology Manager, from the U.S. Department of Energy Building Technologies Office. The experimental investigations were performed at the Building Technologies Research and Integration Center (BTRIC) at the Oak Ridge National Laboratory. Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). This work was sponsored by the U.S. Department of Energy’s (DOE) Building Technologies Office under Contract No. DEAC05-00OR22725 with UT-Battelle, LLC. The authors would like to acknowledge Mr. Sven Mumme, Technology Manager, from the U.S. Department of Energy Building Technologies Office. The experimental investigations were performed at the Building Technologies Research and Integration Center (BTRIC) at the Oak Ridge National Laboratory.
Keywords
- building energy storage
- phase change materials
- thermal energy storage