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Thermal Energy Storage Systems for Buildings Workshop Report events. The study investigated both heat pump water heaters and electric resistance water heaters. Most of the study participants claim that they would partake in a similar demand response program in the future. Grid-enabled water heaters provide several value propositions for utilities, manufacturers, aggregators, and others. Barriers Wickes identified include increased capital costs, privacy security, and lack of awareness. • Tom Vega, of the Baltimore Aircoil Company, discussed his experiences with ice storage equipment. Vega explained the differences between major ice storage equipment types and where they are typically installed. Most buildings that utilize ice storage typically have eight or more hours of reduced cooling load at night to allow the system to recharge. Common motivators for the adoption of ice storage technologies include the presence of variable utility rates, incentive rewards, boosting resilience, and downsizing equipment. Vega identified several challenges to deploying ice storage, including lack of space and familiarity with systems, flat utility rates, and complex incentive requirements with uncertain durations. • Dr. Wim van Helden, of the AEE Institute for Sustainable Technologies, provided examples and status updates on compact TES systems. Van Helden described thermochemical materials that were utilized for near or no-loss long-term storage. AEE demonstrated a salt hydrate-based storage system in a home. Over the course of their study, AEE reported that they successfully provided heating with essentially no degradations in the storage materials. Van Helden then discussed some of the international collaborations taking place in the International Energy Agency on PCM and thermochemical material storage. He concluded his presentation discussing the future of compact TES including the driving influence of electrification and the need for long-term R&D. Novel Systems and Approaches The final panel of the workshop was moderated by BTO’s Erika Gupta. This panel was structured to discuss the next generation of TES technologies. Gupta introduced the panelists and moderated discussion with the audience. • Dr. Jason Woods, of NREL, introduced NREL’s multiscale thermal storage research consisting of modeling, design, and experimentation in materials, components, systems, and building grid integration. Woods then discussed opportunities for optimizing hybrid battery and thermal storage systems. He explained how hybrid systems could provide cost-optimal solutions through minimizing battery cycles and extending system lifetime. • Dr. Som Shrestha, of ORNL, introduced an integrated thermally anisotropic building envelope concept. The benefits of the proposed technology include the redirection of heat in lieu of increased insulation, the potential to harvest thermal energy, and the ability to reduce HVAC loads providing demand reduction. Shrestha also presented results from field validations demonstrating the technology’s abilities to redirect thermal loads. • Dr. Sumanjeet Kaur, of LBNL, discussed her work on dynamic and tunable thermal storage. Distributing thermal storage in the building envelope takes advantage of the large surface area and volume of the envelope. By developing dynamic methods to 13PDF Image | 2021 Thermal Energy Storage Systems
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