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2021 Thermal Energy Storage Systems

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2021 Thermal Energy Storage Systems ( 2021-thermal-energy-storage-systems )

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Thermal Energy Storage Systems for Buildings Workshop Report • Providing zoned HVAC/TES solutions to a confined room or area of a building may be a lower-cost solution to bring some degree of comfort to low-income populations. System Performance • Full control is needed over when/how TES charges and discharges. • Heat pump performance can vary with ambient conditions. With proper controls, TES can provide efficiency improvements if heat pump lifts are high during peak demand periods. • Material improvements and heat transfer enhancements may be required to provide high power delivery. Heat transfer into and out of the TES material is critical, which is typically a more expensive part of the TES system than the material alone. • Building thermal end uses can utilize heat over a wide range of temperatures. As many TES systems are designed to deliver heat at a specific temperature range, it will be important to understand the temperature levels needed for a particular application. • The lifetime and degree of performance degradation of thermal energy storage materials can vary. Understanding how long and how frequently a storage asset can be utilized will be important for assessing the economics of a TES system. • Quantify the degree to which the storage asset can support grid stability and resilience. • Understanding the risk and hazards to property and personnel should the storage system undergo unexpected failure. • Being able to predict availability for optimized control is important, including real-time measurement and control, as well as model predictive control to minimize economic cost. Market Requirements • Need to better understand what type of rate structure and billing rate would make the system beneficial. • Need to better understand how TES will help avoid expanding generation capacity and transmission and distribution networks. • We need to take life cycle analysis tools from research to application. Modeling of these systems is difficult and can help support economic incentives beyond demand reduction. • Ideally, TES would not require sacrifices for other parts of the building design. For example, if adding TES makes the engineer’s job more difficult or risky, or it means there is more work to coordinate with other aspects of the building design, it will make them less likely to design TES for that building. 21

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