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Grid-interactive efficient buildings using thermal energy storage for electric heat pumps.

Number: 3348

Author(s) : AGRAWALA P., GOYAL A.

Summary

Electric heat pumps are a promising solution to decarbonize building heating by using renewable power and replacing existing fossil fuel based heating technologies. However, with the large-scale deployment of heat pumps, it is important to develop energy storage solutions to store renewable electricity and dispatch it when the generation is low, but the demand is high. This paper presents a system-level simulation of an air-to-water heat pump integrated with thermal energy storage for building heating. We coupled a validated quasi-steady thermodynamic model of the heat pump and a reduced-order transient model of a phase-change thermal storage module. We calculate the round-trip efficiency of the TES-integrated heat pump operating in the peak shaving mode using different TES materials for a representative commercial building. The performance of the proposed system showed a 26.67% reduction in the peak heating load in cold climates and the total electrical energy consumption for design day heating reduced by 4.8-11.5%. Our analyses show that a TES temperature close to the supply air conditions leads to a higher round-trip efficiency. Therefore, selecting a TES material based on its energy density (kJ/kg or kJ/m3), phase-change temperature, and cost is crucial to successfully implementing these systems. The configuration of TES-integrated heat pumps and the heat transfer design of the TES module will be essential to reduce the peak heating energy demand and emissions and help buildings interact with the future electricity grid with a high fraction of renewable power.

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Pages: 9 p.

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  • Original title: Grid-interactive efficient buildings using thermal energy storage for electric heat pumps.
  • Record ID : 30032940
  • Languages: English
  • Source: 2024 Purdue Conferences. 8th International High Performance Buildings Conference at Purdue.
  • Publication date: 2024/07/15

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