Performance evaluation of underground thermal storage integrated dual-source heat pump systems

Shi, Liang; Qu, Ming; Liu, Xiaobing; Pablo Venegas, Tomas; Wang, Lingshi; Dong, Jin; Cui, Borui; Xu, Haowen; Liu, Xiaoli; Li, Yanfei

doi:10.1016/j.enbuild.2024.114349

Performance evaluation of underground thermal storage integrated dual-source heat pump systems

Journal Article · Sat Jun 01 00:00:00 EDT 2024 · Energy and Buildings

DOI:https://doi.org/10.1016/j.enbuild.2024.114349· OSTI ID:2376312

Shi, Liang ^[1]; ^[1]; ^[2]; Pablo Venegas, Tomas ^[1]; ^[2]; ^[2]; ^[2]; ^[2]; Liu, Xiaoli ^[2]; ^[2]

Purdue Univ., West Lafayette, IN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The increasing demand for electricity stresses the existing electric grids. Buildings consume 73% of all U.S. electricity and are responsible for 30% of U.S. greenhouse gas emissions. Integrating thermal energy storage (TES) in building heating/cooling systems, which consume considerable electricity, can mitigate the challenges to electric grids. Here, this study reports on a novel thermal energy storage device integrated heat pump system to reshape the building electricity demand profile while maintaining thermal comfort. The annual performance of the proposed system has been evaluated through a dynamic system simulation with high fidelity in the Modelica platform. The dynamic model of the novel hybrid component named ‘dual purpose underground thermal battery’ was developed and validated. It was then incorporated into the system model. Given a time-of-use tariff, a rule-based control strategy was designed to shift the electric demand and switch the heat pump source for a typical single-family house in different climate zones of the United States. The system performance of the new TES-integrated dual-source heat pump was compared with that of a conventional air-source heat pump system. The results indicate that the proposed system can reduce the annual HVAC electricity cost by up to 52% while saving 45.2% on electricity consumption. In the Northern areas, the annual peak load of the HVAC system can be reduced by 64.9%. However, this reduction is less in the Southern areas as the system’s higher efficiency in winter dominates the overall energy-saving potential.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2376312

Journal Information:: Energy and Buildings, Journal Name: Energy and Buildings Vol. 316; ISSN 0378-7788

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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