A Three-Dimensional Numerical Investigation of a Novel Shallow Bore Ground Heat Exchanger Integrated with Phase Change Material

Zhang, Mingkan; Liu, Xiaobing; Biswas, Kaushik; Warner, Joseph

doi:10.1016/j.applthermaleng.2019.114297

A Three-Dimensional Numerical Investigation of a Novel Shallow Bore Ground Heat Exchanger Integrated with Phase Change Material

Journal Article · Sat Aug 24 00:00:00 EDT 2019 · Applied Thermal Engineering

DOI:https://doi.org/10.1016/j.applthermaleng.2019.114297· OSTI ID:1559656

^[1]; ^[1]; ^[1]; Warner, Joseph ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)

The heat transfer performance of an innovative design of ground heat exchanger, called underground thermal battery (UTB), was investigated in this paper. The UTB is designed to be installed in a shallow subsurface of the ground (less than 20 ft or 6 m below the grade), which is much shallower than the vertical bores (deeper than 200 ft or 60 m) required for installing conventional vertical bore ground heat exchangers (VBGHE). The UTB consists of a water-filled tank that also contains a phase change material (PCM), which impart the UTB a large thermal storage capacity. A three-dimensional (3D) numerical model has been developed to evaluate the performance of the UTB and to compare it with a conventional VBGHE. The simulation results indicated that a UTB can better regulate the entering water temperature of a ground source heat pump (GSHP) for more efficient operation than a conventional VBGHE under short-term high thermal load conditions. In addition, the UTB can make more effective use of PCMs compared with using PCMs to replace the conventional grouting material in a VBGHE.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1559656

Alternate ID(s):: OSTI ID: 1560321

Journal Information:: Applied Thermal Engineering, Journal Name: Applied Thermal Engineering Journal Issue: TBD Vol. TBD

Publisher:: ELSEVIERCopyright Statement

Country of Publication:: United States

Language:: English

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