skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on January 5, 2021

Title: A novel shallow bore ground heat exchanger for ground source heat pump applications—Model development and validation

Abstract

A novel ground heat exchanger design, the Underground Thermal Battery (UTB), was proposed as a low-cost alternative to the conventional vertical bore ground heat exchanger (VBGHE) for the application of ground source heat pumps (GSHPs). The UTB is designed to be installed in a shallow borehole (less than 6 m deep) and thus could cost much less than the conventional VBGHE, which usually is installed in vertical bores 60 m deep. By utilizing natural convection of water and phase change materials, the UTB tempers its temperature change in response to thermal loads, which helps improve the efficiency of GSHPs. A one-dimensional (1D) model of the UTB has been developed and validated with the measured performance data of a small-scale UTB, as well as the simulation results of a more detailed three dimensional (3D) numerical model, which accounts for both heat transfer and fluid dynamics in the UTB. Further, this 1D model is computationally much more efficient than the 3D model and thus can simulate the annual performance of the UTB with acceptable computation time. The 1D model has been used to evaluate the performance of the UTB so that it can be compared with the conventional VBGHE.

Authors:
 [1]; ORCiD logo [2];  [3];  [3]; ORCiD logo [2]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1570123
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Applied Thermal Engineering
Additional Journal Information:
Journal Volume: 164; Journal Issue: C; Journal ID: ISSN 1359-4311
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Ground source heat pump; Ground heat exchanger; Numerical modeling; Validation

Citation Formats

Warner, Joseph, Liu, Xiaobing, Shi, Liang, Qu, Ming, and Zhang, Mingkan. A novel shallow bore ground heat exchanger for ground source heat pump applications—Model development and validation. United States: N. p., 2020. Web. doi:10.1016/j.applthermaleng.2019.114460.
Warner, Joseph, Liu, Xiaobing, Shi, Liang, Qu, Ming, & Zhang, Mingkan. A novel shallow bore ground heat exchanger for ground source heat pump applications—Model development and validation. United States. doi:10.1016/j.applthermaleng.2019.114460.
Warner, Joseph, Liu, Xiaobing, Shi, Liang, Qu, Ming, and Zhang, Mingkan. Sun . "A novel shallow bore ground heat exchanger for ground source heat pump applications—Model development and validation". United States. doi:10.1016/j.applthermaleng.2019.114460.
@article{osti_1570123,
title = {A novel shallow bore ground heat exchanger for ground source heat pump applications—Model development and validation},
author = {Warner, Joseph and Liu, Xiaobing and Shi, Liang and Qu, Ming and Zhang, Mingkan},
abstractNote = {A novel ground heat exchanger design, the Underground Thermal Battery (UTB), was proposed as a low-cost alternative to the conventional vertical bore ground heat exchanger (VBGHE) for the application of ground source heat pumps (GSHPs). The UTB is designed to be installed in a shallow borehole (less than 6 m deep) and thus could cost much less than the conventional VBGHE, which usually is installed in vertical bores 60 m deep. By utilizing natural convection of water and phase change materials, the UTB tempers its temperature change in response to thermal loads, which helps improve the efficiency of GSHPs. A one-dimensional (1D) model of the UTB has been developed and validated with the measured performance data of a small-scale UTB, as well as the simulation results of a more detailed three dimensional (3D) numerical model, which accounts for both heat transfer and fluid dynamics in the UTB. Further, this 1D model is computationally much more efficient than the 3D model and thus can simulate the annual performance of the UTB with acceptable computation time. The 1D model has been used to evaluate the performance of the UTB so that it can be compared with the conventional VBGHE.},
doi = {10.1016/j.applthermaleng.2019.114460},
journal = {Applied Thermal Engineering},
number = C,
volume = 164,
place = {United States},
year = {2020},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on January 5, 2021
Publisher's Version of Record

Save / Share: