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A numerical study on utilizing horizontal flat-panel ground heat exchangers in ground-coupled heat pumps

Habibi, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.renene.2019.09.040
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. Horizontal ground heat exchangers (GHEs) have a lower cost in comparison to vertical ones; however, they require more land area. For the sake of reducing the required land area for horizontal GHEs, flat-panel GHEs have been recently introduced. In this piece of research, a 3-D numerical model has been developed to predict the thermal performance of flat-panel GHEs. In this study, at first, the thermal performance of a flat-panel GHE has been compared with that of linear horizontal ones. The results demonstrate that the flat-panel GHE has a better thermal performance of about 27% in comparison to an arrangement of linear GHEs with a value of 0.5 m for pipe spacing. In the second part of this study, the effects of three different parameters including soil thermal conductivity, buried depth, and the width of the flat-panel GHE on the thermal performance of the GHE have been investigated. The obtained results show that even though increasing buried depth enhances the thermal performance, the rate of enhancement decreases at the same time. Furthermore, it is established that increasing width is not of great significance when the GHE is more than 10 m wide. © 2019 Elsevier Ltd
  6. Keywords:
  7. Flat-panel ground heat exchanger ; Ground-coupled heat pump ; Horizontal ground heat exchanger ; Numerical simulation ; Computer simulation ; Geothermal heat pumps ; Numerical models ; 3-D numerical modeling ; Buried depth ; Ground heat exchangers ; Horizontal ground heat exchangers ; Pipe spacings ; Soil thermal conductivity ; Thermal Performance ; Thermal conductivity ; Greenhouse gas ; Numerical model ; Performance assessment ; Pipe ; Spacing ; Thermal power ; Three-dimensional modeling
  8. Source: Renewable Energy ; Volume 147 , March , 2020 , Pages 996-1010
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0960148119313709