Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 76, Issue -, Pages 394-405Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2016.12.020
Keywords
Ground-coupled heat pump system; Hybrid ground heat exchanger; Mixing outlet water temperature; Load ratio; Heat transfer performance
Categories
Funding
- National Natural Science Foundation of China [51576023]
- 111 Project [B13041]
- National Key Research and Development Program of China [2016YFC0700406]
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The hybrid ground heat exchangers (GHEs) of ground-coupled heat pump (GCHP) systems refer to a GCHP system using both vertical and horizontal GHEs. With the proposed optimal load ratio of horizontal to vertical GHEs, three-dimensional numerical heat transfer GHE models were established using independent heat transfer calculation method, and a design method for hybrid GHEs of GCHP system was put forward and then applied in one project. A combined heat transfer calculation method considering the mixing outlet water temperature was proposed and validated by a built experimental platform, which shows an improvement in accuracy prediction compared to the independent heat transfer calculation. It indicates the mixing outlet water temperature plays an important role in calculation accuracy and should serve as the boundary condition in modelling. The heat transfer performance of GHEs can be characterized by the independent heat transfer results in a certain range of load ratio. (C) 2017 Elsevier Ltd and IIR. All rights reserved.
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