Abstract
GSHP are of strategic and necessary part for the efficient utilization of renewable energy and energy conservation. Vertical ground heat exchanger system is one form of GSHP and it is a way to solve the problem of the imbalance between cooling load and heating load except for some extreme hot or cold climate areas. In the paper, the study of underground heat exchanger heat transfer mode, and the influence law of the borehole diameter, shank spacing, and grout conductivities on thermal resistance of borehole are discussed systematically.
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