Abstract
The extensive application of ground-coupled heat pump system (GCHP) is restricted by the installation of conventional borehole ground heat exchangers (GHE). Combining the GHE and building foundation piles as “energy piles” can eliminate the drilling cost and land area requirement of a conventional borehole GHE. In this study, the accurate analytical thermal analysis is carried out for simulating the heat transfer process of the novel pile GHE with spiral coils. The temperature responses of the coil pipe wall and the circulating water entering/effusing the pile GHE to the short time step heat transfer loads are deduced based on the established analytical transient three-dimensional spiral source model. Then the operation performance as well as the heat exchange capacity of novel pile GHE is investigated and compared with conventional borehole GHE. The analytical solutions developed in this study can provide an appropriate and convenient tool for thermal analysis and design of the novel foundation pile GHE with spiral coils. It is believed to be a new contribution in the foundation pile GHE field.
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