Abstract
Energy piles, combined ground source heat pumps (GSHP) with the traditional pile foundation, have the advantages of high heat transfer efficiency, less space occupation and low cost. This paper summarizes the latest research on the heat transfer and bearing capacity of energy piles. It is found that S-shaped tubes have the largest heat transfer area and the best heat transfer efficiency; that energy piles need to be designed conservatively, such as adjusting the safety coefficient, number and spacing of the piles according to the additional temperature loads; and that unbalanced surface temperature has not been resolved, caused by uneven refrigeration/heating demand in one cycle. A composite energy pile applied to water-rich areas is proposed to overcome the decay of bearing and heat transfer performance. Besides, most of the heat transfer models are borehole-oriented and will fit for energy piles effectively if the models support variable ground temperature boundary conditions.
Highlights
Traditional fossil fuels such as coal, oil, and natural gas account for most of the energy share
Vertical and horizontal layouts are the two forms of Ground source heat pumps (GSHP), in which the horizontal layout requires a large construction area but the vertical one is costly due to borehole drilling. Considering these two shortcomings, energy piles that embed the geothermal heat exchanger in the pile foundation of the building structure offer a new idea for the promotion of GSHP and simultaneously meet the load-bearing and heat exchange requirements
The heat transfer efficiency, load capacity, and durability of energy piles are reduced by damaged tubes
Summary
Traditional fossil fuels such as coal, oil, and natural gas account for most of the energy share. Mohamad explained the knowledge about the thermal and thermo-mechanical behaviors of energy piles [12] Their works, do not address the operational mechanism and optimization of energy piles under thermal-mechanical interactions. Their works, do not address the operational mechanism and of energy pilesof [12].
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