Abstract
A deeply buried pipe energy pile (DBP-EP) combines the advantages of a ground source heat pump (GSHP) and an inside buried pipe energy pile (IBP-EP) and is an efficient, clean, and energy-saving technology. Based on field tests and numerical simulations, this paper explores the temperature distribution and heat exchange effects of DBP-EP under different influencing factors. The results show that when the pile-to-well ratio is approximately 0.3–0.4, the heat exchange of the energy pile obtains the best benefit; the inlet water temperature is the most significant factor affecting the heat exchange effect of the energy pile, and when combined with a reasonable pile-to-well ratio, the energy pile obtains the best heat exchange effect; the flow rate has a significant impact on the heat exchange effect of the energy pile, but needs to be set reasonably according to the pile-to-well ratio; the influence of inlet water temperature, well depth, flow rate, and pile length on the heat exchange efficiency of the energy pile is gradually weakened. The research results of this paper provide a theoretical basis for the structural design optimization of DBP-EP and promote the popularization and application of energy pile technology.
Highlights
Energy piles are a new shallow geothermal utilization technology in which different numbers of heat exchange tubes are embedded in the pile foundation of the building structure according to a specific form
Based on the numerical simulation technology the temperature distribution characteristics of spiral buried pipe energy pile were studies and the results showed that when the energy pile is used for heating, the buried pipe is used as the starting point, and the temperature in the pile decreases parabolically away from the buried pipe (Ascending)
This paper conducted field and simulation tests on the heat exchange of deep buried pipe energy piles, analyzed the heat exchange law of deep buried pipe energy piles under four different influencing factors and obtained the following conclusions: (1) An increase in well depth can weaken the influence of pile length on the heat exchange effect of energy piles, so the pile well ratio is an important factor affecting the heat exchange effect of energy piles
Summary
Energy piles are a new shallow geothermal utilization technology in which different numbers of heat exchange tubes are embedded in the pile foundation of the building structure according to a specific form. The results of thermal response analysis of the energy pile showed that the operation mode and heat injection rate will affect the temperature change of the soil around the pile, which in turn affects the performance of the system; they found the number of loops, the location of the pipeline and the concrete, and the thermal conductivity significantly affect the thermal interaction between the water inlet and outlet pipes [28,29]. The effects of well depth, pile length, inlet water temperature and flow rate on the heat exchange performance of energy piles are considered in this test. When the circulating water in the heat exchange pipe circulates in the buried pipe and exchanges heat with the concrete pile or the soil of the deep well, the temperature of the circulating water changes with time and reaches stability At this time, the temperature difference between the inlet and outlet tends to be stable. (4) The influence of groundwater on the heat exchange of energy pile is ignored. (5) The change of soil temperature along the depth direction is ignored. (6) The influence of environmental factors on shallow soil temperature is ignored
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