Aiming at the problem of poor heat storage performance of ordinary concrete as energy pile materials
phase change materials were introduced into ordinary concrete to construct phase change energy piles.The heat transfer process of ordinary energy piles and phase change energy piles was simulated by the finite element numerical model on simplified energy piles.The difference of heat transfer between the two energy piles was compared and analyzed.The effects of the mixing content on the heat transfer of the energy pile and the soil around the pile were studied by adding different mass fractions of phase change materials.It is found that the addition of phase change material can significantly delay the temperature rising and decreasing of the pile in the phase change range when the heat exchange tube absorbs or releases heat.The more the phase change material is added
the obvious the delay effect of temperature rising and decreasing.The phase change material added to the energy pile only has a significant effect on the heat transfer of the pile
while has little effect on the temperature field of the soil around the pile.
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