地下蓄能热扩散和传输的能流通量描述

Description of energy flux on thermal diffusion and transport in underground thermal energy storage

通过对地下蓄能系统能量输入、存储和输出过程中的能量传输问题的研究,提出地下岩土蓄能能流通量的概念。通过衡量蓄存能量的扩散传输程度,定量分析判断地下蓄能过程的能流效应,为控制扩散提供了衡量参数和依据。在此基础上,研究了不同排列竖孔地下换热器群布置形式的能流问题以比较它们在保存土壤蓄能期间能流强度的差别。研究发现,孔群布置决定地下温度场形态,该温度场形态对能量输入、输出及蓄存的自由扩散传输程度产生明显的影响。

Based on the investigation of the heat transfer of the energy diffusion and transport during the processes of the energy input, storage and extraction in the underground thermal energy storage （UTES） system, a new concept, the energy flux, was presented to evaluate the effect of the thermal energy storage. Through measuring the diffusion transport degree of storaged energy, the effect of energy flux in the UTES can be analyzed quantitatively, providing a measuring parameter and a basis for the heat diffusion control. Based on this, the energy fluxes of the underground heat exchanger group with different configurations and different multi borehole arrangements were studied to compare their difference on the energy flow intensity in the period of conserving energy stored in soil. The results show that the exchanger group configuration and the multi-borehole arrangement determine the underground temperature distribution which plays an important role in the energy diffusion and transport during the processes of energy input, storage and extraction.