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选取无穷远边界值,利用三维数值模型对无渗流条件下地埋管换热器传热过程进行动态模拟,研究了地埋管换热器能效系数的主要影响因素。结果表明,增大岩土体导热能力和埋设深度及适当减小管内流速能够提高地埋管换热器的能效系数,而加大支管间距仅能在较短换热时间内提升地埋管的换热能效;采用间歇运行模式,特别是小周期循环和较长时间温度恢复期,有利于提高地埋管换热器的能效系数;岩土体初始温度和地埋管进口温度的变化并不影响地埋管换热器的能效系数。
The boundary value of infinity is selected and the three-dimensional numerical model is used to simulate the heat transfer process of the buried tube heat exchanger under no seepage condition. The main influencing factors of the energy efficiency coefficient of the buried tube heat exchanger are studied. The results show that increasing the thermal conductivity and buried depth of rock and soil and properly reducing the flow velocity in the pipe can increase the energy efficiency coefficient of the buried pipe heat exchanger, while increasing the branch pipe spacing can only increase the exchange rate of the buried pipe in the shorter heat exchange time Thermal energy efficiency; the use of intermittent operation mode, especially the small cycle and a longer period of time temperature recovery is conducive to improving the energy efficiency coefficient of ground tube heat exchangers; rock and soil temperature and the inlet tube temperature changes did not change Buried pipe heat exchanger energy efficiency coefficient.