考虑气温年变化的地面传热计算方法
Calculation approach of ground heat transfer considering annual variation of outdoor temperature
摘要：
现有的稳态分地带计算方法没有考虑土壤层强大的蓄热性能及导热系数的不同，地面传热量计算结果偏大。在该方法的基础上，将室外气温近似为其年平均值和一列1年周期正弦波相加，用三维动态有限差分法建立了地面传热计算模型，与稳态分地带方法的计算结果进行了比较。给出了土壤层不同导热系数和热扩散率下各地带的稳态传热系数及热流振幅和相位。
Abstract：
The calculation result of the current steady zoning calculation approach overestimates the ground heat transfer for failing to consider the large thermal storage ability of the ground and the difference in thermal conductivity. Based on this approach, treating the outdoor temperature approximately as the sum of its annual average and a sinusoidal wave with the period of one year, establishes a calculation model of ground heat transfer by three-dimensional dynamic finite difference method, and compares the calculation result by this method with that by the steady zoning calculation approach. Provides the steady heat transfer coefficients and the amplitudes and phases of heat flux in various zones under different thermal conductivities and thermal diffusivities of soil.
Keywords:ground heat transfer, soil, thermal storage, air temperature, annual variation, sinusoidal wave, thermal conductivity, heat transfer coefficient