For building heating systems with a deep-buried coaxial double-pipe, its heat transfer performance was studied using three evaluation parameters in five heating periods under five factors and the corresponding four levels. The three evaluation parameters are time-averaged heat transfer per meter Q_L-a, time-averaged performance parameter COP_-a of heat pump unit, and five-year decay rate of heat exchange rate R_d-5. The five factors are buried pipe depth, water flow rate, inlet water temperature, geothermal gradient, and thermal conductivity of ground. The levels for each factor were selected in combination with practical problems. Sixteen sets of orthogonal simulation conditions (L₁₆4⁵) with five factors and four levels were designed following the Taguchi method. Using signal-to-noise ratio and analysis of variance, Q_L-a, COP_-a, and R_d-5 were evaluated under various factors and levels. The optimal combination of various factors for the best heat transfer performance of buried pipe and the contribution rate of each factor to the heat transfer performance of buried pipe were obtained.

对于带有深埋同轴双管的建筑采暖系统，使用五个评估阶段的三个评估参数，五个因素和相应的四个级别来研究其传热性能。这三个评估参数分别是每米的时间平均传热Q _L-a，热泵单元的时间平均性能参数COP _-a和五年的热交换率衰减率R _d-5。这五个因素是埋管深度，水流量，进水温度，地热梯度和地面的热导率。结合实际问题选择每个因素的水平。十六套正交模拟条件（L ₁₆ 4⁵）根据田口方法设计了具有五个因素和四个水平的五个因素。使用信噪比和方差分析，在各种因素和水平下评估了Q _L-a，COP _-a和R _d-5。获得了最佳的埋管传热性能的各种因素的最佳组合，以及各因素对埋管传热性能的贡献率。