...能效系数,回填材料,导热系数,位置,厚度, [gap=1039]Keywords：U-tube ground heat exchanger,soil stratification,energy efficiency coefficient,backfill material,thermal conductivity,position,thickness, ..
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The results also make it clear that heating coefficient and primary energy efficiency of whole heating system should be adopted to evaluate the energy utilization of each heat pump system.
还表明应以整个供热系统的供热系数和一次能源利用系数来衡量各热泵系统的能量利用性。
Coupling coefficient (k) of a transformer is a key parameter affecting the efficiency of a contactless energy transmission system.
在非接触电能传输系统中，变压器的耦合系数直接关系到系统的变换效率。
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