The incident product factor of the evacuated solar energy collector tube is introduced for simplifies calculation about it.
为了简化真空太阳集热管能量采集的计算，提出了真空太阳集热管入射乘积因子的概念。
Distributive feature of the incident product factor are described, and take the example of Beijing, collected energy of the evacuated solar energy collector tube are calculated.
描述了入射乘积因子的分布特点，并以北京为例，计算了真空太阳集热管采集的能量。
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