求翻译：原因是由于夹层内空气温升甚微以致不能产生推动空气流动的足够的重力压差 , 故夹层内空气近乎停滞状态 , 此时集热墙就等效于无通风孔的集热墙了。是什么意思？

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This is because mezzanine inside the air temperature rise is minimal and does not generate air flow of sufficient gravity differential pressure, the mezzanine inside the air near stagnation, and at this point the wall is equivalent to no ventilation holes in the wall.

The reason is so that because in the band the air temperature rise really micro cannot have the impetus air transport enough gravity differential pressure, therefore in band air approaching stationary state, this time collection hot wall on equivalent in non-air vent collection hot wall.

Is due to air inside the sandwich has little temperature rise that cannot produce enough gravity to promote air flow differential pressure, so the sandwich in the air near a standstill, solar collecting wall is equivalent to a heat vent-free wall.

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