但是由于其周围温度环境(辐射、热传导及对流状况等)与电机内部的发热规律不一致，所以不能对电动机进行有效的保护。
But because of the temperature environment (radiation, heat conduction and convection) and the internal heat of the motor is not consistent, so we can not effectively protect the motor.
分析表明系统中存在传导、对流及辐射传热，其中封闭空气夹层又存在层流自然对流。
The analysis demonstrates that the conduction, convection and radiation heat transfers occur in the system while the laminar flow and natural flow exist in the closed space.
其中，辐射及对流传递主要集中在玻璃上，传导传递主要在窗框及玻璃，而空气渗漏则大部分是由门窗结构不合理或密封材料品质不佳造成的。
The radiation mainly happens on the glass surface, and the transmission on the window frames and glass. The air leakage is mostly owing to the improper window structure or bad sealing.
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