这两种装置在阳光充足的气候条件下工作良好；但在北欧，太阳可能一次被云层遮挡数周，而温度不仅随着季节变化，而且还随着昼夜变化。
Both these devices worked well in sunny climates; but in northern Europe, the sun may be hidden by clouds for weeks at a time, while temperatures vary not only seasonally but from day to night.
当空气向山坡的迎风面上升时，若果水份充足及环境温度够低，空气中的水份便会凝结成云。
When air travels up the wind ward slope of a mountain it condenses to form clouds if it is sufficiently moist and the surrounding is sufficiently cool.
舒适度——室内光线充足，温度适宜。
Comfort — enough light and favorable temperature can be provided.
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