Some ambiguous problems often encountered in the design of passive solarhouses have been discussed in the paper so as to get a clear understanding and a correct design.
本文讨论了在被动式太阳房热工设计中常遇到的一些模糊问题，目的是明确认识，做到正确设计。
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In reality, solar cells that are on the roofs of houses and in consumer products have 14 to 18 per cent efficiency.