A passive solar system requires no purchased fuel but needs to be carefully designed for the site.
2.
In genuine " "'direct gain passive solar systems " "', sufficient thermal mass is required to prevent large temperature fluctuations in indoor air; more thermal mass is required than in a sun tempered building.
3.
Secondly, the purpose is to find a solution so as to warm the building in winter and protect it from the sun in summer, using passive solar systems that are incorporated into the building, as well as taking environmental resources such as wind, sun and vegetation into consideration.
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