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Build your own solar water heater by Stu Campbell

By Stu Campbell

Книга construct your personal sunlight water heater construct your personal sun water heaterКниги English литература Автор: Stu Campbell Год издания: 1978 Формат: pdf Издат.:Garden manner Pub Страниц: 109 Размер: 2,4 ISBN: 0882661299 Язык: Английский0 (голосов: zero) Оценка:Build your individual sunlight water heater

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27 1st Glazing 2nd Glazing (Optional) Figure 23. This inexpensive solar water heater is described by Farrington Daniels in Direct Use of the Sun's Energy. The 6-foot by 4-foot box sits in ground which has been dug out slightly. Polyethylene film is laid in the tray to hold water, and a black plastic sheet is laid over the top of the 2-inch deep water layer. A second wooden frame covered with a plastic like Ted¬ lar or Mylar fits snugly over the top of the first. The air space between the upper cover and the black plastic makes a good heat trap.

And when there is wind, the "chill factor" increases heat loss by almost a degree for every mile an hour of breeze. Keep that in mind. 5. Snow Depth. Will snow cover your collectors? Study the roof for a winter to see. Snow slides off roof-mounted solar collectors if the roof is steep enough, but it can drift and settle into the valleys where roofs come together. Collectors that are tucked into shaded corners like this can be obscured from the sunlight (Figure 39). Figure 38. As you plan your solar system, take a close look at the site.

0 Table 9. Architects, contractors and solar engineers sometimes express roof pitch differently. Instead of stating the pitch In degrees they often think in terms of inches per foot. A three-on-twelve pitch means that the roof rises 3 inches for every 12 inches of horizontal distance. This table can help you make conversions from one to the other. A 2-on-12 pitch is roughly equivalent to 10 degrees of steepness, while a 12-on12 pitch is equal to 45 degrees. On some solar homes roof pitch may be greater than 45 degrees.

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