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[report整理] SENEWS-2011-04-25

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[Homework]SENEWS-2011-04-25

本帖最后由 spring25autumn 于 2011-4-25 10:57 编辑

This is the VOA special English Techonolgy report.
Solar water heaters are used around wrold and are not very difficult to build.The system we are going to descibe is basiced on the design develop some years ago in the Afhganistan.Since then it has been built and used in many countries.It can heat 70 liters of water to 60 degrees celsius.It can do this between sun rise and noon on the clear day with average air tempurature of 32 to degrees celsius.
There are two parts of solar water heater,one part is made of sheet of metal pianted black.Black services become hotter in the sun than services painted in the other colour.This black metal played is called a collector.The collector is placed in contect with the water.There are seveal kinds of metal sheets that can be used for the collector.Crogaded metal will work very well ,Crogaded sheets are often used as oops on housing.Once the water is heated ,it is kept hot with insolation meterial.

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