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[report整理] SENEWS-2011-04-25

提高英语听力能力 找对方法很重要!

[Homework]SENEWS-2011-04-25

This is the VOA special English technology report.Solar water heaters are used around the world and are not very diffical to build.The system we are going to discribe is based on the disine developed some use ago in Afganstan.Since then it has been bulided and used in many conturies.It can heat 70 litres of water to 60 degrees celsius.It can do this between sunrise and noon on a clear day with an average air tempreture of 32 degrees celsius.There are two parts of the solar water heater,one part is made of a sheet of metal painted black;Black servers become hoter in the sun than servers painted in the other color,this black metal plate is called a collecter.The colleter is plays in contact with the water,there are several times of metal sheets that can be uesd for the collecter.Color gated metal will work very well.Color gated sheets are often used as roofs on the housing.Once the water is heated, it is kept hot with insulating material, this allows the water to stay warm for a long time.The second of the solar water heater holds the water for the system.This stroge tank can be a contaner that holds about 100 liters.Two rubber pipes are attach to the water storge tank,one pipe lets the water flow into the system,the other lets water flow out.When the water heater is working correctly, water will flow from the stroge tank to the collecter and back again.You can use water at the top of the tank for washing and cleaning.You can change the flow of water , so the tempreture is hot or warm as disired.This solar water heater is easy to build and operat.It will less about two years before the rubber pipes need to be replaced.There is also something else you will need to make the solar water heater work.The sun as you might imagin,the heater will heat water only on sunny days.You can get more information about solar water heaters and other project from enterprise works viter.This grope works internationally to fight poverty.The website is enterprice works doc orgs.Choose the link for news and resources then click on popublications.And that's the VOA special English tecnology report.Talers if you ever bulid solar water heater or have ideas for improvements,poases your commoms at VOA special English.com. or you can also find chanscripes,MP3s and popcats of our programs.We also offer English teaching activites in the classroom section of our site.I'm stepheber.
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