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[report整理] SENEWS-2011-04-25

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[Homework]SENEWS-2011-04-25

This is the VOA Special English Technology Report.
Soler water heaters are used around the world and are not very difficult to build. The system will go in to describe it is based on the design developed some years ago in the Afganistan. Since then it has been built and used in many countries. It can heat seventy liters of water to sixty degrees celsius. It can do this between sunrise and noon on the clear day with an average air temperature of thirty-two degrees celsius.
There are two parts of soler water heater. One part is made of a sheet of metal painted black. Black surfaces become hotter in the sun than surfaces painted in the other colors. This black metal played is called a collector. The collector is placed in contact with the water. There are several kinds of metal sheets that can be used for the collector. C* metal will work very well. C* sheets are often used as roups* on the housing. Once the water is heated, it is capped hot within sernation* material. This allows the water to stay warm for a long time.
The second part of the soler water heater holds the water for the system. This storage tank can be a container that holds about one hundred liters. Two rubber pipes are retach* to the water storage tank. One pipe lets water flow into the system. The other lets water flow out. When the water heater is working correctly, water will flow from the storage tank to the collector and back again. You can use the hot water at the top of the tank for washing and cleaning. You can change the flow of water so that temperature is hot or warm as designed.
This soler water heater is easy to build and operate. It was less about two years before the rubber pipes need to be replaced. Their resources something else you will need to make the soler water heater work the sun as you might imaging the heater will heat water only on sunny days. You can get more information about soler water heaters and other projects from enterprise works viter. This group works internationally to find property. The website is enterpriseworks.org. Choice the link for a news and resources then click on publications.
And that's the VOA Special English Technology Report. Tell us if you ever build the soler water heater or have ideas for improvements. Post your comments at voaspecialenglish.com. You can also find transcripts, mp3s and podcasts of our programs. We also offer english teaching activities in the classroom section above our site. I'm Steve Ember.

This post was generated by put listening repetition system,  Check the original dictation thread!
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