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[report整理] SENEWS-2011-04-25

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Home work
Home work

This is the voa special english technology report

solar water heaters are used around the world and another very difficult to build the system we are going to design is based on the design developed some years ago in **** since then it has beed built and used in many countries it can heat seventy leaters of water to sixty degrees *** it can do this between sunrise and noon on a clear day with average air temperature of thirty to degrees ***

there are two parts of the solar water heater one part is made of ** materal painted black balck services become hot in the sun then services painted any other color this black metal plate is called a collector the collector is placed in contact with water there are several kinds of metal ** that can be used for the collect corrugate materal will work very well corrugate sheets are often used as roofs on houseing once the water is heated it is capped hot with isolation material this allows the water dislay warm for a long time

the second part the solar water heater holds the water for the system this storage tank can be a container that holds about one hundred litters two rubber pipes are attached 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 collect 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 the temperature is hot more warm as desired this solar water herate is easy to built and operated it relax about two years before the rubber pipes need to be replaced that was also someting else  you will need to make the solar water heate work the sun as your might imagine the heate water only on sun days you can get more informations about solar water heates  and other projects from interplays works wite

this group works internationally to fight poverty the website is interprise works.org choose the link for news and ** then clic on the publications

and that is the voa special english technology report ** if you ever built solar water heate or have ideals for imporvement  post your comments at voa special english.com  or you can also find ** mp3 and broadcast of our programmes we also offer english teaching activities in the classroom section of our site  I am stevem meber
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