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[report整理] SENEWS-2011-04-25

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[Homework]【整理】SENEWS-2011-04-25

Solar water heaters are use around the word and are not very difficult to build. The system we are going to described is based on the design develop some years ago in***. Since then it has been built and use in many countries. It can heat 70L of water to 60 degree . It can do this between some lights and noon on a clear day with an average air temperature of 32 degrees ***. They are two parts of the solar water heater. One part is made of a *** painted black. Black service become hotter in the sun that. Then surfaces painted in the other color. This black metal ``` is called a collector. The collector is place in contact with the water. There are several kinds of metal``` that can used for the collector. *** metal will work very well. *** are often used as roofs on housing. Once the water is heated it is *** with *** material. This allows the water to stay warm for a long time. The second part of the solar water heater holds the water for the system. This ***tank can be a container that holds about 100L. 2 rubber pipes are touched to the water story ***. 1 pipe lets water flow into the system. The other let water flow out. When the water heater is working collectively water will flow from the *** 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 the temperature is hot or warm as designed. This solar water heater is easy to built and operate. It will last about 2 years before the rubber pipes need to be replaced. That results something else you will need to know to make the solar heater water work the sun as you might imagine the heater will heat water only on sunny days. You can get more information about solar water heaters and other projects from inter praise works ***. This group work internationally to find property. The website is enterpraisework.```. Choose a link for  news and researchers then click on publications.  

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