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[report整理] SENEWS-2011-04-25

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[Homework]【整理】SENEWS-2011-04-25

HOMEWORK
This is the VOA special English Technology Report.
Solar water heaters are used around the world and not very difficult to build.The system we are going to decribe his base on a design developed some years ago in A.Since then,it has been built and used in many countries.
It can heat 17 liters of water to 60 degrees celsius.It can do this between sunrise and noon on a clear day with average air temperature of 32 degree Celsius.There are two parts to solar water heating.One part is made of a sheet of mental painted black.Black services become hoter in the sun than services painted in the other color.
This black metal plate 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. <> metal will work very well.<> sheets are often used as roofs on housing.
Once the water is heated,it is <> hot with insolation 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 storage tank can be a container that holds about 100 liters.Two <> are attached 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 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 solar water heater is easy to build and operate.It will last about 2 years before the <> pipes need to be replaced.There is also something else you will lead to make the solar water heater 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 interprice<>.This group works internationally to fight powerty.The website is enterpriseworks.org.
Choose the link for news and resources then click on publications.

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