쉐도잉 연습: Learn English with VOA Special English - How to Make Your Own Solar Water Heater - YouTube로 영어 말하기 배우기

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This is the VOA Special English Technology Report.
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This is the VOA Special English Technology Report.
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Solar water heaters are used around the world and are not very difficult to build.
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The system we are going to describe is based on a design developed some years ago in Afghanistan.
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Since then, it has been built and used in many countries.
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It can heat 70 liters of water to 60 degrees Celsius.
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It can do this between sunrise and noon on a clear day with an average air temperature of 32 degrees Celsius.
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There are two parts to the solar water heater.
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One part is made of a sheet of metal painted black.
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Black surfaces become hotter in the sun than surfaces painted any other color.
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This black metal plate is called a collector.
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The collector is placed in contact with the water.
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There are several kinds of metal sheets that can be used for the collector.
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Corrugated metal will work very well.
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Corrugated sheets are often used as roofs on housing.
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Once the water is heated, it is kept hot with insulation material.
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This allows the water to stay warm for a long time.
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The second part of the solar water heater holds the water for the system.
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This storage tank can be a container that holds about 100 liters.
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Two rubber pipes are attached to the water storage tank.
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One pipe lets water flow into the system.
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The other lets water flow out.
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When the water heater is working correctly, water will flow from the storage tank to the collector and back again.
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You can use the hot water at the top of the tank for washing and cleaning.
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You can change the flow of water so that the temperature is hot or warm as desired.
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This solar water heater is easy to build and operate.
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It will last about two years before the rubber pipes need to be replaced.
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There is also something else you will need to make the solar water heater work, the sun.
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As you might expect, the heater will heat water only on sunny days.
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You can get more information about solar water heaters and other projects from Enterprise Works VITA.
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This group works internationally to fight poverty.
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The website is EnterpriseWorks.org.
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Choose the link for news and resources,
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then click on publications for VOA Special English I'm Alex Villarreal to read and
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listen to more stories about technology and for English teaching activities go
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to VOA special English comm we're on Facebook Twitter and iTunes at VOA learning English
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"Learn English with VOA Special English - How to Make Your Own Solar Water Heater"으로 쉐도잉 기법을 사용해 영어를 연습합니다.

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