VOA慢速英语 Making a Solar Water Heater

日期:2010-04-27
分类:英语新闻

  Making a Solar Water Heater

  Directions for a system that can heat seventy liters of water to sixty degrees Celsius. Transcript of radio broadcast: 19 April 2009

  This is the VOA Special English Development Report.

  Solar water heaters are devices that use energy from the sun to heat water. Solar water heating is used around the world.

  The solar water heater described here is based on a design developed some years ago in Afghanistan. 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 a clear day with an average outside temperature of thirty-two degrees Celsius.

  VOA慢速英语 Making a Solar Water Heater

  There are two parts to the solar water heater. One part is made of a sheet of metal painted black. This metal surface, placed in contact with the water, will heat the water. Black-painted surfaces that receive the sun"s heat become hotter than surfaces of any other color.

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