VOA慢速英语 Making a Solar Water Heater
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.
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.
[小精 灵 儿童 网站]
- VOA慢速英语 一个为世界带来光明的医疗组织
- VOA慢速英语 在美国如何写论文
- VOA慢速英语 在社区学院免费就读一年
- VOA慢速英语 种生菜 其乐无穷
- VOA慢速英语 游历十大即将消失的旅游胜地
- VOA慢速英语 废奴运动中堪萨斯州采取措施改变状况
- VOA慢速英语 美国墨西哥全力以赴对抗猪流感
- VOA慢速英语 哈勃改变了我们对宇宙的概念
- VOA慢速英语 骨质疏松症增加骨折风险
- VOA慢速英语 七位环保先锋获得戈德曼环境奖