60秒科学:冬暖夏凉的屋顶

Lowering the Ceiling on Roof Energy Losses

Buildings consume about a third of the energy and two-thirds of the electricity in the U.S. Roofs are a good place to try to cut those figures. Because traditional black asphalt roofs heat up in summer and strain the air conditioners. White roofs are better. But they don’t retain heat in winter, so furnaces work harder.

Now scientists from the United Environment and Energy company think they have a roof fix, which they presented at a recent meeting of the American Chemical Society.

Via a proprietary¹ technique, the researchers turn waste cooking oil into a liquid polymer, which hardens after application. As a roof coating, the polymer can reflect or absorb depending on conditions: it changes reflectivity at a particular temperature and so goes from reflecting light and emitting heat in the dog days to absorbing light and retaining heat in the cold.

The company claims that the coating cools traditional roofs by 50 to 80 percent in summer, and holds on to about 80 percent more warmth than a white roof in the winter. If it pans out, the cooking oil roof coating could be a productive use for our national obsession² with French fries.
 

1 proprietary   

n.所有权，所有的；独占的；业主

参考例句：

• We had to take action to protect the proprietary technology.我们必须采取措施保护专利技术。
• Proprietary right is the foundation of jus rerem.所有权是物权法之根基。

2 obsession   

n.困扰，无法摆脱的思想(或情感)

参考例句：

• I was suffering from obsession that my career would be ended.那时的我陷入了我的事业有可能就此终止的困扰当中。
• She would try to forget her obsession with Christopher.她会努力忘记对克里斯托弗的迷恋。