Obtaining Drinking Water from Air Humidity
Not a plant to be seen, the desert ground is too 1 . But the air contains water, and research scientists have found a 2 of obtaining drinking water from air humidity. The system is based completely on renewable energy and is therefore autonomous.
Cracks permeate the dried-out desert ground and the landscape bears testimony to the lack of water. But even here, where there are no lakes, rivers or groundwater, considerable quantities of water are stored in the air. In the Negev desert in Israel, for example, annual average relative air humidity is 64 percent -- in every cubic meter of air there are 11.5 milliliters of water.
German research scientists have found a way of converting this air humidity autonomously into drinkable water. The process we have developed is based exclusively on renewable energy sources such as thermal 3 collectors and photovoltaic cells, which makes this method completely energy-autonomous. It will therefore function in regions 4 there is no electrical infrastructure, says Siegfried Egner, head of the research team. The principle of the 5 is as follows: hygroscopic brine saline solution which absorbs moisture runs down a tower-shaped unit and absorbs water from the air. It is then sucked into a tank a few meters 6 the ground in which a vacuum prevails. Energy from solar collectors heats up the brine,, which is diluted by the water it has 7
Because of the vacuum, the boiling point of the liquid is 8 than it would be under normal atmospheric pressure. This effect is known from the mountains: as the atmospheric pressure 9 is lower than in the valley, water boils at temperatures 10 below 100℃. The evaporated, non-saline water is condensed and runs down through a completely filled tube in a controlled manner. The gravity of this water column continuously produces the vacuum and so a vacuum pump is not needed. The reconcentrated brine runs down the tower surface 11 to absorb moisture from the air.
The concept is suitable for various water 12 Single-person units and plants 13 water to entire hotels are conceivable, says Egner. Prototypes have been built for both system components-air moisture absorption and vacuum evaporation-and the research scientists have already 14 their interplay on a laboratory scale. In a further step the researchers in-tend to develop a demonstration 15.
练习:
1. A dry
B dirty
C sandy
D clean
2. A path
B way
C channel
D road
3. A oil
B wood
C coal
D solar
4. A when
B what
C where
D who
5. A promise
B progress
C prospect
D process
6. A of
B with
C off
D below
7. A absorbed
B attracted
C allowed
D affected
8. A wetter
B hotter
C lighter
D lower
9. A close
B there
C beyond
D nearby
10. A gradually
B distinctly
C necessarily
D possibly
11. A again
B too
C either
D more
12. A users
B owners
C providers
D producers
13. A using
B obtaining
C supplying
D cleaning
14. A repaired
B sold
C copied
D tested
15. A tank
B method
C facility
D tool
参考答案 ABDCD CADBB AACDC
Come 的妙用(一)
有关“玩水”的英文表达
“脚踏两只船”怎么说
Come 的妙用(二)
中国人易错口语集锦(三)
分手时该说什么
嘴里的“特产”怎么说
88届奥斯卡颁奖礼精彩语录
西方人的谈吐技巧
“眼皮跳”怎么说
“藕断丝连”怎么说
吃东西常用表达(二)
“真是太好笑了”
“吃吃喝喝”的英文表达
“不许动”怎么说
中餐菜名翻译技巧
英汉词汇互译的若干方法
Come 的妙用(三)
“追捕”怎么说
“开玩笑”怎么说
吃东西常用表达(一)
中国人易错口语集锦 (二)
“搭讪女生”怎么说
“单身派对”怎么讲
如何回应别人的玩笑
“警察”种种
好用形容词选
恋爱中的欲擒故纵
“绅士风度”怎么说
“大惊小怪”怎么说
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |