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发表于 2012-5-26 02:34:35
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10万元是人民币吧?确实是很少,有点不识货(即不懂知识的价值)的感觉。我曾经讲过一个真实的故事,说是热工专家田长霖在上世纪六十年代受朋友之邀去一炼钢厂参观指导,就一天,厂方给他一千美元,他提出了两条节能建议,后来厂方都采纳了:
Coolboy wrote and submitted his first paper [13楼,14楼]
http://bbs.lasg.ac.cn/bbs/thread-35262-2-5.html
Here is an interesting story of how later professor Chang-Lin Tien made $1,000 in one day. $1,000 is not worth much these days but it was worth a lot in 1960s when the story happened. As a result, Chang-Lin Tien was very proud of himself while telling this story. One of Chang-Lin Tien’s friends was a manager in a steel company and, one day, he invited Chang-Lin Tien to pay a visit to the company because he heard people saying that this professor was a smart scientist.
Chang-Lin Tien, who also specialized in radiation, was known to many Chinese scientists:
http://www.berkeley.edu/news/media/releases/2002/10/tien.html
Chang-Lin Tien’s friend would pay him $1,000 if professor Tien was able to visit and stay in the factory for one day, to be accompanied by factory technicians and look around the factory, and possibly to make some suggestions at the end of the visit. After receiving the $1,000 check, Chang-Lin Tien made the following two suggestions to save energy that were all adopted later by the factory:
(1) To replace the existing wires/cables with thicker ones [that would reduce the heat dissipation of those wires];
(2) To install iron meshes in the furnace chimneys [to raise the furnace temperature].
He did not mention the reasons for his suggestions and I added those in the above brackets. The first suggestion indicates that those were electric furnaces and thicker wires would reduce the electric resistance of those wires when the electric power was supplied to the furnaces. I got this figured out long after his speech because my thought kept dwelling on his second suggestion at the time. I said to him: your idea of iron meshes in chimneys was the atmospheric greenhouse effect, right? He said to me: you are exactly right!
Here was my thought: processing iron into steel requires high furnace temperature to let impurities within iron to be exhausted and evaporated, AND we also need chimneys to allow the hot air with impurities to escape from the furnace. At the same time, a lot of heat is also escaped from those chimneys through two processes: (i) convection and (ii) radiation. The installed iron meshes still allow the hot air with impurities to pass but will absorb the higher radiance from the furnace, re-emit part of the absorbed energy back to the furnace, and thus raise the furnace temperature, which is exactly the same as CO2 in the atmosphere raising the surface temperature. |
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