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A man in a hot-air balloon realized he was lost. He reduced altitude and noticed a woman below. He descended a bit more and shouted. Excuse me, can you help me? I promised a friend I would meet him an hour ago but I dont know where I am. The woman below replied, You are in a hot-air balloon approximately 30 feet above the ground. You are between 40 and 41 degrees north latitude and between 59 and 60 degrees west longitude. You must be an engineer, said the balloonist. I am, replied the woman, how did you know? Well, answered the balloonist, Everything you told me is technically correct, but I still have no idea how to interpret your information, and the fact is I am still lost. Frankly, yu havent been much help so far.

The woman replied, You must be in management. I am, replied the balloonist. But how did you know? Well, said the woman, You dont know where you are or where you are going. You have risen to where you are due to a large quantity of hot air. You made a promise which you cant keep, and you expect people below you to solve your problems. The fact is you are in exactly the same position you were in before we met, but now, somehow, its my fault.

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These formulas are valid under idealizations which include: (1) steady-state conditions; (2) negligible heat losses to the surrounding; (3) no phase changes in the fluid streams flowing through the exchanger.

2. : Data and Consulting Service (DCS).

3. : Accounting for (7), we have the following expression...

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A low mass systems show improved damping, a result of the increased loss factor [the loss factor z = c /(2 m)]. , [ z = c /(2 m)].

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