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Beyond the affinity laws

The affinity laws are frequently cited for energy savings calculations in VSD applications with pumps and fans, and they are just as frequently...
Engineered Systems, 08/01/04 by Tumin Chan · More from publication
A Chiller challenge

Does design sometime lag behind the available technology? Using a new convention center as an example, the author suggests how a chiller...
Engineered Systems, 05/01/02 by Tumin Chan · More from publication
The affinity laws are inadequate in the 'real' world. Agreed?

(EDITOR'S NOTE: Engineered Systems introduced OPO ["One Person's Opinion"] in 1997. It is designed to allow readers to express their opinions on an...
Engineered Systems, 10/01/99 by Tumin Chan · More from publication

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Your Work Five Ways to Speak Like Obama

Five Ways to Speak Like Obama

Barack Obama is a master at grabbing and keeping his audience's attention, which is the number one goal of any public speaker. How does he do it? Here are five key lessons from Obama's rhetorical playbook.
Your Industry Google's Secret Weapon for Chrome OS: YouTube

Google's Secret Weapon for Chrome OS: YouTube

Yesterday Google showed off its forthcoming Chrome OS, leaving many to wonder how exactly the company will monetize it. The answer: it won’t. Since Google derives 97% of its revenue from online ads, it simply wants you using a computer that is always online. Specifically, it wants you on a computer that is one click [...]
Your Money Dumbest Things You Do With Your Money

Dumbest Things You Do With Your Money

Even smart people make financial moves that are downright illogical. Emotions and superstitions have a sneaky way of keeping you from rational financial decisions. But dumb choices can have serious, real-world consequences. Here are some of the biggest blunders we all make, plus tips from the experts on how to keep cool.