Talk:Countercurrent exchange

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I believe that this article contains an error. It says, speaking of cocurrent exchange, that

"It can't achieve more than 50%, because at that point, equilibrium is reached, and the gradient declines to zero."

The article never mentions any assumption that the two flows are equal, so for instance you could have 1 lb/hr of water at 100°F heating 100 lbs/hr of water at 50°F and both streams could end up near 50.5°F. I'm going to change the article.