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Advanced Energy Efficiency, Lecture 2: Industry - Rocky Mountain ...

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Pipe fittings: none are best<br />

◊ Equivalent-length / pipe-diameter loss<br />

coefficients:<br />

<br />

<br />

<br />

<br />

~2 for a pipe coupling or union<br />

~17 for a 45˚ elbow<br />

~75 for a 180˚ return bend<br />

Typically ~300 for a wide-open or ~475 for a half-open<br />

globe valve (!)<br />

◊ Pipe layout needs to be simple, even ugly,<br />

without “pretty” right angles<br />

◊ Avoid constrained entering/leaving conditions<br />

that kill pump efficiency: there’s generally<br />

space to do it right, and if there isn’t, make<br />

some more

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