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

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What is efficiency worth? (you’d<br />

better know up front)<br />

◊ For example, consider the 25-y present value (10%/y<br />

real discount rate for a high-tech industry) of saving<br />

electricity in a chip fab at $0.08/kWh levelized, zero<br />

HVAC capex, nominal 1 kW/t HVAC + 10% parasitics<br />

1 watt of cleanroom power use and heat release =<br />

$9 opex…or " ~$10–11 including filters<br />

<br />

<br />

250 Pa (1"w.g.) of makeup/exhaust ΔP = $4.2 per L/s or $8.4/cfm<br />

(with standard fan efficiencies)<br />

Each percentage point’s efficiency gain in an 8,766 h/y motor in<br />

conditioned space = $152/kW = $113/hp<br />

◊ Without such metrics to know what efficiency is<br />

worth, you and your suppliers can’t invest in it wisely

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