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