AC Mythbusters<br />Why you really can’t have AC in Misawa<br />
Wouldn’t it use more power to run 8 fans than to run central air or window units?<br />
No! A typical box fan is rated at 100w and uses 74kWhr if run continuously for 1 month. Eight such fans would use about 600 kWhr in one month.*<br />*standing fans and even the largest ceiling fans use even LESS power<br />
An efficient central air system sized for a 1500 sq ft home run for 15 hours/day would consume 2000kWhr/month or almost 3.3X as much power as 8 fans.<br />
Five window units sized for a 1500 sq ft home run for 15 hours/day would consume 2600kWhr/month or 4.3 X as much power as 8 fans!<br />
I heard that you can power AC units with solar panels placed on the top of your roof. Why don’t we do that at Misawa?<br />
An efficient central air system sized for a 1500 sq ft home run for 15 hours/day would consume 2000 kWhr/month. Solar systems rated to supply solar power to a 1500 sq ft home only supply about 400kWhr/month with 5 hours of peak sunshine.<br />
This means that even if we had extensive roof tops available (which we don’t as most residents live in towers), the solar systems would supply about 1/5th the power needed to operate the AC system.<br />
Also, they are EXTREMELY expensive. The system for a 1500 sq ft home costs about $12,500. This means it would take over 20 years for this system to pay for itself.<br />
Why can’t we have window units if we pay for them out of our own pocket?<br />
We do not have the capacity on base to accommodate all family members.<br />Our limitation is based on the instantaneous demand of all users on base<br />Base housing is supplied by substation 1 & 2 which are limited to contracted max power of 18,535kW<br />This limitation ensures our aged system is protected from damage in the case of an over-demand event<br />
Currently, our August maximum demand is approx 16,400kW which means our available excess capacity is 2135kW<br />A typical family housing unit with window units would consume 5kW – this means the base could accommodate about 425 families before exceeding maximum capacity (maybe a few more since they won’t be running fans any more)<br />There are over 2000 housing units at Misawa!<br />
Remember, allowing those 425 families to have AC would mean over 1500 families would not have AC! Neither would Sollars, Cummings, Edgren, the Misawa Inn or Unaccompanied Housing.<br />
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