Efficient room A/C info request [RE-wrenches]

[William Korthof]

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Most of the window AC manufactures offer a range of product
sizes and efficiencies. They all offer "maxed out" 120 volt units;
basically, units with a capacity around 16,000 BTU/hour and a
draw of 11-12 amps @ 120 VAC. These relatively inexpensive
units are designed for 10-20% higher efficiency (~12 SEER) to
get the maximum output from a normal wall socket. That works
out to a 4.7 kW heat removal---in steady state conditions, the
unit would run at ~25% for the application. Not a big energy
penalty.

One or two Outback inverters, or one SW inverter should be
able to handle the combined server + AC load, and would have
the desired built-in AC pass transfer relay. Now, sell a 5 kW
solar array as a way to extend the UPS autonomy for a very
long time.

/wk

At 05:10 PM 10/30/2003, Allan Sindelar wrote:
>Fellow Wrenches:
>We have been asked to provide a UPS system for a local medical billing
>service company that needs uninterruptible AC power for servers, etc. The
>server room measured out with a Brand meter as a constant 1.03 kw-hr/hour
>load. There is a window-mount air conditioner that cycles on and off to draw
>heat off of this otherwise windowless room. The A/C uses a 20A 250VAC
>circuit. Some cooling must be part of the UPS load.
>
>We are looking at more efficient ways to replace this A/C. We have 1.03 kwh
>of constant heat being produced, plus summer ambient temps into the 90s. It
>has to be foolproof without needing attention; run off grid power when it's
>available, and battery/inverters when not. We haven't determined the design
>period of autonomy yet, but it shouldn't be necessary for this question.
>
>  I know nothing about air conditioners. Are there any high-efficiency 120VAC
>window-mount units that can maintain normal (75F) temperatures with this
>load? This is not a "solve my needs at any cost" job, either: solutions must
>be relatively simple and at reasonable cost, but load reduction is always
>cheaper than system capacity.
>
>Looking for advice, please.
>Allan
>
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