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

[Doug Pratt]

Hi Allan,
  The Energy Star site is your salvation for off-the-shelf efficient
appliances. This great consumer site tells you everything you need to
know about a particular appliance to be a smart shopper, then lists all
the most efficient units by make and model. The basic site address is
www.energystar.gov. Here's a link to the Room Air Conditioners page.
http://www.energystar.gov/index.cfm?c=roomac.pr_room_ac 

1 kWh = 3414 BTU, so you're looking for an AC unit in the 4,000-5,000
BTU range. Fairly small as AC goes. Don't buy too big. Short run cycles
are less efficient. (It'll tell ya all about that on the site.)

Cheers,
Doug Pratt

-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com] 
Sent: Thursday, October 30, 2003 5:11 PM
To: New wrenches posting
Subject: Efficient room A/C info request [RE-wrenches]

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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