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

[Darryl Thayer]

To Allan
Also remember the capacity of batteries for your UPS
is strongly effected by the discharge time.  When
batteries are discharged as fast as from minutes to an
hour the AH is radically different from a three hour
discharge.  (As I reciently discovered)  

Another thought that I have had is to use a generator
to charge batteries and have the AC power supplied
from the inverters. 
Good luck 
Daryl
 
--- Doug Pratt <dmpratt at sbcglobal.net> wrote:
> 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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