[bldg-sim] entering air temp for air-cooled condensers

[Jon Maxwell]

The Florida Solar Energy Center did three field tests with and without
shading for a residential split system and published the results in
1996.  See http://www.fsec.ucf.edu/bldg/pubs/pf302/.

In short, the authors conclude that "any savings produced by localized
AC condenser shading are quite modest (<3%) and that the risk of
interrupting air flow to the condenser may outweigh shading
considerations. The preferred strategy may be a long-term one:
locating AC condensers in an unobstructed location on the shaded north
side of buildings and depending on extensive site and
neighborhood-level landscaping to lower localized air temperatures."
The authors attributed the surprisingly small savings as being due to
the fact that the air flow volume greatly exceeds the shaded area
volume.

Jon Maxwell, PE
Aspen Systems

----- Original Message -----
From: "Alex B. Lekov" <ABLekov at lbl.gov>
To: <bldg-sim at gard.com>
Cc: <bldg-sim at gard.com>
Sent: Monday, October 28, 2002 2:43 PM
Subject: [bldg-sim] entering air temp for air-cooled condensers


This topic is discussed in the following paper:
"The Measured Impacts of Air Conditioner Condenser Shading", J.Stone,
D.Parker and S.Barkaszi, presented at 2002 ACEEE Summer study of
Energy
Efficiency in Buildings.

Hope this will help.

Alex Lekov

"Mottillo, Maria" wrote:
>
> Hi,
>
> I am looking for information on appropriate adjustments to entering
air
> temperatures for air-cooled condensers to take into account the
location of
> the condenser (for example, next to building and subject to solar
gains,
> etc.). Is any simulation program considering this, or using any such
> adjustment, or is it standard practice to use information directly
from the
> weather file (i.e. conditions at weather station).
>
> Any information on the method used by EnergyPlus and/or DOE-2 would
also be
> greatly appreciated (I had no luck finding the information in the
reference
> documentation).
>
> Thanks!
> Maria
>
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