[bldg-sim] Fan energy and cooling energy for VAV system

[Graham & Megan]

If you use the design day routines that use the design day schedules for
internal loads then you can get reasonable airside design values, but they
do need to be reviewed.

If you have a design to work from then check your models CFM/SQFT by zone to
the design and adjust sizing ratios to match the design; if the sizing
ratios are greater than 1.2 then you need to start asking yourself questions
on why the two sets of figures are that different ...

Allowing DOE-2.2/EQuest to then autosize on parametric runs that may be
varying internal loads, envelope performance, shading, design temperatures
etc will give reasonable relative results for energy use and peak loads.
The key is in getting the base case model to be representative of the
building and well behaved and then reasonable results should follow.

Regards,
Graham
----- Original Message ----- 
From: "John Aulbach" <jra_sac at yahoo.com>
To: <bldg-sim at gard.com>
Sent: Friday, November 18, 2005 6:57 PM
Subject: [bldg-sim] Fan energy and cooling energy for VAV system


> Dear Martin:
>
> I NEVER let DOE-2.1e or eQuest size my airflow. The
> sizing program ALWAYS seems to under-size the fan,
> based on the max space load conditions, which may or
> may not represent ASHRAE design airflow conditions.
>
> Stick with the Design sizing fans and fly with those.
> You still may have the opportunity to use variable
> volume to reduce airflows (and thus energy) during
> many hours of the year.
>
> But DON'T use DOE-2 or eQuest to size this stuff. My experience.
>
>
>
>
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