[BLDG-SIM] supply air temp. reset in PowerDOE

[Fred Porter]

I think the "easy" way is to spec a constant 48F SAT, and use the
COOLING-SCHEDULE in the system or syscontrol to refer to a schedule
with a value of 65F, thus turning off the coil in the modeled AHU,
below that temp. But check the SAT with the hourly report before you
take my word for it.

Alec Stevens wrote:

> I am trying to model the following sequence of supply air
> temperature vs. outside air drybulb temp. in PowerDOE. 1) Drybulb
> above 65F -> Supply temp fixed at 48 F with mechanical cooling2)
> Drybulb between 48 and 65 F -> 100% OA, no cooling, so supply temp
> varies between 48-65 (not including fan delta T, etc)3) Drybulb
> below 48 F -> Supply temp fixed at 48 F with economizer cooling
> only, OA dampers modulate to provide correct supply temp. The 65F
> setpoint may be lowered if room temps get too high. I have been able
> to specify reset control of the supply temperature, but I think that
> this strategy will require at least two reset schedules, or a
> combination of reset and correct specs in the OA economizer
> section. Any ideas? Thanks.
> Sincerely, Alec Stevens
> DMI
> 617-527-1525x105
>
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--
Fred W. Porter
Senior Engineer
Architectural Energy Corp.
2540 Frontier Ave. Suite 201
Boulder CO 80301
email: fporter at archenergy.com
phone: 303-444-4149
fax: 303-444-4304


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