[bldg-sim] DOE2.1E - PVAVS main heating coil

[Chris Jones]

This is one of my favorite peeves with DOE2.1E.  in a VAVS or PVAVS the 
heating coil does not work if you specify COOL-CONTROL = WARMEST.  In 
practice an actual VAV system with a heating coil will maintain the minimum 
supply T.  This is not a problem in California where the code for the 
systems portion of DOE2.1E was developed.  If you set COOL-CONTROL = 
CONSTANT or COOL-CONTROL = RESET and define an outdoor temperature reset 
schedule then the heating coil works as expected.  I have not been able to 
convince anyone to fix the code for COOL-CONTROL = WARMEST and I have been 
trying for a number of years.

The work around is to define a PREHEAT-T at a couple of degrees below the 
MIN-SUPPLY-T.  There tends to be more heating and cooling with this work 
around than you would expect but it is better than using COOL-CONTROL = 
CONSTANT.

I wonder if this problem has been fixed in DOE2.2?


>In modeling a PVAVS system in DOE2.1E, I can't get the main heating coil to
>be recognized. I have entered a "HEAT-SET-T" (greater than the
>"MIN-SUPPLY-T") in "system control" and specified the heating coil capacity,
>however, the only heating I'm getting is from the baseboards. I've worked
>around this problem before by distributing my main coil capacity into the
>preheat, reheat and/or baseboard. Any opinions on the best work-around for
>this problem?
>
>James Campbell CEM, BEP
>Geo-Marine Inc.
>
>
>
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Chris Jones, P.Eng.
14 Oneida Avenue
Toronto, ON M5J2E3
Tel. 416 203-7465
Fax. 416 946-1005 


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