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

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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