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

[hamnmegs at ozemail.com.au]

In 2.2 you can specify HEAT-CONTROL = COLDEST (in addition to HEAT-SET-T) which I believe will give you what you want.  Main heating coil will temper air to the point where it can still cool the warmest zone and then trim heaters / reheaters / baseboards will do the rest.  It's een a while since I worked with 2.1E so not sure if same control is available.
Regards,
Graham
> 
> From: Chris Jones <cj at cr-jay.ca>
> Date: 15/01/2005 5:08:42
> To: <bldg-sim at gard.com>
> Subject: [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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