[BLDG-SIM] Modeling DX with reheat in VisualDOE/DOE-2

Michael Wilson mwilsonbc at yahoo.com
Mon Apr 7 15:28:25 PDT 2003


You might also try using a packaged VAV (PVAVS) system
and setting the central heating capacity to zero (or
very small), and the box minimums to 100% so it acts
like a constant volume system. Then you should get DX
cooling and reheat heating.


--- "Aulbach, John" <JAulbach at semprasolutions.com>
wrote:
> As a long time DOE-2 user, I would go with the
> Constant Volume Reheat, make
> the chiller an air cooled DX, and kill the hot water
> and chilled water
> pumps. As you appear to be running Visual DOE, you
> do not have the "fancy"
> version of DOE-2.1E to actually put in kW/GPM for
> hot and chilled water
> pumps. You need to keep the pseudo-chilled water
> flow going to the the
> chiller (else the chiller will not operate). The
> fact you have electric heat
> negates any problems with the hot water pump.
>  
> Try something like 100% loss or 0% motor efficiency
> to remove any pump kW.
>  
> Hope it works. Have BLDG-SIMs other "wise"
> emissaries input at well.
> 
> -----Original Message-----
> From: John M. Topmiller [mailto:jmt at abacus-engr.com]
> Sent: Monday, April 07, 2003 5:42 AM
> To: BLDG-SIM at gard.com
> Subject: [BLDG-SIM] Modeling DX with reheat in
> VisualDOE/DOE-2
> 
> 
> 
> I have a fairly simple system in a building that I
> am modeling but I'm not
> sure the best DOE-2 system to use.  The building is
> served by one air
> handler in the middle of the building with DX
> cooling and no heating at the
> unit level.  Each of the two sides of the building
> has electric resistance
> reheats in the ducts; I'd figure I'd model the
> building with two zones each
> with 50 kW reheat.  I considered modeling the system
> as Packaged Single Zone
> AC with Heating and Subzone Reheating, however, with
> this system the heating
> in the control zone comes from the air handler and
> only the subzones have
> reheat capabilities.  With this system I'd have to
> set up a dummy control
> zone to truly model the building.  The system also
> is close to the
> Constant-Volume Reheat Fan System in the DOE-2
> manual, but I have DX cooling
> and not a chiller and cooling coil system.  With
> this system I'd have to
> convert the cooling loads of the chiller to that of
> a DX system.  
> 
> Does anyone have any experience with this type of
> system and know the best
> way to proceed? 
> 
> Thanks, 
> 
> John M. Topmiller, CEM 
> Energy Engineer 
> Abacus Engineered Systems 
> 4431 North Front St., Suite 100
> Harrisburg, PA 17110-1709 
> p: (717) 232-8182 ext. 239 
> c: (717) 514-9767
> f: (717) 232-8187 
>  <mailto:jmt at abacus-engr.com> jmt at abacus-engr.com 
> 
>  <http://www.abacus-engr.com> www.abacus-engr.com 
> 
> 
> 
>
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=====
Michael Wilson
455 Elphinstone Ave.
Gibsons, BC, V0N 1V1
604-886-9864 phone
604-676-2604 fax

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