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

Aulbach, John JAulbach at semprasolutions.com
Mon Apr 7 15:31:42 PDT 2003


This looks like a better method. There would be no "master" zone, and the
system would be on either heating or cooling with reheat. And no worry from
killing the pumping.

Sounds like Michael has it !!

-----Original Message-----
From: Michael Wilson [mailto:mwilsonbc at yahoo.com]
Sent: Monday, April 07, 2003 3:28 PM
To: Aulbach, John; BLDG-SIM at GARD.COM
Cc: 'BLDG-SIM at gard.com'
Subject: Re: [BLDG-SIM] Modeling DX with reheat in VisualDOE/DOE-2


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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