[Bldg-sim] EQUEST QUESTION

[Sasa Pantic]

Hello,
 
I would kindly ask for information please.
I am doing energy modeling for LEED EAc1 complinace in Energy Pro. It is a mixed use building (retail and residential). The HVAC system is as follows:  for RETAIL:  Unconditioned fresh air is supplied by roof mounted supply fan (SF) to the zone where  one portion is mixed with  indoor air and  introduced to the indoor unit of split electrically driven heat pump. The other portion of the fresh air is supplied around kitchen hood serving as an air curtain and exhaust is by kitchen hoods. For residential - electrical baseboard heaters only + natural ventilation. 
Corridors are not conditioned but just ventilated (fresh air supply + exhaust for each corridor per floor) 
My concerns are as follows….
 
1)  How to model retail HVAC system? One room is one zone.
My approach would be: 
@ system level/Split DX/Heating and Cooling capacity of outdoor unit/ Enter fan cfm and HP for outdoor unit as per cut sheet
@ zone level/ zonal system/select variable refrigerant flow (just to account for heating and cooling capacity), enter heating and cooling capacity of indoor unit / fan tab enter cfm from  fan cut sheet (mixed air)
@ room level/ exhaust fan tab/ enter cfm being exhausted (to account kitchen hoods)
 
How to model SF? Perhaps to include additional zone and room, where internal loads are zero, room is unconditioned with cfm and HP entered @ zone level?   
 
2) How to model electrical baseboard heaters? One room is one zone.
My approach would be: @ system level , select any system without heating/cooling. At zone level, select e.g. VAV box and put Heating Output only. 
 
3) How to model ventilation for corridors?. One zone includes corridors on several levels
My approach would be: 
@ system level: select any system without heating/cooling, no input for fan
@zone level/ select e.g. VAV box or diffuser/ enter air supply cfm  but without heating/cooling
@ room level/ exhaust fan tab/ enter cfm being exhausted 
 
 Thanks,Sasa
 
 
--- On Wed, 3/7/12, Chris <floodyc at gmail.com> wrote:


From: Chris <floodyc at gmail.com>
Subject: Re: [Bldg-sim] EQUEST QUESTION
To: "RobertWichert" <robert at wichert.org>
Cc: bldg-sim at lists.onebuilding.org
Date: Wednesday, March 7, 2012, 9:55 PM


I've always found the default plug & lighting loads in eQuest to be on the high-side which has a significant affect on space temperatures and space conditioning energy.


On Wed, Mar 7, 2012 at 12:27, RobertWichert <robert at wichert.org> wrote:

I am trying to learn E-Quest and I am trying to model a building that I have already modeled with Energy Pro.  The gas usage from E-Quest is very very low compared to both actual and Energy Pro.  It is a hot water reheat VAV system with a boiler and a water cooled condenser.  The actual gas use is 17891 Therms, from the bills.  Energy Pro predicts 17600 Therms.  E-Quest predicts 580 Therms.  This makes no sense to me, but it is clearly my error.  I have gone over the inputs several times.

Is there anything that occurs to anybody that would make gas usage that far off?

Electrical from E-Quest is 453 MWh.  Electrical from Energy Pro is 422 MWh.  Electrical actual is 543 MWh.  The building has lots of unaccounted-for process equipment, so I'm not so worried about being low on electrical.  It's not too far off.  But the gas use is just way too low.  Hot water is showing up at 3 Therms a month.


This is the first model I have done with E-Quest, so I apologize for even asking.  It's obviously something stupid that I have done.


-- 
Robert Wichert P.Eng. LEED AP
+1 916 966 9060
FAX +1 916 966 9068







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Chris Flood BSc (Eng)
Senior Building Analyst

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