[BLDG-SIM] eQUEST-System no heating

Zhen Tian tianzhen9 at yahoo.com
Wed Aug 22 12:09:18 PDT 2007


Hi Aulbach,
   
  Thanks for your reply. Yes, I inpu everything into the detail mode. Based on the system design in climate. The air system has three typies of heating: 1) preheating for preheating the incoming air to around 5 degree C; 2) main system heating coil to heat the incoming air (this heat coil is arranged after cooling coil); 3) reheat coil, this is the reheat coil in zone level to meet the zone temperature requirement.
   
  The one I found is the 2) main system heating coil never works. In the model, the preheating coil was ignored. Seems that all heating load goes to the zone level reheat coil.
   
  Any idea about this?
   
  Thanks.
   
  Regards,
   
  David  
  

"Aulbach, John" <jaulbach at nexant.com> wrote:
      I am going to take a stab at this one. In eQuest, a VAV system is a Terminal System. Therefore, in the Wizard, the zone level is where all heating and/or reheating is done (and developed). You have to force a primary heating source to occur, but this doesn't appear in the Wizard mode, apparently..
   
  Have you input a Reheat-Delta-T? The temperature of 55 DegF + 40 DegF = 95 DegF heating supply temp.
   
  I also do NOT find the ability to create a pre heat coil in the Wizard. I have done it, but am quite sure this was input in the Detailed Interface Mode. There are MANY eQuest features that become available (like more SYSTEM-TYPES) in the Detailed Mode.
   
  Once you have "cookie cuttered" your building in the Wizards, switch to the Detailed Mode. There you will find your preheat coil.

    
---------------------------------
  From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Zhen Tian
Sent: Wednesday, August 22, 2007 9:49 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] eQUEST-System no heating


  
  Dear All,
   
  I experienced an issue when I use eQUEST. I model a building in cold climate with VAV system. In the wizard mode, I found the system heat source is "not installed". But when I change to electricity, I found the heating enery use for system heating is zero. I also tried other options, always found that the system heat source is useless. I found that all the heating goes the zone level. Based on my understanding, this should not be the real case.
   
  I set the air supply temperature as constant as 55F (around 13 degree C), zone entering max air tem as 95F. Enen I set the zone entering max air tem as 86 (30 C). The system heating coil still has no load.
   
  Has anyone experience the same problem before and know to to solve this problem?
   
  Thanks a lot.
   
  Regards,
   
  David
    
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