[Equest-users] [equest-users]

[W. Peter Anderson]

Thanks, I will give this a try
  ----- Original Message ----- 
  From: Jon Evans 
  To: W. Peter Anderson ; equest-users at lists.onebuilding.org 
  Sent: Thursday, June 25, 2009 3:10 PM
  Subject: RE: [Equest-users] [equest-users]


  W. Peter,

   

  Check your zone airflows - if too low, it will take quite a bit of heat from the coil to change the space temperature. 1 cfm/SF of supply air is typical for many building types and spaces with standard ventilation requirements.

   

  Check your reheat deltaT - this delta plus your preheat coil in your air handler need to be higher than your space setpoint

   

  Check your zone supply air temperature - I think eQuest defaults to 95; I would bump this up to 105.

   

  If you have simplified the zoning of the building you may want to break these problem spaces up into smaller zones.

   

  You can also override your zone coil capacities, but should coordinate this with the mechanical designer to ensure that your modeling is realistic (for example you have simplified and combined several zones; make sure that the coil capacity is at least the summation of all these zones).

   

  Good luck.

   

  Jon Evans, PE, LEED AP

   

  Sustainable Engineering Group LLC

  431 Charmany Drive Suite 102

  Madison, WI 53719

   

  Tel: (608) 231 9664 x 13

  Fax: (608) 231 9665

  E-mail: jevans at sustaineng.com

  Web: www.sustaineng.com

   


------------------------------------------------------------------------------

  From: W. Peter Anderson [mailto:panderson at jpengineer.com] 
  Sent: Thursday, June 25, 2009 9:00 AM
  To: equest-users at lists.onebuilding.org
  Subject: [Equest-users] [equest-users]

   

  Greetings-

  I have set up PVAV systems with hot water coils.  I am getting error messages (See Below) for each of my systems.  On the LS-S reports, heating capacity for unit and zones is zero, but I do have hot water coils and a boiler loop, etc.

   

  See below, 

  Thansk,

  W. Peter Anderson, P.E
  JP Engineering
  41 Mechanic Street
  Windsor, CT 06095
  Ph: 860/688-5223
  Fax: 860/688-5269 

   

   

  **WARNING**********************************************************************

  ZONE EL1 NE Perim Zn (G.NE2) 

  might have insufficient heating capability.

  Check that the SYSTEM or ZONE HEATING-CAPACITY plus this

  ZONEs BASEBOARD-RATING is adequate to maintain the ZONE

  specified DESIGN-HEAT-T for the calculated peak ZONE load

  (see LS-A or LS-B for the ZONE peak load.)

  SYSTEM HVAC-1 

  which supplies the above listed ZONE, has a design heating

  coil exit temperature, HEAT-SET-T,(plus any zone reheat)

  below its MAX-SUPPLY-T or the ZONE DESIGN-HEAT-T, which

  might account for the insufficient heating capability.

  **WARNING**********************************************************************

  ZONE EL4 East Perim Zn (G.E2) 

  might have insufficient heating capability.

  Check that the SYSTEM or ZONE HEATING-CAPACITY plus this

  ZONEs BASEBOARD-RATING is adequate to maintain the ZONE

  specified DESIGN-HEAT-T for the calculated peak ZONE load

  (see LS-A or LS-B for the ZONE peak load.)

  SYSTEM HVAC-1 

  which supplies the above listed ZONE, has a design heating

  coil exit temperature, HEAT-SET-T,(plus any zone reheat)

  below its MAX-SUPPLY-T or the ZONE DESIGN-HEAT-T, which

  might account for the insufficient heating capability.

  **WARNING**********************************************************************

  PREHEAT/HEATING-CAPACITY in SYSTEM HVAC-1 

  is too low to provide the requested supply temperature for

  the calculated mixed air temperature using total ZONE loads

  (on LS-A/B) and SYSTEM design parameters, plus outside air

  conditions (on LS-C), and specified capacities & air flows.

  Requested temperature is 55.00 calculated is -3.14

  Check HEATING-CAPACITY, HEAT-SET-T, PRE-HEAT-T, MAX-SUPPLY-T,

  DESIGN-HEAT-T, and ZONE loads for consistency.

   
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