[Bldg-sim] PVAVS System In Equest - 15, 000 hours out side of throttle range

[James Geers]

I believe that was the problem, I had left it blank assuming it would go to
a default value.  Thank you, I wish I would have figured that out a few days
ago.

 

JG

 

  _____  

From: Andrew Craig [mailto:AndrewC at InterfaceEng.Com] 
Sent: Friday, December 12, 2008 11:20 AM
To: James Geers; bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] PVAVS System In Equest - 15,000 hours out side of
throttle range

 

Do you have a value entered at the system level for Reheat Delta T?  This is
a pretty easy one to miss that will prevent your system from having any
reheat and can result in very high hours out of range.  

 



 

Please note my new e-mail address: andrewc at interfaceeng.com

Andrew Craig, EIT,LEED AP/ Mechanical Designer/ Energy Analyst
INTERFACE ENGINEERING 
direct 503.382.2696 

  _____  

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James Geers
Sent: Friday, December 12, 2008 6:31 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] PVAVS System In Equest - 15,000 hours out side of
throttle range

 

I am an Architect doing the energy model for a number of two story schools
over 85,000 SF, and using eQuest for LEED  energy design and documentation.

 

I am doing the energy model for LEED compliance and I am modeling the base
case with a Packaged Rooftop Variable Air Volume System to compare with my
VAV system for the design case.  I reverse engineered my design case to
modify the mechanical system, but all of  the simulations indicate I have
15,000 hours outside of the throttle range.  My hotwater loop has two
boilers and my heating coils are assigned to the loop, but there does not
seem to be any output from the system.  The system report summary indicates
that it is not serving any square footage, so I think there is a bug
somewhere. I have fiddled with the THROTTLE RANGE, HEAT-CONTROL,
COOL-CONTROL, HEAT-SET-T,  and MIN-SUPPLY-T after reading various posts but
nothing changes the lack of heat.  I've also fiddled with baseboard heat and
pre-heat but nothing seems to affect the hours outside of throttle range.
Does anyone have any suggestions?

 

JG

 

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