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

[Andrew Craig]

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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