[Bldg-sim] 90.1 Appendix G heating with no cooling on Trace 700

[James V. Dirkes II P.E.]

Dear Nick,
 
I think past discussion on this list agreed that you can model a cooling
system which has very high setpoints.  I recall (though you'll have to check
past threads) that there may even have been a CIR which acknowledged this as
legitimate.
 
Regardless, the practice fulfills the "spirit" of the ASHRAE standard and
LEED.  You want to create a faithful model that predicts something
realistic.  A 95F stat does the trick (in my opinion)
 

The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

 

  _____  

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Nick Anderson
Sent: Monday, January 05, 2009 4:25 PM
To: Robby Oylear; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] 90.1 Appendix G heating with no cooling on Trace 700



The building is 1.5 million square feet, so 90.1 requires chilled water for
the cooling system.  

 

"Also, you can change your cooling schedule to something unreasonably high
like 95 degrees, then the cooling should never come on.  As far as I know,
this is a legitimate as ASHRAE and LEED do not mandate what temperatures
should be used."

 

I had tried setting the cooling coils to zero capacity and also setting the
T-stat so that no cooling was required.  But then it comes up with no
heating system airflow because it uses the cooling system as a basis for
heating system airflow calculations.

 

Good thought though.

 

Nick Anderson

 

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