[Bldg-sim] eQUEST Slab-on-grade floor definition for compliance with ASHRAE 90.1-2004

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Dear all,

I have a question about how to define the slab-on-grade floors in eQUEST for compliance with ASHRAE 90.1-2004. In ASHRAE90.1-2004 page 29, the F-facror for unheated slab-on-grade floor is 0.73 and page 101 shows that there is no insulation for these floors.

To define the ASHRAE base case for LEED, I need to set up the model in eQUEST, in the wizard mode, I define the floor as "earth contact" and there is no insulation. When I went into the detail mode, I found eQUEST program automatically setup two additional layers for the slab-on-grade floors construction: UFMat R=20.886 and Light soil 12 inch. The U-value of the the floors is about 0.042. When I change the concrete layer thickness, there is no change in the U-value.

Could someone tell is this definition correct for compliance with ASHRAE requirement?

Thanks a lot.



Zhen Tian's picture
Joined: 2011-10-02
Reputation: 0

Say I'm simulating a water-to-air heat pump and using PSZ to get energy
recovery. Since the DOAS is nowhere to be found, is it kosher to total the
energy recovered with the cooling coil energy. Place this value in the
total cooling capacity and then set the cooling eir to nil.

It's been done before, right? Since I already have supply delta T at 0.01
and the throttling range at 10 why not right?

USGBC shouldn't have a problem with this right?

Kevin Kyte, LEED AP

Kevin Kyte's picture
Joined: 2011-09-30
Reputation: 0