[Bldg-sim] [BLDG-SIM] Increased R value Credit for Concrete and Thermal Massing

[Murray Milne]

Steve...

I agree with your comments... We have developed a couple of free 
design tools that might be of 
interest:  www.aud.ucla.edu/energy-design-tools  HEED (Home Energy 
Efficient Design) will show graphically the time lagged heat flow 
through each of the different building elements, including slab edge 
loss. The Thermal Mass screen lets you explicitly define the mass 
inside the insulated envelope. To see the plot of heat flow into and 
out of this mass you can run a 12-day analysis from the Climate 
screen. One of our other programs called OPAQUE will calculate the 
required time lag and decrement as well as U-factor of any wall section.

Murray Milne, Research Professor
UCLA,  Department of Architecture and Urban Design, Los Angeles, 90095