I designed a building with radiant floor cooling. For LEED 2.2, EA Credit
1 -Optimize Energy Performance, in the submittal I used the Exceptional
Calculation Method to calculate the energy savings associated with the
radiant cooling. The energy savings were determined from the BTU/HR the
radiant floor manufacturer advised would be saved, and associated reduced
chiller load.

In response to the LEED submittal the USGBC reviewer stated, "This system
should be modeled in the proposed building and should not be submitted as
an exceptional calculation. Assuming Trace cannot model radiant cooling
directly, there are several possible workarounds that could be used to
simulate the performance of this type of system that have been posted on
the Bldg-Sim forum for energy modelers."

I reviewed the Lists Onebuilding Bldg-Sim as well as the Trace-Users
forums; I did not find a thread on how to model radiant floor cooling
savings in either forum. Could someone please tell me how to model energy
savings from radiant floor cooling in Trace?

Thank you

Phil Grossman P.E., LEED AP, HFDP