Many Energy Modeling Programs Do Not Account for
Insulated Thermal Mass
DOE 2 and eQUEST are two popular energy modeling programs that
do not accurately differentiate between the values of different insulation
configurations in mass walls.
No rocket science required to figure out NRG's energy savings.
We take the actual utility bill energy usage figures from the buildings
we have up. We calculate how much it is per square ft. annually,
and compare those numbers with the Department of Energy
Commercial Buildings Energy Consumption Surveys.
We compare real world numbers to other real world numbers, and
get actual savings. Look for similar sized buildings in the same climate zone.
While no comparison is 100% accurate, this will give you an idea of the energy
savings.
In some cases, NRG block delivers HVAC energy savings of 60% or more.
The links are below:
http://www.eia.gov/emeu/cbecs/cbecs2003/detailed_tables_2003/2003set11/2003pdf/c27.pdf
http://www.eia.doe.gov/emeu/cbecs/cbecs2003/detailed_tables_2003/2003set19/2003pdf/e02.pdf
http://www.eia.doe.gov/emeu/cbecs/cbecs2003/detailed_tables_2003/2003set9/2003pdf/c4.pdf
LEED requires a projected energy model for each individual building. Just make
sure that the energy modeling program you use accurately accounts for insulated
thermal mass.
The performance differences between NRG and conventional wall systems should
approximate those found in the Oak Ridge National Lab report:
Dynamic Thermal Performance and Energy Benefits of Using Massive Walls in
Residential Buildings:
http://www.ornl.gov/sci/roofs+walls/research/detailed_papers/dyn_perf/index.html
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