I have been using EnergyPlus
to model the external energy input for large buildings. I try to keep
the model rather simple, and construct it
When I try to define my
report meters the choices are confusing and I don't always get the same
choices project to project.
This time I constructed a
110,000 square foot two story building with about 30% glazing. Just one
zone with the second floor not included in the model.
In any case. I set up an
output variable as "Outdoor Dry Bulb " . Here are a two of the
relevant output meters offered by EP that I ran just to compare
results. 1) District Cooling:Facility, 2) Cooling Energy
Question #1: For the
two meters I chose the results varied by 25! % or more when the cooling demand
was applied for just say 4 hours out of 24 or more during the winter.
Summer demand was vary consistent between the two meters. What I found
was that Cooling Energy Transfer:Zone:Building was greater than Cooling Energy
Transfer:Zone:Building when the two meters did not
Question #2: How do I
evaluate the choices between meters. Are there other meters that are not
shown when I make a selection? Other choices that were offered for this
project:1) Cooling Energy Transfer 2) District Cooling:HVAC 3)
Cooling"DistrictCooling, can you explain the differences?
William R Henry,
San Jose, CA