I am new to energy modeling and I am curious if there is a way to take credit for more efficient transformers in an energy model. Some of our transformer reps have said that there is not a LEED credit for more efficient transformers, but you have to gain the credit through the energy model. Would it just be through more heat in a space? I appreciate any information I can get in this matter.
Best Regards,
Jason Boehning, EIT
You can model transformer sizes and losses in the detailed edit mode when you open up you electric meter.
I have to confess I have not modeled a transformer in a model yet (the default is not to model a transformer and the loss associated). You can specify a loss part load curve too:
TRANS-LOSS-FPLR
Takes the U-name of a curve that gives the multiplier on TRANSFORMER-LOSS as a function of the part load ratio (current hour load on the meter divided by TRANSFORMER-SIZE). The transformer loss is calculated hourly as
(TRANSFORMER-SIZE) x (TRANSFORMER-LOSS) x (TRANS-LOSS-FPLR value)
The load is the sum of that due to all directly connected equipment and, for TYPE = UTILITY and BUILDING, other ELEC-METERs. The default curve is linear from 0.1 at zero load to 1.0 at full load.
Like I said I haven't done it yet - good luck. Let me know how it turns out
Vikram Sami, LEED AP
A transformer model will be added to the next version of EnergyPlus, which is expected to be released in October. That model can capture transformer energy losses and the interaction with the zone heat balance.
Thanks,
Weimin Wang
I should have mentioned I was referring to eQUEST...
Vikram Sami, LEED AP
On another lite--how are energy credit provided for solar domestic water
heating or PV?
Galen Rejda, LEED? AP BD+C:??