Forum discussion
NC-2009 EAc5: Measurement and Verification
Hi Chris,
Option B is based on adding submeters and isolate the energy use, while Option D is based on simulation. But as you learn more about Option D, it appears that it also needs for submeters.
My question is if submeters will be needed for both, what's the differnce between the two? I know option D involves the simulation, but if submitters will be still needed, why do we choose Option d over Option B?
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Is the gas consumption of stoves, ovens, etc. required under this point?
When should a project consider Option B instead of Option D?
Is there a requirement to model baseline energy use as being 25% process loads?
Does this credit specify how energy use should be measured?
Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
963 thumbs up
January 27, 2010 - 10:03 am
Option B looks at individual energy efficiency measures (EEMs) in isolation. Option D looks at the whole building. Option B is better for retrofits, where perhaps only a few EEMs have been implemented. Option D is usually better for a new building, where many of the EEMs might interact.
Many EEMs interact. What does that mean? Let's look at an example.
If I reduce the lighting power density in my project, I save electricity that would otherwise be used by the lights. But because lights also emit heat, I also affect my heating and cooling loads. To understand the full impact, I need to look at all these loads. Option D is really the only way to fully assess the performance of an "interactive" EEM.