our previous version of the baseline model in a C&S building had the same ventilation rates than the proposed. But, we were advised by the reviewer to change it in the zone with a ventilation demand control and model the ventilation rates as the ashrae minimum rates.
We find out that these values are much lower than the ones we have in the proposed studio, and we lose 4 points (due to % savings reduction). It is hard to see that installing a control demand system is worst than a normal system.
What do you think? Maybe is there something wrong? It can be possible due to different regulations (spain vs usa)? What can we do to reflect the benefits of the demand control?
Thank you in advance and sunny regards.
Marcus ShefferLEED Fellow
7group / Energy Opportunities
5752 thumbs up
September 24, 2014 - 2:43 pm
You are accounting for the benefits of DCV if you are modeling it correctly. You are paying a penalty for significantly over-sizing the ventilation relative to AHSRAE 62.1-2007 which is why the savings went down.