If same Lighting Power Density (W/sf) was used in all zones during the design phase using Building Type Method, should we switch to space by space on its final stage?
Appendix-G says it doesn't have to be an specific method, as long as the method is the same on both models but I just want to make sure that keeping the previous method will not cause any problem.
It would take more time to do the take-off for the proposed lighting design and resizing the whole HVAC system in the baseline if I switch to LPD space-by-space method. I hope you guys understand that sometimes we need to pick the option where we could save time.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
March 16, 2012 - 9:58 am
The change is up to you. Either method is acceptable. If you change the method you used from the preliminary to the final review just explain that you did and provide the information requested in Table 1.4.5.
In our experience most projects increase their savings by using the space-by-space method and it creates a more accurate model.
We all have to deal with time/budget when preparing models. The question we ask ourselves is one of time versus effect. Spending a lot of time on something with little effect makes no sense. Changing this method can make a big difference but not always.