[BLDG-SIM] System Type in Appendix G

I expect the change was made in order to encourage the selection of more efficient system types for various buildings. With the energy cost budget method, buildings that select inherently efficient system types are not credited for this selection because the Baseline case moves with the Proposed case. Similarly, buildings that select inherently inefficient system types are not penalized for this selection. Appendix G attempts to correct this by

On 12/12/06, Bill Talbert <btalbert@xxxxxxxxxx> wrote:

All,

I'm working on a LEED energy analysis for a small healthcare clinic project (~15K sqft). According to A90.1-2004 Appendix G, Table G3.1.1A, the baseline HVAC system for a nonresidential building with <=3 floors, <75K sqft, and fossil fuel heating should be a packaged single zone system with DX cooling and a gas-fired furnace for heating. This seems like a big departure from the baseline system types indicated in the ECB method. Is this a correct interpretation? If so, can anyone provide feedback as to why this change was made? It seems as though many buildings of this size would utilize a packaged rooftop VAV. Also, it potentially makes the number of systems necessary in the baseline building significantly high unless the thermal blocks are simplified in the proposed design model.

Thanks,

Bill Talbert, LEED AP
Mechanical Engineer
Phone: (608) 441-6677
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