Hi,

I am having difficulty formulating a response to USGBC about the difference between the Design Coil Load (Btu/hr) and the Nominal Total Capacity (Btu/hr). They are questioning why the difference between the two isn't 15% as required by ASHRAE 90.1 Appendix G. I have over sized all zones by the 1.15 at the zone level like EnergyPlus allows however on this report the difference between the Design Coil Load (Btu/hr) and the Nominal Total Capacity (Btu/hr) is 20%. I found online that the design coil load is indeed the sensible load capacity so this could be the reason that there is a greater percentage than 15% between the two. However, there is not much information on this. I would like to know a bit more about how each of these parameters are calculated in the software. I cannot find much online about it.

Does anyone have some insight on the difference between the Design Coil Load (Btu/hr) and the Nominal Total Capacity (Btu/hr) reported in the Cooling Coils table on the Equipment Summary report? Or direct me to a reference where I can find such information?

Thank you in advance for your help.

Best regards
for KEMA Services Inc., USA

Celia King-Scott PE, BEMP, LEED(r) AP BD+C
Senior Engineer, Sustainable Buildings & Communities

E-mail celia.king-scott at dnvgl.com
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