Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Your design coil load already includes the 15% since it comes from the zone level. This is what should matter to USGBC.
The design coil load is what happens at the sizing peak load, with the actual inlet temperatures.
The Nominal Total Capacity, or rated total capacity, is what would happen at standard (rated) conditions. It's a way to do an apple-to-apple comparison, similar to what you'll find in manufacturers' catalog.
See page 1949/1987 of the I/O reference manual:
Equipment Summary
[...] - Cooling Coils includes the nominal total, sensible and latent capacities, the nominal sensible heat ratio, the nominal efficiency, nominal UA value, and nominal surface area for each cooling coil. These values are calculated by calling the cooling coil simulation routine with the rated inlet conditions: inlet air dry bulb temperature = 26.67C, inlet air wet bulb temperature = 19.44C, inlet chilled water temperature = 6.67C.
For more information about the simulation routine, refer to the coils sections in the engineering reference manual especially pages starting at 402/1304 and at 584/1304
| | 2 | No.2 Revision |
Your design coil load already includes the 15% since it comes from the zone level. This is what should matter to USGBC.
The design coil load is what happens at the sizing peak load, with the actual inlet temperatures.
The Nominal Total Capacity, or rated total capacity, is what would happen at standard (rated) conditions. It's a way to do an apple-to-apple comparison, similar to what you'll find in manufacturers' catalog.
See page 1949/1987 of the I/O reference manual:manual (v8.2):
Equipment Summary
[...] - Cooling Coils includes the nominal total, sensible and latent capacities, the nominal sensible heat ratio, the nominal efficiency, nominal UA value, and nominal surface area for each cooling coil. These values are calculated by calling the cooling coil simulation routine with the rated inlet conditions: inlet air dry bulb temperature = 26.67C, inlet air wet bulb temperature = 19.44C, inlet chilled water temperature = 6.67C.
For more information about the simulation routine, refer to the coils sections in the engineering reference manual especially pages starting at 402/1304 and at 584/1304
