Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
If you leave your circulation loop sizing as the default "secondary" then it adds up all of the maximum coil loads at full air flow with sizing factors as the loop capacity. This often leads to the significant oversizing you describe.
An alternative is to set the loop sizing to "primary". In that case it will use the combined capacity of the primary equipment as the loop capacity. This does force you to explicitly define the the boiler or chiller capacity.
