Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The "Design Size Nominal Capacity" outputs are the result of auto-sizing, where EnergyPlus uses parameters specific for the design day separately from the annual simulation. These parameters are defined across multiple objects, including:
I would start by checking the inputs of these objects. If those look alright, then check your heating thermostat schedule of temperature values. There are separate schedule profiles to define for the summer design day, winter design day, and annual simulation (run period). In OpenStudio, these are defined in the Schedules model data tab on the left. 
If the thermostat schedules look OK, then examine the summer and winter design day profiles for your other schedules (equipment, occupants, lights, etc.).
Finally, consider the differences in the placement (core vs perimeter, north vs south, etc.), internal gains (equipment, occupants, lights), and floor areas between your conditioned spaces to explain these differences in auto-sized heating coil capacity.
Are Coils 1 - 7 part of air terminals connected to central systems?
| | 2 | No.2 Revision |
It looks like you specified 1,000W or 2,000W for heating capacity in OpenStudio. Where did these values come from? Is this an existing building?
Are Coils 1 - 7 part of air terminals connected to central systems, or zone-level equipment like the PTAC?
The "Design Size Nominal Capacity" outputs are the result of auto-sizing, where EnergyPlus uses parameters specific for the design day separately from the annual simulation. These parameters are defined across multiple objects, including:
I would start by checking the inputs of these objects. If those look alright, then check your heating thermostat schedule of temperature values. There are separate schedule profiles to define for the summer design day, winter design day, and annual simulation (run period). In OpenStudio, these are defined in the Schedules model data tab on the left.
If the thermostat schedules look OK, then examine the summer and winter design day profiles for your other schedules (equipment, occupants, lights, etc.).
Finally, consider the differences in the placement (core vs perimeter, north vs south, etc.), internal gains (equipment, occupants, lights), and floor areas between your conditioned spaces to explain these differences in auto-sized heating coil capacity.
Are Coils 1 - 7 part of air terminals connected to central systems?
