I'm working on a SketchUp model with OpenStudio.
The model includes: - Heating loop with electric boiler and water baseboard; - Cooling loop with electric chiller and cooling coil in HVAC loop; - Somes electric preheat coil, VAV reheat, electric baseboard, PTAC and DX cooling coil.
The objective is to compare the loads from:
- Heating (2208 MBtu) and Cooling (1001 MBtu) annual loads from HVAC Load Profiles from OpenStudio Report to:
- Sum of heating equipement + Boiler load (efficiency = 1) (heating coil loop)
- Sum of cooling equipement + Chiller load (COP = 6.5) (Cooling coil loop) trying to compare
I noted that annual heating load (2208 MBtu) equal to Boiler load (1155 MBtu) + heating equipement exluding heating coil (1054 MBtu).
The problem is for the cooling load. Annual cooling load (1001 MBtu) dot not equal to Chiller load (959 MBtu) + cooling equipement exlucing cooling coil (324 MBtu).
What can explain this disparity?