Pump energy too low with four pipe fan coil system
I am modeling a 50,000 sqft, 3 story office building in a hot and dry climate (Central valley, California). The building is currently set up with 3 thermal zones; one per floor. I am using a four pipe fan coil system with constant speed pumps for heating and cooling. The model runs well with no errors, and both heating and cooling setpoint temperatures are met throughout the year.
When I run the model, the HVAC energy is distributed as follows: cooling: 82%, heating: 12%, fans: 5%, pumps: 2%. Upon closer inspection of the hour-by-hour zone temperatures, setpoint temperatures, and chiller energy consumption, I can see that the chiller operates nearly continuously (even after the setpoint temperatures have been met). Additionally, the absolute value of fan and pumping energy is far below typical benchmark numbers for this building type and climate zone. Any thoughts here?
Do you check fan pressure rise parameter ? Is that correct number ?