Cooling load spikes while testing pre-cool using DoE Prototype High-rise Apartment
Hello,
I am using the DoE High-Rise Apartment Prototype building model to test a pre-cooling strategy and explore how much load can be shifted. I have access to whole-building master meter data from a real-life, older multifamily building. My goal is to calibrate the DoE model with this measured data and then test a pre-cool thermostat setpoint control (single cooling). Below is the schedule I implemented in the simulation.
SCHEDULE:COMPACT,
PRECLG_CLGSETP_APT_SCH, !- Name
Temperature, !- Schedule Type Limits Name
THROUGH: 12/31, !- Field 1
For: Weekday SummerDesignDay, !- Field 2
Until: 13:00, !- Field 3
23.89, !- Field 4
Until: 15:00, !- Field 5
22.22, !- Field 6
Until: 19:00, !- Field 7
25.56, !- Field 8
Until: 24:00, !- Field 9
23.89, !- Field 10
For: Weekend AllOtherDays, !- Field 11
UNTIL: 24:00, !- Field 12
23.89; !- Field 13
However, I am having a problem. The HVAC system meter output shows significant spikes at 15:00 when pre-cooling starts and at 19:00 when the ride-through period ends. In the actual building, the maximum chiller electrical load is around 220 kW with COP around 6.5. Although I have limited the chiller capacity in the IDF file, I would prefer that the zone temperature not meeting the pre-cooling setpoint rather than surpass the chiller's capacity.
Below is a screenshot of the simulation results.
I have tried to limit the following parameters regarding HVAC system capacity:
Coil:Cooling:WaterToAirHeatPump:EquationFit
!- Gross Rated Total Cooling Capacity
!- Gross Rated Sensible Cooling Capacity
PlantEquipmentOperation:CoolingLoad,
WSHPPlant Cool Operation Scheme, !- Name
!- Load Range 1 Lower Limit
!- Load Range 1 Upper Limit
WSHPPlant Cooling Equipment; !- Range 1 Equipment List Name
EvaporativeFluidCooler:SingleSpeed,
Central Tower, !- Name
!- Standard Design Capacity
I would appreciate any insights or suggestions on how to resolve this issue. Specifically, how can I avoid such large spikes in load while maintaining reasonable zone temperatures without exceeding the chiller capacity?
Thank you! I appreciate your time.