I am trying to model a 10,000 sqft office building using OpenStudio. The building currently has an HVAC system (Packaged RTU VAV with reheat) running 24x7 and I want to understand energy savings by implementing a weekday(6am-8pm)/weekend(8am-6pm) schedule.
I ran the model, initially, using constant heating and cooling setpoints for all 7 zones throughout the day to simulate 24x7 HVAC operation, and later, used 'Replace Thermostat Schedules' measure from BCL where I replaced old schedules with revised weekday/weekend schedules for all thermal zones.
The EUI of the model dropped from 170 kBtu/sqft to 70 kBtu/sqft. I found the following warnings in the ERR file:
* Warning * SetUpZoneSizingArrays: Requested Sizing for Zone="THERMAL ZONE 2", Zone has no thermostat (ref: ZoneControl:Thermostat, et al)
* Warning * SetUpZoneSizingArrays: Requested Sizing for Zone="THERMAL ZONE 3", Zone has no thermostat (ref: ZoneControl:Thermostat, et al)
* Warning * SetUpZoneSizingArrays: Requested Sizing for Zone="THERMAL ZONE 4", Zone has no thermostat (ref: ZoneControl:Thermostat, et al)
* Warning * SetUpZoneSizingArrays: Requested Sizing for Zone="THERMAL ZONE 5", Zone has no thermostat (ref: ZoneControl:Thermostat, et al)
* Warning * SetUpZoneSizingArrays: Requested Sizing for Zone="THERMAL ZONE 6", Zone has no thermostat (ref: ZoneControl:Thermostat, et al)
* Warning * SetUpZoneSizingArrays: Requested Sizing for Zone="THERMAL ZONE 7", Zone has no thermostat (ref: ZoneControl:Thermostat, et al)
* Warning * Calculated design cooling load for zone=THERMAL ZONE 2 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design heating load for zone=THERMAL ZONE 2 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design cooling load for zone=THERMAL ZONE 3 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design heating load for zone=THERMAL ZONE 3 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design cooling load for zone=THERMAL ZONE 4 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design heating load for zone=THERMAL ZONE 4 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design cooling load for zone=THERMAL ZONE 5 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design heating load for zone=THERMAL ZONE 5 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design cooling load for zone=THERMAL ZONE 6 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design heating load for zone=THERMAL ZONE 6 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design cooling load for zone=THERMAL ZONE 7 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
* Warning * Calculated design heating load for zone=THERMAL ZONE 7 is zero. * ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.
I ran the same measure in a different model and got similar results and warnings. Is this a problem with the measure or am I missing something in the model? P.S. - There are no warnings for Thermal Zone 1
