Asking again - Error in the BCL measure - Replace Thermostat Schedule ?

asked 2018-04-05 15:34:16 -0500

hnagda gravatar image

updated 2018-04-05 15:59:31 -0500

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 heating and cooling 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)......and so on (for zones 5,6 & 7)

  • 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.....and so on (for zones 4,5,6 & 7)

I understand that the measure is deleting the thermostats in all thermal zones except zone 1. 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 here?. If it's a measure problem, is there a way to report it on BCL and can someone please fix this?

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Comments

@hnagda Do your new thermostat schedules have winter and summer design day profiles for use with auto sizing? I'm not sure if that would produce this warning, but it is a good thing to check anyway

David Goldwasser gravatar imageDavid Goldwasser ( 2018-04-06 12:15:11 -0500 )edit

Thank you for the reply. Yes, the new thermostat schedules do have winter and summer design day profiles.

hnagda gravatar imagehnagda ( 2018-04-06 12:30:42 -0500 )edit