| Name | Vav_terminal_unoccupied_setback_energyplus |
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| Display Name | Vav Terminal Unoccupied Setback Energyplus |
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| uuid | e7f3a2b1-c948-4d6e-b05a-f2c1d3e4a567 |
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| Type | Measure |
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| Language | Ruby |
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| Tags | HVAC.HVAC Controls |
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| Description | For a selected thermal zone, applies unoccupied setbacks: (1) derives the
occupancy schedule via Space → Space Type → People, creates a modified
airflow turndown schedule, and assigns it to the zone's VAV terminal; (2)
finds the zone thermostat DualSetpoint, copies the heating and cooling
setpoint temperature schedules with setback temperatures substituted during
unoccupied periods; (3) finds the zone ZoneControl:Humidistat, copies the
humidifying and dehumidifying setpoint schedules with setback humidity
values substituted during unoccupied periods. Setting a setback value to 0
skips that setback entirely. The measure can be used to model ASHRAE 170
healthcare setbacks. |
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| Modeler's Description | EnergyPlus Measure: Occupancy is resolved from Space (Zone Name) → SpaceType
→ People → Number of People Schedule Name. The turndown schedule
(Schedule:Year or Schedule:Compact) is copied with occupied values → 1.0 and
unoccupied values → turndown_fraction. Temperature and humidity setback
copies are built by merging the occupancy day-interval breakpoints into each
setpoint Schedule:Day:Interval; unoccupied periods (occ ≤ 0.1) receive the
user-specified setback value. Different day types in the week schedule
receive distinct copies so each day type's occupancy pattern is correctly
reflected. New schedules are named '_Minimum Air Flow Turndown
Schedule', '__Setback'. Setting any setback
argument to 0 skips creation of that schedule. Humidity setback requires
ZoneControl:Humidistat. Warning: The measure will overwrite design day
schedules. If equipment is autosized, this may resize equipment capacities.
If this measure is being run on existing equipment it is recommended to
hardsize the equipment first. Implementing setbacks on existing equipment
not originally sized for setback may encounter shortages in capacity. |
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| Measure Function | Measure |
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| Requires EnergyPlus Results | false |
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| Uses SketchUp API | false |
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| Measure Type | EnergyPlusMeasure |
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| OpenStudio Version | 3.10.0 |
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| Minimum Compatible OpenStudio Version | 3.0.0 |
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| GitHub Repo Link | View on GitHub |
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