modelGuideline36Winter_Autosizing

Information

Same example as Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SmallOffice.Guideline36Winter, except that the HVAC system is sized using the autosizing feature in Spawn. The autosizing feature is used as follows:

• Zone level heating and cooling nominal air flowrates for each VAV box are sized using the autosized zone level design sensible heating and cooling loads and design heating and cooling temperature set points.
• Zone level minimum outside air flowrates are specified using the autosized zone level design minimum outside air flowrates.
• AHU nominal air flowrate is specified using the autosized system level design sensible cooling load as well as an assumed average of the zone cooling temperature set points.
• AHU minimum outside air flowrate is specified using the autosized system level design minimum outside air flowrate.
• AHU cooling coil nominal capacity is calculated as the sum the design system level sensible and latent loads. The sensible/latent load is calculated using a design mixed air temperature/humidity ratio determined using mixing box mass and energy balance that makes use of the autosized system level cooling design outside air temperature/humidity ratio and minimum outside air flowrate, along with the determined AHU nominal air flowrate and the assumed average of the zone cooling temperature/humidity ratio set points.

Parameters

Components

Revisions

• July 22, 2026, by David Blum:
  First implementation