Question-and-Answer Resource for the Building Energy Modeling Community
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Hi Oscar, I'm not familiar with equest, so this may not be very helpful, but for E+ the supply flow autosizing works like this:
The routine starts at the Sizing:Zone object, where you can specify zone_cooling_design_supply_air_temperature. With this parameter E+ is then calculating the air flow rate needed (at the given cooling design SAT and humidity ratio) to satisfy the specified zone loads (to meet your design thermostat setpoint). So your general control points are the temperature and humidity (to calculate enthalpy) of air being supplied to the zones (maybe this is DESIGN-COOL-T?), the thermostat design setpoint and the loads of each zone. SummerDesignDay temperature and humidity also play a factor (from the SizingPeriod:DesignDay object), as well as location, since those influence your zone loads as well. Zone level flow is calculated on a per zone basis, and then those are all summed up by air system to get the system level flow rate.
Hopefully that translates in a meaningful way to equest. Maybe there is a section in the equest documentation that digs into this routine as well.
