[EnergyPlus_Support] Room Air Modeling [2 Attachments]

["ryanwalterkennett@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Hi,

I'm modeling a tall facility (25 ft ceiling) using RoomAir:TemperaturePattern:NondimensionalHeight objects to simulate vertical stratification. These objects allow the thermostat temperature to float with the zone's average air temperature on a schedule (I have 24 temperature profiles defined over 1 year on a schedule). 

Based on plotting Output:Variable:ZoneAirTemperature and Output:Variable:ZoneThermostatAirTemperature, it is clear that the HVAC system is controlling the average air temperature when it should be controlling the thermostat air temperature (see attached pictures).

Is anybody familiar enough with room air modeling to understand this discrepancy? Perhaps the modeling is correct, and the output variables are simply not up to date with the room air models. 

Note: in the images, the thermostat air temperature varies so much because of a retrofit I'm studying. Why isn't the thermostat controlled at setpoint, 22.2 C, and the space temperature varied?

Best,

Ryan Kennett

University of Maryland

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Posted by: ryanwalterkennett@xxxxxxxxx

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