EnergyPlus Displacement Ventilation Control Issue

asked 2018-05-25 12:48:20 -0500

mleach's avatar

updated 2018-05-29 11:59:53 -0500

I'm trying to model displacement ventilation. I'm setting the RoomAirModelType appropriately (OneNodeDisplacementVentilation, ThreeNodeDisplacementVentilation, etc.). My model has packacged single zone equipment with constant volume single zone reheat setpoint managers (supply temperature determined by cooling/heating load to setpoint). When I run I find that the HVAC system is controlling off of the Zone Air Temperature (which I believe represents the perfectly mixed condition, as opposed to the stratified condition) as opposed to the Zone Thermostat Air Temperature (which I believe correctly reflects the impact of stratification on temperature at thermostat height). The result is over-cooling in cooling mode (see plot). Is there a way to enable E+ to control to the thermostat temperature?

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@mleach did you ever figure this out? I think HVAC is always using the Zone Mean Air Temperature as the system control input, but I agree that it should work off the occupied zone temperature.

Eric Ringold's avatar Eric Ringold  ( 2019-11-11 18:39:14 -0500 )edit