modelOneZoneConstantFloorTemperature

Validation model with one thermal zone with constant floor temperature
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Extends from Buildings.ThermalZones.EnergyPlus_24_2_0.Examples.SingleFamilyHouse.Unconditioned (Example model with one unconditoned zone simulated in Modelica, and the other two unconditioned zones simulated in EnergyPlus).

Information

Model that uses EnergyPlus and sets the floor temperature to a constant value.

When simulated, the heat flow rate at the floor is often around 10..20 Watts. However, it becomes negative when the direct solar irradiation is high, indicating that the net heat flow rate is from the room into the construction due to the solar gains that hit the floor even though the surface temperature is above the room air and room radiative temperature.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.VolumeVRoo (from Unconditioned)453.1Room volume
Modelica.Units.SI.MassFlowRatem_flow_nominal (from Unconditioned)VRoo*1.2*0.3/3600Nominal mass flow rate

Components

TypeNameDefaultDescription
Buildings.ThermalZones.EnergyPlus_24_2_0.Buildingbuilding (from Unconditioned)Building model
Buildings.ThermalZones.EnergyPlus_24_2_0.ThermalZonezon (from Unconditioned)Thermal zone
Buildings.Fluid.FixedResistances.PressureDropduc (from Unconditioned)Duct resistance (to decouple room and outside pressure)
Buildings.Fluid.Sources.MassFlowSource_WeatherDatabou (from Unconditioned)Boundary condition
Buildings.Fluid.Sources.Boundary_pTfreshAir (from Unconditioned)Boundary condition
Modelica.Blocks.Sources.Constant[3]qIntGai (from Unconditioned)Internal heat gains, set to zero because these are modeled in EnergyPlus
Buildings.ThermalZones.EnergyPlus_24_2_0.ZoneSurfacefloFloor surface of living room
Buildings.Controls.OBC.CDL.Reals.Sources.ConstantTFloFloor temperature

Revisions

  • March 12, 2021, by Michael Wetter:
    First implementation.