modelPartialOpenLoop

Partial model with open loop system
Diagram of PartialOpenLoopOpen the diagram

Extends from Modelica.Icons.Example (Icon for runnable examples).

Information

This partial model implements the HVAC system model and a simple room, which is here modeled as a first order response. (More detailed room models are available in Buildings.ThermalZones, but for this tutorial it suffices to use this room model.) The control inputs are not connected as these will be connected in the tutorials that extend this model.

For instructions of how to build this model, see Buildings.Examples.Tutorial.Boiler

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.HeatFlowRateQ_flow_nominal20000Nominal heat flow rate of radiator
Modelica.Units.SI.TemperatureTRadSup_nominal273.15 + 50Radiator nominal supply water temperature
Modelica.Units.SI.TemperatureTRadRet_nominal273.15 + 40Radiator nominal return water temperature
Modelica.Units.SI.MassFlowRatemRad_flow_nominalQ_flow_nominal/4200/(TRadSup_nominal - TRadRet_nominal)Radiator nominal mass flow rate
Modelica.Units.SI.TemperatureTBoiSup_nominal273.15 + 70Boiler nominal supply water temperature
Modelica.Units.SI.TemperatureTBoiRet_min273.15 + 60Boiler minimum return water temperature
Modelica.Units.SI.MassFlowRatemBoi_flow_nominalQ_flow_nominal/4200/(TBoiSup_nominal - TBoiRet_min)Boiler nominal mass flow rate
Modelica.Units.SI.MassFlowRatemRadVal_flow_nominalQ_flow_nominal/4200/(TBoiSup_nominal - TRadRet_nominal)Radiator nominal mass flow rate
Modelica.Units.SI.VolumeV6*10*3Room volume
Modelica.Units.SI.MassFlowRatemA_flow_nominalV*1.2*6/3600Nominal mass flow rate
Modelica.Units.SI.HeatFlowRateQRooInt_flow4000Internal heat gains of the room

Connectors

TypeNameDefaultDescription
BoundaryConditions.WeatherData.BusweaBusWeather data bus

Components

TypeNameDefaultDescription
Buildings.Fluid.MixingVolumes.MixingVolumevolRoom air volume
Modelica.Thermal.HeatTransfer.Components.ThermalConductortheConThermal conductance with the ambient
Modelica.Thermal.HeatTransfer.Sources.PrescribedHeatFlowpreHeaPrescribed heat flow
Modelica.Thermal.HeatTransfer.Components.HeatCapacitorheaCapHeat capacity for furniture and walls
Buildings.Controls.OBC.CDL.Reals.Sources.TimeTabletimTabTime table for internal heat gain
Buildings.Fluid.HeatExchangers.Radiators.RadiatorEN442_2radRadiator
Buildings.Fluid.Sensors.TemperatureTwoPorttemSupSupply water temperature
Modelica.Thermal.HeatTransfer.Sensors.TemperatureSensortemRooRoom temperature
Buildings.Fluid.Movers.FlowControlled_m_flowpumRadPump for radiator
Buildings.Fluid.FixedResistances.JunctionmixMixer between valve and radiators
Buildings.Fluid.FixedResistances.JunctionsplSplitter of boiler loop bypass
Buildings.Fluid.FixedResistances.Junctionspl2Flow splitter in return from radiator
Buildings.Fluid.FixedResistances.Junctionmix2Mixer
Buildings.Fluid.FixedResistances.Junctionspl4Splitter for radiator loop valve bypass
Buildings.Fluid.Movers.FlowControlled_m_flowpumBoiPump for boiler
Buildings.Fluid.Boilers.BoilerPolynomialboiBoiler
Buildings.Fluid.Actuators.Valves.ThreeWayEqualPercentageLinearvalRadThree-way valve for radiator loop
Buildings.Fluid.Sources.Boundary_pTpreSouSource for pressure and to account for thermal expansion of water
Buildings.Fluid.Actuators.Valves.ThreeWayEqualPercentageLinearvalBoiThree-way valve for boiler
Buildings.Fluid.Sensors.TemperatureTwoPorttemRetReturn water temperature
Buildings.Fluid.FixedResistances.Junctionspl1Splitter
Modelica.Thermal.HeatTransfer.Sensors.TemperatureSensorsenTOutOutdoor temperature sensor
BoundaryConditions.WeatherData.ReaderTMY3weaDatWeather data reader
Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperatureTOutOutside temperature

Contents

NameDescription
MediumAMedium model for air
MediumWMedium model for water

Revisions

  • February 18, 2020, by Michael Wetter:
    First implementation.