modelBasic

Example implementation of flow system

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

Information

Example model demonstrating the use of the Annex60 components in a larger system. This model is extended in Annex60.Fluid.Examples.FlowSystem.Simplified1, Annex60.Fluid.Examples.FlowSystem.Simplified2, Annex60.Fluid.Examples.FlowSystem.Simplified3. In these examples, the flow network is simplified in three steps, which reduces the size of algebraic loops.

The system model is for a hydronic system with a hot and cold water production device, each having its own circulation pump. The warm and cold supply water temperatures are selected by switching the bottom two-way valves. The building consists of a west and east wing. Each wing has multiple zones that are heated or cooled using the hydronic system. Each wing has a north and south section with a different supply temperature, which is controlled using two main three way valves. In total there are therefore four supply pipes, which are each connected to four or eight emission devices in the zones. The flow through the emission devices is controlled using two way valves. The emission device itself also generates a pressure drop, represented by components tabsX. Note that the emission devices are in the real building cooling and heating concrete slabs, but this simplified example only models their flow resistance. The control model consists of dummy inputs.

Components

TypeNameDefaultDescription
Annex60.Fluid.Movers.FlowControlled_dppmpSouthPump to south of building
Annex60.Fluid.FixedResistances.PressureDroppipSouth1Pipe 1 to south of building
Annex60.Fluid.FixedResistances.PressureDroppipSouth2Pipe 2 to south of building
Annex60.Fluid.Movers.FlowControlled_dppmpNorthPump to north of building
Annex60.Fluid.FixedResistances.PressureDroppipNorth2Pipe 2 to north of building
Annex60.Fluid.FixedResistances.PressureDroppipNorth1Pipe 1 to north of building
Annex60.Fluid.Actuators.Valves.TwoWayLinearvalSouth1Valves on souther tabs section 1
Annex60.Fluid.Actuators.Valves.TwoWayLinearvalSouth2Valves on souther tabs section 2
Annex60.Fluid.Actuators.Valves.TwoWayLinearvalNorth1Valves on northern tabs section 1
Annex60.Fluid.Actuators.Valves.TwoWayLinearvalNorth2Valves on northern tabs section 2
Modelica.Blocks.Math.BooleanToIntegerbooleanToIntegerBoolean to integer conversion block
Modelica.Blocks.Sources.BooleanPulsestepPumpStep control
Modelica.Blocks.Sources.SinesineValve control signal
Annex60.Fluid.Actuators.Valves.ThreeWayLinearvalSouthThree way valve for controlling supply temperature to south of building
Annex60.Fluid.Actuators.Valves.ThreeWayLinearvalNorthThree way valve for controlling supply temperature to north of building
Annex60.Fluid.HeatExchangers.HeaterCooler_TheaterHeating device
Annex60.Fluid.Sources.Boundary_pTbouBoundary for setting absolute temperature
Annex60.Fluid.FixedResistances.JunctionsplSplitter
Annex60.Fluid.FixedResistances.Junctionspl1Splitter
Annex60.Fluid.Movers.FlowControlled_m_flowpumpHeaPump for circulating hot water
Modelica.Blocks.Sources.ConstantThotHot water temperature
Annex60.Fluid.Actuators.Valves.TwoWayLinearvalHeaValve for allowing water to be drawn from hot water circuit
Modelica.Blocks.Sources.PulsestepValveSet point for valves
Annex60.Fluid.Actuators.Valves.TwoWayLinearvalCooValve for allowing water to be drawn from cold water circuit
Modelica.Blocks.Sources.RealExpressionvalCooExpCooling valve opens when heating valve is closed
Annex60.Fluid.FixedResistances.Junctionspl2Splitter
Annex60.Fluid.FixedResistances.Junctionspl3Splitter
Annex60.Fluid.Movers.FlowControlled_m_flowpumpCooPump for circulating cold water
Annex60.Fluid.MixingVolumes.MixingVolumevolSimplified model of cold water source
Modelica.Thermal.HeatTransfer.Sources.FixedTemperatureTcoldCold water temperature
Annex60.Fluid.FixedResistances.PressureDrop[4]tabsSouth1Pressure drop of southern tabs sections on collector 1
Annex60.Fluid.FixedResistances.PressureDrop[8]tabsSouth2Pressure drop of southern tabs sections on collector 2
Annex60.Fluid.FixedResistances.PressureDrop[4]tabsNorth1Pressure drop of northern tabs sections on collector 1
Annex60.Fluid.FixedResistances.PressureDrop[8]tabsNorth2Pressure drop of northern tabs sections on collector 2

Contents

NameDescription
MediumMedium model

Revisions

  • October 7, 2016, by Filip Jorissen:
    First implementation.