modelDHCSubstationHeatPumpDirectCooling

Substation model for bidirctional low-temperature networks for buildings with heat pump and direct cooling.
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Information

Substation model for bidirectional low-temperature networks for buildings with heat pump and direct cooling. In the case of simultaneous cooling and heating demands, the return flows are used as supply flows for the other application for energy balancing. This model uses the heat pump AixLib.Fluid.HeatPumps.Carnot_TCon. The mass flows are controlled equation-based and calculated using the heating and cooling demands and the specified temperatures of the warm and cold line of the network.

Parameters

TypeNameDefaultDescription
Modelica.Units.SI.Pressuredp_nominal30000Nominal pressure drop
General › Building System
Modelica.Units.SI.MassFlowRatem_flow_nominalm_flow_nominalNominal mass flow rate
Modelica.Units.SI.HeatFlowRateheaDem_maxMaximum heat demand for scaling of heat pump
Modelica.Units.SI.TemperaturedeltaT_heaSecSet10Set temperature difference for heating on secondary site (building system)
Modelica.Units.SI.TemperatureT_heaSecSet273.15 + 55Set supply temperature for space heating on secondary side (building)
General › Grid
Modelica.Units.SI.TemperatureT_heaPriSet273.15 + 22Set temperature of primary side (warm line of grid)
Modelica.Units.SI.TemperatureT_cooPriSet273.15 + 12Set temperature of primary side (cold line of grid)

Connectors

TypeNameDefaultDescription
Modelica.Fluid.Interfaces.FluidPort_aport_aFluid connector for connecting the substation to the warm line of the network
Modelica.Fluid.Interfaces.FluidPort_bport_bFluid connector for connecting the substation to the cold line of the network
Modelica.Blocks.Interfaces.RealInputheaDemInput for heat demand profile of substation
Modelica.Blocks.Interfaces.RealInputcooDemInput for cooling demand profile of substation
Modelica.Blocks.Interfaces.RealOutputP_el_heaPumElectrical power consumed by heat pump

Components

TypeNameDefaultDescription
Delays.DelayFirstOrdervol
Delays.DelayFirstOrdervol1
Movers.FlowControlled_m_flowpumHeaPridecentral distribution pump for heating on primary side
Sources.MassFlowSource_TsouHeaSec
Modelica.Blocks.Sources.ConstantT_heaPumInSecInlet temperatur of heat pump on secondary side
Sources.Boundary_pTsinHeaSec
Modelica.Blocks.Sources.Constantconst
Modelica.Blocks.Math.Divisionm_flow_heaSecMass flow rate on secondary side
HeatPumps.Carnot_TConheaPum
Modelica.Blocks.Math.Divisiondivision1
Modelica.Blocks.Sources.RealExpressionrealExpression
Modelica.Blocks.Math.Addadd1
FixedResistances.Junctionjun
FixedResistances.Junctionjun1
Delays.DelayFirstOrderdirCooIdeal heat exchanger for direct cooling
Movers.FlowControlled_m_flowpumCoodecentral distribution pump for cooling on primary side
Modelica.Blocks.Math.Divisiondivision2
Modelica.Blocks.Sources.RealExpressionrealExpression1
Modelica.Blocks.Sources.ConstantT_heaPumSet
Modelica.Thermal.HeatTransfer.Sources.PrescribedHeatFlowprescribedHeatFlow
Sensors.TemperatureTwoPortsenT_heaPumOutPri
Sensors.TemperatureTwoPortsenT_heaPumInPri
Sensors.TemperatureTwoPortsenT_heaPumOutSecOutlet temperature of heat pump on secondary side
Sensors.TemperatureTwoPortsenT_heaPumInSecInlet temperatur of heat pump on secondary side
Sensors.TemperatureTwoPortsenT_dirCooInPriInlet temperature of ideal heat exchanger for direct cooling on primary side
Sensors.TemperatureTwoPortsenT_dirCooOutPriOutlet temperature of ideal heat exchanger for direct cooling on primary side
Modelica.Blocks.Sources.RealExpressionrealExpression2
Modelica.Blocks.Sources.RealExpressionrealExpression3
Modelica.Blocks.Sources.RealExpressionrealExpression4

Contents

NameDescription
MediumMedium model for water

Revisions

  • October 08, 2020,by Tobias Blacha:
    Move to development
  • August 09, 2018 ,by Tobias Blacha:
    Implemented