modelDC_DirectConsumer_freeCooling

Four port model of district cooling consumer with continous demand and free cooling capacity.

Extends from dhcSim.DHC.Submodules.FourPortModules.DistrictCooling.Consumer.BaseClasses.DC_DirectConsumer (Four port model of district cooling consumer with continous demand - base class.).

Parameters

TypeNameDefaultDescription
dhcSim.Fluid.Types.FeedingTemperatureConretTempType (from DC_DirectConsumer)dhcSim.Fluid.Types.FeedingTemperatureCon.fixedDefine how return temperature is caclulated
Modelica.SIunits.TemperatureTNetRetSet (from DC_DirectConsumer)Medium.T_defaultReturn temperature if retTempType=fixed
Modelica.SIunits.TemperatureDifferencedeltaT (from DC_DirectConsumer)5Temperature difference between inlet and outlet if retTempType = dTFix
Modelica.SIunits.TemperatureT_lim_upper273.15 + 10Upper temperature limit
Modelica.SIunits.TemperatureT_lim_lower273.15 + 5Lower temperature limit
Modelica.SIunits.HeatFlowRateQ_flow_freeCool_max1000Maximum free cooling heat flow rate
Flow resistance
BooleancomputeFlowResistance (from TwoPortFlowResistanceParameters)true=true, compute flow resistance. Set to false to assume no friction
Booleanfrom_dp (from TwoPortFlowResistanceParameters)false= true, use m_flow = f(dp) else dp = f(m_flow)
BooleanlinearizeFlowResistance (from TwoPortFlowResistanceParameters)false= true, use linear relation between m_flow and dp for any flow rate
RealdeltaM (from TwoPortFlowResistanceParameters)0.1Fraction of nominal flow rate where flow transitions to laminar
Nominal condition
Modelica.Units.SI.PressureDifferencedp_nominal (from TwoPortFlowResistanceParameters)Pressure difference
Modelica.SIunits.MassFlowRatem_flow_nominal (from FourPortModulesParameters)Nominal mass flow rate
Modelica.SIunits.HeatFlowRateQ_flow_nominal (from DC_DirectConsumer)Nominal heat flow rate
Modelica.SIunits.TemperatureTNetIn_nominal (from DC_DirectConsumer)Medium.T_defaultNominal Temperature of inflow at network side
Modelica.SIunits.TemperatureTNetOut_nominal (from DC_DirectConsumer)Medium.T_defaultNominal Temperature of outflow at network side
Modelica.SIunits.TemperatureTBuiIn_nominal (from DC_DirectConsumer)Medium.T_defaultNominal Temperature of inflow at building side
Modelica.SIunits.TemperatureTBuiOut_nominal (from DC_DirectConsumer)Medium.T_defaultNominal Temperature of outflow at building side
Assumptions
BooleanallowFlowReversal (from FourPortModulesParameters)true= true to allow flow reversal, false restricts to design direction (port_a -> port_b)
Advanced › Diagnostics
Booleanshow_T (from FourPortModulesParameters)false= true, if actual temperature at port is computed
Advanced
Modelica.SIunits.MassFlowRatem_flow_small (from FourPortModulesParameters)1E-4*abs(m_flow_nominal)Small mass flow rate for regularization of zero flow

Connectors

TypeNameDefaultDescription
Modelica.Blocks.Interfaces.RealOutputQ_flow_out (from DC_DirectConsumer)
Modelica.Blocks.Interfaces.RealOutputdp_out (from DC_DirectConsumer)
Modelica.Blocks.Interfaces.RealInputT_Amb_inAmbient temperature input signal
Modelica.Blocks.Interfaces.RealOutputQ_flow_freeCooling_out
Modelica.Blocks.Interfaces.RealOutputQ_flow_conv_out

Components

TypeNameDefaultDescription
Modelica.SIunits.TemperatureTRetInt (from DC_DirectConsumer)Internal calculated return temperature of consumer on grid side
Modelica.SIunits.HeatFlowRateQ_flowTot (from DC_DirectConsumer)Total heat flow rate; <0=cool producer, >0=cool consumer
dhcSim.DHC.Submodules.TwoPortModules.CoolConsumer_DirectactCon (from DC_DirectConsumer)
Modelica.SIunits.HeatFlowRateQ_flow_freeCoolFree cooling heat flow rate
Modelica.SIunits.HeatFlowRateQ_flow_convConventiional cooling hat flow rate
Buildings.Controls.OBC.CDL.Continuous.Hysteresishys
Modelica.Blocks.Sources.RealExpressionrealExpression
Modelica.Blocks.Sources.RealExpressionrealExpression1