Name | Description |
---|---|
PartialStaticTwoPortCoolingTower | Cooling tower with variable speed |
Type | Name | Default | Description |
---|---|---|---|
replaceable package Medium | PartialMedium | Medium in the component | |
Nominal condition | |||
MassFlowRate | m_flow_nominal | Nominal mass flow rate [kg/s] | |
Pressure | dp_nominal | Pressure [Pa] | |
Initialization | |||
MassFlowRate | m_flow.start | 0 | Mass flow rate from port_a to port_b (m_flow > 0 is design flow direction) [kg/s] |
Pressure | dp.start | 0 | Pressure difference between port_a and port_b [Pa] |
Assumptions | |||
Boolean | allowFlowReversal | system.allowFlowReversal | = true to allow flow reversal, false restricts to design direction (port_a -> port_b) |
Advanced | |||
MassFlowRate | m_flow_small | 1E-4*m_flow_nominal | Small mass flow rate for regularization of zero flow [kg/s] |
Diagnostics | |||
Boolean | show_V_flow | true | = true, if volume flow rate at inflowing port is computed |
Initialization | |||
AbsolutePressure | p_a_start | system.p_start | Guess value for inlet pressure [Pa] |
AbsolutePressure | p_b_start | p_a_start | Guess value for outlet pressure [Pa] |
Flow resistance | |||
Boolean | from_dp | true | = true, use m_flow = f(dp) else dp = f(m_flow) |
Boolean | linearizeFlowResistance | false | = true, use linear relation between m_flow and dp for any flow rate |
Real | deltaM | 0.1 | Fraction of nominal flow rate where flow transitions to laminar |
Type | Name | Description |
---|---|---|
FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
input RealInput | TAir | Entering air dry or wet bulb temperature |
partial model PartialStaticTwoPortCoolingTower "Cooling tower with variable speed" extends Fluid.Interfaces.PartialStaticTwoPortHeatMassTransfer; extends Buildings.BaseClasses.BaseIcon; Modelica.SIunits.Conversions.NonSIunits.Temperature_degC TWatIn_degC( start=35) "Water inlet temperature"; Modelica.SIunits.Conversions.NonSIunits.Temperature_degC TWatOut_degC( start=28) "Water outlet temperature"; Modelica.SIunits.Conversions.NonSIunits.Temperature_degC TAirIn_degC( start=25) "Air dry-bulb inlet temperature"; Modelica.Blocks.Interfaces.RealInput TAir "Entering air dry or wet bulb temperature"; equation TWatIn_degC = Modelica.SIunits.Conversions.to_degC(Medium.temperature(sta_a)); TWatOut_degC = Modelica.SIunits.Conversions.to_degC(Medium.temperature(sta_b)); TAirIn_degC = Modelica.SIunits.Conversions.to_degC(TAir); mXi_flow = zeros(Medium.nXi); // no mass added or removed (sensible heat only) end PartialStaticTwoPortCoolingTower;