Buildings.Fluid.HeatExchangers

Package with heat exchanger models

Information

This package contains models for heat exchangers with and without humidity condensation.

Package Content

Name Description

BaseClasses Package with base classes for heat exchanger models

ConstantEffectiveness Heat exchanger with constant effectiveness

CoolingTowers Package with cooling tower models

DryCoilDiscretized Coil with discretization along the flow paths and no humidity condensation

Examples Collection of models that illustrate model use and test models

HeaterCoolerPrescribed Heater or cooler with prescribed heat flow rate

Radiators Package with radiators models for hydronic space heating systems

WetCoilDiscretized Coil with discretization along the flow paths and humidity condensation

Name	Description
BaseClasses	Package with base classes for heat exchanger models
ConstantEffectiveness	Heat exchanger with constant effectiveness
CoolingTowers	Package with cooling tower models
DryCoilDiscretized	Coil with discretization along the flow paths and no humidity condensation
Examples	Collection of models that illustrate model use and test models
HeaterCoolerPrescribed	Heater or cooler with prescribed heat flow rate
Radiators	Package with radiators models for hydronic space heating systems
WetCoilDiscretized	Coil with discretization along the flow paths and humidity condensation

Buildings.Fluid.HeatExchangers.ConstantEffectiveness

Heat exchanger with constant effectiveness

Buildings.Fluid.HeatExchangers.ConstantEffectiveness

Information

Model for a heat exchanger with constant effectiveness.

This model transfers heat in the amount of

  Q = Q_max * eps,

where eps is a constant effectiveness and Q_max is the maximum heat that can be transferred.

For a heat and moisture exchanger, use Buildings.Fluid.MassExchangers.ConstantEffectiveness instead of this model.

Extends from Fluid.Interfaces.PartialStaticFourPortHeatMassTransfer (Partial model transporting two fluid streams between four ports without storing mass or energy), Buildings.BaseClasses.BaseIcon (Base icon).

Parameters

Type Name Default Description

replaceable package Medium1 PartialMedium Medium 1 in the component

replaceable package Medium2 PartialMedium Medium 2 in the component

Real eps 0.8 Heat exchanger effectiveness

Nominal condition

MassFlowRate m1_flow_nominal Nominal mass flow rate [kg/s]

MassFlowRate m2_flow_nominal m1_flow_nominal Nominal mass flow rate [kg/s]

Pressure dp1_nominal Pressure [Pa]

Pressure dp2_nominal Pressure [Pa]

Initialization

MassFlowRate m1_flow.start 0 Mass flow rate from port_a1 to port_b1 (m1_flow > 0 is design flow direction) [kg/s]

Pressure dp1.start 0 Pressure difference between port_a1 and port_b1 [Pa]

MassFlowRate m2_flow.start 0 Mass flow rate from port_a2 to port_b2 (m2_flow > 0 is design flow direction) [kg/s]

Pressure dp2.start 0 Pressure difference between port_a2 and port_b2 [Pa]

Assumptions

Boolean allowFlowReversal1 system.allowFlowReversal = true to allow flow reversal in medium 1, false restricts to design direction (port_a -> port_b)

Boolean allowFlowReversal2 system.allowFlowReversal = true to allow flow reversal in medium 2, false restricts to design direction (port_a -> port_b)

Advanced

MassFlowRate m1_flow_small 1E-4*m1_flow_nominal Small mass flow rate for regularization of zero flow [kg/s]

MassFlowRate m2_flow_small 1E-4*m2_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_a1_start system.p_start Guess value for inlet pressure [Pa]

AbsolutePressure p_b1_start p_a1_start Guess value for outlet pressure [Pa]

AbsolutePressure p_a2_start system.p_start Guess value for inlet pressure [Pa]

AbsolutePressure p_b2_start p_a2_start Guess value for outlet pressure [Pa]

Flow resistance

Medium 1

Boolean from_dp1 true = true, use m_flow = f(dp) else dp = f(m_flow)

Boolean linearizeFlowResistance1 false = true, use linear relation between m_flow and dp for any flow rate

Real deltaM1 0.1 Fraction of nominal flow rate where flow transitions to laminar

Medium 2

Boolean from_dp2 true = true, use m_flow = f(dp) else dp = f(m_flow)

Boolean linearizeFlowResistance2 false = true, use linear relation between m_flow and dp for any flow rate

Real deltaM2 0.1 Fraction of nominal flow rate where flow transitions to laminar

Type	Name	Default	Description
replaceable package Medium1	PartialMedium	Medium 1 in the component
replaceable package Medium2	PartialMedium	Medium 2 in the component
Real	eps	0.8	Heat exchanger effectiveness
Nominal condition
MassFlowRate	m1_flow_nominal		Nominal mass flow rate [kg/s]
MassFlowRate	m2_flow_nominal	m1_flow_nominal	Nominal mass flow rate [kg/s]
Pressure	dp1_nominal		Pressure [Pa]
Pressure	dp2_nominal		Pressure [Pa]
Initialization
MassFlowRate	m1_flow.start	0	Mass flow rate from port_a1 to port_b1 (m1_flow > 0 is design flow direction) [kg/s]
Pressure	dp1.start	0	Pressure difference between port_a1 and port_b1 [Pa]
MassFlowRate	m2_flow.start	0	Mass flow rate from port_a2 to port_b2 (m2_flow > 0 is design flow direction) [kg/s]
Pressure	dp2.start	0	Pressure difference between port_a2 and port_b2 [Pa]
Assumptions
Boolean	allowFlowReversal1	system.allowFlowReversal	= true to allow flow reversal in medium 1, false restricts to design direction (port_a -> port_b)
Boolean	allowFlowReversal2	system.allowFlowReversal	= true to allow flow reversal in medium 2, false restricts to design direction (port_a -> port_b)
Advanced
MassFlowRate	m1_flow_small	1E-4*m1_flow_nominal	Small mass flow rate for regularization of zero flow [kg/s]
MassFlowRate	m2_flow_small	1E-4*m2_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_a1_start	system.p_start	Guess value for inlet pressure [Pa]
AbsolutePressure	p_b1_start	p_a1_start	Guess value for outlet pressure [Pa]
AbsolutePressure	p_a2_start	system.p_start	Guess value for inlet pressure [Pa]
AbsolutePressure	p_b2_start	p_a2_start	Guess value for outlet pressure [Pa]
Flow resistance
Medium 1
Boolean	from_dp1	true	= true, use m_flow = f(dp) else dp = f(m_flow)
Boolean	linearizeFlowResistance1	false	= true, use linear relation between m_flow and dp for any flow rate
Real	deltaM1	0.1	Fraction of nominal flow rate where flow transitions to laminar
Medium 2
Boolean	from_dp2	true	= true, use m_flow = f(dp) else dp = f(m_flow)
Boolean	linearizeFlowResistance2	false	= true, use linear relation between m_flow and dp for any flow rate
Real	deltaM2	0.1	Fraction of nominal flow rate where flow transitions to laminar

Connectors

Type Name Description

FluidPort_a port_a1 Fluid connector a1 (positive design flow direction is from port_a1 to port_b1)

FluidPort_b port_b1 Fluid connector b1 (positive design flow direction is from port_a1 to port_b1)

FluidPort_a port_a2 Fluid connector a2 (positive design flow direction is from port_a2 to port_b2)

FluidPort_b port_b2 Fluid connector b2 (positive design flow direction is from port_a2 to port_b2)

Type	Name	Description
FluidPort_a	port_a1	Fluid connector a1 (positive design flow direction is from port_a1 to port_b1)
FluidPort_b	port_b1	Fluid connector b1 (positive design flow direction is from port_a1 to port_b1)
FluidPort_a	port_a2	Fluid connector a2 (positive design flow direction is from port_a2 to port_b2)
FluidPort_b	port_b2	Fluid connector b2 (positive design flow direction is from port_a2 to port_b2)

Modelica definition

model ConstantEffectiveness 
  "Heat exchanger with constant effectiveness"
  extends Fluid.Interfaces.PartialStaticFourPortHeatMassTransfer;
  extends Buildings.BaseClasses.BaseIcon;
  parameter Real eps(min=0, max=1) = 0.8 "Heat exchanger effectiveness";

  Modelica.SIunits.Temperature T_in1 "Inlet temperature medium 1";
  Modelica.SIunits.Temperature T_in2 "Inlet temperature medium 2";
  Modelica.SIunits.ThermalConductance C1_flow 
    "Heat capacity flow rate medium 1";
  Modelica.SIunits.ThermalConductance C2_flow 
    "Heat capacity flow rate medium 2";
  Modelica.SIunits.ThermalConductance CMin_flow(min=0) 
    "Minimum heat capacity flow rate";
  Modelica.SIunits.HeatFlowRate QMax_flow "Maximum heat flow rate";

equation 
  // Definitions for heat transfer effectiveness model
  T_in1 = if m1_flow >= 0 then Medium1.temperature(sta_a1) else 
                                Medium1.temperature(sta_b1);
  T_in2 = if m2_flow >= 0 then Medium2.temperature(sta_a2) else 
                                Medium2.temperature(sta_b2);

  // The specific heat capacity is computed using the state of the
  // medium at port_a. For forward flow, this is correct, for reverse flow,
  // this is an approximation.
  C1_flow = abs(m1_flow)* Medium1.specificHeatCapacityCp(sta_a1);
  C2_flow = abs(m2_flow)* Medium2.specificHeatCapacityCp(sta_a2);

  CMin_flow = min(C1_flow, C2_flow);
  QMax_flow = CMin_flow * (T_in2 - T_in1);

  // transferred heat
  Q1_flow = eps * QMax_flow;
  0 = Q1_flow + Q2_flow;

  // no mass exchange
  mXi1_flow = zeros(Medium1.nXi);
  mXi2_flow = zeros(Medium2.nXi);
end ConstantEffectiveness;

Buildings.Fluid.HeatExchangers.DryCoilDiscretized

Coil with discretization along the flow paths and no humidity condensation

Buildings.Fluid.HeatExchangers.DryCoilDiscretized

Information

Model of a discretized coil with no water vapor condensation. The coil consists of nReg registers that are perpendicular to the air flow path. Each register consists of nPipPar parallel pipes, and each pipe can be divided into nPipSeg pipe segments along the pipe length. Thus, the smallest element of the coil consists of a pipe segment. Each pipe segment is modeled by an instance of Buildings.Fluid.HeatExchangers.BaseClasses.HexElement. Each element has a state variable for the metal. Depending on the value of the boolean parameters steadyState_1 and steadyState_2, the fluid states are modeled dynamically or in steady state. If the parameter steadyStateDuctConnection is set the false, then a mixing volume of length dl is added to the duct connection. This can help reducing the dimension of the nonlinear system of equations.

The convective heat transfer coefficients can, for each fluid individually, be computed as a function of the flow rate and/or the temperature, or assigned to a constant. This computation is done using an instance of Buildings.Fluid.HeatExchangers.BaseClasses.HADryCoil.

In this model, the water (or liquid) flow path needs to be connected to port_a1 and port_b1, and the air flow path need to be connected to the other two ports.

To model humidity condensation, use the model Buildings.Fluid.HeatExchangers.WetCoilDiscretized instead of this model, as this model computes only sensible heat transfer.

Extends from Fluid.Interfaces.PartialStaticFourPortInterface (Partial model transporting fluid between two ports without storing mass or energy), Buildings.Fluid.Interfaces.FourPortFlowResistanceParameters (Parameters for flow resistance for models with four ports).

Parameters

Type Name Default Description

replaceable package Medium1 PartialMedium Medium 1 in the component

replaceable package Medium2 PartialMedium Medium 2 in the component

Nominal condition

MassFlowRate m1_flow_nominal Nominal mass flow rate [kg/s]

MassFlowRate m2_flow_nominal m1_flow_nominal Nominal mass flow rate [kg/s]

Pressure dp1_nominal Pressure [Pa]

Pressure dp2_nominal Pressure [Pa]

TemperatureDifference dT_nominal 10 Temperature difference [K]

HeatFlowRate Q_flow_nominal 1000 Heat transfer at dT_nominal [W]

ThermalConductance UA_nominal Q_flow_nominal/dT_nominal Thermal conductance at nominal flow, used to compute heat capacity [W/K]

Time tau1 20 Time constant at nominal flow for medium 1 [s]

Time tau2 1 Time constant at nominal flow for medium 2 [s]

Time tau_m 20 Time constant of metal at nominal UA value [s]

Initialization

MassFlowRate m1_flow.start 0 Mass flow rate from port_a1 to port_b1 (m1_flow > 0 is design flow direction) [kg/s]

Pressure dp1.start 0 Pressure difference between port_a1 and port_b1 [Pa]

MassFlowRate m2_flow.start 0 Mass flow rate from port_a2 to port_b2 (m2_flow > 0 is design flow direction) [kg/s]

Pressure dp2.start 0 Pressure difference between port_a2 and port_b2 [Pa]

MassFlowRate mStart_flow_a1 m1_flow_nominal Guess value for mass flow rate at port_a1 [kg/s]

MassFlowRate mStart_flow_a2 m2_flow_nominal Guess value for mass flow rate at port_a2 [kg/s]

Geometry

Integer nReg 2 Number of registers

Integer nPipPar 3 Number of parallel pipes in each register

Integer nPipSeg 4 Number of pipe segments per register used for discretization

Length dh1 0.025 Hydraulic diameter for a single pipe [m]

Length dh2 1 Hydraulic diameter for duct [m]

Assumptions

Boolean allowFlowReversal1 system.allowFlowReversal = true to allow flow reversal in medium 1, false restricts to design direction (port_a -> port_b)

Boolean allowFlowReversal2 system.allowFlowReversal = true to allow flow reversal in medium 2, false restricts to design direction (port_a -> port_b)

Dynamics

Dynamics energyDynamics1 Modelica.Fluid.Types.Dynamic... Default formulation of energy balances for volume 1

Dynamics energyDynamics2 Modelica.Fluid.Types.Dynamic... Default formulation of energy balances for volume 2

Dynamics ductConnectionDynamics Modelica.Fluid.Types.Dynamic... Default formulation of energy balances for duct connection

Length dl 0.3 Length of mixing volume for duct connection [m]

Advanced

MassFlowRate m1_flow_small 1E-4*m1_flow_nominal Small mass flow rate for regularization of zero flow [kg/s]

MassFlowRate m2_flow_small 1E-4*m2_flow_nominal Small mass flow rate for regularization of zero flow [kg/s]

Boolean use_dh1 false Set to true to specify hydraulic diameter for pipe pressure drop

Boolean use_dh2 false Set to true to specify hydraulic diameter for duct pressure drop)

Real ReC_1 4000 Reynolds number where transition to turbulent starts inside pipes

Real ReC_2 4000 Reynolds number where transition to turbulent starts inside ducts

Diagnostics

Boolean show_V_flow true = true, if volume flow rate at inflowing port is computed

Initialization

AbsolutePressure p_a1_start system.p_start Guess value for inlet pressure [Pa]

AbsolutePressure p_b1_start p_a1_start Guess value for outlet pressure [Pa]

AbsolutePressure p_a2_start system.p_start Guess value for inlet pressure [Pa]

AbsolutePressure p_b2_start p_a2_start Guess value for outlet pressure [Pa]

Flow resistance

Medium 1

Boolean computeFlowResistance1 true =true, compute flow resistance. Set to false to assume no friction

Boolean from_dp1 false = true, use m_flow = f(dp) else dp = f(m_flow)

Boolean linearizeFlowResistance1 false = true, use linear relation between m_flow and dp for any flow rate

Real deltaM1 0.1 Fraction of nominal flow rate where flow transitions to laminar

Medium 2

Boolean computeFlowResistance2 true =true, compute flow resistance. Set to false to assume no friction

Boolean from_dp2 false = true, use m_flow = f(dp) else dp = f(m_flow)

Boolean linearizeFlowResistance2 false = true, use linear relation between m_flow and dp for any flow rate

Real deltaM2 0.1 Fraction of nominal flow rate where flow transitions to laminar

Heat transfer

Boolean waterSideFlowDependent false Set to false to make water-side hA independent of mass flow rate

Boolean airSideFlowDependent false Set to false to make air-side hA independent of mass flow rate

Boolean waterSideTemperatureDependent false Set to false to make water-side hA independent of temperature

Type	Name	Default	Description
replaceable package Medium1	PartialMedium	Medium 1 in the component
replaceable package Medium2	PartialMedium	Medium 2 in the component
Nominal condition
MassFlowRate	m1_flow_nominal		Nominal mass flow rate [kg/s]
MassFlowRate	m2_flow_nominal	m1_flow_nominal	Nominal mass flow rate [kg/s]
Pressure	dp1_nominal		Pressure [Pa]
Pressure	dp2_nominal		Pressure [Pa]
TemperatureDifference	dT_nominal	10	Temperature difference [K]
HeatFlowRate	Q_flow_nominal	1000	Heat transfer at dT_nominal [W]
ThermalConductance	UA_nominal	Q_flow_nominal/dT_nominal	Thermal conductance at nominal flow, used to compute heat capacity [W/K]
Time	tau1	20	Time constant at nominal flow for medium 1 [s]
Time	tau2	1	Time constant at nominal flow for medium 2 [s]
Time	tau_m	20	Time constant of metal at nominal UA value [s]
Initialization
MassFlowRate	m1_flow.start	0	Mass flow rate from port_a1 to port_b1 (m1_flow > 0 is design flow direction) [kg/s]
Pressure	dp1.start	0	Pressure difference between port_a1 and port_b1 [Pa]
MassFlowRate	m2_flow.start	0	Mass flow rate from port_a2 to port_b2 (m2_flow > 0 is design flow direction) [kg/s]
Pressure	dp2.start	0	Pressure difference between port_a2 and port_b2 [Pa]
MassFlowRate	mStart_flow_a1	m1_flow_nominal	Guess value for mass flow rate at port_a1 [kg/s]
MassFlowRate	mStart_flow_a2	m2_flow_nominal	Guess value for mass flow rate at port_a2 [kg/s]
Geometry
Integer	nReg	2	Number of registers
Integer	nPipPar	3	Number of parallel pipes in each register
Integer	nPipSeg	4	Number of pipe segments per register used for discretization
Length	dh1	0.025	Hydraulic diameter for a single pipe [m]
Length	dh2	1	Hydraulic diameter for duct [m]
Assumptions
Boolean	allowFlowReversal1	system.allowFlowReversal	= true to allow flow reversal in medium 1, false restricts to design direction (port_a -> port_b)
Boolean	allowFlowReversal2	system.allowFlowReversal	= true to allow flow reversal in medium 2, false restricts to design direction (port_a -> port_b)
Dynamics
Dynamics	energyDynamics1	Modelica.Fluid.Types.Dynamic...	Default formulation of energy balances for volume 1
Dynamics	energyDynamics2	Modelica.Fluid.Types.Dynamic...	Default formulation of energy balances for volume 2
Dynamics	ductConnectionDynamics	Modelica.Fluid.Types.Dynamic...	Default formulation of energy balances for duct connection
Length	dl	0.3	Length of mixing volume for duct connection [m]
Advanced
MassFlowRate	m1_flow_small	1E-4*m1_flow_nominal	Small mass flow rate for regularization of zero flow [kg/s]
MassFlowRate	m2_flow_small	1E-4*m2_flow_nominal	Small mass flow rate for regularization of zero flow [kg/s]
Boolean	use_dh1	false	Set to true to specify hydraulic diameter for pipe pressure drop
Boolean	use_dh2	false	Set to true to specify hydraulic diameter for duct pressure drop)
Real	ReC_1	4000	Reynolds number where transition to turbulent starts inside pipes
Real	ReC_2	4000	Reynolds number where transition to turbulent starts inside ducts
Diagnostics
Boolean	show_V_flow	true	= true, if volume flow rate at inflowing port is computed
Initialization
AbsolutePressure	p_a1_start	system.p_start	Guess value for inlet pressure [Pa]
AbsolutePressure	p_b1_start	p_a1_start	Guess value for outlet pressure [Pa]
AbsolutePressure	p_a2_start	system.p_start	Guess value for inlet pressure [Pa]
AbsolutePressure	p_b2_start	p_a2_start	Guess value for outlet pressure [Pa]
Flow resistance
Medium 1
Boolean	computeFlowResistance1	true	=true, compute flow resistance. Set to false to assume no friction
Boolean	from_dp1	false	= true, use m_flow = f(dp) else dp = f(m_flow)
Boolean	linearizeFlowResistance1	false	= true, use linear relation between m_flow and dp for any flow rate
Real	deltaM1	0.1	Fraction of nominal flow rate where flow transitions to laminar
Medium 2
Boolean	computeFlowResistance2	true	=true, compute flow resistance. Set to false to assume no friction
Boolean	from_dp2	false	= true, use m_flow = f(dp) else dp = f(m_flow)
Boolean	linearizeFlowResistance2	false	= true, use linear relation between m_flow and dp for any flow rate
Real	deltaM2	0.1	Fraction of nominal flow rate where flow transitions to laminar
Heat transfer
Boolean	waterSideFlowDependent	false	Set to false to make water-side hA independent of mass flow rate
Boolean	airSideFlowDependent	false	Set to false to make air-side hA independent of mass flow rate
Boolean	waterSideTemperatureDependent	false	Set to false to make water-side hA independent of temperature

Connectors

Type	Name	Description
FluidPort_a	port_a1	Fluid connector a1 (positive design flow direction is from port_a1 to port_b1)
FluidPort_b	port_b1	Fluid connector b1 (positive design flow direction is from port_a1 to port_b1)
FluidPort_a	port_a2	Fluid connector a2 (positive design flow direction is from port_a2 to port_b2)
FluidPort_b	port_b2	Fluid connector b2 (positive design flow direction is from port_a2 to port_b2)

Modelica definition

model DryCoilDiscretized 
  "Coil with discretization along the flow paths and no humidity condensation"
  extends Fluid.Interfaces.PartialStaticFourPortInterface;
  extends Buildings.Fluid.Interfaces.FourPortFlowResistanceParameters(
    final computeFlowResistance1=true,
    final computeFlowResistance2=true,
    from_dp1 = false,
    from_dp2 = false);

  parameter Modelica.SIunits.TemperatureDifference dT_nominal(min=0) = 10 
    "Temperature difference";
  parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal(min=0) = 1000 
    "Heat transfer at dT_nominal";
  parameter Modelica.SIunits.ThermalConductance UA_nominal(min=0) = Q_flow_nominal/dT_nominal 
    "Thermal conductance at nominal flow, used to compute heat capacity";
  parameter Integer nReg(min=2)=2 "Number of registers";
  parameter Integer nPipPar(min=1) = 3 
    "Number of parallel pipes in each register";
  parameter Integer nPipSeg(min=1) = 4 
    "Number of pipe segments per register used for discretization";
  parameter Boolean use_dh1 = false 
    "Set to true to specify hydraulic diameter for pipe pressure drop";
  parameter Boolean use_dh2 = false 
    "Set to true to specify hydraulic diameter for duct pressure drop)";

  parameter Modelica.Fluid.Types.Dynamics energyDynamics1=
    Modelica.Fluid.Types.Dynamics.DynamicFreeInitial 
    "Default formulation of energy balances for volume 1";
  parameter Modelica.Fluid.Types.Dynamics energyDynamics2=
    Modelica.Fluid.Types.Dynamics.DynamicFreeInitial 
    "Default formulation of energy balances for volume 2";

  Buildings.Fluid.HeatExchangers.BaseClasses.CoilRegister hexReg[nReg](
    redeclare each package Medium1 = Medium1,
    redeclare each package Medium2 = Medium2,
    each final allowFlowReversal1=allowFlowReversal1,
    each final allowFlowReversal2=allowFlowReversal2,
    each final nPipPar=nPipPar,
    each final nPipSeg=nPipSeg,
    each final UA_nominal=Q_flow_nominal/dT_nominal/nReg,
    each final m1_flow_nominal=m1_flow_nominal/nPipPar,
    each final m2_flow_nominal=m1_flow_nominal/nPipPar/nPipSeg,
    each tau1=tau1,
    each tau2=tau2,
    each tau_m=tau_m,
    each final energyDynamics1=energyDynamics1,
    each final energyDynamics2=energyDynamics2,
    each allowCondensation=allowCondensation,
    each from_dp1=from_dp1,
    each linearizeFlowResistance1=linearizeFlowResistance1,
    each deltaM1=deltaM1,
    each from_dp2=from_dp2,
    each linearizeFlowResistance2=linearizeFlowResistance2,
    each deltaM2=deltaM2,
    each dp1_nominal=dp1_nominal/nReg,
    each dp2_nominal=dp2_nominal/nReg) "Heat exchanger register";
  Buildings.Fluid.HeatExchangers.BaseClasses.PipeManifoldFixedResistance
    pipMan_a(
    redeclare package Medium = Medium1,
    final nPipPar=nPipPar,
    final m_flow_nominal=m1_flow_nominal,
    final dp_nominal=dp1_nominal,
    final dh=dh1,
    final ReC=ReC_1,
    final mStart_flow_a=mStart_flow_a1,
    final linearized=linearizeFlowResistance1,
    final use_dh=use_dh1,
    final deltaM=deltaM1,
    final from_dp=from_dp1,
    final allowFlowReversal=allowFlowReversal1) "Pipe manifold at port a";
  Buildings.Fluid.HeatExchangers.BaseClasses.PipeManifoldNoResistance pipMan_b(
    redeclare package Medium = Medium1,
    final nPipPar=nPipPar,
    final mStart_flow_a=-mStart_flow_a1,
    final allowFlowReversal=allowFlowReversal1) "Pipe manifold at port b";
  Buildings.Fluid.HeatExchangers.BaseClasses.DuctManifoldNoResistance ducMan_b(
    redeclare package Medium = Medium2,
    final nPipPar=nPipPar,
    final nPipSeg=nPipSeg,
    final mStart_flow_a=-mStart_flow_a2,
    final allowFlowReversal=allowFlowReversal2) "Duct manifold at port b";
  Buildings.Fluid.HeatExchangers.BaseClasses.DuctManifoldFixedResistance
    ducMan_a(
    redeclare package Medium = Medium2,
    final nPipPar = nPipPar,
    final nPipSeg = nPipSeg,
    final m_flow_nominal=m2_flow_nominal,
    final dp_nominal=dp2_nominal,
    final dh=dh2,
    final ReC=ReC_2,
    final dl=dl,
    final mStart_flow_a=mStart_flow_a2,
    final linearized=linearizeFlowResistance2,
    final use_dh=use_dh2,
    final deltaM=deltaM2,
    final from_dp=from_dp2,
    final allowFlowReversal=allowFlowReversal2,
    final energyDynamics=ductConnectionDynamics) "Duct manifold at port a";
public 
  parameter Modelica.SIunits.Length dh1=0.025 
    "Hydraulic diameter for a single pipe";
  parameter Real ReC_1=4000 
    "Reynolds number where transition to turbulent starts inside pipes";
  parameter Real ReC_2=4000 
    "Reynolds number where transition to turbulent starts inside ducts";
  parameter Modelica.SIunits.MassFlowRate m1_flow_nominal 
    "Mass flow rate at port_a1 for all pipes";
  parameter Modelica.SIunits.Length dh2=1 "Hydraulic diameter for duct";
  Modelica.SIunits.HeatFlowRate Q1_flow 
    "Heat transfered from solid into medium 1";
  Modelica.SIunits.HeatFlowRate Q2_flow 
    "Heat transfered from solid into medium 2";
  parameter Modelica.SIunits.Time tau1=20 
    "Time constant at nominal flow for medium 1";
  parameter Modelica.SIunits.Time tau2=1 
    "Time constant at nominal flow for medium 2";
  parameter Modelica.SIunits.Time tau_m=20 
    "Time constant of metal at nominal UA value";

protected 
  BaseClasses.CoilHeader hea1[nReg/2](
      redeclare each final package Medium = Medium1,
      each final nPipPar = nPipPar,
      each final mStart_flow_a=mStart_flow_a1,
      each allowFlowReversal=allowFlowReversal1) if 
      nReg > 1 "Pipe header to redirect flow into next register";
  BaseClasses.CoilHeader hea2[nReg/2-1](
      redeclare each final package Medium = Medium1,
      each final nPipPar = nPipPar,
      each final mStart_flow_a=mStart_flow_a1,
      each allowFlowReversal=allowFlowReversal1) if 
      nReg > 2 "Pipe header to redirect flow into next register";
  Modelica.Blocks.Math.Gain gai_1(k=1/nReg) 
    "Gain medium-side 1 to take discretization into account";
  Modelica.Blocks.Math.Gain gai_2(k=1/nReg) 
    "Gain medium-side 2 to take discretization into account";
public 
  parameter Boolean waterSideFlowDependent = false 
    "Set to false to make water-side hA independent of mass flow rate";
  parameter Boolean airSideFlowDependent = false 
    "Set to false to make air-side hA independent of mass flow rate";
  parameter Boolean waterSideTemperatureDependent = false 
    "Set to false to make water-side hA independent of temperature";
  constant Boolean airSideTemperatureDependent = false 
    "Set to false to make air-side hA independent of temperature";
  BaseClasses.HADryCoil hA(
    final UA_nominal=UA_nominal,
    final m_flow_nominal_a=m2_flow_nominal,
    final m_flow_nominal_w=m1_flow_nominal,
    final waterSideTemperatureDependent=waterSideTemperatureDependent,
    final waterSideFlowDependent=waterSideFlowDependent,
    final airSideTemperatureDependent=airSideTemperatureDependent,
    final airSideFlowDependent=airSideFlowDependent) 
    "Model for convective heat transfer coefficient";
protected 
  constant Boolean allowCondensation = false 
    "Set to false to compute sensible heat transfer only";

protected 
  Buildings.Fluid.Sensors.TemperatureTwoPort temSen_1(
                                              redeclare package Medium = 
        Medium1) "Temperature sensor";
  Buildings.Fluid.Sensors.MassFlowRate masFloSen_1(redeclare package Medium = 
        Medium1) "Mass flow rate sensor";
  Buildings.Fluid.Sensors.TemperatureTwoPort temSen_2(
                                              redeclare package Medium = 
        Medium2) "Temperature sensor";
  Buildings.Fluid.Sensors.MassFlowRate masFloSen_2(redeclare package Medium = 
        Medium2) "Mass flow rate sensor";
public 
  parameter Modelica.Fluid.Types.Dynamics ductConnectionDynamics=
    Modelica.Fluid.Types.Dynamics.DynamicFreeInitial 
    "Default formulation of energy balances for duct connection";
  parameter Modelica.SIunits.Length dl=0.3 
    "Length of mixing volume for duct connection";
  parameter Modelica.SIunits.MassFlowRate mStart_flow_a1=m1_flow_nominal 
    "Guess value for mass flow rate at port_a1";
  parameter Modelica.SIunits.MassFlowRate mStart_flow_a2=m2_flow_nominal 
    "Guess value for mass flow rate at port_a2";
initial equation 
  assert(dT_nominal>0,     "Parameter dT_nominal is negative. Check heat exchanger parameters.");
  assert(Q_flow_nominal>0, "Parameter Q_flow_nominal is negative. Check heat exchanger parameters.");
equation 
  Q1_flow = sum(hexReg[i].Q1_flow for i in 1:nReg);
  Q2_flow = sum(hexReg[i].Q2_flow for i in 1:nReg);

  // air stream connections
  for i in 2:nReg loop
    connect(hexReg[i].port_a2, hexReg[i-1].port_b2);
  end for;
  connect(ducMan_a.port_b, hexReg[1].port_a2);
  connect(hexReg[nReg].port_b2, ducMan_b.port_b);
  connect(pipMan_a.port_b, hexReg[1].port_a1);
  connect(hexReg[nReg].port_b1, pipMan_b.port_b);
  connect(pipMan_b.port_a, port_b1);
  connect(ducMan_b.port_a, port_b2);
  for i in 1:2:nReg loop

  // header after first hex register
    connect(hexReg[i].port_b1, hea1[(i+1)/2].port_a);
    connect(hea1[(i+1)/2].port_b, hexReg[i+1].port_b1);
  end for;
  // header after 2nd hex register
  for i in 2:2:(nReg-1) loop
    connect(hexReg[i].port_a1, hea2[i/2].port_a);
    connect(hea2[i/2].port_b, hexReg[i+1].port_a1);
  end for;
  connect(masFloSen_1.m_flow, hA.m1_flow);
  connect(port_a2, masFloSen_2.port_a);
  connect(masFloSen_2.port_b, temSen_2.port_a);
  connect(temSen_2.port_b, ducMan_a.port_a);
  connect(temSen_2.T, hA.T_2);
  connect(masFloSen_2.m_flow, hA.m2_flow);
  connect(hA.hA_1, gai_1.u);
  connect(hA.hA_2, gai_2.u);
  for i in 1:nReg loop
    connect(gai_1.y, hexReg[i].Gc_1);
    connect(gai_2.y, hexReg[i].Gc_2);
  end for;
  connect(port_a1, masFloSen_1.port_a);
  connect(masFloSen_1.port_b, temSen_1.port_a);
  connect(temSen_1.port_b, pipMan_a.port_a);
  connect(temSen_1.T, hA.T_1);
end DryCoilDiscretized;

Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed

Heater or cooler with prescribed heat flow rate

Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed

Information

Model for an ideal heater or cooler with prescribed heat flow rate to the medium.

This model adds heat in the amount of Q_flow = u Q_flow_nominal to the medium. The input signal u and the nominal heat flow rate Q_flow_nominal can be positive or negative.

Note that for non-zero Q_flow, if the mass flow rate tends to zero, the temperature difference over this component tends to infinity. Hence, using a proper control for u is essential when using this component.

Extends from Fluid.Interfaces.PartialStaticTwoPortHeatMassTransfer (Partial model transporting fluid between two ports without storing mass or energy), Buildings.BaseClasses.BaseIcon (Base icon).

Parameters

Type Name Default Description

replaceable package Medium PartialMedium Medium in the component

HeatFlowRate Q_flow_nominal Heat flow rate at u=1, positive for heating [W]

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	Default	Description
replaceable package Medium	PartialMedium	Medium in the component
HeatFlowRate	Q_flow_nominal		Heat flow rate at u=1, positive for heating [W]
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

Connectors

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 u Control input

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	u	Control input

Modelica definition

model HeaterCoolerPrescribed 
  "Heater or cooler with prescribed heat flow rate"
  extends Fluid.Interfaces.PartialStaticTwoPortHeatMassTransfer;
  extends Buildings.BaseClasses.BaseIcon;

  parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal 
    "Heat flow rate at u=1, positive for heating";
  Modelica.Blocks.Interfaces.RealInput u "Control input";
equation 
  Q_flow = Q_flow_nominal * u;
  mXi_flow = zeros(Medium.nXi); // no mass added or removed (sensible heat only)
end HeaterCoolerPrescribed;

Buildings.Fluid.HeatExchangers.WetCoilDiscretized

Coil with discretization along the flow paths and humidity condensation

Buildings.Fluid.HeatExchangers.WetCoilDiscretized

Information

Model of a discretized coil with humidity condensation. This model is identical to Buildings.Fluid.HeatExchangers.DryCoilDiscretized but in addition, the mass transfer from fluid 2 to the metal is computed. The mass transfer is computed using a similarity law between heat and mass transfer, as implemented by the model Buildings.Fluid.HeatExchangers.BaseClasses.MassExchange. See this model for details.

This model can only be used with medium models that implement the function enthalpyOfLiquid and that contain an integer variable Water whose value is the element number where the water vapor is stored in the species concentration vector. Examples for such media are Buildings.Media.PerfectGases.MoistAir and Modelica.Media.Air.MoistAir.

Extends from DryCoilDiscretized (Coil with discretization along the flow paths and no humidity condensation).

Parameters

Type Name Default Description

replaceable package Medium1 PartialMedium Medium 1 in the component

replaceable package Medium2 PartialMedium Medium 2 in the component

Nominal condition

MassFlowRate m1_flow_nominal Nominal mass flow rate [kg/s]

MassFlowRate m2_flow_nominal m1_flow_nominal Nominal mass flow rate [kg/s]

Pressure dp1_nominal Pressure [Pa]

Pressure dp2_nominal Pressure [Pa]

TemperatureDifference dT_nominal 10 Temperature difference [K]

HeatFlowRate Q_flow_nominal 1000 Heat transfer at dT_nominal [W]

ThermalConductance UA_nominal Q_flow_nominal/dT_nominal Thermal conductance at nominal flow, used to compute heat capacity [W/K]

Time tau1 20 Time constant at nominal flow for medium 1 [s]

Time tau2 1 Time constant at nominal flow for medium 2 [s]

Time tau_m 20 Time constant of metal at nominal UA value [s]

Initialization

MassFlowRate m1_flow.start 0 Mass flow rate from port_a1 to port_b1 (m1_flow > 0 is design flow direction) [kg/s]

Pressure dp1.start 0 Pressure difference between port_a1 and port_b1 [Pa]

MassFlowRate m2_flow.start 0 Mass flow rate from port_a2 to port_b2 (m2_flow > 0 is design flow direction) [kg/s]

Pressure dp2.start 0 Pressure difference between port_a2 and port_b2 [Pa]

MassFlowRate mStart_flow_a1 m1_flow_nominal Guess value for mass flow rate at port_a1 [kg/s]

MassFlowRate mStart_flow_a2 m2_flow_nominal Guess value for mass flow rate at port_a2 [kg/s]

Geometry

Integer nReg 2 Number of registers

Integer nPipPar 3 Number of parallel pipes in each register

Integer nPipSeg 4 Number of pipe segments per register used for discretization

Length dh1 0.025 Hydraulic diameter for a single pipe [m]

Length dh2 1 Hydraulic diameter for duct [m]

Assumptions

Boolean allowFlowReversal1 system.allowFlowReversal = true to allow flow reversal in medium 1, false restricts to design direction (port_a -> port_b)

Boolean allowFlowReversal2 system.allowFlowReversal = true to allow flow reversal in medium 2, false restricts to design direction (port_a -> port_b)

Dynamics

Dynamics energyDynamics1 Modelica.Fluid.Types.Dynamic... Default formulation of energy balances for volume 1

Dynamics energyDynamics2 Modelica.Fluid.Types.Dynamic... Default formulation of energy balances for volume 2

Dynamics ductConnectionDynamics Modelica.Fluid.Types.Dynamic... Default formulation of energy balances for duct connection

Length dl 0.3 Length of mixing volume for duct connection [m]

Advanced

MassFlowRate m1_flow_small 1E-4*m1_flow_nominal Small mass flow rate for regularization of zero flow [kg/s]

MassFlowRate m2_flow_small 1E-4*m2_flow_nominal Small mass flow rate for regularization of zero flow [kg/s]

Boolean use_dh1 false Set to true to specify hydraulic diameter for pipe pressure drop

Boolean use_dh2 false Set to true to specify hydraulic diameter for duct pressure drop)

Real ReC_1 4000 Reynolds number where transition to turbulent starts inside pipes

Real ReC_2 4000 Reynolds number where transition to turbulent starts inside ducts

Diagnostics

Boolean show_V_flow true = true, if volume flow rate at inflowing port is computed

Initialization

AbsolutePressure p_a1_start system.p_start Guess value for inlet pressure [Pa]

AbsolutePressure p_b1_start p_a1_start Guess value for outlet pressure [Pa]

AbsolutePressure p_a2_start system.p_start Guess value for inlet pressure [Pa]

AbsolutePressure p_b2_start p_a2_start Guess value for outlet pressure [Pa]

Flow resistance

Medium 1

Boolean from_dp1 false = true, use m_flow = f(dp) else dp = f(m_flow)

Boolean linearizeFlowResistance1 false = true, use linear relation between m_flow and dp for any flow rate

Real deltaM1 0.1 Fraction of nominal flow rate where flow transitions to laminar

Medium 2

Boolean from_dp2 false = true, use m_flow = f(dp) else dp = f(m_flow)

Boolean linearizeFlowResistance2 false = true, use linear relation between m_flow and dp for any flow rate

Real deltaM2 0.1 Fraction of nominal flow rate where flow transitions to laminar

Heat transfer

Boolean waterSideFlowDependent false Set to false to make water-side hA independent of mass flow rate

Boolean airSideFlowDependent false Set to false to make air-side hA independent of mass flow rate

Boolean waterSideTemperatureDependent false Set to false to make water-side hA independent of temperature

Type	Name	Default	Description
replaceable package Medium1	PartialMedium	Medium 1 in the component
replaceable package Medium2	PartialMedium	Medium 2 in the component
Nominal condition
MassFlowRate	m1_flow_nominal		Nominal mass flow rate [kg/s]
MassFlowRate	m2_flow_nominal	m1_flow_nominal	Nominal mass flow rate [kg/s]
Pressure	dp1_nominal		Pressure [Pa]
Pressure	dp2_nominal		Pressure [Pa]
TemperatureDifference	dT_nominal	10	Temperature difference [K]
HeatFlowRate	Q_flow_nominal	1000	Heat transfer at dT_nominal [W]
ThermalConductance	UA_nominal	Q_flow_nominal/dT_nominal	Thermal conductance at nominal flow, used to compute heat capacity [W/K]
Time	tau1	20	Time constant at nominal flow for medium 1 [s]
Time	tau2	1	Time constant at nominal flow for medium 2 [s]
Time	tau_m	20	Time constant of metal at nominal UA value [s]
Initialization
MassFlowRate	m1_flow.start	0	Mass flow rate from port_a1 to port_b1 (m1_flow > 0 is design flow direction) [kg/s]
Pressure	dp1.start	0	Pressure difference between port_a1 and port_b1 [Pa]
MassFlowRate	m2_flow.start	0	Mass flow rate from port_a2 to port_b2 (m2_flow > 0 is design flow direction) [kg/s]
Pressure	dp2.start	0	Pressure difference between port_a2 and port_b2 [Pa]
MassFlowRate	mStart_flow_a1	m1_flow_nominal	Guess value for mass flow rate at port_a1 [kg/s]
MassFlowRate	mStart_flow_a2	m2_flow_nominal	Guess value for mass flow rate at port_a2 [kg/s]
Geometry
Integer	nReg	2	Number of registers
Integer	nPipPar	3	Number of parallel pipes in each register
Integer	nPipSeg	4	Number of pipe segments per register used for discretization
Length	dh1	0.025	Hydraulic diameter for a single pipe [m]
Length	dh2	1	Hydraulic diameter for duct [m]
Assumptions
Boolean	allowFlowReversal1	system.allowFlowReversal	= true to allow flow reversal in medium 1, false restricts to design direction (port_a -> port_b)
Boolean	allowFlowReversal2	system.allowFlowReversal	= true to allow flow reversal in medium 2, false restricts to design direction (port_a -> port_b)
Dynamics
Dynamics	energyDynamics1	Modelica.Fluid.Types.Dynamic...	Default formulation of energy balances for volume 1
Dynamics	energyDynamics2	Modelica.Fluid.Types.Dynamic...	Default formulation of energy balances for volume 2
Dynamics	ductConnectionDynamics	Modelica.Fluid.Types.Dynamic...	Default formulation of energy balances for duct connection
Length	dl	0.3	Length of mixing volume for duct connection [m]
Advanced
MassFlowRate	m1_flow_small	1E-4*m1_flow_nominal	Small mass flow rate for regularization of zero flow [kg/s]
MassFlowRate	m2_flow_small	1E-4*m2_flow_nominal	Small mass flow rate for regularization of zero flow [kg/s]
Boolean	use_dh1	false	Set to true to specify hydraulic diameter for pipe pressure drop
Boolean	use_dh2	false	Set to true to specify hydraulic diameter for duct pressure drop)
Real	ReC_1	4000	Reynolds number where transition to turbulent starts inside pipes
Real	ReC_2	4000	Reynolds number where transition to turbulent starts inside ducts
Diagnostics
Boolean	show_V_flow	true	= true, if volume flow rate at inflowing port is computed
Initialization
AbsolutePressure	p_a1_start	system.p_start	Guess value for inlet pressure [Pa]
AbsolutePressure	p_b1_start	p_a1_start	Guess value for outlet pressure [Pa]
AbsolutePressure	p_a2_start	system.p_start	Guess value for inlet pressure [Pa]
AbsolutePressure	p_b2_start	p_a2_start	Guess value for outlet pressure [Pa]
Flow resistance
Medium 1
Boolean	from_dp1	false	= true, use m_flow = f(dp) else dp = f(m_flow)
Boolean	linearizeFlowResistance1	false	= true, use linear relation between m_flow and dp for any flow rate
Real	deltaM1	0.1	Fraction of nominal flow rate where flow transitions to laminar
Medium 2
Boolean	from_dp2	false	= true, use m_flow = f(dp) else dp = f(m_flow)
Boolean	linearizeFlowResistance2	false	= true, use linear relation between m_flow and dp for any flow rate
Real	deltaM2	0.1	Fraction of nominal flow rate where flow transitions to laminar
Heat transfer
Boolean	waterSideFlowDependent	false	Set to false to make water-side hA independent of mass flow rate
Boolean	airSideFlowDependent	false	Set to false to make air-side hA independent of mass flow rate
Boolean	waterSideTemperatureDependent	false	Set to false to make water-side hA independent of temperature

Connectors

Type	Name	Description
FluidPort_a	port_a1	Fluid connector a1 (positive design flow direction is from port_a1 to port_b1)
FluidPort_b	port_b1	Fluid connector b1 (positive design flow direction is from port_a1 to port_b1)
FluidPort_a	port_a2	Fluid connector a2 (positive design flow direction is from port_a2 to port_b2)
FluidPort_b	port_b2	Fluid connector b2 (positive design flow direction is from port_a2 to port_b2)

Modelica definition

model WetCoilDiscretized 
  "Coil with discretization along the flow paths and humidity condensation"
  // When replacing the volume, the Medium is constrained so that the enthalpyOfLiquid
  // function is known. Otherwise, checkModel(...) will fail
  extends DryCoilDiscretized(final allowCondensation=true,
  each hexReg(ele(redeclare each Buildings.Fluid.MixingVolumes.MixingVolumeMoistAir
          vol2(
          final use_HeatTransfer = true,
          medium(T(stateSelect=StateSelect.never))))));

end WetCoilDiscretized;

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