Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.BaseClasses

Information

This package contains performance curves for the cooling capacity and the EIR of DX cooling coils. For performance data of specific DX cooling coils, see the packages Buildings.Fluid.HeatExchangers.DXCoils.Data.SingleSpeed and Buildings.Fluid.HeatExchangers.DXCoils.Data.DoubleSpeed.

The data are described in Buildings.Fluid.HeatExchangers.DXCoils.Data.BaseClasses.DXCoil.

Extends from Modelica.Icons.BasesPackage (Icon for packages containing base classes).

Package Content

Name	Description
Stage	Generic data record for a stage of a DX coil
NominalValues	Data record of nominal values
PerformanceCurve	Data record for a performance curve
nominalValuesToString	Converts the nominal values to a string representation

Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.BaseClasses.Stage

Information

This is the base record for DX cooling coil model at a compressor speed. See the information section of Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.DXCoil for a description of the data.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

Type	Name	Default	Description
AngularVelocity	spe		Rotational speed [rad/s]
NominalValues	nomVal		Nominal values
PerformanceCurve	perCur		Performance curves for this stage

Modelica definition

record Stage "Generic data record for a stage of a DX coil"
  extends Modelica.Icons.Record;

  parameter Modelica.SIunits.AngularVelocity spe(displayUnit="1/min") 
    "Rotational speed";
  parameter Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.BaseClasses.NominalValues
    nomVal "Nominal values";
  parameter Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.BaseClasses.PerformanceCurve
    perCur "Performance curves for this stage";
end Stage;

Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.BaseClasses.NominalValues

Information

This is the base record of nominal values for DX cooling coil models.

See the information section of Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.DXCoil for a description of the data.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

Type	Name	Default	Description
Nominal condition
HeatFlowRate	Q_flow_nominal		Nominal cooling capacity (negative number) [W]
Real	COP_nominal		Nominal coefficient of performance
Real	SHR_nominal		Nominal sensible heat ratio
MassFlowRate	m_flow_nominal		Nominal air mass flow rate [kg/s]
Temperature	TEvaIn_nominal	273.15 + 19.4	Evaporator entering air dry-bulb temperature at rating condition [K]
Temperature	TConIn_nominal	308.15	Condenser entering air temperature at rating condition (wet bulb for evaporative cooled coils, dry bulb otherwise) [K]
Pressure	p_nominal	101325	Atmospheric pressure [Pa]
Nominal
Real	phiIn_nominal	0.5	Relative humidity of entering air at nominal condition
Re-evaporation data
Time	tWet	1400	Time until moisture drips from coil when a dry coil is switched on [s]
Real	gamma	1.5	Ratio of evaporation heat transfer divided by latent heat transfer at nominal conditions

Modelica definition

record NominalValues "Data record of nominal values"
  extends Modelica.Icons.Record;

//-----------------------------Nominal conditions-----------------------------//
  parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal(max=0) 
    "Nominal cooling capacity (negative number)";
  parameter Real COP_nominal "Nominal coefficient of performance";
  parameter Real SHR_nominal "Nominal sensible heat ratio";
  parameter Modelica.SIunits.MassFlowRate m_flow_nominal 
    "Nominal air mass flow rate";

  parameter Modelica.SIunits.Temperature TEvaIn_nominal=273.15+19.4 
    "Evaporator entering air dry-bulb temperature at rating condition";

  parameter Modelica.SIunits.Temperature TConIn_nominal=308.15 
    "Condenser entering air temperature at rating condition (wet bulb for evaporative cooled coils, dry bulb otherwise)";

  parameter Real phiIn_nominal=0.5 
    "Relative humidity of entering air at nominal condition";
  parameter Modelica.SIunits.Pressure p_nominal=101325 "Atmospheric pressure";

  parameter Modelica.SIunits.Time tWet = 1400 
    "Time until moisture drips from coil when a dry coil is switched on";
  parameter Real gamma(min=0) = 1.5 
    "Ratio of evaporation heat transfer divided by latent heat transfer at nominal conditions";

end NominalValues;

Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.BaseClasses.PerformanceCurve

Information

This record declares the data used to specify performance curves for DX coils.

See the information section of Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.DXCoil for a description of the data.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

Type	Name	Default	Description
Performance curves
Real	capFunT[6]		Biquadratic coefficients for cooling capacity function of temperature
Real	capFunFF[:]		Polynomial coefficients for cooling capacity function of flow fration
Real	EIRFunT[6]		Biquadratic coefficients for EIR function of temperature
Real	EIRFunFF[:]		Polynomial coefficients for EIR function of flow fration
Minimum and maximum values
Temperature	TConInMin		Minimum condenser inlet temperature for cooling capacity function [K]
Temperature	TConInMax		Maximum condenser inlet temperature for cooling capacity function [K]
Temperature	TEvaInMin		Minimum evaporator inlet temperature for cooling capacity function [K]
Temperature	TEvaInMax		Maximum evaporator inlet temperature for cooling capacity function [K]
Real	ffMin		Minimum flow fraction for which performance data are valid
Real	ffMax		Maximum flow fraction for which performance data are valid

Modelica definition

record PerformanceCurve "Data record for a performance curve"
  extends Modelica.Icons.Record;
//-----------------------------Performance curves-----------------------------//
  parameter Real  capFunT[6] 
    "Biquadratic coefficients for cooling capacity function of temperature";
  parameter Real  capFunFF[:] 
    "Polynomial coefficients for cooling capacity function of flow fration";
  parameter Real  EIRFunT[6] 
    "Biquadratic coefficients for EIR function of temperature";
  parameter Real  EIRFunFF[:] 
    "Polynomial coefficients for EIR function of flow fration";
//------------------------Range for performance curves------------------------//
  parameter Modelica.SIunits.Temperature   TConInMin 
    "Minimum condenser inlet temperature for cooling capacity function";
  parameter Modelica.SIunits.Temperature   TConInMax 
    "Maximum condenser inlet temperature for cooling capacity function";
  parameter Modelica.SIunits.Temperature   TEvaInMin 
    "Minimum evaporator inlet temperature for cooling capacity function";
  parameter Modelica.SIunits.Temperature   TEvaInMax 
    "Maximum evaporator inlet temperature for cooling capacity function";

  parameter Real  ffMin 
    "Minimum flow fraction for which performance data are valid";
  parameter Real  ffMax 
    "Maximum flow fraction for which performance data are valid";

end PerformanceCurve;

Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.BaseClasses.nominalValuesToString

Information

Returns a string representation of the nominal values.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Default	Description
NominalValues	nomVal		Nominal values

Outputs

Type	Name	Description
String	s	A string representation of the nominal values

Modelica definition

function nominalValuesToString 
  "Converts the nominal values to a string representation"
  extends Modelica.Icons.Function;
  input Buildings.Fluid.HeatExchangers.DXCoils.Data.Generic.BaseClasses.NominalValues
    nomVal "Nominal values";
  output String s "A string representation of the nominal values";
algorithm 
 s :="Nominal values:
    Q_flow_nominal = " + String(nomVal.Q_flow_nominal) + "
    COP_nominal    = " + String(nomVal.COP_nominal) + "
    m_flow_nominal = " + String(nomVal.m_flow_nominal) + "
    TEvaIn_nominal = " + String(nomVal.TEvaIn_nominal) + " (= " + String(nomVal.TEvaIn_nominal-273.15) + " degC)
    TConIn_nominal = " + String(nomVal.TConIn_nominal) + " (= " + String(nomVal.TConIn_nominal-273.15) + " degC)
    phiIn_nominal  = " + String(nomVal.phiIn_nominal) + "
    tWet           = " + String(nomVal.tWet) + "
    gamma          = " + String(nomVal.gamma) + "
    p_nominal      = " + String(nomVal.p_nominal) + "
";

end nominalValuesToString;