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

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

Package with base classes for performance data

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

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

Converts the nominal values to a string representation

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;

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

Data record of nominal values

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

Data record for a performance curve

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	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.Stage

Generic data record for a stage of a DX coil

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	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;

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