modelPartialCompressor

Partial compressor model

Information

This is the base class for the compressor model.

The model evaluates the evaporating pressure of the refrigerant p_eva, the specific enthalpy of the evaporating saturated refrigerant vapor h_eva, the condensing pressure of the refrigerant p_con and the specific enthalpy of the condensing saturated liquid refrigerant h_cond at the evaporating temperature T_eva = port_a.T and condensing temperature T_con = port_b.T.

Thermodynamic properties are evaluated from functions contained in the specified refrigerant package.

Assumptions and limitations

The model assumes isothermal condensation and evaporation, therefore refrigerant mass flow is not accounted for and heat ports are used instead of fluid ports.

Connectors

Type	Name	Description
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a	port_a	Refrigerant connector a (corresponding to the evaporator)
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b	port_b	Refrigerant connector b (corresponding to the condenser)
Modelica.Blocks.Interfaces.RealInput	y	Modulating signal for compressor frequency, equal to 1 at full load conditions
Modelica.Blocks.Interfaces.RealOutput	P	Electric power consumed by compressor

Components

Type	Name	Description
Modelica.Units.SI.SpecificEnthalpy	hEva	Specific enthalpy of saturated vapor at evaporator temperature
Modelica.Units.SI.SpecificEnthalpy	hCon	Specific enthalpy of saturated liquid at condenser temperature
Modelica.Units.SI.AbsolutePressure	pEva	Pressure of saturated vapor at evaporator temperature
Modelica.Units.SI.AbsolutePressure	pCon	Pressure of saturated liquid at condenser temperature
Modelica.Units.SI.AbsolutePressure	pDis	Discharge pressure of the compressor
Modelica.Units.SI.AbsolutePressure	pSuc	Suction pressure of the compressor
Modelica.Units.SI.Temperature	TSuc	Temperature at suction of the compressor
Boolean	isOn	State of the compressor, true if turned on
Modelica.Units.SI.SpecificVolume	vSuc	Specific volume of the refrigerant at suction of the compressor

Name	Description
ref	Refrigerant in the component

Revisions

May 30, 2017, by Filip Jorissen:
Removed pressure_error as this is replaced by AixLib.Fluid.HeatPumps.Compressors.BaseClasses.TemperatureProtection. See #769.
May 26, 2017, by Michael Wetter and Thierry Nouidui:
Reformulated isOn to use the same construct as the hysteresis block, and to work around a JModelica limitation.
This is for #774.
April 25, 2017, by Michael Wetter:
Reformulated when conditions and moved common assignments to this base class.
This is for #739.
November 11, 2016, by Massimo Cimmino:
First implementation of this base class.