modelBaseModelStaticHeatPump
Information
This model prescribes inlet and outlet conditions of a simplified static heat pump model (i.e. boundary conditions of the secondary sides of the evaporator and condenser). Furhtermore, it prescribes the rotational speed of the compressor. The model is used to validate the compressor model in general as well as to identify effects of different static boundary conditions (e.g. pinch temperature of the evaporator).
Required information
The User needs to define the following information in order to complete the model:
- Basic definitions of the compressor. For example, the displacement volume.
- Calculation approaches of the three efficiencies of the compressor.
- Static boundaries of the heat pump obtained, for example, by experimental data.
To add static boundary conditions, a combi time table is included within the model. The columns are defined as follows:
- Time steps (0,1,2,3,...).
- Rotational speed in
Hz. - Ambient temperature in
°C. - Heat capacity in
W. - Temperature at inlet of condenser's secondary fluid in
°C. - Power consumption in
kW. - COP.
Moreover, the User needs to define further parameters describing static condtions of the heat pump. These parameters are listed below.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| General › Compressors | |||
| Integer | nCom | 1 | Numer of compressors in parallel |
| General › Evaporator | |||
| Modelica.Units.SI.TemperatureDifference | dTPinEva | 5 | Pinch temperature at evaporator's outlet |
| Modelica.Units.SI.TemperatureDifference | dTSupHea | 1 | Superheating of working fluid |
| General › Condenser | |||
| Modelica.Units.SI.TemperatureDifference | dTPinCon | 2.5 | Pinch temperature at evaporator's outlet |
| Modelica.Units.SI.TemperatureDifference | dTSubCool | 8 | Supercooling of working fluid |
| Modelica.Units.SI.Density | dSec | 1000 | Constant density of secondary fluid |
| Modelica.Units.SI.SpecificHeatCapacity | cpSec | 4.1813e3 | Constant specific heat capacity of secondary fluid |
| Modelica.Units.SI.VolumeFlowRate | V_flowSec | (0.776 + 0.781 + 0.44)/3/3600 | Constant volume flow of secondary fluid |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Sources.CombiTimeTable | inpDat | Static boundaries of compressor model | |
| Modelica.Blocks.Sources.RealExpression | inpRotSpe | Expressions describing rotational speed | |
| Modelica.Blocks.Sources.RealExpression | inpAmbTemp | Expressions describing ambient temperature | |
| Modelica.Blocks.Sources.RealExpression | inpHeaCap | Expressions describing heat capacity | |
| Modelica.Blocks.Sources.RealExpression | inpTRetFlo | Expressions describing return flow temperature at heat capacity | |
| Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature | ambTemp | Source that prescribes boundary ambient temperature | |
| Modelica.Thermal.HeatTransfer.Components.ThermalCollector | thrCol | Model to split the ambient temperature | |
| StaticEvaporator | eva | Model that describes a simple static evaporator | |
| Modelica.Blocks.Routing.Replicator | repMea | Replicating the current value of the manipulated variables | |
| ModularCompressors.ModularCompressorsSensors | modCom | Model that describes modular compressors in parallel | |
| StaticCondenser | con | Model that describes a simple static condenser | |
| Controls.Interfaces.ModularHeatPumpControlBus | dataBus | Connector that contains all control signals | |
| Modelica.Blocks.Interaction.Show.RealValue | COP | Real value describing current COP | |
| Modelica.Blocks.Interaction.Show.RealValue | dCOPRel | Realative difference of current COP | |
| Modelica.Blocks.Interaction.Show.RealValue | PEle | Real value describing current power consumption | |
| Modelica.Blocks.Interaction.Show.RealValue | dPEleRel | Real difference of current power consumption | |
| Real | inpTime | time | Simulation time |
Contents
| Name | Description |
|---|---|
| Medium | |
| StaticEvaporatorprotected | Static evaporator assuming constant pinch point at evaporator's outlet |
| StaticCondenserprotected | Static condenser assuming constant pinch point at condenser's outlet |
Revisions
- December 16, 2017, by Mirko Engelpracht:
First implementation (see issue 467).