modelTableData4DdTeva
4D data: condenser temperature, evaporator temperature, compressor speed, evaporator dT
Extends from AixLib.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.BaseClasses.PartialHeatPumpTableDataND (Partial model with components for TableDataND approach for heat pumps).
Information
This model uses four-dimensional table data estimated using tools, such as VCLibPy, to calculate QCon_flow and PEle. In addition to AixLib.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.TableData3D, this model uses the secondary side's temperature spread at the evaporator to estimate efficiency and power. This is mainly relevant for heat pumps with large temperature difference over the heat source such asfor example exhaust air heat pumps due to limited exhaust air flow.
Note that losses are often implicitly included in measured data. In this case, the frosting modules should be disabled.
Scaling factor
For the scaling factor, the table data for condenser heat flow rate (QConTabDat_flow) is evaluated at nominal conditions. Hence, the scaling factor is
scaFac = QCon_flow_nominal/QConTabDat_flow(TCon_nominal, TEva_nominal, y_nominal, dTEva_nominal).
Using scaFac, the table data is scaled linearly. This implies a constant COP over different design sizes:
QCon_flow = scaFac * tabQCon_flow.y
PEle = scaFac * tabPel.y
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| String | devIde (from PartialRefrigerantCycle) | "" | Indicates the data source, used to warn users about different vapor compression devices in reversible models |
| Boolean | useInHeaPum (from PartialHeatPumpCycle) | =false to indicate that this model is used in a chiller | |
| Integer | nDim (from PartialTableDataSDF) | Number of input dimensions | |
| Real | scaFac (from PartialTableDataSDF) | Scaling factor | |
| AixLib.Fluid.HeatPumps.ModularReversible.Data.TableDataSDF.GenericHeatPump | datTab (from PartialHeatPumpTableDataND) | ||
| Modelica.Units.SI.TemperatureDifference | dTEva_nominal | 10 | Nominal evaporator temperature difference to calculate scaling factor |
| Nominal condition | |||
| Modelica.Units.SI.Power | PEle_nominal (from PartialRefrigerantCycle) | Nominal electrical power consumption | |
| Modelica.Units.SI.Temperature | TCon_nominal (from PartialRefrigerantCycle) | Nominal temperature at secondary condenser side | |
| Modelica.Units.SI.Temperature | TEva_nominal (from PartialRefrigerantCycle) | Nominal temperature at secondary evaporator side | |
| Modelica.Units.SI.HeatFlowRate | QHea_flow_nominal (from PartialHeatPumpCycle) | Nominal heating capacity | |
| Modelica.Units.SI.HeatFlowRate | QHeaNoSca_flow_nominal (from PartialHeatPumpTableDataND) | evaluate(extTabQUse_flow, uOrdSca_nominal, interpMethod, extrapMethod) | Unscaled nominal heating capacity |
| Real | y_nominal | 1 | Nominal compressor speed |
| Advanced › Medium properties | |||
| Modelica.Units.SI.SpecificHeatCapacity | cpCon (from PartialRefrigerantCycle) | Evaporator medium specific heat capacity | |
| Modelica.Units.SI.SpecificHeatCapacity | cpEva (from PartialRefrigerantCycle) | Evaporator medium specific heat capacity | |
| Data handling | |||
| SDF.Types.InterpolationMethod | interpMethod (from PartialTableDataSDF) | SDF.Types.InterpolationMethod.Linear | Interpolation method |
| SDF.Types.ExtrapolationMethod | extrapMethod (from PartialTableDataSDF) | SDF.Types.ExtrapolationMethod.Hold | Extrapolation method |
| Extra states | |||
| Boolean | useExtSta (from PartialTableDataSDF) | false | =true to output extra states stored in sdf file |
| Integer | nExtSta (from PartialTableDataSDF) | 1 | |
| String[nExtSta] | datasetExt (from PartialTableDataSDF) | {"p_1"} | Dataset names for extra states |
| String[nExtSta] | dataUnitExt (from PartialTableDataSDF) | {"Pa"} | Data unit for extra states |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealOutput | PEle (from PartialRefrigerantCycle) | Electrical Power consumed by the device | |
| Modelica.Blocks.Interfaces.RealOutput | QCon_flow (from PartialRefrigerantCycle) | Heat flow rate through condenser | |
| AixLib.Fluid.HeatPumps.ModularReversible.BaseClasses.RefrigerantMachineControlBus | sigBus (from PartialRefrigerantCycle) | Bus-connector | |
| Modelica.Blocks.Interfaces.RealOutput | QEva_flow (from PartialRefrigerantCycle) | Heat flow rate through evaporator |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| AixLib.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.Frosting.NoFrosting | iceFacCal (from PartialRefrigerantCycle) | ||
| Modelica.Blocks.Math.Add | redQCon (from PartialRefrigerantCycle) | Reduce heat flow to the condenser based on the reduction to the evaporator | |
| Modelica.Blocks.Math.Product | proRedQEva (from PartialRefrigerantCycle) | Reduce heat flow to the evaporator based on the icing factor | |
| Modelica.Blocks.Math.Feedback | feeHeaFloEva (from PartialHeatPumpCycle) | Calculates evaporator heat flow with total energy balance | |
| Modelica.Blocks.Math.Product | scaFacTimPel (from PartialTableDataSDF) | Scale electrical power consumption | |
| Modelica.Blocks.Math.Product | scaFacTimQUse_flow (from PartialTableDataSDF) | Scale useful heat flow rate | |
| Modelica.Blocks.Sources.Constant | constScaFac (from PartialTableDataSDF) | Calculates correction of table output based on scaling factor | |
| Modelica.Blocks.Routing.RealPassThrough | reaPasThrTEvaIn (from PartialTableDataSDF) | Used to enable conditional bus connection | |
| Modelica.Blocks.Routing.RealPassThrough | reaPasThrTConIn (from PartialTableDataSDF) | Used to enable conditional bus connection | |
| Modelica.Blocks.Routing.RealPassThrough | reaPasThrTEvaOut (from PartialTableDataSDF) | Used to enable conditional bus connection | |
| Modelica.Blocks.Routing.RealPassThrough | reaPasThrTConOut (from PartialTableDataSDF) | Used to enable conditional bus connection | |
| Modelica.Blocks.Math.Gain[nDim] | facGain (from PartialTableDataSDF) | Convert relative speed n to an absolute value for interpolation in sdf tables | |
| SDF.NDTable | nDTabQUse_flow (from PartialTableDataSDF) | SDF-Table data for condenser heat flow | |
| SDF.NDTable | nDTabPEle (from PartialTableDataSDF) | SDF table data for electrical power | |
| Modelica.Blocks.Routing.Multiplex | mux (from PartialTableDataSDF) | Concat all inputs into an array | |
| RearrangeInputs | ordInp (from PartialTableDataSDF) | Possibly change Input order | |
| Modelica.Blocks.Math.Product | onOffTimScaFac (from PartialTableDataSDF) | Create the product of the scaling factor and whether the device is even on | |
| Modelica.Blocks.Math.BooleanToReal | booToRea (from PartialTableDataSDF) | Convert on/off signal to real | |
| SDF.NDTable[nExtSta] | nDTabSta (from PartialTableDataSDF) | SDF-Table data for extra states | |
| Modelica.Blocks.Math.Add | dTEvaMea | Evaporator delta T |
Revisions
- October 09, 2025, by Hannah Vering:
Adapted to include dt Evaporator (see issue AixLib #1602) - August 27, 2024 by Fabian Wuellhorst:
First implementation (see issue AixLib #1520)