Buildings.Fluid.DXSystems.Heating.AirSource.Validation
Collection of validation models
Information
This package contains validation models for the classes in Buildings.Fluid.DXSystems.Heating.AirSource.
Note that most validation models contain simple input data which may not be realistic, but for which the correct output can be obtained through an analytic solution. The examples plot various outputs, which have been verified against these solutions. These model outputs are stored as reference data and used for continuous validation whenever models in the library change.
Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).
Package Content
| Name | Description |
|---|---|
 SingleSpeed_OnDemandResistiveDefrost
|
Validation model for single speed heating DX coil with defrost operation |
| SingleSpeed_OnDemandReverseCycleDefrost
|
Validation model for single speed heating DX coil with defrost operation |
| SingleSpeed_TimedResistiveDefrost
|
Validation model for single speed heating DX coil with defrost operation |
| SingleSpeed_TimedReverseCycleDefrost
|
Validation model for single speed heating DX coil with defrost operation |
 Data
|
Package with performance data used in validation models |
 BaseClasses
|
Baseclasses for validation models |
Buildings.Fluid.DXSystems.Heating.AirSource.Validation.SingleSpeed_OnDemandResistiveDefrost
Validation model for single speed heating DX coil with defrost operation
Information
This model validates the model
Buildings.Fluid.DXSystems.Heating.AirSource.SingleSpeed with the
defrost time fraction calculation datDef.defTri set to
DefrostTimeMethods.onDemand and the defrost operation type
datDef.defOpe set to DefrostOperation.resistive.
The difference in results of TOut and XOut at the beginning and end of the simulation is because the mass flow rate is zero. For zero mass flow rate, EnergyPlus assumes steady state condition, whereas the Modelica model is a dynamic model and hence the properties at the outlet are equal to the state variables of the model.
The EnergyPlus results were generated using the example file DXCoilSystemAuto.idf
from EnergyPlus 22.2. The results were then used to set-up the boundary conditions
for the model as well as the input signals. To compare the results,
the Modelica outputs are averaged over 3600 seconds, and the EnergyPlus
outputs are used with a zero order delay to avoid the time shift in results.
Note that EnergyPlus mass fractions (X) are in mass of water vapor
per mass of dry air, whereas Modelica uses the total mass as a reference. Also,
the temperatures in Modelica are in Kelvin whereas they are in Celsius in EnergyPlus.
Hence, the EnergyPlus values are corrected by using the appropriate conversion blocks.
The plots compare the outlet temperature and humidity ratio between Modelica and EnergyPlus. They also compare the power consumption by the coil compressor as well as the heat transfer from the airloop.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.DXSystems.Heating.AirSource.Validation.BaseClasses.SingleSpeedHeating (Baseclass for validation models for single speed DX heating coil).
Modelica definition
Buildings.Fluid.DXSystems.Heating.AirSource.Validation.SingleSpeed_OnDemandReverseCycleDefrost
Validation model for single speed heating DX coil with defrost operation
Information
This model validates the model
Buildings.Fluid.DXSystems.Heating.AirSource.SingleSpeed with the
defrost time fraction calculation datDef.defTri set to
DefrostTimeMethods.onDemand and the defrost operation type
datDef.defOpe set to DefrostOperation.reverseCycle.
The difference in results of TOut and XOut at the beginning and end of the simulation is because the mass flow rate is zero. For zero mass flow rate, EnergyPlus assumes steady state condition, whereas the Modelica model is a dynamic model and hence the properties at the outlet are equal to the state variables of the model.
The EnergyPlus results were generated using the example file DXCoilSystemAuto.idf
from EnergyPlus 22.2. The results were then used to set-up the boundary conditions
for the model as well as the input signals. To compare the results,
the Modelica outputs are averaged over 3600 seconds, and the EnergyPlus
outputs are used with a zero order delay to avoid the time shift in results.
Note that EnergyPlus mass fractions (X) are in mass of water vapor
per mass of dry air, whereas Modelica uses the total mass as a reference. Also,
the temperatures in Modelica are in Kelvin whereas they are in Celsius in EnergyPlus.
Hence, the EnergyPlus values are corrected by using the appropriate conversion blocks.
The plots compare the outlet temperature and humidity ratio between Modelica and EnergyPlus. They also compare the power consumption by the coil compressor as well as the heat transfer from the airloop.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.DXSystems.Heating.AirSource.Validation.BaseClasses.SingleSpeedHeating (Baseclass for validation models for single speed DX heating coil).
Modelica definition
Buildings.Fluid.DXSystems.Heating.AirSource.Validation.SingleSpeed_TimedResistiveDefrost
Validation model for single speed heating DX coil with defrost operation
Information
This model validates the model
Buildings.Fluid.DXSystems.Heating.AirSource.SingleSpeed with the
defrost time fraction calculation datDef.defTri set to
DefrostTimeMethods.timed and the defrost operation type
datDef.defOpe set to DefrostOperation.resistive.
The difference in results of TOut and XOut at the beginning and end of the simulation is because the mass flow rate is zero. For zero mass flow rate, EnergyPlus assumes steady state condition, whereas the Modelica model is a dynamic model and hence the properties at the outlet are equal to the state variables of the model.
The EnergyPlus results were generated using the example file DXCoilSystemAuto.idf
from EnergyPlus 22.2. The results were then used to set-up the boundary conditions
for the model as well as the input signals. To compare the results,
the Modelica outputs are averaged over 3600 seconds, and the EnergyPlus
outputs are used with a zero order delay to avoid the time shift in results.
Note that EnergyPlus mass fractions (X) are in mass of water vapor
per mass of dry air, whereas Modelica uses the total mass as a reference. Also,
the temperatures in Modelica are in Kelvin whereas they are in Celsius in EnergyPlus.
Hence, the EnergyPlus values are corrected by using the appropriate conversion blocks.
The plots compare the outlet temperature and humidity ratio between Modelica and EnergyPlus. They also compare the power consumption by the coil compressor as well as the heat transfer from the airloop.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.DXSystems.Heating.AirSource.Validation.BaseClasses.SingleSpeedHeating (Baseclass for validation models for single speed DX heating coil).
Modelica definition
Buildings.Fluid.DXSystems.Heating.AirSource.Validation.SingleSpeed_TimedReverseCycleDefrost
Validation model for single speed heating DX coil with defrost operation
Information
This model validates the model
Buildings.Fluid.DXSystems.Heating.AirSource.SingleSpeed with the
defrost time fraction calculation datDef.defTri set to
DefrostTimeMethods.timed and the defrost operation type
datDef.defOpe set to DefrostOperation.reverseCycle.
The difference in results of TOut and XOut at the beginning and end of the simulation is because the mass flow rate is zero. For zero mass flow rate, EnergyPlus assumes steady state condition, whereas the Modelica model is a dynamic model and hence the properties at the outlet are equal to the state variables of the model.
The EnergyPlus results were generated using the example file DXCoilSystemAuto.idf
from EnergyPlus 22.2. The results were then used to set-up the boundary conditions
for the model as well as the input signals. To compare the results,
the Modelica outputs are averaged over 3600 seconds, and the EnergyPlus
outputs are used with a zero order delay to avoid the time shift in results.
Note that EnergyPlus mass fractions (X) are in mass of water vapor
per mass of dry air, whereas Modelica uses the total mass as a reference. Also,
the temperatures in Modelica are in Kelvin whereas they are in Celsius in EnergyPlus.
Hence, the EnergyPlus values are corrected by using the appropriate conversion blocks.
The plots compare the outlet temperature and humidity ratio between Modelica and EnergyPlus. They also compare the power consumption by the coil compressor as well as the heat transfer from the airloop.
Extends from Modelica.Icons.Example (Icon for runnable examples), Buildings.Fluid.DXSystems.Heating.AirSource.Validation.BaseClasses.SingleSpeedHeating (Baseclass for validation models for single speed DX heating coil).