modelHeatSource_HP_AW2
Information
Description
This model is based on data received from Daikin from an Altherma heat pump, and the full heat pump is implemented as IDEAS.Thermal.Components.Production.HP_AWMod_Losses. (vermoedelijk IDEAS.Thermal.Components.Production.HP_AirWater
The nominal power of the original heat pump is 7177 W at 2/35 degC.
First, the thermal power and electricity consumption are interpolated for the evaporator and condensing temperature at 4 different modulation levels. The results are rescaled to the nominal power of the modelled heatpump (with QNom/QNom_data) and stored in 2 different vectors, Q_vector and P_vector.
Finally, the modulation is calculated based on the asked power and the max power at operating conditions:
- if modulation_init < modulation_min, the heat pump is OFF, modulation = 0.
- if modulation_init > 100%, the modulation is 100%
- if modulation_init between modulation_min and modulation_start: hysteresis for on/off cycling.
If the heat pump is on another modulation level, interpolation is made to get P and Q at the real modulation.
ATTENTION
This model takes into account environmental heat losses of the heat pump. In order to keep the same nominal efficiency during operation, these heat losses are added to the computed power. Therefore, the heat losses are only really 'losses' when the heat pump is NOT operating.
The COP is calculated as the heat delivered to the condensor divided by the electrical consumption (P).
Assumptions and limitations
- Based on interpolation in manufacturer data for Daikin Altherma heat pump
- Ensure not to operate the heat pump outside of the manufacturer data. No check is made if this happens, and this can lead to strange and wrong results.
Model use
This model is used in the HP_AirWater model. If a different heat pump is to be simulated, copy this model and adapt the interpolation tables.
Validation
See the air-water heat pmp model.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Power | QNomRef | 7177 | Nominal power of the Daikin Altherma. See datafile |
| Real | mod_vector | {0, 30, 50, 90, 100} | 5 modulation steps, % |
| Modelica.Units.SI.ThermalConductance | UALoss | UA of heat losses of HP to environment | |
| Modelica.Units.SI.Power | QNom | The power at nominal conditions (2/35) | |
| Real | modulation_min | 20 | Minimal modulation percentage |
| Real | modulation_start | 35 | Min estimated modulation level required for start of HP |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | heatPort | heatPort connection to water in condensor | |
| Modelica.Blocks.Interfaces.RealInput | TCondensor_set | ||
| Modelica.Blocks.Interfaces.BooleanInput | on | ||
| Modelica.Blocks.Interfaces.RealInput | TCondensor_in | In-comming condensor temperature | |
| Modelica.Blocks.Interfaces.RealInput | m_flowCondensor | Condenor mass-flow rate |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | Q_vector | Thermal power for 5 modulation steps, in kW | |
| Real | P_vector | Electrical power for 5 modulation steps, in kW | |
| Modelica.Units.SI.Power | QMax | Maximum thermal power at specified evap and condr temperatures, in W | |
| Modelica.Units.SI.Power | QAsked | ||
| Real | modulationInit | Initial modulation, decides on start/stop of the HP | |
| Real | modulation | Current modulation percentage | |
| Modelica.Units.SI.Power | PEl | Resulting electrical power | |
| Modelica.Units.SI.Temperature | TEvaporator | Evaporator temperature | |
| Modelica.Units.SI.Temperature | TEnvironment | Temperature of environment for heat losses | |
| Modelica.Units.SI.SpecificEnthalpy | hIn | Specific enthalpy at the inlet | |
| Modelica.Blocks.Tables.CombiTable2Ds | P100 | ||
| Modelica.Blocks.Tables.CombiTable2Ds | P90 | ||
| Modelica.Blocks.Tables.CombiTable2Ds | P50 | ||
| Modelica.Blocks.Tables.CombiTable2Ds | P30 | ||
| Modelica.Blocks.Tables.CombiTable2Ds | Q100 | ||
| Modelica.Blocks.Tables.CombiTable2Ds | Q90 | ||
| Modelica.Blocks.Tables.CombiTable2Ds | Q50 | ||
| Modelica.Blocks.Tables.CombiTable2Ds | Q30 | ||
| Modelica.Units.SI.HeatFlowRate | QLossesToCompensate | Environment losses |
Contents
| Name | Description |
|---|---|
 Medium | Medium in the component |