modelHeatPumpSystem
Heat pump system with storage and controller, input: heat demand, output: electrical power
Information
1. Purpose of model
Combination of storage tank, heat pump, supplementary electric heater and controller.
2. Level of detail, physical effects considered, and physical insight
(Purely technical component without physical modeling.)
3. Limits of validity
(Purely technical component without physical modeling.)
4. Interfaces
HeatFlowRateIn Q_Demand
Powerport epp
5. Nomenclature
(no elements)
6. Governing Equations
(no equations)
7. Remarks for Usage
(no remarks)
8. Validation
(no validation or testing necessary)
9. References
(no remarks)
10. Version History
Model from TransiEnt 1.1.0 modified by Anne Hagemeier (anne.hagemeier@umsicht.fraunhofer.de), Nov 2019
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Control | |||
| Boolean | Modulating | true | True: modulating heat pump operation, false: static operation with P_n |
| Boolean | MinTimes | true | If true, minimum operation and shutoff times are considered |
| Boolean | CalculatePHeater | false | If true, electrical heater power output is calculated for bivalent heat pump operation |
| Boolean | control_SoC | false | Choose controlled variable, 'true'=SoC, 'false'=Storage temperature |
| TransiEnt.Basics.Types.OnOffRelaisStatus | init_state | TransiEnt.Basics.Types.on_ready | State of relais at initialization |
| SI.TemperatureDifference | Delta_T_db | 2 | Deadband of hysteresis control |
| Heat storage | |||
| SI.Temperature | T_s_min | 303.15 | Minimum storage temperature |
| SI.Volume | V_Storage | 0.5 | Volume of the Storage |
| SI.Height | height | 1.3 | Height of heat storage |
| Modelica.Units.NonSI.Temperature_degC | T_amb | 15 | Assumed constant temperature in tank installation room |
| SI.SurfaceCoefficientOfHeatTransfer | k | 0.08 | Coefficient of heat transfer through tank surface |
| Storage parameters | |||
| SI.Diameter | d | sqrt(4*V_Storage/Modelica.Constants.pi/height) | Diameter of heat storage |
| Heatpump | |||
| Boolean | usePowerPort | true | True if power port shall be used |
| Boolean | use_T_source_input_K | false | False, use outer ambient conditions |
| SI.TemperatureDifference | Delta_T_internal | 5 | Temperature difference between refrigerant and source/sink temperature |
| SI.HeatFlowRate | Q_flow_n | 3.5e3 | Nominal heat flow of heat pump at nominal conditions according to EN14511 |
| Real | COP_n | 3.7 | Coefficient of performance at nominal conditions according to EN14511 |
| Heater | |||
| SI.Power | P_el_n | 10e3 | Nominal electric power of the backup heater |
| SI.Efficiency | eta_Heater | 0.95 | Efficiency of the backup heater |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| PowerPortModel | epp | ||
| TransiEnt.Basics.Interfaces.Thermal.HeatFlowRateIn | Q_Demand |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| TransiEnt.SimCenter | simCenter | ||
| SI.Temperature | T_set | 323.15 | Output temperature of the heat pump |
| SI.Temperature | T_source | simCenter.ambientConditions.temperature.value + 273.15 | Temperature of heat source |
| Storage.Heat.HotWaterStorage_constProp_L2.HotWaterStorage_constProp_L2 | heatStorage | ||
| Modelica.Blocks.Sources.RealExpression | realExpression | ||
| TransiEnt.Producer.Heat.Power2Heat.Heatpump.BivalentHeatPumpWithControl | heatPumpWithControl |
Contents
| Name | Description |
|---|---|
 PowerBoundaryModel | |
 PowerPortModel |