modelHeatpump

Simple heatpump model that calculates the heat output from the externally specified electric power

Information

1. Purpose of model

Simple heat pump with power input specified externally.

2. Level of detail, physical effects considered, and physical insight

Efficiency calculation based on Carnot efficiency.

Relative difference to Carnot efficiency at reference point kept at all operating points

3. Limits of validity

(no remarks)

4. Interfaces

TransiEnt.Basics.Interfaces.Thermal.TemperatureIn_K T_set

TransiEnt.Basics.Interfaces.Electrical.ElectricPowerIn P_set_el

TransiEnt.Basics.Interfaces.Thermal.HeatFlowRateOut Heat_output

5. Nomenclature

(no elements)

6. Governing Equations

COP_Carnot=(T_set+Delta_T_internal)/max(2*Delta_T_internal, T_set + 2*Delta_T_internal - T_source_internal)

COP=COP_Carnot*eta_HP

7. Remarks for Usage

(no remarks)

8. Validation

not validated yet

9. References

(no remarks)

10. Version History

Model from TransiEnt 1.1.0 modified by Anne Hagemeier (anne.hagemeier@umsicht.fraunhofer.de), Jan 2019

Type	Name	Default	Description
Real	eta_HP	COP_n/((273.15 + 40)/(40 - 2))
Modelica.Units.SI.Power	P_el_n	Q_flow_n/COP_n
Heat pump parameters
Boolean	use_T_source_input_K	false	False, use outer ambient conditions
Modelica.Units.SI.TemperatureDifference	Delta_T_internal	5	Temperature difference between refrigerant and source/sink temperature
Modelica.Units.SI.TemperatureDifference	Delta_T_db	2	Deadband of hysteresis control
Modelica.Units.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
Fundamental Definitions
Boolean	usePowerPort	true	True if power port shall be used
TILMedia.VLEFluidTypes.BaseVLEFluid	medium	simCenter.fluid1	Medium to be used
Boolean	useFluidPorts	true	True if fluid ports shall be used
SI.Pressure	p_drop	simCenter.p_nom[2] - simCenter.p_nom[1]
Boolean	useHeatPort	true	True if heat port shall be used

Type	Name	Description
TransiEnt.Basics.Interfaces.General.TemperatureIn	T_source_input_K	Temperature of source
Basics.Interfaces.Thermal.HeatFlowRateIn	Q_flow_set	Heatflow set point
TransiEnt.Basics.Interfaces.Thermal.HeatFlowRateOut	Heat_output	Setpoint value, e.g. Storage setpoint temperature
PowerPortModel	epp
TransiEnt.Basics.Interfaces.Thermal.FluidPortIn	inlet
TransiEnt.Basics.Interfaces.Thermal.FluidPortOut	outlet
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_b	heatPort
TransiEnt.Basics.Interfaces.General.TemperatureOut	T_source_internal	Temperature of heat source used for calculation

Type	Name	Default	Description
TransiEnt.SimCenter	simCenter
TransiEnt.ModelStatistics	modelStatistics
Modelica.Units.SI.Temperature	T_source	simCenter.ambientConditions.temperature.value + 273.15	Temperature of heat source
Real	COP_Carnot	(T_set + Delta_T_internal)/max(2Delta_T_internal, T_set + 2Delta_T_internal - T_source_internal)
SI.Temperature	T_set	50 + 273.15	Heatpump supply temperature
Modelica.Blocks.Math.Division	P_el
Modelica.Blocks.Sources.RealExpression	COP
TransiEnt.Components.Statistics.Collectors.LocalCollectors.HeatingPlantCost	heatingPlantCost
heatFlowBoundaryModel	heatFlowBoundary
TransiEnt.Components.Sensors.TemperatureSensor	T_in_sensor
TransiEnt.Components.Sensors.TemperatureSensor	T_out_sensor
TransiEnt.Components.Sensors.SpecificEnthalpySensorVLE	specificEnthalpySensorVLE
ClaRa.Components.Sensors.SensorVLE_L1_m_flow	massFlowSensorVLE
TransiEnt.Components.Sensors.SpecificEnthalpySensorVLE	specificEnthalpySensorVLE1
PowerBoundaryModel	Power		Choice of power boundary model. The power boundary model must match the power port.
Modelica.Thermal.HeatTransfer.Sources.PrescribedHeatFlow	prescribedHeatFlow
TransiEnt.Components.Statistics.Collectors.LocalCollectors.CollectElectricPower	collectElectricPower
TransiEnt.Components.Statistics.Collectors.LocalCollectors.CollectHeatingPower	collectHeatingPower