modelSmallScaleCHPsystem

Information

1. Purpose of model

Combination of storage tank, CHP unit, boiler and controller model into one system model with a connection to the electrical and gas grid.

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

TransiEnt.Basics.Interfaces.Thermal.HeatFlowRateIn Q_demand

TransiEnt.Basics.Interfaces.Electrical.ApparentPowerPort epp

TransiEnt.Basics.Interfaces.Gas.RealGasPortIn gasPortIn

5. Nomenclature

(no elements)

6. Governing Equations

(no equations)

7. Remarks for Usage

All components use energy based modeling without consideration of heat transfer media.

8. Validation

(no validation or testing necessary)

9. References

(no remarks)

10. Version History

Model created by Anne Hagemeier, Fraunhofer UMSICHT, 2018

Type	Name	Default	Description
Fundamental Definitions
TILMedia.VLEFluidTypes.BaseVLEFluid	FuelMedium	simCenter.gasModel1	Medium to be used for fuel gas
Configuration
SI.SpecificEnthalpy	HoC_fuel	40e6	heat of combustion of fuel used
Boolean	useGasPort	true	True if gas port shall be used
Storage Parameters
SI.Temperature	T_s_max	363.15	Maximum storage temperature
SI.Temperature	T_s_min	303.15	Minimum storage temperature
SI.Temperature	T_start	353.15	Start temperature
SI.Volume	V_Storage	0.5	Volume of the storage
SI.Height	height	1.3	Height of heat storage
SI.Diameter	d	sqrt(4*V_Storage/Modelica.Constants.pi/height)	Diameter 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
CHP Parameters
SI.Power	Q_flow_n_CHP	4000	Heat output of CHP
SI.Power	P_n_CHP	8000	Electric power output of CHP
SI.Efficiency	eta_el	0.3	Constant electric efficiency of the CHP
SI.Efficiency	eta_th	0.6	Constant thermal efficiency of the CHP
Boiler Parameters
SI.Efficiency	eta_boiler	1.05	Boiler's overall efficiency
SI.HeatFlowRate	Q_flow_n_boiler	20000	Nominal heating power of the gas boiler

Type	Name	Default	Description
PowerPortModel	epp
TransiEnt.Basics.Interfaces.Gas.RealGasPortIn	gasPortIn
TransiEnt.Basics.Interfaces.Thermal.HeatFlowRateIn	Q_Demand

Type	Name	Default	Description
TransiEnt.SimCenter	simCenter
TransiEnt.Storage.Heat.HotWaterStorage_constProp_L2.HotWaterStorage_constProp_L2	Storage
Modelica.Blocks.Math.Add	add
TransiEnt.Producer.Heat.Gas2Heat.SimpleGasBoiler.SimpleBoiler	gasBoiler1
TransiEnt.Producer.Combined.SmallScaleCHP.SmallScaleCHP_simple.SmallScaleCHP_simple	smallScaleCHP_simple
TransiEnt.Producer.Combined.SmallScaleCHP.SmallScaleCHP_simple.Control.ControlBoilerCHP_modulatingBoiler_HeatLed	controller

Name	Description
PowerPortModel
PowerBoundaryModel