modelsolarThermal_Boiler
Extends from TransiEnt.Consumer.Systems.HouseholdEnergyConverter.Systems.Base.Systems.
Information
1. Purpose of model
Combination of solarthermal panel, thermal storage tank and boiler models to be used in the energyConverter.
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.Combined.HouseholdDemandIn demand
TransiEnt.Basics.Interfaces.Electrical.ApparentPowerPort epp - connection to electrical grid
TransiEnt.Basics.Interfaces.Gas.RealGasPortIn gasPortIn - connection to gas grid
5. Nomenclature
(no remarks)
6. Governing Equations
(no remarks)
7. Remarks for Usage
The model contains models for a solarthermal panel, a stratified storage tank, a gas boiler and a controller for the operation of the solar thermal panel. Different control modes can be selected.
No fluid flow into the storage tank is considered, therefore the energy input into each layer into the storage tank is defined by energy balances.
8. Validation
(no remarks)
9. References
(no remarks)
10. Version History
Model created by Anne Hagemeier, Fraunhofer UMSICHT in 2017
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | el_grid (from Systems) | ||
| Boolean | gas_grid (from Systems) | ||
| Boolean | DHN (from Systems) | ||
| Fluid Definition | |||
| TILMedia.VLEFluidTypes.BaseVLEFluid | FuelMedium | simCenter.gasModel1 | Fuel gas medium |
| SI.SpecificEnthalpy | HoC_fuel | 40e6 | Heat of combustion of fuel, will be used if gasport is deactivated in model |
| System setup | |||
| Boolean | useGasPort | true | True if gas port shall be used |
| Boolean | SpaceHeating | true | Does the solar heating system provide energy for space heating? |
| SI.Temperature | T_return | 308.15 | Return temperature of the heating system |
| SI.Temperature | T_boiler | 60 + 273.15 | Temperature setpoint of the boiler |
| Storage | |||
| SI.Temperature | T_room | 288 | Temperature of the installation room |
| SI.Volume | Volume_tank | 2 | Volume of the storage tank |
| Real[3] | p_Volume | {0.2, 0.3, 0.5} | Proportion of the total volume for the three parts of the tank |
| SI.Temperature[storage.N_cv] | T_start | fill(273.15 + 60, storage.N_cv) | Temperatures at initalization |
| SI.Length | h_tank | 1 | Height of tank |
| SI.CoefficientOfHeatTransfer | U_wall | 0.5 | Coefficient of heat transfer from wall to ambient |
| SI.ThermalConductivity | k | 0.6 | Thermal conductivity of fluid in storage |
| SI.Density | rho | 1e3 | Density of fluid in storage |
| SI.SpecificHeatCapacity | c_v | 4.185e3 | Heat capacity of fluid in storage |
| Boiler | |||
| SI.HeatFlowRate | Q_flow_n_boiler | 20000 | Nominal heating power of the gas boiler |
| SI.Efficiency | eta | 1.05 | Boiler's overall efficiency |
| TransiEnt.Basics.Types.TypeOfPrimaryEnergyCarrierHeat | typeOfPrimaryEnergyCarrier | TransiEnt.Basics.Types.TypeOfPrimaryEnergyCarrierHeat.NaturalGas | Type of primary energy carrier for co2 emissions global statistics |
| Collector | |||
| SI.Irradiance | G_min | 150 | Minimum Irradiance before collector is working |
| SI.Temperature | T_set | 348.15 | Temperature set point for controller |
| SI.Temperature | T_max | 273.15 + 95 | Maximum input temperature for collector switch-off |
| SI.HeatFlowRate | Q_flow_n | 100e3 | Nominal heat flow rate of the collector (for cost calculation) |
| SI.Area | area | 5 | Aperture area |
| Real | c_eff | 5000 | Effective thermal capacity of the collector |
| Real | eta_0 | 0.793 | Zero-loss collector efficiency |
| Real | a1 | 4.04 | Heat loss coefficient at (T_m - T_amb) = 0 |
| Real | a2 | 0.0182 | Temperature dependent heat loss coefficient |
| SI.Angle | longitude_standard | Modelica.Units.Conversions.from_deg(15) | Needed for calculation of coordinated universal time (utc), 15 for central european time, 30 for central european summer time |
| Modelica.Units.NonSI.Time_day | totaldays | 365 | Total days of the year, standard=365, leap year=366 |
| SI.Angle | latitude | Modelica.Units.Conversions.from_deg(53.55) | Latitude of the local position, north posiive, 53,55 North for Hamburg |
| SI.Angle | slope | Modelica.Units.Conversions.from_deg(53.55) | Slope of the tilted surface, assumption |
| SI.Angle | surfaceAzimuthAngle | 0 | Surface azimuth angle |
| Real | reflectance_ground | 0.2 | Reflectance of the ground |
| Boolean | direct_normal | true | Is the direct irradiance measured on a surface normal to irradiance? |
| SI.Angle | longitude_local | Modelica.Units.Conversions.from_deg(10) | Longitude of the local position, east positive, 10 East for Hamburg |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| TransiEnt.Basics.Interfaces.Combined.HouseholdDemandIn | demand (from Systems) | Electricity, space heating, water heating | |
| TransiEnt.Basics.Interfaces.Thermal.FluidPortIn | waterPortIn (from Systems) | ||
| TransiEnt.Basics.Interfaces.Thermal.FluidPortOut | waterPortOut (from Systems) | ||
| TransiEnt.Basics.Interfaces.Electrical.ApparentPowerPort | epp (from Systems) | ||
| TransiEnt.Basics.Interfaces.Gas.RealGasPortIn | gasPortIn (from Systems) |
Components
Contents
| Name | Description |
|---|---|
 BoilerCostModel | |
 Skymodel | |
 CostStatisticsModel | Model for global cost calculation of the storage |
 CostRecordSolarThermal | Solar thermal cost specification |