modelPartialBoiler
Boiler base class with efficiency unspecified
Extends from Interfaces.TwoPortHeatMassExchanger.
Information
This is a base model of a boiler. The efficiency specified in extended models. See Buildings.Fluid.Boilers.UsersGuide for details.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Fluid.Data.Fuels.Generic | fue | Fuel type | |
| Modelica.Units.SI.Power | Q_flow_nominal | Nominal heating power | |
| Modelica.Units.SI.ThermalConductance | UA | 0.05*Q_flow_nominal/30 | Overall UA value |
| Modelica.Units.SI.Efficiency | eta_nominal | Boiler efficiency at nominal condition | |
| Dynamics | |||
| Modelica.Units.SI.Volume | VWat | 1.5E-6*Q_flow_nominal | Water volume of boiler |
| Modelica.Units.SI.Mass | mDry | 1.5E-3*Q_flow_nominal | Mass of boiler that will be lumped to water heat capacity |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Efficiency | eta | Boiler efficiency | |
| Modelica.Units.SI.Power | QFue_flow | y*Q_flow_nominal/eta_nominal | Heat released by fuel |
| Modelica.Units.SI.Power | QWat_flow | eta*QFue_flow + UAOve.Q_flow | Heat transfer from gas into water |
| Modelica.Units.SI.MassFlowRate | mFue_flow | QFue_flow/fue.h | Fuel mass flow rate |
| Modelica.Units.SI.VolumeFlowRate | VFue_flow | mFue_flow/fue.d | Fuel volume flow rate |
| Modelica.Blocks.Interfaces.RealInput | y | Part load ratio | |
| Modelica.Blocks.Interfaces.RealOutput | T | Temperature of the fluid | |
| Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a | heatPort | Heat port, can be used to connect to ambient | |
| Modelica.Thermal.HeatTransfer.Components.HeatCapacitor | heaCapDry | Heat capacity of boiler metal | |
| Buildings.HeatTransfer.Sources.PrescribedHeatFlow | preHeaFlo | Prescribed heat flow | |
| Modelica.Blocks.Sources.RealExpression | Q_flow_in | Heat transfer from gas into water | |
| Modelica.Thermal.HeatTransfer.Sensors.TemperatureSensor | temSen | Temperature of fluid | |
| Modelica.Thermal.HeatTransfer.Components.ThermalConductor | UAOve | Overall thermal conductance (if heatPort is connected) |
Revisions
-
November 10, 2021, by Hongxiang Fu:
The heating power output of the boiler is now corrected by its heat loss to the ambient. This is for #2725. -
October 4, 2021, by Hongxiang Fu:
Renamed from the old Buildings.Fluid.Boilers.BoilerPolynomial and with the efficiency specification removed. This is for #2651.