modelHotWaterStorage_L2
Stratified hot water storage without spatial discretisation (based on analytic solution for output temperature at steady state)
Extends from TransiEnt.Basics.Icons.ThermalStorageBasic (Icon for thermal storage model).
Information
1. Purpose of model
Hot water storage without spatial discretisation (based on analytic solution for output temperature at steady state). Thermodynamic properties are calculated in dependance of the temperature.
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
GenIn: inlet from heat generator
GenOut: outlet to heat generator
ConIn: inlet from heat consumer
ConOut: outlet to heat consumer
Q_flow_gen: generated heat flow [W]
T_Stor: output for temperature in heat reservoir in K [K]
5. Nomenclature
(no elements)
6. Governing Equations
mass balances
heat loss to environment
first law of thermodynamics
impulse balances
7. Remarks for Usage
(no remarks)
8. Validation
(no remarks)
9. References
(no remarks)
10. Version History
Created by Inken Knop (inken.knop@tuhh.de), Jun 2015
Edited by Pascal Dubucq (dubucq@tuhh.de), Aug 2015
Revised by Lisa Andresen (andresen@tuhh.de), Dec 2016
Modified by Anne Senkel (anne.senkel@tuhh.de), Dec 2017
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| TILMedia.VLEFluidTypes.BaseVLEFluid | Medium | simCenter.fluid1 | |
| Modelica.Units.SI.Pressure | dp | 0.02e5 | Pressure drop on generator and consumer side |
| Modelica.Units.SI.Temperature | T_max | 383.15 | Maximum allowed temperature in Storage |
| Modelica.Units.SI.Temperature | T_start | 273.15 + 30 | Initial Temperature of heat storage |
| Modelica.Units.SI.Temperature | T_amb | 273.15 + 18 | Assumed constant ambient temperature |
| Modelica.Units.SI.Height | height | 1.0 | Heigh of heat storage |
| Modelica.Units.SI.Diameter | d_tank | 0.8 | Diameter of heat storage |
| Modelica.Units.SI.Diameter | d_pipe_gen | 0.01 | Diameter of pipe from the generator side |
| Modelica.Units.SI.Length | l_pipe_gen | 9 | length of pipe from the generator side in the storage tank for heat transfer |
| Modelica.Units.SI.Diameter | d_pipe_con | 0.01 | Diameter of pipe from the consumer side |
| Modelica.Units.SI.Length | l_pipe_con | 14.2 | length of pipe from the consumer side in the storage tank for heat transfer |
| Modelica.Units.SI.SurfaceCoefficientOfHeatTransfer | k | 0.08 | Coefficient of heat Transfer from storage to room |
| Modelica.Units.SI.ThermalConductivity | lambda_pipe | 236 | thermal conductivity of aluminium pipe |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| TransiEnt.Basics.Interfaces.Thermal.FluidPortIn | GenIn | inlet from heat generator | |
| TransiEnt.Basics.Interfaces.Thermal.FluidPortOut | GenOut | outlet to heat generator | |
| TransiEnt.Basics.Interfaces.Thermal.FluidPortIn | ConIn | inlet from heat consumer | |
| TransiEnt.Basics.Interfaces.Thermal.FluidPortOut | ConOut | outlet to heat consumer | |
| TransiEnt.Basics.Interfaces.Thermal.HeatFlowRateOut | Q_flow_gen | Generated heat flow | |
| TransiEnt.Basics.Interfaces.General.TemperatureOut | T_Stor | Temperature in heat reservoir in K |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| TransiEnt.SimCenter | simCenter | ||
| Modelica.Units.SI.Energy | E_stor | Stored Energy (with cp and density of the Storage medium | |
| Modelica.Units.SI.HeatFlowRate | Q_flow_con | heat flow to heat consumer | |
| Modelica.Units.SI.HeatFlowRate | Q_flow_loss | surface losses to the environment | |
| Modelica.Units.SI.Temperature | T_stor | Temperature of the storage | |
| Modelica.Units.SI.Temperature | T_genOut | ||
| Modelica.Units.SI.Temperature | T_conOut | ||
| Modelica.Units.SI.SpecificHeatCapacity | cpCon | ||
| Modelica.Units.SI.SpecificHeatCapacity | cpGen | ||
| Real | Re_Gen | Re-number for tube flow | |
| Real | Pr_Gen | Pr-number | |
| Real | Nu_Gen | Nu-number Nu=0.021*Re^0.8*Pr^1/3 | |
| Modelica.Units.SI.Velocity | v_Gen | flow velocity in the pipe | |
| Modelica.Units.SI.DynamicViscosity | eta_Gen | dynamic viscosity of the water | |
| Modelica.Units.SI.CoefficientOfHeatTransfer | alpha_Gen | coefficient of heat transfer from water to the pipe with a turbulent tube flow | |
| Real | Re_Con | Re-number for tube flow | |
| Real | Pr_Con | Pr-number | |
| Real | Nu_Con | Nu-number Nu=0.021*Re^0.8*Pr^1/3 | |
| Modelica.Units.SI.Velocity | v_Con | flow velocity in the pipe | |
| Modelica.Units.SI.DynamicViscosity | eta_Con | dynamic viscosity of the water | |
| Modelica.Units.SI.CoefficientOfHeatTransfer | alpha_Con | coefficient of heat transfer from water to the pipe with a turbulent tube flow | |
| Modelica.Units.SI.ThermalConductivity | k_pipe_gen | ||
| Modelica.Units.SI.ThermalConductivity | k_pipe_con | ||
| Modelica.Units.SI.MassFlowRate | m_flow_con | ||
| Modelica.Units.SI.SpecificEnthalpy | h_outflow_con | ||
| Modelica.Units.SI.SpecificEnthalpy | h_outflow_gen | ||
| TILMedia.Internals.VLEFluidConfigurations.FullyMixtureCompatible.VLEFluid_ph | GenIn_State | ||
| TILMedia.Internals.VLEFluidConfigurations.FullyMixtureCompatible.VLEFluid_ph | GenOut_State | ||
| TILMedia.Internals.VLEFluidConfigurations.FullyMixtureCompatible.VLEFluid_pT | Tank_Medium | ||
| TILMedia.Internals.VLEFluidConfigurations.FullyMixtureCompatible.VLEFluid_ph | ConIn_State | ||
| TILMedia.Internals.VLEFluidConfigurations.FullyMixtureCompatible.VLEFluid_ph | ConOut_State |
Contents
| Name | Description |
|---|---|
| alpha_for_Nu_lam_dprotected | |
| Nu_for_Re_Prprotected | |
| Re_for_v_nu_dprotected | |
| Pr_for_lam_eta_cpprotected |