modelThermalInsulation_dynamic_3ways_2layer
Thermal Insulation - dynamic - 3 ways - 2 layer
Extends from ClaRa.Basics.Icons.WallThick, TransiEnt.Components.Heat.ThermalInsulation.Basics.ThermalInsulation_base (Partial Model for thermal Insulation).
Information
Purpose of model
Model for thermal insulation to the environment with dynamic heat transfer, 3 heat flow path(top, sides and bottom) and 2 material layer are considered.
Level of detail, physical effects considered, and physical insight
- L4 discretization in axial direction
- lateral dynamic heat transfer
- axial heat conduction inside thermal insulation
Limits of validity
- constant thickness in axial direction
- constant insulation surface in lateral direction
- constant temperature at start in axial direction, but can depend on lateral position
Interfaces
Heat port
References
The model was tested in this test model:
TransiEnt.Components.Heat.ThermalInsulation.Check.TestThermalInsulation
It was created for the Research Projekt "Future Energy Solution"
Version History
Model created by Michael von der Heyde (heyde@tuhh.de) for the Research Project "Future Energy Solution" (FES), 2020
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Fundamental Definitions | |||
| Integer | N_cv (from ThermalInsulation_base) | 10 | Number of axial control volumes |
| Geometry | |||
| Integer | N_iso (from ThermalInsulation_base) | 3 | Number of lateral insulation discretisation for each layer |
| SI.Length | length (from ThermalInsulation_base) | 1 | Length of Insulation |
| SI.Length | circumference (from ThermalInsulation_base) | 1 | Circumference of Insulation |
| SI.Length | thickness_top_L1 | 1 | Thickness of Insulation |
| SI.Length | thickness_top_L2 | 1 | Thickness of Insulation |
| SI.Length | thickness_sides_L1 | 1 | Thickness of Insulation |
| SI.Length | thickness_sides_L2 | 1 | Thickness of Insulation |
| SI.Length | thickness_bottom_L1 | 1 | Thickness of Insulation |
| SI.Length | thickness_bottom_L2 | 1 | Thickness of Insulation |
| Real | topPart | 1/3 | Relative partition of top Insulation |
| Real | sidesPart | 1/3 | Relative partition of sides Insulation |
| Real | bottomPart | 1/3 | Relative partition of bottom Insulation |
| Heat Transfer | |||
| SI.CoefficientOfHeatTransfer | alpha_iso2ambient_top | 20 | Top Insulation Surface to Air Heat Transfer Coefficient |
| SI.CoefficientOfHeatTransfer | alpha_iso2ambient_sides | 20 | Sides Insulation Surface to Air Heat Transfer Coefficient |
| Boolean | useAxialHeatConduction | false | True, if axial heat conduction through a wall shall be considered |
| Initialization | |||
| SI.Temperature | T_start_top | ones(2*N_iso)*simCenter.T_amb_start | |
| SI.Temperature | T_start_sides | ones(2*N_iso)*simCenter.T_amb_start | |
| SI.Temperature | T_start_bottom | ones(2*N_iso)*simCenter.T_amb_start | |
| SI.Temperature | T_earth | simCenter.T_amb_start | Bottom Temperature |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| ClaRa.Basics.Interfaces.HeatPort_a | heat (from ThermalInsulation_base) |
Components
Contents
| Name | Description |
|---|---|
 medium_top_L1 | |
| medium_top_L2 | |
| medium_sides_L1 | |
| medium_sides_L2 | |
| medium_bottom_L1 | |
| medium_bottom_L2 |