modelCVext
External boundary layer convection
Extends from BondLib.Interfaces.TwoPort (Partial model invoking two bondgraphic connectors).
Information
The external boundary layer convection requires a slightly more complex model than the internal convection, since air circulation around the dome removes hot air from the surface, thereby seemingly enhancing the convecting area.The model is essentially the same model as used for internal convection, but the conductance of convection is here not a constant, but rather a function of the wind velocity.
The wind velocity is retrieved from a large lookup table.
Parameters: ac: Cover area of Biosphere (default value = 5667.0 m2) hai: Convection coefficient equation intercept (default value = 39.6 kJ/(h.m2.K)) hai2: Convection coefficient equation slope (default value = 0.0034 kJ/(m3.K)) ucx: Cover normal specific thermal conductance adjustment factor (default value = 1) ucp: Cover normal specific thermal conductance (default value = 72 kJ/(h.m2.K)) R2: Specific resistance due to conduction (default value = 1/(ucx*ucp) h.m2.K/kJ)
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.SIunits.Area | ac | 5667.0 | Cover area of Biosphere |
| Real | hai | 39.6 | Convection coefficient equation intercept |
| Real | hai2 | 0.0034 | Convection coefficient equation slope |
| Real | ucx | 1 | Cover normal specific thermal conductance adjustment factor |
| Real | ucp | 72 | Cover normal specific thermal conductance |
| Real | R2 | 1/(ucx*ucp) | Specific resistance due to conduction |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| BondLib.Interfaces.BondCon | BondCon1 (from TwoPort) | Left bond graph connector | |
| BondLib.Interfaces.BondCon | BondCon2 (from TwoPort) | Right bond graph connector |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | e1 (from TwoPort) | Bondgraphic primary effort | |
| Real | f1 (from TwoPort) | Bondgraphic primary flow | |
| Real | e2 (from TwoPort) | Bondgraphic secondary effort | |
| Real | f2 (from TwoPort) | Bondgraphic secondary flow | |
| Real | uao | Wind velocity | |
| Real | R1 | Specific resistance due to convection | |
| Real | G0 | Thermal conductance | |
| BondLib.Junctions.J0p2 | J0p2_1 | ||
| BondLib.Junctions.J1p3 | J1p3_1 | ||
| BondLib.Bonds.fBond | B1 | ||
| BondLib.Bonds.eBond | B2 | ||
| BondLib.Junctions.J0p3 | J0p3_2 | ||
| BondLib.Bonds.eBond | B4 | ||
| BondLib.Bonds.fBond | B3 | ||
| BondLib.Thermal.mGSth | mGSth1 | ||
| WindVelocity | WindVelocity1 | ||
| Modelica.Blocks.Sources.Clock | Clock1 |