modelCWveg
Evaporation of the vegetation
Extends from BondLib.Interfaces.TwoPort (Partial model invoking two bondgraphic connectors).
Information
This model computes the evaporation of the vegetation. It uses the generic evaporation model together with an internal modulation computing the conductance of evaporation.
Parameters: ag: Ground area of Biosphere (default value = 2368.9 m2) hai: Convection coefficient equation intercept (default value = 39.6 kJ/(h.m2.K)) avix: Portion of Biosphere covered by vegetation (default value = 0.4) laix: Leaf area index (default value = 2) lambda: Latent heat of vaporization (default value = 2501 kJ/kg_water) rg: Specific ground resistance of evaporation to vapor diffusion (default value = 0.0278 h.m2/kg_air) b1: Stomatal resistance coefficient (default value = 20.3 kJ/kg_air) b2: Specific canopy light reflection (default value = 61.2 kJ/(h.m2)) taux: Light adjustment factor (default value = 1) taup: Canopy light extinction coefficient (default value = 0.6) pao: Atmospheric pressure (default value = 87.848 kPa)
References:
- American Society of Heating, Refrigerating and Air-Conditioning Engineers (1997), ASHRAE Handbook of Fundamentals.
- Air Psychrometrics
- Kimball, B.A. (1986), A Modular Energy Balance Program Including Subroutines for Greenhouses and Other Latent Heat Devices, United States Department of Agriculture, ARS-33.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.SIunits.Area | ag | 2368.9 | Ground area of Biosphere |
| Real | hai | 39.6 | Convection coefficient equation intercept |
| Real | avix | 0.4 | Percetage of Biosphere covered by vegetation |
| Real | laix | 2 | Leaf area index |
| Real | lambda | 2501.0 | Latent heat of vaporization |
| Real | rg | 0.0278 | Specific ground resistance of evaporation to vapor diffusion |
| Real | b1 | 20.3 | Stomatal resistance coefficient |
| Real | b2 | 61.2 | Specific canopy light reflection |
| Real | taux | 1 | Light adjustment factor |
| Real | taup | 0.6 | Canopy light extinction coefficient |
| Real | pao | 87.848 | Atmospheric pressure |
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 | ca | Specific heat capacity of moist air | |
| Real | so | Specific solar input to canopy | |
| Real | R0 | Specific boundary layer resistance of vegetation due to evaporation | |
| Real | R1 | Specific stomatal resistance of evaporation of vegetation | |
| Real | G0 | Specific boundary layer conductance due to evaporation | |
| Real | G | Boundary layer conductance of evaporation | |
| Real | G2 | Bondgraphic conductance | |
| mGSev | mGSev1 | ||
| SolarInput | SolarInput1 | ||
| Modelica.Blocks.Sources.Clock | Clock1 |