modelCorG_ASHRAE140
Correction of the solar gain factor according to ASHRAE 140
Extends from PartialCorG (partial model for correction of the solar gain factor).
Information
Overview
This model computes the transmission correction factors for solar radiation through a double pane window depoending on the incidence angle, based on the ASHRAE140-2017.
Known Limitations
The model is directly paramtrized for a double pane window.
References
- ASHRAE140-2017 Informative Annex B6
- Heating and Cooling of Buildings, Priciples and Practice of Energy Efficient Design (p.142)
- April 24, 2020, by Konstantina Xanthopoulou:
First Implementation. - This is for #889.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | n (from PartialCorG) | 1 | vector size for input and output |
| Modelica.Units.SI.CoefficientOfHeatTransfer | Uw (from PartialCorG) | 3 | Thermal transmission coefficient of whole window |
| Real | g (from PartialCorG) | 0.7 | Coefficient of solar energy transmission |
| Real | INDRG | 1.526 | Index of refraction of Glass, in this case INDRG= 1.526 |
| Real | p | 2 | number of panes of glass, in this case p = 2 |
| Real | TH | 3.175 | Thickness of glass, in this case TH = 3.175 mm |
| Real | K | 0.0196 | Extintion coefficient, in this case K = 0.0196/mm |
| Real | Rout | 0.0476 | Exterior combined heat transfer coefficient |
| Real | RairGab | 0.1588 | Heat transfer coefficient of air gap |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Utilities.Interfaces.SolarRad_in[n] | SR_input (from PartialCorG) | ||
| Modelica.Blocks.Interfaces.RealOutput[n] | solarRadWinTrans (from PartialCorG) | transmitted solar radiation through window |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Real | AOI | Angle of incidence | |
| Real | AOI_help | ||
| Real | AOR | Angle of refraction | |
| Real | RPERP | Perpendicular reflectance(component of polarization) | |
| Real | RPAR | Parallel reflectance(component of polarization) | |
| Real | R | Reflectance | |
| Real | Trn | Transmittance due to reflectance losses(transmittance if there were just reflectance losses and no absorptance losses) | |
| Real | Tabs | Transmittance due to absorptance losses(transmittance if there were just absorptance losses and no reflectance losses) | |
| Real | L | Path length | |
| Real | T | Total transmittance Tr*Tabs | |
| Real | S | Inward flowing portion of the absorbed radiation in window panes | |
| Real | SHGC | Solar heat gain coefficient | |
| Modelica.Blocks.Tables.CombiTable1Ds | combiTable1Ds | ||
| Real | y | ||
| Modelica.Blocks.Sources.RealExpression | realExpression |