Adapt 'cd_b' for different window openings
Today cd_b
is hard coded at 0.6 - https://gitlab.cern.ch/cara/cara/-/blob/master/cara/models.py#L204
This is an avg value.
To be more physically sound, it should be different depending on the type of window opening - e.g. sliding windows, hinged windows, etc.
Come up with a range of cd_b
values depending on the window opening type.
This will have and impact on the model and UI
Use this approach: Discharge_coefficient_calculator.xlsx
Reference:
Simple model to compute discharge coefficient for top or bottom
hung hinged windows, in the absence of empirical test results
from manufacturers.
From an excel spreadsheet calculator (Richard Daniels, Crawford
Wright, Benjamin Jones - 2018) from the UK government -
see Section 8.3 of BB101 and Section 11.3 of
ESFA Output Specification Annex 2F on Ventilation opening areas.