For each case the linear thermal transmittance based on external dimensions was calculated (in accordance with EN/ISO 10211:2007 [ISO 2007b]).
In addition, the thermal transmittance of the window is calculated using ISO 10077-2:2012 (ISO 2006, 2012) so the results can be compared with other similar studies performed in different countries.
The table exhibits a relatively small sensibility of transparency and transmittance of different CDAs (the last three columns) to changes in column concentrations of trace gases.
To investigate how W affects broadband transmittance through a hypothetical atmosphere consisting of water vapour only, we have to use some kind of radiative transfer model.
This can be used to explain why the change in the transmittance of natural snowcovered ice was dominated not only by the thickness but also by the stratigraphy, and why the bare ice in Peipsi had the smallest transmittance compared with other cases.
Light transmittance through snow-covered ice is primarily determined by the total thickness of snow and slush ([T.
2] * K) to the thermal transmittance of the roof construction, was calculated.
According to the results of measuring and calculations (Table 3), an empiric equation to calculate the correction of thermal transmittance value of the thermal insulation layer with air gaps was derived.
This was done until the linear and center-of-glazing thermal transmittances
The final forms of the diffuse reflectance and diffuse transmittance
can be written as follows, respectively:
The design variables considered in the model include building location, window size (expressed as window-to-wall ratio: WWR), glazing visible transmittance
, shading transmittance
and window orientation.
were simulated using steadystate boundary conditions, constant material properties, and contact resistances.