Heat transfer coefficients are defined by a radiative and a convective part; in TrnBuild, the convective part can be entered. How to input the radiative part ?
All surfaces are assumed to be black for long wave radiative exchange and radiative internal gains for surfaces inside the zone. This is a good approximation for most real world cases (exceptions would be huge mirrors or stainless steel panels at inside surfaces or windows with low-E coatings towards the zone). It is not possible to change this assumption easily in type 56. A possible workaround would be to define additional wall gains, but it is usually not worth the effort. All external surfaces are assumed to be grey (E=0.9) for longwave radiation exchange with the sky. The values of longwave emissivity for windows are taken from the “w4-lib.dat” file.
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