Among-shoot variability and leaf-specific absorptance
characteristics affect diel estimates of in situ electron transport of Posidonia australis.
A light weave fabric with appropriate visible light transmittance and low absorptance
is recommended to allow more sunlight into the classroom, while reducing cooling loads.
where [tau] is the transmittance of the calorimeter window (unity when no window is used) and a is the absorptance
of the cavity.
For the diffuse radiation transmitted through the windows and direct reflected solar gains, three methods are considered: area ratio, absorptance
weighted area ratio, and radiosity.
081 Layer Solar Solar Absorptance
, Reflectance, a [rho] Low-e 0.
other_i] is view factor from other surface to surface i, a is the absorptance
2] hr [degrees] hr [degrees] hr [degrees] F) F) F) Solar 61% 61% 47% Transmittance (Assembly) Absorptance
5% 17% 14% (IP) Visual 81% 78% 77% Transmittance
The effective solar absorptance
of the panel (including the area between cells) is increased by selecting black PV module backsheet.
A solar collector having a copper tube on an aluminium sheet absorber with absorptance
94% [+ or -] 2% and emittance 5% [+ or -] 2% was used for this study (EnerWorks 2007).
where [alpha] is the mean solar absorptance
of the BIPV/T roof, I is the incident solar radiation, A is the roof area, [E.
Visible (daylight) and solar transmittance, reflectance and absorptance
as well as shading thermal resistance are major parameters that will determine thermal and lighting performance.
The method requires bidirectional optical measurements of nonspecular layers such as shades or blinds, use of optical data for specular glass layers, and matrix layer calculations to combine these individual layer properties to produce overall window system transmittances and layer absorptances
from which solar gains can be computed as a function of incident direction.
2 (2005) required an Optics5 output of integral properties to compute angular dependent transmittances, reflectances, absorptances
, and solar heat gain coefficients (SHGCs) (or total solar energy transmittance).