Digital Dynamic Simulation in Plant Bio-Engineering
Glazing
Glazing
This page collects the glazing-related parts of CUC04 and CUC05, including optical properties, transmitted radiation, and daily optical coefficients.
The page combines glazing optical properties, direct and diffuse radiation models, annual solar indicators, and transmitted solar radiation through a horizontal film sheet.
Matlab sources are preserved in matlab-source/cuc04. The browser version keeps the original equations and presents them with interactive inputs and charts.
CUC04
Optical properties of glazing
Based on incident angle, refractive index, extinction coefficient, and glazing thickness.
CUC05
Sun position and transmitted radiation
Combines solar geometry, radiation, and glazing transmission through a 24-hour cycle.
Location and date parameters
Controls solar altitude, azimuth, and the daily sun path.
Atmosphere and radiation parameters
Controls outdoor and under-cover direct and diffuse radiation.
Time (hr)
Direct outdoor
Diffuse outdoor
Direct under glazing
Diffuse under glazing
Time (hr)
Transmissivity
Reflectivity
Absorptivity
Optical Equations
Fresnel and absorption terms
RFcal computes reflected fractions from incident angle and refractive index.
AB = exp(-FK * FL / cos(θ′)) controls attenuation through the glazing, where θ′ is the refracted angle inside the cover material and AB is the transmittance loss factor caused by absorption in the material.
CUC04 and CUC05 both use transmissivity, reflectivity, and absorptivity relations based on repeated internal reflection.
TAU = AB * (1 - RF)2 / (1 - RF2 * AB2), RHO = RF * (1 + TAU * AB), ALPHA = 1 - TAU - RHO.
FL is cover thickness in mm, FK is extinction coefficient in mm-1, and FN is refractive index.
RF, AB, TAU, RHO, and ALPHA are dimensionless fractions for reflection, absorption loss, transmissivity, reflectivity, and absorptivity.
