AN-04-06-4 – Estimating the Solar Heat and Thermal Gain from a Window with an Interior Venetian Blind PDF

This study gives correlations useful in predicting heat transfer from the indoor glazing surface of a window with an adjacent interior venetian blind. Data were produced using a steady-state, laminar, two-dimensional, conjugate conduction/convection/ radiation finite element model of a vertical isothermal surface with heated, horizontal, and rotatable louvers. Using that model, the radiative and convective heat transfer from the surface (i.e., the indoor glass) has been examined with respect to six variables: blind to glass spacing, blind slat angle, irradiation level, glass temperature, and blind and glass emissivity. Data have been presented in two forms: as the best statistical fit for use in software applications and in table format. An example of how these correlations could be used to predict solar heat gain and U-factor has been included with a comparison to calorimetrically obtained data. Results correlate well with calorimetric data.

Units: SI