Revised Indoor-Side Convection Coefficients for Complex Fenestration Systems with Roller Blinds (LV-17-C080)

ASHRAE research project RP-1311 concluded with the creation of simulation models, the ASHWAT models, for complex fenestration systems (CFS) – glazing systems with attachments such as shades and insect screens. In these models, radiant flux – solar beam/diffuse or longwave –is on a layer-to-layer basis. ASHWAT also takes into account the convective heat transfer between the CFS layers. Methods to obtain convection coefficients for glazing cavities are well established, even for a cavity that includes a venetian blind. In this paper, a new numerical technique is applied to generate new convection coefficients for complex fenestration systems.