Software based on one-dimensional heat transfer models is widely used for the design and rating of fenestration. Simple heat transfer models for unshaded glazing configurations are well-established and have been validated experimentally. In contrast, much less research has been done to develop reliable models for so-called "complex fenestration", which include the effect of common shading devices. Shades such as drapes, louvered blinds, and roller blinds can interact with the convective flow and act as a shield to thermal radiation. Some recent studies have shown that the effect on U-value can be substantial.In the current study, a CFD model is developed of the conjugate heat transfer in a double glazed window with a between-panes metal blind. The results of a parametric study are used to generate an empirical correlation for the average Nusselt number, which is needed for use in one-dimensional models. Sample results are presented to illustrate the accuracy of a simple one-dimensional analysis, which would be suitable for incorporation into existing window thermal analysis programs.
展开▼
