Iason Konstantzos

An integrated method and web tool to assess visual environment in spaces with window shades

The current article presents a synthesis of the most recent metrics (visual comfort autonomy, lighting energy use, and view clarity) for assessing the visual environment performance of spaces with window shades, in the form of an integrated framework—interactive web-based tool. A daylighting and glare simulation model is used to calculate interior daylight distributions, luminance mapping, and annual spatial visual performance metrics. Then, a decision strategy was developed for selecting fabric properties based on different priorities: maximizing outside view, maximizing energy performance, or a balanced approach with fixed or flexible criteria to avoid compromises, all under visual comfort constraints. The models and decision strategies were implemented into a web-based tool, which includes a database of different design configurations (climate, envelope configuration, orientation, glazing size and properties, comfort restrictions, occupant view directions, etc.) and either provides recommendations for selecting shade properties based on the variation of the three visual performance metrics, or compares different configurations with detailed output information. The tool, under further development, is currently available to the public and can be used to obtain preliminary information about the comfort, energy, and view clarity performance of spaces will roller shades, without the need of high expertise or complex simulations.