Why use frads

Matrix algebraic methods reduce the time needed to perform accurate, ray-tracing based, annual daylight simulations by several orders of magnitude. A good deal of expertise is needed to set up the simulations properly to achieve the desired level of accuracy. frads provides users with tools (e.g., mrad) that automatically determine which matrix-based method to use then sets the associated simulation parameters, helping beginners learn the different matrix methods by observing the tools’ behavior. The user is still required to understand basic concepts underlying matrix-based simulation methods (see tutorials).

Matrix-based methods also enable accurate, ray-tracing generated, irradiance, illuminance, and luminance data to be available for run-time data exchange and co-simulations. frads provides users with tools that generate the appropriate Radiance-generated data then interfaces with the “actuator” EMS module in EnergyPlus or within the Spawn-of-EnergyPlus and Modelica co-simulation environment. This enables end users to evaluate the performance of buildings with manual- and automatically-controlled shading and daylighting systems or other site and building features that can change parametrically or on a time-step basis.