Parametric model of window-integrated planer Cassegrain concentrator-based shading system (PCSS)

Abstract

This study proposes a performance-driven design method for a new and novel, window-integrated planer Cassegrain concentrator shading system (PCSS) for daylight and energy applications. The integration process is complex and needs to address multi-disciplinary concerns, where the PCSS’s performance depends on system design and building geometries ensuring good solar gains. The method is rigorous yet adaptable to inform decision-making involving multiple stakeholders and promote the use of PCSSs as, window-integrated technology. The method contributes to engineering PCSS with respect to windows in a parametric model. A total of 3,750 designs are generated by controlling parameters related to the building (i.e., orientation, window-to-wall ratio (WWR), louvers’ tilt and number), and PCSS (i.e., modules number, mirrors’ shape and dimensions). The method is validated in an illustrative case study of a residential building in Madrid (Spain), where the performance is assessed in terms of annually-averaged electrical load match index (av.LMIEl), thermal load match index (av.LMITh), continuous daylight autonomy (cDA(500 lx)), and useful daylight illuminance (UDI(100–2000 lx)). Further, a sensitivity analysis is performed to investigate the relative significance of parameters. The method enables a performance-driven design of buildings and PCSSs and facilitates stakeholders for informed decision-making in projects concerning energy transition in buildings.