A study on use of miniature dielectric compound parabolic concentrator (dCPC) for daylighting control application

A discussion of inner south projection angle for performance analysis of dielectric compound parabolic concentrator

“…Therefore, the main aim of this section is to investigate the correlation between inner south projection angle and optical performance of dielectric CPC for various solar azimuth angles, and for the comparison purpose the In this study, only the beam solar radiation is considered to investigate the angular performance of dielectric CPC, the optical efficiency and transmittance of a dielectric CPC for diffuse skylight is not quite related to south projection angle and could be approximately given from the geometrical concentration ratio (Rabl et al, 1980, Su et al, 2012a. The dimension and physical properties of selected dielectric CPC unit model and the setup for the simulation are the same as the one studied in the authors' previous research and summaried in Table 2 (Yu et al, 2014a). The ray-tracing software Photopia was employed to evaluate a truncated dielectric CPC from a full height CPC of 4.0 geometric concentration ratio, and the indicative parameters of optical efficiency and transmittance were used.…”

“…Sabry et al studied a PV-integrated dielectric CPC for transparent façade and elevated the influence of truncation percentage on the collective efficiency and concentration ratio of CPC (Sabry et al, 2013). The authors' recent research has discussed that the dielectric CPC has the potential for combined application of PV electricity generation and seasonal daylighting control due to its unique angular optical feature (Yu et al, 2014a).…”

“…Since a dielectric CPC may be used for combined application of daylighting and PV electricity generation (Yu et al, 2014a), the study of optical performance of dielectric CPC would be divided into two parts: the first one is optical efficiency, which is the ratio of received light on the base (onto which the solar cells are February, and the solar radiation could be collected almost all the time in these two days, low optical efficiency would be found at 5-6am and 18pm, this is mainly due to the incidence angle between sunlight and the normal of dielectric CPC front surface is close to 90°, such that sunlight would be mainly reflected by the CPC front surface. Additionally, the light path within the dielectric CPC on the east-west direction is much longer when the sun position is close to due east or west, therefore the optical absorption in the dielectric material could be considerable.…”

Controlling venetian blinds based on parametric design; via implementing Grasshopper’s plugins: A case study of an office building in Cairo

“…To overcome those obstacles, some daylighting systems have been practiced in order to improve daylighting performance inside buildings; such as light shelves [5], venetian blinds [6], louvers [6][7][8], optical louver system (OLS) [7], roller shutters, electrochromic glazing [9][10][11], thermotropic windows [12], translucent insulating panels [9], photo-bioreactors, prismatic glazing [13], light pipes [14], fibre optics [15], CPCs [13,15,16], light wells, and other complex fenestration systems [10,17,18].…”

Design and Analysis of an Optical Coupler for Concentrated Solar Light Using Optical Fibers in Residential Buildings

“…Yu et al [24] investigated the usage of miniature dielectric compound parabolic concentrators (DCPCs) for day lighting. Arnaoutakis et al showed raytracing simulations of a novel two-stage coupler that had a lens and a dielectric taper of the circular cross section that was directly attached to the optical fiber [25].…”