Investigation of Prismatic Daylight Collectors With Different Apexes

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
Allen Jong-Woei Whang ◽  
Chia-Min Lin ◽  
Shih-Chuan Yeh
Keyword(s):  
Ray Tracing ◽  
Intensity Distribution ◽  
Incident Angle ◽  
Apex Angle ◽  
Light Illumination ◽  
Natural Light ◽  
Relative Area ◽  
The Right ◽  
Ray Tracing Model

Prismatic elements are widely used in daylight illumination systems. The characteristics of the light that emerges from the surface of a right-angled prism vary with the apex of the prism and the incident angle of the sunshine illuminating the surface of the prismatic daylight collector. This paper investigates the effect of the apex angle of a right-angled prismatic collector on the performance of the collector using a matrix ray-tracing model and the edge principle. It was found that the majority of the light emerges from the hypotenuse of the right-angled prism when sunshine is incident on the surface of the prismatic daylight collector; furthermore, the flux of the light emerging from the hypotenuse that directs illuminating space decreases as the apex of the right-angled prism is increased. The intensity distribution of the majority of the light emerging from the hypotenuse of a right-angled prism can be used to guide the design of natural light illumination systems and enhance their performance. The percentage of light emerging from the hypotenuse decreases with the number of prismatic elements because the relative area of the emerging light that reaches the adjacent prism increases with the number of prismatic elements. The analysis of the relative area of the hypotenuse, where the emerging light that reaches the adjacent prism according to the edge ray principle shows that the total area is constant when the number of prismatic elements is greater than 10; an economical prismatic daylight collector can be realized with less material due to the larger number of smaller prisms with the same apex.

Distribution of Emerged Energy for Daylight Illuminate on Prismatic Elements

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Shih-Chuan Yeh ◽  
Allen Jong-Woei Whang ◽  
Horng-Ching Hsiao ◽  
Xi-Duo Hu ◽  
Yi-Yung Chen
Keyword(s):  
Light Beam ◽  
Ray Tracing ◽  
Intensity Distribution ◽  
Calculation Model ◽  
Light Illumination ◽  
Natural Light ◽  
Detailed Calculation ◽  
Illumination System ◽  
Beam Incident ◽  
The Right

Prismatic elements are typical devices of natural light illumination system for redirecting and collecting daylight. Based on the principles of optics, this paper presents a simple mathematical matrix ray-tracing methodology through which a detailed intensity distribution of parallel light beam incident onto a right angled prism from different incident angles can be calculated precisely. We also present the distribution of the secondary emerged intensity from a prism illuminated by the emerged light of an adjacent prism. The direction, concentration, and distribution of intensity of the emerged light from the parallel light incident onto a surface of the right-angle prism, as well as daylight illuminate on a prismatic collector, are precisely calculated. The detailed calculation of the emerged light re-incident onto the adjacent prism or emerged out of the prismatic element presented that most of daylight are directly emerged out and are confined in some directions at earlier morning and afternoon, and the emerged light re-incident into the adjacent prism at noon around. This detailed calculation model of parallel light beam incident to a prismatic element can be applied to the hybrid natural light illumination system, as well as to the prism-relative solar illumination system for the improvement of efficiency.

INTERCOMPARATIVE STUDY OF LONG-YEAR WAVE HINDCASTING DATA SAMPLES BY USE OF BACKWARD RAY TRACING MODEL AND SWAN MODEL UNDER MSM-BASED WINDS CONDITION PROVIDED BY JMA

2018 ◽  
Vol 74 (4) ◽  
pp. I_457-I_462
Author(s):  
Masataka YAMAGUCHI ◽  
Hirokazu NONAKA ◽  
Yoshio HATADA ◽  
Yoshihiro UTSUNOMIYA ◽  
Kunimitsu INOUCHI ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Swan Model ◽  
Wave Hindcasting ◽  
Ray Tracing Model

Evaluation of Empirical Ray-Tracing Model for an Urban Outdoor Scenario at 73 GHz E-Band

2014 ◽  
Author(s):  
Huan Cong Nguyen ◽  
George R. MacCartney ◽  
Timothy Thomas ◽  
Theodore S. Rappaport ◽  
Benny Vejlgaard ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Ray Tracing Model

Generalized Ray-tracing Model for Modified Geodesic Luneburg Lens Antennas

2021 ◽  
Author(s):  
Qingbi Liao ◽  
Francisco Mesa ◽  
Oskar Zetterstrom ◽  
Nelson J. G. Fonseca ◽  
Oscar Quevedo-Teruel
Keyword(s):  
Ray Tracing ◽  
Lens Antennas ◽  
Luneburg Lens ◽  
Ray Tracing Model

scholarly journals A Novel Technique for Mapping the Vascularity of Labia Minora Prior to Labiaplasty: Cold Light Illumination

2018 ◽  
Vol 78 (08) ◽  
pp. 775-784 ◽  
Author(s):  
Aski Kaya ◽  
Ozan Dogan ◽  
Murat Yassa ◽  
Alper Basbug ◽  
Eray Çalışkan
Keyword(s):  
Light Source ◽  
Outer Surface ◽  
Descriptive Study ◽  
Light Illumination ◽  
Labia Minora ◽  
Novel Technique ◽  
Group A ◽  
The Right ◽  
Upper Third

Abstract Objective Aim of the study was to assess the feasibility of a novel technique to determine the vascularity of labia minora prior to labiaplasty. Methods A cold light source employed in laparoscopic procedures was used to illuminate the outer surface of the labia minora as described in this prospective descriptive study. Results Of the patients, 46.1% (n = 41) had upper third prominence, 36% (n = 32) had middle third prominence, and 18% (n = 16) had lower third prominence according to the Banwell classification of morphologies. Right labia minora width was 0 – 2 cm in 51.7% (n = 46), 2 – 4 cm in 47.2% (n = 42) and > 4 cm in 1.1% (n = 1) of cases. Left labia minora width was 0 – 2 cm in 52.8% (n = 47), 2 – 4 cm in 41.6% (n = 37) and > 4 cm in 5.6% (n = 5) of cases. The incidence of Anterior 2 and Posterior 1 vessels in the different morphologies were statistically significantly different (p = 0.007, p = 0.018). The Anterior 2 vessel was higher in the lower morphology group whereas the Posterior 1 vessel was higher in the upper morphology group. A central vessel was observed in 93.3% (n = 83) of patients in the left labium minus and the right labium minus. The incidence of the Posterior 1 vessel was significantly higher in the left labium minus than in the right labium minus (p = 0.021). Discussion This novel technique to assess labial vascularity using a cold light source could be very useful to reduce dehiscence by avoiding excessive resection of highly vascularized tissue. Most units can easily access a cold light source, which can be used to assess labial vascularity prior to labiaplasty.

A novel design freeform reflector application applied to natural light illumination system

2021 ◽  
Author(s):  
Min-Yih Leu ◽  
Jong-Woei Whang ◽  
Yi-Yung Chen ◽  
Tzu-Chun Huang ◽  
Hsi-Chi Chen
Keyword(s):  
Light Illumination ◽  
Natural Light ◽  
Illumination System ◽  
Novel Design
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