Preliminary Results on Luminaire Designs for Hybrid Solar Lighting Systems

Abstract We report on the design of two hybrid lighting liminaires that blend light from a fiber optic end-emitted solar source with electric T8 fluorescent lamps. Both designs involve the retrofit of a commercially-available recessed fluorescent luminaire with minimal reductions in the original luminaire’s optical efficiency. Two methods for high-angle dispersion of fiber optic end-emitted solar light are described and the resulting spatial intensity distributions, simulated using ZEMAX, are compared with standard cylindrical fluorescent tubes. Differences in spatial intensity distribution are qualitatively characterized and potential design improvements discussed.

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Performance of New Hybrid Solar Lighting Luminaire Design

Solar Energy ◽

10.1115/isec2003-44014 ◽

2003 ◽

Cited By ~ 5

Author(s):

Dennis D. Earl ◽

L. Curt Maxey ◽

Jeff D. Muhs ◽

Robert R. Thomas

Keyword(s):

Light Source ◽

Intensity Distribution ◽

Fiber Optic ◽

Optical Elements ◽

Optical Efficiency ◽

Spatial Intensity Distribution ◽

Spatial Intensity ◽

Fluorescent Lamps ◽

Quantitative Measurements ◽

Solar Lighting

We report on the performance of a new hybrid luminaire designed to blend light from a fiber optic solar source with electric fluorescent lamps. The luminaire design studied involves a commercially-available fluorescent luminaire that had been modified to include optical elements for efficiently dispersing a fiber optic solar light source. Quantitative measurements of the hybrid luminaire’s optical efficiency and spatial intensity distribution/deviations are discussed. The effects of static differences and dynamic fluctuations in spatial intensity distribution are qualitatively discussed and potential design improvements examined.

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The Use of Spatial Intensity Distribution Analysis to Examine G Protein-Coupled Receptor Oligomerization

G-Protein-Coupled Receptor Dimers ◽

10.1007/978-3-319-60174-8_2 ◽

2017 ◽

pp. 15-38 ◽

Cited By ~ 1

Author(s):

Richard J. Ward ◽

Sara Marsango ◽

John D. Pediani ◽

Graeme Milligan

Keyword(s):

G Protein ◽

Intensity Distribution ◽

Distribution Analysis ◽

G Protein Coupled Receptor ◽

Spatial Intensity Distribution ◽

Spatial Intensity ◽

Receptor Oligomerization ◽

G Protein Coupled

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A Thermal Model of a Fiber Optic Bundle for a Hybrid Solar Lighting System

Energy Conversion and Resources ◽

10.1115/imece2005-80009 ◽

2005 ◽

Cited By ~ 2

Author(s):

Michael J. Cheadle ◽

Gregory F. Nellis ◽

Sanford A. Klein ◽

William A. Beckman

Keyword(s):

Energy Consumption ◽

Thermal Model ◽

Fiber Optic ◽

Management Strategies ◽

Design Tool ◽

Lighting Energy ◽

Solar Lighting ◽

Reduce Energy Consumption ◽

Lighting Systems ◽

Cooling Loads

Hybrid solar lighting (HSL) systems distribute natural sunlight to luminaires located in office or retail buildings in order to reduce energy consumption associated with conventional lighting systems. HSL systems reduce energy consumption directly by reducing the lighting energy and indirectly by reducing the associated cooling loads. A key component of the HSL system is the fiber optic bundle (FOB) that transmits the light from the collector to the luminaire. The observed thermal failure of the FOB when exposed to concentrated sunlight has motivated the development of a thermal model of this component. This paper describes the development of a predictive thermal model of the heat transfer in an FOB for an HSL system. The model is verified experimentally against temperature measurements obtained in the lab under controlled conditions and provides a powerful design tool that can be used to evaluate alternative thermal management strategies.

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Laser light scattering in turbid media Part I: Experimental and simulated results for the spatial intensity distribution

Optics Express ◽

10.1364/oe.15.010649 ◽

2007 ◽

Vol 15 (17) ◽

pp. 10649 ◽

Cited By ~ 78

Author(s):

Edouard Berrocal ◽

David L. Sedarsky ◽

Megan E. Paciaroni ◽

Igor V. Meglinski ◽

Mark A. Linne

Keyword(s):

Light Scattering ◽

Intensity Distribution ◽

Laser Light ◽

Laser Light Scattering ◽

Turbid Media ◽

Spatial Intensity Distribution ◽

Spatial Intensity

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Spatial intensity distribution analysis quantifies the extent and regulation of homodimerization of the secretin receptor

Biochemical Journal ◽

10.1042/bcj20170184 ◽

2017 ◽

Vol 474 (11) ◽

pp. 1879-1895 ◽

Cited By ~ 17

Author(s):

Richard J. Ward ◽

John D. Pediani ◽

Kaleeckal G. Harikumar ◽

Laurence J. Miller ◽

Graeme Milligan

Keyword(s):

G Protein ◽

Intensity Distribution ◽

Transmembrane Domain ◽

Distribution Analysis ◽

Wild Type ◽

Spatial Intensity Distribution ◽

Spatial Intensity ◽

Secretin Receptor ◽

Dimeric Form ◽

Type Receptor

Previous studies have indicated that the G-protein-coupled secretin receptor is present as a homodimer, organized through symmetrical contacts in transmembrane domain IV, and that receptor dimerization is critical for high-potency signalling by secretin. However, whether all of the receptor exists in the dimeric form or if this is regulated is unclear. We used measures of quantal brightness of the secretin receptor tagged with monomeric enhanced green fluorescent protein (mEGFP) and spatial intensity distribution analysis to assess this. Calibration using cells expressing plasma membrane-anchored forms of mEGFP initially allowed us to demonstrate that the epidermal growth factor receptor is predominantly monomeric in the absence of ligand and while wild-type receptor was rapidly converted into a dimeric form by ligand, a mutated form of this receptor remained monomeric. Equivalent studies showed that, at moderate expression levels, the secretin receptor exists as a mixture of monomeric and dimeric forms, with little evidence of higher-order complexity. However, sodium butyrate-induced up-regulation of the receptor resulted in a shift from monomeric towards oligomeric organization. In contrast, a form of the secretin receptor containing a pair of mutations on the lipid-facing side of transmembrane domain IV was almost entirely monomeric. Down-regulation of the secretin receptor-interacting G-protein Gαs did not alter receptor organization, indicating that dimerization is defined specifically by direct protein–protein interactions between copies of the receptor polypeptide, while short-term treatment with secretin had no effect on organization of the wild-type receptor but increased the dimeric proportion of the mutated receptor variant.

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Spatial intensity distribution of the radiative return from scattering media irradiated by a cw laser beam

10.1117/12.2261412 ◽

2017 ◽

Cited By ~ 1

Author(s):

Ljuan L. Gurdev ◽

Tanja N. Dreischuh ◽

Orlin I. Vankov ◽

Eleonora N. Toncheva ◽

Lachezar A. Avramov ◽

...

Keyword(s):

Laser Beam ◽

Intensity Distribution ◽

Scattering Media ◽

Spatial Intensity Distribution ◽

Spatial Intensity ◽

Cw Laser ◽

Radiative Return

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Cost-Effective Light-Mixing Module for Solar-Lighting System Appended With Auxiliary RGBW Light-Emitting Diodes

Journal of Solar Energy Engineering ◽

10.1115/1.4037746 ◽

2017 ◽

Vol 139 (6) ◽

Author(s):

An Chi Wei ◽

Shih Chieh Lo ◽

Ju-Yi Lee ◽

Hong-Yih Yeh

Keyword(s):

Light Source ◽

Light Emitting Diodes ◽

Cylindrical Tube ◽

Cost Effective ◽

Lighting System ◽

Optical Efficiency ◽

Light Emitting ◽

Solar Lighting ◽

Lighting Systems ◽

Main Components

A light-mixing module consisting of a compound parabolic concentrator (CPC) and a light-mixing tube is proposed herein to realize a uniform and efficient solar-lighting system. In this lighting system, the sunlight collected into a fiber and then guided to an indoor destination is the principal light source, while an auxiliary light source including multiple red, green, blue, and white (RGBW) light-emitting diodes (LEDs) is controlled by an auto-compensating module. To mix the principal and the auxiliary sources and to realize the uniform illumination, the light-mixing tube was coated with BaSO4 and optimized as a cylindrical tube. The design of the light-mixing tube is described and discussed in this article. According to the simulated results, the uniformity and the optical efficiency of the designed light-mixing tube are 82.9% and 85.7%, respectively, while from the experimental results, the uniformity of 85.9% and the optical efficiency of 83.3% have been obtained. In terms of the common indoor-lighting standards and the specifications of commercial components used in lighting systems, the proposed light-mixing module has demonstrated the high uniformity and acceptable optical efficiency. Additionally, since the main components of the light-mixing module can be designed as plastic optics, a cost-effective light-mixing module and a profitable lighting system can be realized. Thus, the performance and the price of the proposed light-mixing module fit the demands of the illumination market, while the proposed system shows the potential for indoor solar-lighting applications.

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