Spreadsheet-based calculation tool for direct daylight illuminance adaptable for different glazing properties and sky models

Lowry, Gordon; Thomas, Shaun A.

doi:10.1016/j.buildenv.2009.09.017

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…The angle of incidence had to be smaller than the critical angle so as to not cause total reflection and loss of energy [10,11]. The material for freeform lenses in this design was polymethylmethacrylate (PMMA), with a refraction index of 1.4935.…”

Section: Calculationsmentioning

confidence: 99%

Innovative design of light collimator based on a freeform microlens array

Wang

Chen

et al. 2014

Appl. Opt.

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In developing a daylighting system, the overall system efficiency is crucial. In the daylighting system, whether the light propagates parallel strongly affects the efficiency. In this paper, we simulate a multicurvature lens to collimate rays propagated from different angles. We describe a method based on a freeform microlens array, which increases transmission efficiency. Results show that with the freeform microlens array collimator, the light propagates provide at least 50.26% parallel and the efficiency increases by 24.76%, enhancing the core values of the daylighting system in building illumination.

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Section: Calculationsmentioning

confidence: 99%

Innovative design of light collimator based on a freeform microlens array

Wang

Chen

et al. 2014

Appl. Opt.

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“…Wittkopf et al presented a method to derive the luminous intensity distribution curves of anidolic daylighting systems based on a ray tracing model. [20][21][22] The characteristics of the light emerging from a passive prismatic daylight collector, which is composed of right-angled prisms with different apexes, have been presented for a parallel light beam incident on it from different directions to represent the incident daylight over the course of a day based on a mathematical matrix model. 19 The detailed analysis of the light emerging from a prismatic daylight collector will help to improve the performance of natural lighting systems and daylight hybrid systems.…”

Section: Introductionmentioning

confidence: 99%

A natural lighting system using a prismatic daylight collector

Yeh

2014

Lighting Research & Technology

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In this paper, a natural lighting system composed of a tilted prismatic daylight collector, an outdoor reflector and an indoor diffuse reflector is described. The light emerging from the hypotenuse of the prismatic daylight collector is redirected onto the indoor reflector for natural light illumination. The results of measured illuminances are in agreement with the results of calculation. The prismatic daylight collector not only decreases discomfort glare but also collects daylight for the natural lighting system. The open natural lighting system, which uses less material, can be realized by the detailed analysis of the characteristics of the light emerging from the hypotenuse of the prismatic daylight collector for sunlight incident on the collector.

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IEQ assessment on schools in the design stage

Cătălina

Iordache

2012

Building and Environment

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Spreadsheet-based calculation tool for direct daylight illuminance adaptable for different glazing properties and sky models

Cited by 6 publications

References 18 publications

Innovative design of light collimator based on a freeform microlens array

Innovative design of light collimator based on a freeform microlens array

A natural lighting system using a prismatic daylight collector

IEQ assessment on schools in the design stage

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