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Trends in Applied Sciences Research
Year: 2011  |  Volume: 6  |  Issue: 4  |  Page No.: 345 - 363

Advanced Lighting Simulation Tools for Daylighting Purpose: Powerful Features and Related Issues

R.G. Bhavani and M.A. Khan    

Abstract: This study investigates the powerful features and related issues of advanced lighting simulation tools as applicable to daylighting projects. Advanced lighting simulation tools are used to see how light behaves in a building. They are also useful alternatives in situations where placement and maintenance of sensors is costly option. These tools play an effective role in daylighting projects thus contributing to creating energy efficient buildings. Challenges of sky modelling, time complexity of software towards real time control applications, validation and energy simulation are some of the related issues. This study presents a detailed literature on the tools available in the market and reports about the previous works based on them. Also demonstrated are the systematic procedures of simulation with the corresponding values and parameters. The model accommodating the dynamic features of a daylighting project was built by a lighting simulation software, Relux Pro, 2004. It was shown that Relux was able to model indoor daylight illuminances accurately for CIE sky conditions, L-type geometry and room configuration. The wide range of reflectances and transmittances are also supported by Relux for mimicking real world glazing surfaces and materials. Outputs such as 3D representation, isolux curves and evaluation, luminance distribution, table outputs, 3D mountain plot of illuminance and solar altitude graph are also illustrated. These powerful features give a better perspective of how daylight behaves within the room. Results showed that the test space can be illuminated by pure daylight for most part of the year due to higher sunshine probability.

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