Assessing the energy saving potential of anidolic system in the tropics

Original Article


Employing the edge-ray principle, the anidolic system (AS) has been proven as a promising daylighting solution for various climates. However, studies on the thermal performance of an AS are still rare. Because of the dominant contribution of the space-cooling load to building energy consumption at the operational stage in hot climates, knowledge of the impact of AS application on the space-cooling load is important. This study assessed the energy-saving potential of AS in the tropics by measuring the daylight level and distribution, as well as the solar heat gain, based on Radiance and EnergyPlus simulations using weather files of two locations in the tropics—Yogyakarta and Singapore. Monitoring data of a full-scale, unoccupied test building was acquired to validate the Radiance simulations and EnergyPlus models. A comparison between the energy-saving potential for lighting and cooling of AS and conventional aperture models showed that the application of AS in the tropics benefits the daylighting performance (DF ≥ 3% and horizontal distribution 51–70%), but still produces higher solar heat gains (44–437% higher than those of clerestory only). Narrow anidolic collectors with medium angular spread (45°–52°) and maximum clerestory height equipped with internal shelves can be applied to produce lower solar heat gain or indoor air temperature (2%) with sufficient daylight levels (≥ 2%) and an increased in horizontal illuminance distribution (> 57%).


Anidolic system Daylight factor Indoor illuminance distribution Solar heat gain Tropics 



anidolic system


window area




y-m-wide, z-degree-angular spread anidolic collector installed on a x-m-height clerestory


daylight factor


temperature difference


external convective heat transfer coefficient


Adaptive Algorithm for external convective heat transfer coefficient


DOE-2 for external convective heat transfer coefficient


TARP for external convective heat transfer coefficient


MoWiTT for external convective heat transfer coefficient


indoor illuminance


outdoor illuminance


indoor surface emissivity


interior window surface emissivity


view factor from the window to the other surfaces of the room


horizontal shading


internal convective heat transfer coefficient


Adaptive Algorithm for internal convective heat transfer coefficient


TARP for internal convective heat transfer coefficient


intermediate sky with the sun


net heat transfer from the window to the room surfaces


indoor air temperature


outdoor (ambient) air temperature


window to floor area ratio


anidolic system installed on x-m-wide room


x-m-wide anidolic system installed on y-m-wide room



Authors gratefully acknowledge the Directorate of Higher Education Republic Indonesia, Ministry of Research, Technology and Higher Education in the scheme of Hibah Bersaing (the second year) under the contract number 005/HB-LIT/III/2015 (Government to University) for supporting this study.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of ArchitectureAtma Jaya Yogyakarta UniversityYogyakartaIndonesia

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