Assessing the energy saving potential of anidolic system in the tropics
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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%).
KeywordsAnidolic system Daylight factor Indoor illuminance distribution Solar heat gain Tropics
y-m-wide, z-degree-angular spread anidolic collector installed on a x-m-height clerestory
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 surface emissivity
interior window surface emissivity
view factor from the window to the other surfaces of the room
internal convective heat transfer coefficient
Adaptive Algorithm for internal convective heat transfer coefficient
TARP for internal convective heat transfer coefficient
- IS WS
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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