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Assessing the energy saving potential of anidolic system in the tropics

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Abstract

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%).

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Abbreviations

AS:

anidolic system

Awin :

window area

CL:

clerestory

Cx_Ay_wz:

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

DF:

daylight factor

dT:

temperature difference

ECHTC:

external convective heat transfer coefficient

eAd:

Adaptive Algorithm for external convective heat transfer coefficient

eDO:

DOE-2 for external convective heat transfer coefficient

eTA:

TARP for external convective heat transfer coefficient

eMo:

MoWiTT for external convective heat transfer coefficient

E i :

indoor illuminance

E o :

outdoor illuminance

ε room :

indoor surface emissivity

ε win :

interior window surface emissivity

F win-room :

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

HS:

horizontal shading

ICHTC:

internal convective heat transfer coefficient

iA:

Adaptive Algorithm for internal convective heat transfer coefficient

iT:

TARP for internal convective heat transfer coefficient

IS WS:

intermediate sky with the sun

QIR :

net heat transfer from the window to the room surfaces

T i :

indoor air temperature

T o :

outdoor (ambient) air temperature

WFR:

window to floor area ratio

x_AS:

anidolic system installed on x-m-wide room

x_Ay:

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

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Acknowledgements

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.

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Authors and Affiliations

  1. Department of Architecture, Atma Jaya Yogyakarta University, Jl. Babarsari 44, Yogyakarta, 55281, Indonesia

    Floriberta Binarti & Prasasto Satwiko

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  1. Floriberta Binarti
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  2. Prasasto Satwiko
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Correspondence to Floriberta Binarti.

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Appendix

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Fig. 12
figure 12

Field measured and simulated indoor illuminances of base model (equipped with clerestory only) (a and b), model with AS1 (c), and model with AS2 (d)

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Binarti, F., Satwiko, P. Assessing the energy saving potential of anidolic system in the tropics. Energy Efficiency 11, 955–974 (2018). https://doi.org/10.1007/s12053-017-9603-7

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