Modeling the aerosol effects on the light field below a tubular-pipe: A case of clear sky conditions

Kocifaj, Miroslav; Kómar, Ladislav; Kohút, Igor

doi:10.1016/j.solener.2014.05.024

Cited by 2 publications

(2 citation statements)

References 42 publications

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“…The research by Vasilakopoulou [26] further pointed out that the average internal illuminance and the maximum internal illuminance have an exponential relationship with the external illuminance, respectively. In addition to the above factors that affect the daylighting performance of the light pipe, Kocifaj [27] has shown that aerosols in the atmosphere are also one of the factors. Different types of aerosols will have different effects on illuminance patterns and efficiency.…”

Section: Light Pipes Combined With Artificial Lightingmentioning

confidence: 99%

Integrated Systems of Light Pipes in Buildings: A State-of-the-Art Review

Wu,

Jin,

Liu

et al. 2024

Buildings

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Artificial lighting comprises nearly one-third of the total electrical load of buildings, resulting in significant carbon emissions. Reducing the carbon emissions caused by artificial lighting is one of the ways to achieve low-carbon buildings. To meet the demand for high-efficiency, energy-saving, and comfortable lighting, light pipes are increasingly used in buildings. This paper reviews the research and development of light pipes and integrated technology. Sky conditions as a dynamic factor always affect the performance of light pipes. The combination of light pipes and an artificial lighting system can effectively solve this problem. A light pipe can be integrated with a ventilation stack to achieve the ventilation and cooling or heating of a building. A lighting-heating coupled light guide can improve the energy efficiency and sustainability in buildings, such as where antimony tin oxide nanofluid is introduced to absorb additional heat and then provide domestic hot water. The application of a photocatalyst to light pipes can realize air purification and self-cleaning. The use of light pipes does not consume electricity and can reduce the time spent using artificial lighting, thus allowing for power savings. From a whole life cycle perspective, the use of light pipes can be a balance of cost and benefit. In conclusion, such information could be useful for engineers, researchers, and designers to assess the suitability of applying integrated light pipes in different building types and examine the potential of energy and cost savings.

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Section: Light Pipes Combined With Artificial Lightingmentioning

confidence: 99%

Integrated Systems of Light Pipes in Buildings: A State-of-the-Art Review

Wu,

Jin,

Liu

et al. 2024

Buildings

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“…The performance of such a passive system depends mainly on the transmission properties of the light-guide body, but also on the instantaneous meteorological conditions [9][10][11][12]. The optical parameters of straight pipes have been intensively studied by many authors [13][14][15][16][17], while some have demonstrated that clear skies more than overcast ones produce complex illuminance patterns in the interior spaces.…”

Section: Introductionmentioning

confidence: 99%

An Accurate Prediction of Daylight Pipe Harvesting of Interior Space

Kómar

Kocifaj

2019

Applied Sciences

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Featured Application: The results of this research are useful in correct assessment of daylighting quality in the interiors respecting the typical instability of sky states. The computations we have performed allow for designing the optimum energy-saving solutions for light-pipe systems. Abstract:The performance of a light guide under arbitrary meteorological conditions is difficult to predict numerically because none of the present methods can account for the random configuration of clouds. Although, partly cloudy skies typically occur very frequently in many regions over the globe, the effects of cloud sizes, distributions, or altitudes on the luminous effectiveness of a light guide remain virtually unknown. The physical installation of light guides does not allow for a controlled experiment in which a single parameter can be varied within a defined range, while holding all other parameters constant. Numerical modeling is the only practical way to provide deep insights on the role of a specific property, such as cloud coverage, and its importance relative to all others (e.g., atmospheric turbidity). We have developed a unique solution through linking the UniSky simulator and HOLIGILM (hollow light guide interior illumination method) tool, while providing for the first time a powerful method that can provide accurate predictions and understanding of the fundamental differences of light guide behaviors under homogeneous and inhomogeneous sky states. The use of homogeneous skies in low-accuracy empirical models often results in overestimated/underestimated effectiveness of some light-guide systems. The model we have developed can predict complex optical signatures that are normally impossible to reproduce using up-to date empirical models (e.g., the illuminance patterns due to isolated clouds or clouds traversing across the sky). The optical efficiency, average cosine and working-place illuminance are analyzed and compared in order to demonstrate the model capabilities.

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Modeling the aerosol effects on the light field below a tubular-pipe: A case of clear sky conditions

Cited by 2 publications

References 42 publications

Integrated Systems of Light Pipes in Buildings: A State-of-the-Art Review

Integrated Systems of Light Pipes in Buildings: A State-of-the-Art Review

An Accurate Prediction of Daylight Pipe Harvesting of Interior Space

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