Designing of light-pipe diffuser through its computed optical properties: A novel solution technique and some consequences

Kocifaj, Miroslav; Petržala, Jaromír

doi:10.1016/j.solener.2019.08.046

Cited by 6 publications

(5 citation statements)

References 38 publications

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“…When rough re-used aluminum cooking foil is used as the interior lining of the collimator, uniform spatial light distribution can also be obtained. Kocifaj and Petržala [52] proposed a new method of designing the diffuser. Under the premise of reducing light loss, the diffuser is designed according to the illuminance distribution required.…”

Section: Light Pipes Combined With Ato Nanofluids and Photocatalysismentioning

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 Ato Nanofluids and Photocatalysismentioning

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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“…Light transported through internal reflections via the guidance mechanism is deliberately or accidentally spread in both directions, depending on the optical properties of the output unit. Ideally, increasing the flux density if the luminous energy that escapes the base of the light tube results in the best possible indoor illumination [68]. The problem and the only practical way to gain deep insight into complex shifts of the cloud is by computational simulation [67].…”

Section: Daylight Predictionmentioning

confidence: 99%

“…These three models use online interior Light transported through internal reflections via the guidance mechanism is deliberately or accidentally spread in both directions, depending on the optical properties of the output unit. Ideally, increasing the flux density if the luminous energy that escapes the base of the light tube results in the best possible indoor illumination [68].…”

Section: Daylight Predictionmentioning

confidence: 99%

A Review on Effective Use of Daylight Harvesting Using Intelligent Lighting Control Systems for Sustainable Office Buildings in India

et al. 2021

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Lighting is a fundamental requirement of our daily life. A lot of research and development is carried out in the field of daylight harvesting, which is the need of the hour. One of the most desirable attributes of daylight harvesting is that daylight is available universally and it is a very clean and cost-efficient form of energy. By using the various methods of daylight harvesting, it is possible to attain the global Sustainable Development Goals. Daylight harvesting in the most fundamental sense is the lighting strategy control of the artificial light in an interior space where daylight is also present so that the required illumination level is achieved. This way, a lot of energy can be saved. Recently, in addition to energy efficiency, other factors such as cost-efficiency, user requirements such as uniform illuminance, and different levels of illuminance at different points are being considered. To simulate the actual daylight contribution for an office building in urban Chennai, India before construction, ECO TECH software is used by providing the inputs such as building orientation, and reflectance’s values of the ceiling, wall, and floor to analyze the overall percentage of daylight penetration available versus the percentage prescribed in the Indian Green Building Council to obtain the credit points. Thus, the impact of architectural design on daylight harvesting and daylight predictive technology has experimented with office building in Chennai, India. This article will give an insight into the current trends in daylight harvesting technology and intends to provide a deeper understanding and spark a research interest in this widely potential field.

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“…Studies have shown that horizontal light pipe (LP) has the potential to transport daylight and illuminate the deep interior of such rooms [15][16][17][18]. Although vertical LP provides an alternative to distribute the daylight, it is not feasible to be applied in a high-rise building as it sacrifices valuable space for daylight transport from the rooftop to the floors below compared to horizontal LP which can be retrofitted at plenum spaces [14,19,20,21]. However, although the deep interior can be illuminated up to 100-300 lx, there is still a high daylight penetration at the front portion of the room that receives more than 500 lx, and this causes visual discomfort [1].…”

Section: Introductionmentioning

confidence: 99%

Daylighting Performance of Integrated Venetian Blinds with Horizontal Light Pipe System for Deep Plan High-Rise Office in Tropical Climate

Heng

Razif

Fadzil

et al. 2022

ARASET

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A substantial amount of daylight is received by tropical countries like Malaysia. There are advantages and disadvantages to using this renewable resource in a high-rise office building. Such buildings' deep plan spaces make it difficult to create a uniform daylight distribution across the space. A solution for this issue is the usage of an integrated Venetian blind (VB) with a horizontal light pipe (LP). Using an overcast and intermediate sky in South orientation, seven (7) distinct types of VB angle configurations were simulated using the Integrated Environment Solution Virtual Environment (IESVE) to evaluate how well they performed in daylight with an integrated LP. The findings demonstrated that the daylight uniformity throughout the room was improved by the integration of the VB and LP systems. When compared to a room with only a LP installed, VB with 0o and -15o angles had the best performance. The combination of LP and VB allowed for the shading of the front portion of the space and at the same time, illuminating the rear portion of the space. The results of this study encourage building designers to utilise the integrated VB and LP in the deep open-plan high-rise office building and reduce the use of non-renewable energy resources.

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Designing of light-pipe diffuser through its computed optical properties: A novel solution technique and some consequences

Cited by 6 publications

References 38 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

A Review on Effective Use of Daylight Harvesting Using Intelligent Lighting Control Systems for Sustainable Office Buildings in India

Daylighting Performance of Integrated Venetian Blinds with Horizontal Light Pipe System for Deep Plan High-Rise Office in Tropical Climate

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