Innovative daylighting systems’ challenges: A critical study

Mayhoub, M.S.

doi:10.1016/j.enbuild.2014.04.019

Cited by 97 publications

(101 citation statements)

References 23 publications

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“…Since this system uses direct sunlight, its efficiency is affected by different conditions. In cloudy weather conditions this system is less effective than concentrating systems and in sunny weather it supplies at least 350lux to interior spaces (Mayhoub, 2014).…”

Section: ) Concentrating Collectorsmentioning

confidence: 99%

“… Daylight distribution over time: It is a criterion that indicates system effectiveness at different solar angles. The system that emits a more uniform light with lower fluctuations from the sunrise to the sunset is considered to have acceptable performance (Mayhoub, 2014). One of the criteria for assessment of light in the space is "Daylight Autonomy" which assesses hourly light distribution based on a specified intensity over a year (Reinhart and Weissman, 2012).…”

Section: Lighting Performancementioning

confidence: 99%

“…Ease of maintenance: It is significantly related to the technological complexity (Mayhoub, 2014).  Technical maturity: It is a technical assessment criterion, which reflects development of the system on the regional and global levels.…”

Section: Lighting Performancementioning

confidence: 99%

“… Maintaining daylight colour: The wavelength of light changes in the transmission process and different colours of sunlight are diffused in the interior space depending on the technology in use. IR resistance: It reflects control over infrared ray and thermal load received from sunlight (Mayhoub, 2014).  Ultraviolet ray resistance: It is prioritized depending on technologies used in systems and the possibility of attaching screening layers (Courret, et al, 1996) 5.2 Utilization 1) Economic Dimension:  Initial cost or investment cost includes all of the costs of constructing and transporting the product (Gašparini, et al, 2014).…”

Section: Lighting Performancementioning

confidence: 99%

“… Reliability: It reflects a system's ability to access the goals of design (Billinton and Karki, 2003).  Technological challenges: Technologies are classified into the simple and complicate categories depending on the active/passive type of system and the level of light concentration (Mayhoub, 2014).  Availability: Availability of manufacturing technologies and possibility of manufacture of parts sets the scene for the development of a system and its technical maturity (Naves, 2006).…”

Section: Lighting Performancementioning

confidence: 99%

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Integration Issues for Using Innovative Daylighting Strategies in Light Wells

Gashniani

Saradj

Faizi

2017

Journal of Applied Engineering Sciences

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ABSTRACT:"Light well" as one of the most common means of daylight tolls in building, experiences severe limitations and deserve special attention. The question is which strategy is the best for increasing the daylight penetration to the depth of buildings. One of the main challenges in deep plan is to guide daylight into the building core and this can be performed through daylighting strategies, but the choice of the proper innovative daylighting system (IDS) with several parameters is the problem. This paper aims to find elements for optimal choice and selecting context-compatible tools for light well. The result shows that four macro factors were found at the interaction of building and IDS. Identifying the integration components can play an effective role in decision-making or design a new tolls consistent with the physical conditions of light well and building to overcome the daylight crisis. * Corresponding author. Fatemeh Mehdizadeh SARADJ, mehdizadeh@iust.ac.ir

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Section: ) Concentrating Collectorsmentioning

confidence: 99%

Section: Lighting Performancementioning

confidence: 99%

Section: Lighting Performancementioning

confidence: 99%

Section: Lighting Performancementioning

confidence: 99%

Section: Lighting Performancementioning

confidence: 99%

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Integration Issues for Using Innovative Daylighting Strategies in Light Wells

Gashniani

Saradj

Faizi

2017

Journal of Applied Engineering Sciences

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Experimental Performance Evaluation of a Hybrid Parabolic Solar Lighting System for Use in Agricultural Environments

Karimi Yayshahri,

Gorjian,

Minaei

2023

Energy Tech

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Energy consumption for lighting is an important issue in agriculture due to the increasing trend of using artificial lighting systems in various growth environments, including greenhouses, indoor farming systems, vertical farming systems, and plant research facilities. In 2019, agricultural lighting accounted for an estimated annual electricity consumption of 13.3 TWh, accounting for about 2% of total energy consumption for general lighting. As a result, the industry is actively working to reduce its energy footprint and promote a more sustainable approach to agricultural lighting. This study presents a solar lighting system designed for indoor farming to provide natural light. The proposed system uses a parabolic dish concentrator (PDC) integrating with polymethyl methacrylate (PMMA) optical fibers to direct concentrated light into a desired place. In this design, two DC motors were installed to point the parabolic dish toward the sun during the day. Water cooling mechanism was also used to prevent heat transmission to the optical fibers. In addition, a photovoltaic (PV) module was integrated into this system to provide the required power of the system, which can follow the path of the sun due to its integration with the sun tracker,, increasing the amount of generated electricity. The indoor sunlight’s distribution was studied using a designed darkroom. The evaluation was carried out in seven days in November 23 to 29, from 8 a.m. to 4 p.m., to ensure the stability of the system under various weather conditions. The results of the experiments showed that the receiver’s temperature can be remained at 63 °C on sunny days under a clear sky, even when the maximum value of solar radiation was about 982 W/m2 with the highest air temperature of 19 °C. During the experiments, the solar illuminance ranged from a maximum of 118,821.85 lx to a minimum value of 374.9.6 lx. In addition, the results of the optical performance evaluation showed that the system can keep the illuminance level above 2,500 lx for an extended period which makes the system appropriate for a growth environment. It was also proved that the most important impacting factors on the performance of the system are solar radiation and incoming illuminance. The overall optical efficiency of the system, considering optical components, ranged from 31‐32% under various outdoor illuminance levels. Overall, it was confirmed that the developed solar lighting system offers a applicable method to naturally illuminate protected agricultural environments, enhancing the quality of the growing crops.This article is protected by copyright. All rights reserved.

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