On the energy efficiency of a prototype hybrid daylighting system

Tsangrassoulis, Aris; Doulos, Lambros T.; Santamouris, M.; Fontoynont, Marc; Maamari, Fawaz; Wilson, M.; Jacobs, Axel; Solomon, John T.; Zimmerman, A.; Pohl, W; Mihalakakou, G.

doi:10.1016/j.solener.2004.09.014

Cited by 91 publications

(54 citation statements)

References 2 publications

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“…The DF can be expressed by Equation (2). = , (2) k and ψ in Equation (2) can be calculated using Equation (3) and Equation(4).…”

Section: Evaluation Of the Case Studymentioning

confidence: 99%

“…This value is the average in the centre of the space under consideration. The DF can be expressed by Equation (2).…”

Section: Evaluation Of the Case Studymentioning

confidence: 99%

“…An active solar daylighting system behind the perimeter wall is described by Kontadakis, A. et al [1]. Furthermore, Tsangrassoulis, A. et al [2] deals with the prototype of the hybrid daylight system. Some other aspects play important roles for daylight, such as dimming in relation to daylight (Doulos, L. et al [3]).…”

Section: Introductionmentioning

confidence: 99%

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Daytime Lighting Assessment in Textile Factories Using Connected Windows in Slovakia: A Case Study

2018

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This paper highlights the problems that are associated with daylight use in industrial facilities. In a case study of a multi-story textile factory, we report how to evaluate daylight (as part of integral light) in the production halls marked F and G. This study follows the article in the Buildings journal, where Hall E was evaluated (unilateral daylight). These two additional halls have large areas that are 54 × 54 m and are more than five meters high. The daylight is only on the side through the attached windows in envelope structures in the vertical position on the hall. In this paper, we want to present two case studies of these two production halls in a textile factory in the eastern part of Slovakia. These are halls that are illuminated by daylight from two sides through exterior peripheral walls that are against or next to each other. The results of the case studies can be applied in similar production halls illuminated by a "double-sided" (bilateral) daylight system. This means that they are illuminated by natural illumination through windows on two sides in a vertical position. Such a situation is typical for multi-storied industrial buildings. The proposed approximate calculation method for the daylight factor can be used to predict the daylight in similar spaces in other similar buildings.

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“…The DF can be expressed by Equation (2). = , (2) k and ψ in Equation (2) can be calculated using Equation (3) and Equation(4).…”

Section: Evaluation Of the Case Studymentioning

confidence: 99%

“…This value is the average in the centre of the space under consideration. The DF can be expressed by Equation (2).…”

Section: Evaluation Of the Case Studymentioning

confidence: 99%

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Daytime Lighting Assessment in Textile Factories Using Connected Windows in Slovakia: A Case Study

2018

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“…The colour properties of the hybrid lighting system were evaluated with artificial light sources and estimated between 5000 and 5500 K [7,13,19,20]. Tsangrassoulis et al [21] developed a method to control the light output from a prototype hybrid lighting system. The control strategy is based on cloudiness prediction.…”

Section: Introductionmentioning

confidence: 99%

“…It is emphasized that switching modes of lamps could be arranged with the time evolution of the cloud cover. Here, lighting energy savings were determined as 55.4% for January and 58.8% for June sky conditions of Athens [21].…”

Section: Introductionmentioning

confidence: 99%

Transmission performance of fibre-optic bundle for solar lighting

Kandilli

Turkoglu

Ülgen

2009

Int. J. Energy Res.

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SUMMARYTransmission of concentrated solar energy via fibre-optic bundle (FOB) has a great potential for numerous applications. In this paper, it is aimed to determine the transmission performance of a constructed plastical FOB-based solar lighting system. The experiments and measurements are carried out by means of a metal halide source simulating the spectral distribution of solar radiation in visible range of wavelength. Optical efficiency, luminous efficacy, attenuation, spectral characterization under different bending conditions, integration of optical filters and FOB were investigated. The effects of the optical filter proposed are discussed for a solar lighting system. Spectral and colour properties of FOB and the optical filter are also presented.

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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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On the energy efficiency of a prototype hybrid daylighting system

Cited by 91 publications

References 2 publications

Daytime Lighting Assessment in Textile Factories Using Connected Windows in Slovakia: A Case Study

Daytime Lighting Assessment in Textile Factories Using Connected Windows in Slovakia: A Case Study

Transmission performance of fibre-optic bundle for solar lighting

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

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