Parameter design of solar optical reflection lighting system array for shadowless lighting in threshold zone of short freeway tunnel

Shi, Lingna; Tu, Yun; Liu, Zhenyi; Wu, Jinsuo; Yu, Shanchuan

doi:10.1016/j.tust.2023.105207

Cited by 1 publication

(1 citation statement)

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“…The outcome demonstrated that the illumination efficiency for a single SOR lighting system is reasonably high, nearly maintaining the level of 70% theoretically. Based on an array of several SOR lighting systems that cause reflected sunlight to emanate to the threshold zone from varied angles, Shi et al [ 32 ] devised a quick and easy parameter design method for shadowless lighting. The use of shadowless lighting on a two‐lane expressway in the Shaanxi Province of China attests to its efficacy.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%