Evaluation of a large dish-type concentrator solar lighting system for underground car park

Song, Duofu; Lv, Hui; Liao, Jun; Huang, Wenjuan; Huang, Sihao; Zhang, Huiliang; Su, Yuehong; Riffat, Saffa

doi:10.1002/er.4017

Cited by 7 publications

(4 citation statements)

References 40 publications

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“…According to the efficiency of the optical components used in the system and considering their overall optical efficiency, the power and overall efficiency of the system should be more than 35%. [19,34,35,37,41] The total optical efficiency is the ratio of the light output of the system in the darkroom to the amount of light received by the system which is proportional to the surface area of the concentrator. From the experimental results, the efficiency of the system ranged from 31% to 32% under different outdoor illuminance levels (see Figure 15).…”

Section: Resultsmentioning

confidence: 99%

“…For a distance of 10 m, the approximate loss or light transmission efficiency in a plastic optical fiber (POF) or PMMA is about 0.63. [ 19,37 ] For some special building lighting where the fiber must be bent indoors, it is necessary to use the following equation to calculate the bending loss of the optical fiber [ 14 ] :

$$\alpha = \frac{4.34 w^{2}}{\beta a^{2} \left(\right. 1 + w \left.\right)} \times \left(\left(\right.

…”

Section: System Design and Descriptionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

$$\alpha = \frac{4.34 w^{2}}{\beta a^{2} \left(\right. 1 + w \left.\right)} \times \left(\left(\right.

…”

Section: System Design and Descriptionmentioning

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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“…At present, UPS renewal is mainly achieved through the adjustment of equipment and spatial configuration to improve the physical performance of the environment, such as improving thermal comfort [25], light environment [26], ventilation [27], fire protection [28], and energy consumption [29]. These cases were not concerned with the change in function as parking.…”

Section: The Possibilities and Benefits Of Underground Space Renewalmentioning

confidence: 99%

Sustainable Renewal of Underground Parking Space in the Scenario of Shared Autonomous Vehicles

et al. 2021

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Shared autonomous vehicles (SAVs) are a major development direction in international scientific and technological innovation. One of the most popular features of SAVs in the urban space is that they can significantly reduce the need for parking. The urban underground parking space (UPS) is currently the largest static traffic space, especially in high-density urban centers. Under the SAV scenario, the need for the renewal of UPS will increase in the near future. However, renewal of the UPS is difficult due to its special form features, which are greatly restricted by the external environment, thus necessitating targeted methods and strategies. This research first conducted field investigations and data collection on the spatial morphology and service conditions of typical UPSs in different areas of Hangzhou city. Based on the driver status response and the multi-objective attribute models, the time-series evaluation method and function replacement decision model for the sustainable renewal of underground parking were established. The research also discusses appropriate design strategies for the combination of spatial characteristics and functional replacement goals of typical samples. The conclusions will provide scientific guidance for the future design practice of architects and urban designers in SAV.

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“…After concentration or compression, the sunlight is transmitted through the optical fiber, light pipe or free space [105]. The technology transmitted through the optical fiber is also called Fiber Daylighting System [32,[38][39][40][41][42][43][44][47][48][49][50]52,[101][102][103][104][106][107][108]. However, the main materials of the optical fiber used in the fiber daylighting system are: SiO 2 , PMMA and quartz.…”

mentioning

confidence: 99%

A Review of Daylighting System: For Prototype Systems Performance and Development

et al. 2019

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Daylighting systems make daylight illuminance possible, and the development of prototype daylighting systems can provide more efficient daylight illuminance. The purpose of this article is to review the development and performance of prototype daylighting systems in the last decade. The passive and active daylighting systems are listed separately and divided into the four categories by the presence and absence of hybrid. Each prototype daylighting system was evaluated in terms of cost and daylight performance and as well as their novel optical design. We evaluated the architecture and daylighting principles of each system by reviewing individual prototype daylighting systems. The cost of prototype systems still poses a challenge to development. How to use passive or active systems in different environments and whether or not electrical lighting assistance is needed is a controversial issue. However, active daylighting systems equipped with solar tracking systems are still mainstream. This research is a valuable resource for daylight researchers and newcomers. It is helpful to understand the advantages of various prototype daylighting systems and commercial daylighting systems that have been developed for many years; moreover, it is also possible to know the research directions suggested by the prototype daylighting systems. These will be of further use in developing innovative and better daylighting systems and designs.

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Evaluation of a large dish-type concentrator solar lighting system for underground car park

Cited by 7 publications

References 40 publications

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

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

Sustainable Renewal of Underground Parking Space in the Scenario of Shared Autonomous Vehicles

A Review of Daylighting System: For Prototype Systems Performance and Development

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