Evaluation of Daylight Availability for Energy Savings

Bellia, Laura; Fragliasso, Francesca; Pedace, Alessia

doi:10.15627/jd.2015.2

Cited by 21 publications

(20 citation statements)

References 20 publications

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“…To attain the required illuminance of 500 lx, which is the minimum requirement [38][39][40][41], in the office when sunlight fell from the required range, we made use of LED light sources. LEDs were placed by feedback from a light sensor.…”

Section: Simulation and Resultsmentioning

confidence: 99%

Development of Optical Fiber-Based Daylighting System and Its Comparison

Ullah

Whang

2015

Energies

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Fiber-optic daylighting systems have been shown to be a promising and effective way to transmit sunlight in the interior space whilst reducing electric lighting energy consumption. To increase efficiency in terms of providing uniform illumination in the interior, the current need is to illuminate optical fiber-bundle with uniform light flux. To this end, we propose a method for achieving collimated light, which illuminates the fiber-bundle uniformly. Light is collected through a parabolic concentrator and focused toward a collimating lens, which distributes the light over each optical fiber. An optics diffusing structure is utilized at the end side of the fiber bundle to spread light in the interior. The results clearly reveal that the efficiency in terms of uniform illumination, which also reduces the heat problem for optical fibers, is improved. Furthermore, a comparison study is conducted between current and previous approaches. As a result, the proposed daylighting system turns out convenient in terms of energy saving and reduction in greenhouse gas emissions.

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Section: Simulation and Resultsmentioning

confidence: 99%

Development of Optical Fiber-Based Daylighting System and Its Comparison

Ullah

Whang

2015

Energies

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“…Ref. [70,71] present the application of artificial intelligence to predict the availability of daylighting and use this algorithm to calculate the final energy requirements of a building. The calculation of daylight availability and its impact on energy savings are presented in Reference [72][73][74].…”

Section: Literature Reviewmentioning

confidence: 99%

Feasibility Study and Impact of Daylight on Illumination Control for Energy-Saving Lighting Systems

Bunjongjit

Ngaopitakkul

2018

Sustainability

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The main goal of energy conservation should be reducing the consumption of energy resources. Due to energy and environmental concerns in recent years, to reduce energy consumption in a lighting system, which has been one of the prime targets of energy saving, daylighting has been investigated and has become one of the energy-efficiency techniques widely applied in buildings. This paper presents an analysis of T5 fluorescent luminaire lighting control using daylight in a building. The study is conducted in two parts; simulation of a lecture room using the daylighting function of the DIALux program is performed to estimate the effect of daylighting on a task area (workplane). Another part is an experimental setup to evaluate the performance of a lighting control unit that is installed for a T5 fluorescent luminaire with a dimmable electronic ballast. The efficiency of the lighting control in term of illumination on the task area and energy consumption are also evaluated and compared with the standard case. The simulation results show that daylighting increases illuminance on a task area, especially on the window side, so the lighting system can significantly reduce its power consumption compared with a standard case (without lighting control). The experimental result shows that upon installing the lighting control with daylighting, both the average illuminance and the energy consumption in each time period are decreased compared with in the standard case. Lighting control with daylighting tries to set the average illuminance on a task area to less than 500 lux, corresponding to the amount of daylight passing through window shutters. The obtained results are useful for the design of a T5 fluorescent luminaire with lighting control using daylighting in a building lighting system for energy efficiency and reducing energy consumption, including the average illuminance on the task area, according to a relevant standard.

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“…An illuminance level of 100 lux, the DA in April onwards (Fig. 9), could be used for spatial orientation in corridors and toilets, with full daylight illuminance at higher solar angles during six months of the year according to [28] and along with complementary lighting for the rest of the year [29]. In all, this would still provide about 33% and 37% of DA for house 1 and house 2, respectively, which was calculated at 0.7 m above floor level, compared with the DA at sensor level.…”

Section: Daylight Autonomy and Illuminationmentioning

confidence: 99%

“…With the annual DA results obtained here, the amount of electricity used for lighting purposes in farm buildings for growing pigs, broilers, and laying hens could be reduced. Combining light pipes with dimmable LED lights in periods of weak DA could reduce the electricity use for lighting to an even lower level [29].…”

Section: Design Considerationsmentioning

confidence: 99%