The costs and benefits of using daylight guidance to light office buildings

Mayhoub, M.S.; Carter, D.J.

doi:10.1016/j.buildenv.2010.09.014

Cited by 62 publications

(40 citation statements)

References 6 publications

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“…A study from Carnegie Mellon University (CMU) shows that costs of an employee 160 times that of energy. Conventional daylight from windows yielded energy savings of £7/m 2 and annual productivity gains of £142/m 2 [8]. The study also concludes that by factoring in all the mentioned intangible benefits, the usage of tubular daylight guidance systems in London has a payback period of 6 years.…”

Section: Payback Periodmentioning

confidence: 83%

“…However, as noted by Mayhoub & Carter [8], the conventional payback period does not capture intangible items such as building cooling savings, carbon tax savings, residual value, enhanced corporate prestige, and most importantly, the effect of daylight on human performance. A study from Carnegie Mellon University (CMU) shows that costs of an employee 160 times that of energy.…”

Section: Payback Periodmentioning

confidence: 99%

“…There are three factors affecting payback periods: electricity prices, system capital cost, and available external local illuminance [8]. In view of the increasing commercial electricity tariffs in Malaysia and other advantages as mentioned, the payback period for the DT is likely much lower.…”

Section: Payback Periodmentioning

confidence: 99%

“…Over the last fifty years, the development of a number of reflective and refractive materials has made redirection of daylight much deep into a building possible. Mayhoub & Carter [8] categorize two main approaches for daylighting strategies; 'beam daylighting' -adding reflective elements to conventional façade, and 'light guidance' -capturing daylight using collector devices to transport it into deep areas of the building. Focusing on the latter approach, this paper intends to compare the daylight performance of a recently installed daylight trough in Malaysia.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Practicality and Performance of Daylight Trough in The Tropics: A Case Study

Gene-Harn

Reimann²,

Bhaskaran³

et al. 2016

MATEC Web Conf.

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Abstract. The field of office daylighting is vital for both energy efficiency practice and occupants' visual comfort. With the emergence of green building in Malaysia, building designers are exploring avenues for energy efficiency design; one common strategy is daylighting. The majority literature reviews on daylighting are skewed towards temperate or developed countries, where sky luminous condition is different from that of the Tropics. Conventional daylighting system designs redirect daylight from the envelope or atrium openings, such as light shelves. Presumed to be the pioneer daylight trough in the Tropics, this paper presents the simulated and in-situ lighting level measurements prior to occupancy. This case study presents an as-built daylight trough design which is able to daylight the office space as deep as 6 meters sufficiently. It achieves a lighting power density 1.90W/m 2 and saves 39.2% of lighting energy over conventional office lighting energy. Discussed further is the practicality of working with such a system, including cost implication, return on investment and contractual challenges in reaching a consensus on the design. The results reinforce that the effectiveness of daylighting design is very dependable on the sun path and obstacles surrounding the office tower. The RADIANCE simulation correlates well to field measurement results. Further investigation into the light trough, its lighting energy savings, users' interaction, visual comfort, and glare is still ongoing.

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Section: Payback Periodmentioning

confidence: 83%

Section: Payback Periodmentioning

confidence: 99%

Section: Payback Periodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Practicality and Performance of Daylight Trough in The Tropics: A Case Study

Gene-Harn

Reimann²,

Bhaskaran³

et al. 2016

MATEC Web Conf.

View full text Add to dashboard Cite

show abstract

“… Operation cost: It includes all of the fees, government energy incentives and costs of system operating (Pilavachi, et al, 2009).  Maintenance cost: It includes the costs of cleaning, overhauling, and replacing parts, which differs by system type (static-dynamic) (Mayhoub and Carter, 2011).  Payback period: The payback period is the period required for the return of initial investment.…”

Section: Lighting Performancementioning

confidence: 99%

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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An optimal design analysis of a novel parabolic trough lighting and thermal system

Yuan

2016

Int. J. Energy Res.

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SUMMARYIn order to reduce the cost and improve the efficiency of daylighting, an innovative parabolic trough solar lighting and thermal (PTL/T) system is designed and analyzed in this paper.Parabolic trough solar lighting and thermal system uses parabolic trough collector (PTC) controlled by two-axis solar tracking system as solar collector. The collected sunlight is split by a cold mirror into visible light and infrared. The visible light is reflected by cold mirror, re-concentrated by a second-stage Fresnel lens, and then delivered by plastic optical fiber to the buildings for daylighting. The infrared goes through cold mirror, reaches thermal system, and is used for heating generation.The basic structure of PTL/T was outlined and described. The dimension of fiber bundle and parabolic trough was chosen after an optimal analysis. The cost of illuminating unit area was expressed as a function of illumination space dimensions and critical components efficiency.A case study was conducted to get a specific optimized illumination area and PTC area for the first time. The optimized result is to use 8-m 2 PTC as collector to illuminate 500-m 2 office space. The total solar energy utilization efficiency is 39.4%, with the lighting efficiency of 16.3% and thermal efficiency of 23.1%. The maximum energy savings and simple payback period were calculated for 10 typical cities when applied in residential, commercial, and industrial sectors. The amounts of greenhouse gas-emission reductions were also calculated. The payback period in Sunbelt region is as low as less than 10 years like in Los Angeles. The results show the proposed PTL/T system is competitive compared with traditional solar energy systems.

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The costs and benefits of using daylight guidance to light office buildings

Cited by 62 publications

References 6 publications

Practicality and Performance of Daylight Trough in The Tropics: A Case Study

Practicality and Performance of Daylight Trough in The Tropics: A Case Study

Integration Issues for Using Innovative Daylighting Strategies in Light Wells

An optimal design analysis of a novel parabolic trough lighting and thermal system

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