C. Regnier - Academia.edu (original) (raw)
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Graduate Center of the City University of New York
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Papers by C. Regnier
Energy and Buildings, 2018
IOP Conference Series: Earth and Environmental Science, 2019
This study demonstrates an experimental example of application of time-lapse high dynamic range i... more This study demonstrates an experimental example of application of time-lapse high dynamic range images for analyzing variations in correlated color temperature (CCT) and circadian lighting in an interior space daylit using a tubular daylight device (TDD). Previous studies have shown that the spectral composition of daylight affects human circadian rhythms, with emphasis on wavelengths towards the blue region of the visible spectrum. Spectrally based metrics such as CCT can therefore aid in evaluating the circadian impact of daylight. TDDs redirect daylight towards interior spaces with changing light levels and color temperatures during the daylight hours. This paper details the color temperature and circadian lighting metrics (circadian luminance and illuminance) in an interior space throughout a period of several days in a mid-latitude, temperate, sunny climate. An automated time-lapse HDR photography apparatus was modified to allow for calculation of CCT and circadian lighting metrics using state-of-the art techniques available in the literature. Prior to the measurements in the space with the TDD, this device was calibrated against a spectrophotometer. Results indicate the level of daily variation in CCT and circadian lighting metrics that can be expected in interior spaces daylit by TDDs without any other sources of daylight. Besides showcasing the use of HDR techniques, these results could be used to support design decisions involving daylighting in interior spaces. These techniques can also be used outside the laboratory in the evaluation of the circadian impact of lighting throughout the built environment. 1.Introduction Studies have shown the effect of correlated color temperature of space lighting on occupant's health, well-being and productivity [1]. There are very few studies that analyzed the variability of circadian
Center (OSC) project team member leading research efforts.
(DOE) and the Hawai`i Clean Energy Initiative to develop and implement solutions to retrofit exit... more (DOE) and the Hawai`i Clean Energy Initiative to develop and implement solutions to retrofit exiting buildings to reduce energy consumption by at least 30% as part of DOE's Commercial Building Partnerships (CBP) Program 1. Kuykendall Hall, located on the UHM campus in Honolulu, was the focus of a CBP analysis and design collaboration among the University of Hawai'i, their consultants, and Lawrence Berkeley National Laboratory (LBNL). Kuykendall Hall consists of two 1960s-era wings-a four-story wing containing classrooms, and a seven-story tower containing offices-with a total floor area of approximately 76,000 square feet (ft 2).
ABSTRACT Science at the Theater: Berkeley Lab scientists reveal the latest research on how to red... more ABSTRACT Science at the Theater: Berkeley Lab scientists reveal the latest research on how to reduce your carbon footprint at home, work, and when you shop. Learn how even small choices can have a big impact. Iain Walker's research focuses on optimizing the energy use and comfort of buildings. He's a staff scientist in the Energy Performance of Buildings Group, which is part of Berkeley Lab's Environmen...tal Energy Technologies Division. He's also executive editor of Home Energy Magazine. Cindy Regnier is a Project Manager in the Environmental Energy Technologies Division at Berkeley Lab. She has over 13 years of mechanical engineering design experience, with a focus on low-energy buildings. Her projects have included several LEED Platinum buildings and the design of a 200,000 sf carbon neutral, net-zero energy science museum in San Francisco. Eric Masanet is Acting Deputy Leader of the International Energy Studies Group at Berkeley Lab. His research focuses on life-cycle assessments and energy efficiency analysis. He holds a joint research appointment in the Institute of Transportation Studies at UC Berkeley.
Energy and Buildings, 2018
IOP Conference Series: Earth and Environmental Science, 2019
This study demonstrates an experimental example of application of time-lapse high dynamic range i... more This study demonstrates an experimental example of application of time-lapse high dynamic range images for analyzing variations in correlated color temperature (CCT) and circadian lighting in an interior space daylit using a tubular daylight device (TDD). Previous studies have shown that the spectral composition of daylight affects human circadian rhythms, with emphasis on wavelengths towards the blue region of the visible spectrum. Spectrally based metrics such as CCT can therefore aid in evaluating the circadian impact of daylight. TDDs redirect daylight towards interior spaces with changing light levels and color temperatures during the daylight hours. This paper details the color temperature and circadian lighting metrics (circadian luminance and illuminance) in an interior space throughout a period of several days in a mid-latitude, temperate, sunny climate. An automated time-lapse HDR photography apparatus was modified to allow for calculation of CCT and circadian lighting metrics using state-of-the art techniques available in the literature. Prior to the measurements in the space with the TDD, this device was calibrated against a spectrophotometer. Results indicate the level of daily variation in CCT and circadian lighting metrics that can be expected in interior spaces daylit by TDDs without any other sources of daylight. Besides showcasing the use of HDR techniques, these results could be used to support design decisions involving daylighting in interior spaces. These techniques can also be used outside the laboratory in the evaluation of the circadian impact of lighting throughout the built environment. 1.Introduction Studies have shown the effect of correlated color temperature of space lighting on occupant's health, well-being and productivity [1]. There are very few studies that analyzed the variability of circadian
Center (OSC) project team member leading research efforts.
(DOE) and the Hawai`i Clean Energy Initiative to develop and implement solutions to retrofit exit... more (DOE) and the Hawai`i Clean Energy Initiative to develop and implement solutions to retrofit exiting buildings to reduce energy consumption by at least 30% as part of DOE's Commercial Building Partnerships (CBP) Program 1. Kuykendall Hall, located on the UHM campus in Honolulu, was the focus of a CBP analysis and design collaboration among the University of Hawai'i, their consultants, and Lawrence Berkeley National Laboratory (LBNL). Kuykendall Hall consists of two 1960s-era wings-a four-story wing containing classrooms, and a seven-story tower containing offices-with a total floor area of approximately 76,000 square feet (ft 2).
ABSTRACT Science at the Theater: Berkeley Lab scientists reveal the latest research on how to red... more ABSTRACT Science at the Theater: Berkeley Lab scientists reveal the latest research on how to reduce your carbon footprint at home, work, and when you shop. Learn how even small choices can have a big impact. Iain Walker's research focuses on optimizing the energy use and comfort of buildings. He's a staff scientist in the Energy Performance of Buildings Group, which is part of Berkeley Lab's Environmen...tal Energy Technologies Division. He's also executive editor of Home Energy Magazine. Cindy Regnier is a Project Manager in the Environmental Energy Technologies Division at Berkeley Lab. She has over 13 years of mechanical engineering design experience, with a focus on low-energy buildings. Her projects have included several LEED Platinum buildings and the design of a 200,000 sf carbon neutral, net-zero energy science museum in San Francisco. Eric Masanet is Acting Deputy Leader of the International Energy Studies Group at Berkeley Lab. His research focuses on life-cycle assessments and energy efficiency analysis. He holds a joint research appointment in the Institute of Transportation Studies at UC Berkeley.