Evaluating the visual and non-visual performance of shading systems through a novel simulation workflow
(2022) CIBSE Technical Symposium, London, April 2022 — Location: London (20.April.2022)
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- Abstract
- If properly designed and operated, shading systems such as venetian blinds can be effective to control solar ingress and contribute to reduce the occurrence of discomfort due to glare. By redirecting daylight into deeper areas, these systems also improve light distribution inside spaces. In addition to the energy and visual comfort aspects of lighting and shading systems, substantial interest has recently focused on the non-visual or non-image-forming (NIF) effects of daylight. NIF effects are associated with the entrainment of the circadian rhythm, and can play a major role in the health, well-being and task performance of occupants by helping to regulate their biological clock. The change in colour and intensity of daylight through a 24-hour period helps in synchronizing this rhythm, this process being regulated by the blue-light-sensitive intrinsically photosensitive retinal ganglion cells (ipRGCs) present in the human eye. ipRGCs convert electromagnetic luminous stimuli into neurochemical signals by the expression of melanopsin. The regulation of circadian rhythm depends, among other aspects, on the spectral dosage of different wavelengths through the daily light cycle. For evaluating the NIF performance of lighting and shading systems, their spectral properties (e.g., colour, spectral reflectivity) are important. NIF effects are currently evaluated using metrics such as the Melanopic equivalent daylight illuminance (m-EDI), M/P ratio, or Circadian Stimulus. In this study, we use a newly developed spectral simulation tool for estimating a series of NIF metrics inside a space and for assessing the performance of glazing and shading systems to support the occupants' visual and non-visual requirements.
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Citations
Maskarenj, M., Deroisy, B., & Altomonte, S. (2022). Evaluating the visual and non-visual performance of shading systems through a novel simulation workflow. CIBSE. Published. CIBSE Technical Symposium, London, April 2022, London. https://hdl.handle.net/2078.5/104065 (Original work published 2022)