Evaluation of a Deep Plan Office Space Daylit with an Optical Light Pipe and a Specular Light Shelf

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Title: Evaluation of a Deep Plan Office Space Daylit with an Optical Light Pipe and a Specular Light Shelf
Author: Upadhyaya, Kapil
Abstract: This research developed the Optical Light Pipe (OLP ) as a feasible solution to solve the problem of insufficient daylighting in deep plan office spaces for predominantly sunny climates . It further combined the OLP with a Specular Light Shelf (SLS ) to achieve uniform daylighting . This research was performed with an experimental setup of two 1 :4 scale models of deep plan office spaces , modified from an earlier research on optical light pipe at College Station , TX . Blinds and shading devices were installed on the south fa ?ade to provide daylight to the front zone of a 20 feet by 30 feet office module . The back zone was daylit by the OLP hidden in the plenum . The existing OLP design was optimized through computer aided ray -tracing . The SLS design was based on an earlier prototype designed at Lawrence Berkeley National Labs (LBNL ) . Results were based on observations made on clear and cloudy sky days between February 3rd and March 17th . The OLP achieved more than 300 lux of average workplane illuminance for 7 .4 hours , when global horizontal illuminance was greater than 40 ,000 lux . It also achieved 200 lux of illuminance higher than an earlier prototype (Martins -Mogo , 2005 ) on workplane between 1000hrs and 1630hrs . It exhibited a glare free daylight distribution with luminance ratios well within prescribed limits on most of the vertical surfaces , with a relatively uniform illuminance distribution on back taskplane . OLP was better than windows with blinds and shading at providing diffuse daylight in backzone on a cloudy day , when global horizontal illuminance was greater than 20 ,000 lux . The OLP used in combination with SLS achieved more than 500 lux of average workplane illuminance for 6 hours , when global horizontal illuminance was greater than 40 ,000 lux . SLS also produced more uniform illuminance levels on the workplane at all times and on the leftwall at most times . However , it produced non -uniform luminance distribution on walls and ceiling and luminance ratios higher than allowable limits on the sidewall for some morning hours , and hence needed further refinement in design .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2873
Date: 2009-05-15

Citation

Evaluation of a Deep Plan Office Space Daylit with an Optical Light Pipe and a Specular Light Shelf. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2873 .

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