Does anybody know how to calculate borrowed light streaming into private cell offices formed by glazed partitions but programmed deep near the core within an open space?
In pursuit of this credit we are using Option 2, prescriptive method. But it appears the calculation approach only applies for simple open square shaped spaces, but the prescription appears no provision for estimating borrowed light.
If not possible, I take it we just have to go with combination paths, i.e. calculate daylighting for open workspace supplemented with actual measurement in the private cells, right?
Happy New Year to all. For us Chinese it will be the Year of the Rabbit!
TODD REED
Energy Program SpecialistPA DMVA
LEEDuser Expert
888 thumbs up
January 4, 2011 - 8:25 am
The prescriptive path cannot be used to calculate borrowed light conditions such as yours. You will need to use a combination of methods.
Candice Clark
Business Development ManagerVelux - Commercial Division
17 thumbs up
February 21, 2011 - 11:21 am
Borrowed light came up for me as well. Is there a free software that can support modeling borrowed light?
Jill Perry, PE
ConsultantJill Perry, LLC
LEEDuser Expert
440 thumbs up
February 21, 2011 - 12:22 pm
Radiance is free and will calculate borrowed light in accordance with LEED requirements. However, there is a large learning curve.
TODD REED
Energy Program SpecialistPA DMVA
LEEDuser Expert
888 thumbs up
February 21, 2011 - 1:49 pm
Radiance will need to be used in conjunction with another program. Daysim is also a free program, it has a large learning curve unless used in conjunction with other programs. You can use Google Sketchup which has a plug in for Daysim. Both are free, sketchup is easy to use and the plug in can be a little hard to get it to work right. SPOT ( Sensor Placement Optimization Tool) is also free but i believe it cannot do borrowed light scenarios.
Jill Perry, PE
ConsultantJill Perry, LLC
LEEDuser Expert
440 thumbs up
February 21, 2011 - 3:57 pm
Radiance can be used on its own with a Unix machine.
TODD REED
Energy Program SpecialistPA DMVA
LEEDuser Expert
888 thumbs up
February 21, 2011 - 4:08 pm
Jill,
I stand corrected, you are right about that it can be used as a stand alone program.
Jill Perry, PE
ConsultantJill Perry, LLC
LEEDuser Expert
440 thumbs up
January 27, 2012 - 10:54 am
There is also Desktop Radiance for Windows machines, but all versions do have something of a learning curve.