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Application of borrowed light

Steve Khouw

Principal

DNA GreenDesign

LEEDuser Basic Member

126 thumbs up

December 31, 2010

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TODD REED

Energy Program Specialist

PA DMVA

LEEDuser Expert

626 thumbs up

Tue, 01/04/2011 - 13:25

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 Manager

Velux - Commercial Division

LEEDuser Basic Member

12 thumbs up

Mon, 02/21/2011 - 16:21

Borrowed light came up for me as well. Is there a free software that can support modeling borrowed light?

Jill Perry, PE

Consultant

Jill Perry, LLC

LEEDuser Expert

298 thumbs up

Mon, 02/21/2011 - 17:22

Radiance is free and will calculate borrowed light in accordance with LEED requirements. However, there is a large learning curve.

TODD REED

Energy Program Specialist

PA DMVA

LEEDuser Expert

626 thumbs up

Mon, 02/21/2011 - 18:49

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

Consultant

Jill Perry, LLC

LEEDuser Expert

298 thumbs up

Mon, 02/21/2011 - 20:57

Radiance can be used on its own with a Unix machine.

TODD REED

Energy Program Specialist

PA DMVA

LEEDuser Expert

626 thumbs up

Mon, 02/21/2011 - 21:08

Jill, I stand corrected, you are right about that it can be used as a stand alone program.

Jill Perry, PE

Consultant

Jill Perry, LLC

LEEDuser Expert

298 thumbs up

Fri, 01/27/2012 - 15:54

There is also Desktop Radiance for Windows machines, but all versions do have something of a learning curve.