August 2007
Letter to Editor

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ref to the Article on Daylight Harvesting   J R Anjaria
 Indian BMS Industry

Dear Ken,

[an error occurred while processing this directive] This is in ref to the Daylight harvesting appearing in Automated Buildings August issue released by Craig DiLouie, Principal, ZING Communications, Inc

The author has indicated almost 35-60% savings on account of Daylight harvesting.

In the September issue part II, I would like to request the author to analyse and compare these savings in context with the corresponding increase in Airconditionig load which may result on account of increased transmission gains (through glass etc) - which is a natural outcome of efforts made to increase outside lighting.

Thanks and Best Regards

J R Anjaria
Observer - Indian BMS Industry
Mumbai City, India

J R Anjaria

I belief you would be correct if no action was done to prevent increased transmission the below article provides some insight into how this can be designed to achieve both daylighting and reduced transmission

I have copied Craig so he may provide his own comments.

A computer simulation would be required of the actual building design to provide accurate information to solve this complex equation

Thanks for your observation

Ken Sinclair Editor/Owner

Hello M. Anjaria,

Thanks for your letter. Your question is entirely appropriate but deals with a discipline in which I claim little expertise, as it’s not specifically controls-related. What I do know is there are two factors an architect should be careful about when constructing a building with ample daylighting—glare and heat gain. There are technologies available that address each. For example, for glare, automated window shades that provide a view but reduce glare can be tied to the control system; Lutron makes a product like this. For heat gain, there are many strategies, including exterior shading devices both automated and fixed, high-quality glazing that enables light penetration but reduces solar penetration, and even trees and plants can be used to shade the building. The orientation of the building may be another factor. A good rule of thumb is to avoid direct sunlight penetration unless specifically desired in a space, and direct daylight into the building using shielding media from interior to exterior shading devices.

The Advanced Lighting Guidelines has some good information that may prove helpful in this area (see section 6.3, 7.4 and others relevant to daylighting):

I hope this helps you.

Best Regards,

Craig DiLouie

ZING Communications, Inc.
612 - 23rd Avenue SW
Calgary, AB T2S 0J7



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