[Bldg-sim] Energy Modelling - Lighting heat loads fractions

[Duggin, Cory via Bldg-sim]

Table 3 in chapter 18 of ASHRAE Fundamentals 2013 gives the space fraction and radiant fraction for several luminaire types.

Cory Duggin, PE, LEED AP BD+C, BEMP
Principal/Energy Modeling Wizard
TLC Engineering for Architecture
direct:

615-346-1939


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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Nassim Jamali via Bldg-sim
Sent: Thursday, August 25, 2016 10:05 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Energy Modelling - Lighting heat loads fractions

Hi,

I'm assessing the risk of overheating in a meeting room that have indirect T5 lamps installed.
I'm encoding that on DesignBuilder which determines the heat gains provided by lighting by specifying the convective and radiative part from the power density.

The visible part is 18%,  the radiant fraction is 42% and the convective part is 40% according to the software. I find that the figures put in DesignBuilder are a bit exagerated.
Therefore, I'm looking for a document that describes the fraction that goes into visible light, radiation and convection per type of lamps.

Can someone help me by sharing this information?

Thanks in advance,

Regards,



Nassim Jamali
Building Performance Consultant

t +32 (0)2 468 11 58
f +32 (0)2 468 11 78
noordkustlaan 10, 1702 groot-bijgaarden, belgium


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