|
|
| View previous topic :: View next topic |
| Author |
Message |
johntaylor
Posts: 52
|
 Posted: Wed Mar 19, 2008 8:00 pm Post subject: Lighting visible fraction |
 |
|
Your settings input lighting visible fraction as .18.
18% efficient lightning is well above anything used in buildings. fluorescents are 8-14% efficient and incandescentsare 2% efficient. |
|
| Back to top |
|
 |
Andy Tindale
Posts: 1198
Location: Stroud |
| Posted: Thu Mar 20, 2008 12:30 am Post subject: |
|
|
The default lighting data used in DesignBuilder comes from the "Lighting Handbook: Reference & Application, 8th Edition, Illuminating Engineering Society of North America, New York, 1993, p. 355." as recommended in the EnergyPlus manual.
Can you point me to a reference of more appropriate values? I will pass this on the E+ support and review the data supplied with DB.
Andy |
|
| Back to top |
|
|
johntaylor
Posts: 52
|
| Posted: Thu Mar 20, 2008 1:25 am Post subject: |
|
|
I have a notebook compendium of efficiency from multiple sources. But this wikipedia article has accurate data for luminous efficiency of a few light types:
http://en.wikipedia.org/wiki/Luminous_efficacy
(see table 2/3rd the way down)
Perhaps the 18% from your source is luminous Efficacy not luminous efficiency. 18% would be a reasonable number of incandescent efficacy.
But EnergyPlus uses visible fraction of the input energy, which is efficiency, not efficacy. |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by p h p B B
|
|
Home
FAQ
Search
Log in to check your private messages
Usergroups
