[Radiance-general] Daysim and results

[Per Haugaard]

Hi Germán,
Thank you for your reply.The annual energy consumption goes from e.g. 100 kWh/m2 to 108 kWh/m2 when going from an installed lighting power from 5W/m2 to 10 W/m2.It is the 8% increase I do not quite understand.Any input is much appreciated.

Best regards
Per Haugaard 


     Den 15:01 onsdag den 2. september 2015 skrev Germán Molina Larrain <germolinal at gmail.com>:
   

 Hello, 

I think that might make sense. Imagine a room that is perfectly well daylit, where you never need to turn the lights on. It will not matter weather you installed 1W/m2 or 100W/m2, the energy consumption will always be 0kWh/m2.

I would expect that, since you doubled the Lighting Power in the room, the energy consumption also doubled. Does that make sense?

Otherwise... I am not quite sure how Daysim works.

Best, 

Germán

2015-09-02 8:05 GMT-03:00 Per Haugaard <perhaugaard at yahoo.dk>:

Dear userSorry to post my question in this forum, but since it deals with daylight I think that it's ok.
A brief question about Daysim and results.I have made an analysis of a room where I compare the energy savings for artificial lighting by changing the ceiling reflectance. I look at two types of installed effect - 5 W/m2 and 10 W/m2. which is the only difference between the two calculations. There is no solar shading in the model.
I use the same model for both analyzes. This means that I only make a one calculation of daylight coefficients. The light is controlled in both analyzes via photo sensors with dimming (photo-sensor control).
The for my question. Why is there a smaller increase in energy consumption of approximately 1 W/m2 by going from 5 W/m2 to 10 W/m2 installed power? Here I compare 2 x the energy consumption for 5 W/m2 with the energy consumption of 10 W/m2

I look forward to hearing from you

Best regards
Per Haugaard
_______________________________________________
Radiance-general mailing list
Radiance-general at radiance-online.org
http://www.radiance-online.org/mailman/listinfo/radiance-general





  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.radiance-online.org/pipermail/radiance-general/attachments/20150902/00fc3066/attachment.html>