[Radiance-general] Daysim and results

[Germán Molina Larrain]

mmm... Is one set of luminaires more efficient? or does one of them
actually illuminates more?


2015-09-02 10:12 GMT-03:00 Per Haugaard <perhaugaard at yahoo.dk>:

> 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 user
> Sorry 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
>
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