Hi all,
I was wondering which could be the best way to convert the direct solar
irradiance value of 50W/m2 on the workplane (used as a criteria to
automatically pull down the blinds in Daysim) to an illuminance value. I
guess I should use a luminous efficiency but which one? Could anybody help
me?
Best,
Silvia Cammarano
arch. Silvia Cammarano
PhD student in Energetics
Politecnico di Torino
DENERG: Department of Energy
Corso Duca degli Abruzzi, 24
10129 Torino
Italy
office: +39 0110904410
fax: +39 0110904499
skype: silvia.cammarano
www.polito.it/tebe
Sorry, the discussion I mentioned started from this post:
http://radiance-online.org/pipermail/radiance-general/2013-January/009135.html
Ji
···
On Wed, Jul 17, 2013 at 9:39 PM, Cammarano Silvia < [email protected]> wrote:
Hi all,****
I was wondering which could be the best way to convert the direct solar
irradiance value of 50W/m2 on the workplane (used as a criteria to
automatically pull down the blinds in Daysim) to an illuminance value. I
guess I should use a luminous efficiency but which one? Could anybody help
me?****
** **
Best,****
** **
Silvia Cammarano****
** **
** **
** **
*arch. Silvia Cammarano*
*PhD student in Energetics*
* *
Politecnico di Torino****
DENERG: Department of Energy****
Corso Duca degli Abruzzi, 24****
10129 Torino****
Italy****
** **
office: +39 0110904410****
fax: +39 0110904499****
skype: silvia.cammarano****
** **
www.polito.it/tebe****
** **
_______________________________________________
Radiance-daysim mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-daysim
Hi, Silvia, the following discussion in a previous post on luminous
efficacy might be helpful, and especially Lars' comments:
"So, whenever possible, I'd use the photometric units for input when I need
photometric results. This means you are working with well-defined
conversions."
http://radiance-online.org/pipermail/radiance-general/2013-January/009138.html
Ji
···
On Wed, Jul 17, 2013 at 9:39 PM, Cammarano Silvia < [email protected]> wrote:
Hi all,****
I was wondering which could be the best way to convert the direct solar
irradiance value of 50W/m2 on the workplane (used as a criteria to
automatically pull down the blinds in Daysim) to an illuminance value. I
guess I should use a luminous efficiency but which one? Could anybody help
me?****
** **
Best,****
** **
Silvia Cammarano****
** **
** **
** **
*arch. Silvia Cammarano*
*PhD student in Energetics*
* *
Politecnico di Torino****
DENERG: Department of Energy****
Corso Duca degli Abruzzi, 24****
10129 Torino****
Italy****
** **
office: +39 0110904410****
fax: +39 0110904499****
skype: silvia.cammarano****
** **
www.polito.it/tebe****
** **
_______________________________________________
Radiance-daysim mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-daysim
Hi Silvia,
Daysim should use the Perez-sky luminous efficacy model in order to determine that, which will change based on the hourly data in the weather file.
In general, Daysim's 50W/m2 is measured as a direct normal irradiance, so it assumes the sensor is always oriented towards the sun. In this case, the control threshold will not relate directly to horizontal workplane illuminance.
If you are interested in controlling shading systems based on a specific illuminance threshold, the automated thermal control method in Daysim can achieve that. For more information see the following link, http://daysim.ning.com/page/daysim-shading-control-modes
Best,
Alstan
···
On Wed, 17 Jul 2013 09:39:51 -0400, Cammarano Silvia <[email protected]> wrote:
Hi all,
I was wondering which could be the best way to convert the direct solar
irradiance value of 50W/m2 on the workplane (used as a criteria to
automatically pull down the blinds in Daysim) to an illuminance value. I
guess I should use a luminous efficiency but which one? Could anybody help
me?
Best,
Silvia Cammarano
arch. Silvia Cammarano
PhD student in Energetics
Politecnico di Torino
DENERG: Department of Energy
Corso Duca degli Abruzzi, 24
10129 Torino
Italy
office: +39 0110904410
fax: +39 0110904499
skype: silvia.cammarano
www.polito.it/tebe
--
J. Alstan Jakubiec
http://www.jakubiec.net
(912) 247-1086