Re: [TRNSYS-users] Type64 Shading Masks

[David BRADLEY <d.bradley@tess-inc.com>]

Cédric,
  Type64 assumes that the surface that contains the opening forms part of the mask. For example, if the opening is in a vertical surface then the opening can't "see" behind itself so in effect it has an infinitely tall mask for all surface angles behind the opening. You'll notice that in your table below, the output of Type15 and the output of Type64 is the same when you have a horizontal surface. In the other two cases (30° and 45° tilt) there is some difference because the surface itself creates a mask.
Best,
 David

On 4/1/2014 10:39, PAULUS Cedric 217865 wrote:

Dear TRNSYS users,

 

I would like to have more information about the output 7 to 11 from type64. I thought it was the radiation on horizontal taking into account the mask.

 

I try with a mask file that has NO MASK and the irradiation on horizontal change with the tilt and is different from the irradiation on horizontal that is provide as input of type 64. See the table below :

 

	Type 15 (input type 64)						Output type 64						Difference
TIME	Total Irradiation on horizontal	Beam irradiation on horizontal	Total diffuse irradiation on horizontal	Total Irradiation on tilt surface	Beam irradiation on tilt surface	Total diffuse irradiation on tilt surface	Total Irradiation on horizontal	Beam irradiation on horizontal	Total diffuse irradiation on horizontal	Total Irradiation on tilt surface	Beam irradiation on tilt surface	Total diffuse irradiation on tilt surface	Total Irradiation on horizontal	Beam irradiation on horizontal	Total diffuse irradiation on horizontal	Total Irradiation on tilt surface	Beam irradiation on tilt surface	Total diffuse irradiation on tilt surface
Tilt 45° (input7)	4 193 276.05	1 947 898.25	2 245 377.80	4 807 723.85	2 449 319.72	2 358 404.13	3 739 425.12	1 938 636.13	1 800 788.99	4 807 695.74	2 449 291.61	2 358 404.13	453 850.94	9 262.12	444 588.81	28.11	28.11	-
Tilt 30° (input7)	4 193 276.05	1 947 898.25	2 245 377.80	4 836 905.84	2 439 304.04	2 397 601.80	3 846 810.79	1 940 710.97	1 906 099.82	4 836 818.98	2 439 217.18	2 397 601.80	346 465.26	7 187.28	339 277.98	86.86	86.86	-
Tilt 0° (Horizontal) (input7)	4 193 276.05	1 947 898.25	2 245 377.80	4 192 998.65	1 947 898.25	2 245 100.40	4 193 216.91	1 947 898.25	2 245 318.66	4 192 998.65	1 947 898.25	2 245 100.40	59.14	-	59.14	-	-	-

 

Do you have any explanation ?

 

Best regards,

 

 

Cédric Paulus Chef de Projets Département Thermique Biomasse et Hydrogène Service Biomasse et Réseaux Thermiques Laboratoire Système Solaire Haute Température Commissariat à l’énergie atomique et aux énergies alternatives 50 avenue du Lac Léman | F-73377 Le Bourget-du-Lac T. +33 (0)4 79 79 21 17 | F. +33 (0)4 79 62 13 74 cedric.paulus@cea.fr website : http://www.ines-solaire.org - http://www.liten.fr

Pensez à l'environnement, n'imprimez cet email que si c'est vraiment nécessaire.

 

 

_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley@tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com