[TRNSYS-users] Surprising phenomenon with Type 67

Wed Jun 13 01:57:21 PDT 2007

David, Diego,

Thanks for your answers.
Seeing your examples, it turns out that Type 34 alone, and Type 67 alone, 
do work out well.
Nevertheless, another simulation is enclosed, using Type 34 AND Type 67. It 
seems that diffuse radiation isn't calculated properly by Type 34 when 
coupled with Type 67.
Do you agree and can you help me with this phenomenon?

Thank you in advance for your help,

===========================
David Chénier
ENERTECH
F-26160 FELINES SUR RIMANDOULE
tel-fax : 04 75 90 18 54
Email : sidler at club-internet.fr
Web  : http://sidler.club.fr
================================

At 18:51 07/06/2007, Diego A. Arias wrote:
>Hi David,
>
>I would like to add the following comments to Dave's answers.
>>I've realised the following experience: I've used Type67 without shadings 
>>(angular height equal to 0°) and Type34 without shadings (overhang 
>>projection and wingwalls projection equal to 0).
>>Direct and diffuse radiation should not change. Actually, diffuse 
>>radiation vary. It's sometimes even greater after Type34 than before!
>You got me very worried with this possible bug. I am attaching a very 
>simple project. I used the types 15 and 67, in your project; I made two 
>modifications: the slope in Type15 was set to zero in the file that you 
>sent us; I set it to 90, and I got rid of the equation component.  I think 
>that Type67 is working fine.
>>Another phenomenon : I've tried the experience with a "detailed" angular 
>>obstruction data file (24 surface angles) and a simplified one (4 surface 
>>angles): it turns out that with the simplified obstruction data file, 
>>diffuse radiation after Type34 varies with a greater amplitude.
>I agree with you on this topic.  Until we release a new version, I would 
>recommend that your shading mask is more detailed than just a few angles.
>
>>Finally, questions about basic use type 67 follow :
>>5 - I cannot use more than 20 orientations with type 67 eventhough the 
>>max is 40 in the proforma. Can you help me?
>In the attached example, I used 37 orientations.
>>6 - Besides, I did not manage to use 2 type 67 at the same time. I made a 
>>few tests using 2 type 67 and it always generate an error of reading of 
>>the external file, while both types 67 work alone. Is there a bug somewhere?
>Regards,
>
>Diego
>
>--
>Diego A. Arias
>TRNSYS Coordinator
>Solar Energy Laboratory
>University of Wisconsin - Madison
>1500 Engineering Drive
>Madison, WI 53706
>
>
>1       ! ID for each orientation (or opening)
>90      ! Slope for each orientation
>0       ! Azimuth for each orientation
>-180    -170    -160    -150    -140    -130    -120    -110    -100 
>-90     -80     -70     -60     -50     -40     -30     -20     -10     0 
>      10      20      30      40      50      60      70      80      90 
>    100     110     120     130     140     150     160     170     180
>0 
>
>0 
>
>0 
>
>0 
>
>0 
>
>0 
>
>0 
>
>0 
>
>0 
>
>0 
>
>0 
>
>0 
>
>0 
>
>0 
>
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>0
>
>
>

===========================
ENERTECH
F-26160 FELINES SUR RIMANDOULE
tel-fax : 04 75 90 18 54
Email : sidler at club-internet.fr
Web  : http://sidler.club.fr
================================ 
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1	! ID for each orientation (or opening)
90	! Slope for each orientation
0	! Azimuth for each orientation
-180	-165	-150	-135	-120	-105	-90	-75	-60	-45	-30	-15	0	15	30	45	60	75	90	105	120	135	150	165	! View angles - ALWAYS (-180:step:180-step)
0.0	 ! Obstruction height for	Sud	0	angle	1	(	-180	to	-165	)
0.0	 ! Obstruction height for	Sud	0	angle	2	(	-165	to	-150	)
0.0	 ! Obstruction height for	Sud	0	angle	3	(	-150	to	-135	)
0.0	 ! Obstruction height for	Sud	0	angle	4	(	-135	to	-120	)
0.0	 ! Obstruction height for	Sud	0	angle	5	(	-120	to	-105	)
0.0	 ! Obstruction height for	Sud	0	angle	6	(	-105	to	-90	)
0.0	 ! Obstruction height for	Sud	0	angle	7	(	-90	to	-75	)
0.0	 ! Obstruction height for	Sud	0	angle	8	(	-75	to	-60	)
0.0	 ! Obstruction height for	Sud	0	angle	9	(	-60	to	-45	)
0.0	 ! Obstruction height for	Sud	0	angle	10	(	-45	to	-30	)
0.0	 ! Obstruction height for	Sud	0	angle	11	(	-30	to	-15	)
0.0	 ! Obstruction height for	Sud	0	angle	12	(	-15	to	0	)
0.0	 ! Obstruction height for	Sud	0	angle	13	(	0	to	15	)
0.0	 ! Obstruction height for	Sud	0	angle	14	(	15	to	30	)
0.0	 ! Obstruction height for	Sud	0	angle	15	(	30	to	45	)
0.0	 ! Obstruction height for	Sud	0	angle	16	(	45	to	60	)
0.0	 ! Obstruction height for	Sud	0	angle	17	(	60	to	75	)
0.0	 ! Obstruction height for	Sud	0	angle	18	(	75	to	90	)
0.0	 ! Obstruction height for	Sud	0	angle	19	(	90	to	105	)
0.0	 ! Obstruction height for	Sud	0	angle	20	(	105	to	120	)
0.0	 ! Obstruction height for	Sud	0	angle	21	(	120	to	135	)
0.0	 ! Obstruction height for	Sud	0	angle	22	(	135	to	150	)
0.0	 ! Obstruction height for	Sud	0	angle	23	(	150	to	165	)
0.0	 ! Obstruction height for	Sud	0	angle	24	(	165	to	180	)