[TRNSYS-users] Surprising phenomenon with Type 67

[Enertech]

Dear Diego,

Thanks for this advice, I was using version 16.01.0002 and with version 
16.01.0003 the error did not occured again.
However, I've got some additional questions on Type 67:

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!
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.

.tpf, angular obstruction data files (normal and simplified) and printed 
values of total and beam radiations are attached to this e-mail.

Given these results, and since solar gains is probably the most important 
phenomenon to assess building energy performance, I would be gratefull for 
any explanation. The following questions might help:
1 - On weather data, which sky model should we use? Given that Type34 
probably use an isotropic sky model, I used this one in the weather data.
2 - In angular obstruction data files, for angles directed inside the 
building (eg 0° for North orientation), which angular height should be 
used? (0°, 90°, it doesn' matter?)

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?
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?

Thanks in advance for you help,
Best regards,


At 22:20 04/06/2007, you wrote:
>Dear David,
>I was not able to reproduce the error.  Which version that you are 
>running? (16.01.xxxx)
>Please try downloading the latest version 16.01.0003.
>Best regards,
>
>Diego
>
>Enertech wrote:
>>Dear Trnsys Users,
>>
>>I've identified quite a strange phenomenon with Type 67.
>>I've used an empty shading mask for south orientation, that is, angular 
>>height from azimuth -90° to 90° is 0, and it's 90 form 90° to 180° and 
>>from -180° to -90°.
>>The shading mask has no effect on beam radiation except... each day at 13 
>>o'clock, as you can see on the printed values of the beam radiation 
>>before and after the shading mask. At 13 o'clock, the shading mask turns 
>>the beam radiation to 0.
>>
>>.tpf, mask and printed values are attached to this e-mail.
>>
>>Do you have any explanation ?
>>Thanks in advance for your help,
>>
>>Best regards,
>>
>>
>>
>>===========================
>>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
>>================================
>>
>--
>Diego A. Arias
>TRNSYS Coordinator
>Solar Energy Laboratory
>University of Wisconsin - Madison
>1500 Engineering Drive
>Madison, WI 53706

===========================
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	)

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1	! ID for each orientation (or opening)
90	! Slope for each orientation
0	! Azimuth for each orientation
-180	-90	0	90	! View angles - ALWAYS (-180:step:180-step)
0.0	 ! Obstruction height for	Sud	0	angle	1	(	-180	to	-90	)
0.0	 ! Obstruction height for	Sud	0	angle	2	(	-90	to	0	)
0.0	 ! Obstruction height for	Sud	0	angle	3	(	0	to	90	)
0.0	 ! Obstruction height for	Sud	0	angle	4	(	90	to	180	)