Hello,
I am not able to find any weather data for udaipur. I have already tried visiting https://energyplus.net/weather. Is there any other data source to aobtain the weather file?
Can you mail it to me? kubal.pm123@gmail.com
Thanks,
Pratham
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ecotect weather data files
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The shadows of flat surfaces do not appear
Hello, please, I would like some help because my Ecotect 2011 does not transform flat surfaces in closed elements. In this way it does not create shadows of these elements and I can not do analysis on flat roofs. What setting should I change?
Thank you!
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Doubt about calculating of the "hourly solar collection"
Dear all,
I have a doubt related to calcuating of the hourly solar collection.
I know that Ecotect program calculates the hourly solar collection during period of sunshine automatically.
But, I want to calculate the hourly solar collection during specific period (i.e. 10:00 ~ 13:00),
and I want to know how I can see the one-hour unit solar collection in Ecotect.
I would be grateful if you help me solve that problems.
Thanks 
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Re: ecotect weather data files
Hello Olivier,
I need some help. I use Ecotect and in this moment the weather files by the Energy Ples Weather are not avaible.
Do you know what I have to do? Or another way that I can find this files?
Cheers,
Camila.
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Re: ecotect weather data files
Hello camila.batista,
it looks like the weather data has changed its website. You can find it here now: https://energyplus.net/weather
Best,
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Re: The shadows of flat surfaces do not appear
Hello rgiaretta,
It is difficult to troubleshoot from a screen shot, but I would first make sure that you have your floor objects assigned as FLOOR element and make sure their surface normals are pointing down. You can check your objects surface normals by CRTl+F9. You can reverse the selected object's surface normal by Crtl+R.
Oftentime, if the objects have the wrong element, it will mess up the shadowing - this is particularly true for the FLOOR elements.
If that does not work, just email me the *.eco file and I will have a look at it.
Cheers,
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Re: Doubt about calculating of the "hourly solar collection"
Hello slemfdltodn,
I think what want to do is:
1. Select your object.
2. Calculate menu > Solar Access Analysis > Incident Solar Radiation
3. Select Current Date and Time in step 2.
4. Only use Selected object in step 3.
5. Follow the rest of the wizard to the end.
Once the calculation is done - this particular calculation method can take a while - all you have to do is change the date and time in the tool bar and the values will update automatically.
I hope that helps.
Cheers,
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Re: ecotect weather data files
Hello architectpratham
If you do not find the file there, you may have to ask local airport or Universities for collected climate data. It is possible to import weather files from spreadsheets etc. if you have all that is required: temperature, humidity, wind speed, solar radiation etc...
Or you can download an EPW file from another city which would have a similar climate.
Best,
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Re: Doubt about calculating of the "hourly solar collection"
Dear Mr. Pennetier,
Thanks for your answer.
and I think that I have to explain my question in detail.
First, I know the method of calculating solar electricity generation, and I can see the results of calculation of electricity as you can see below image.
As you can see, the result of calculating electriciy present by month.
But I wander that the method of measuring PV electricity generation every an hour.
Also I want to know how I can set the period (i.e. 8:00~12:00) that calculate solar electricity generation.
Thanks~
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Re: Doubt about calculating of the "hourly solar collection"
Hello slemfdltodn,
I understand now...
Unfortunately, no you cannot set this particular function to work as a per-hour basis - only as a per-day basis if you change the date range.
However, it is possible to have Ecotect do that via a script, as all it is doing in this operation is to multiply the % efficacy from the selected SOLAR COLLECTOR by the amount of incident radiation.
Select your collector object and run the attached script - you will have to change the file extension from *.txt to *.scr and run it via the Ecotect Script Manager or simply drop it in the Ecotect canvas. Change the date and time at line 27 and 29 of the script.
--[[------------------------------------------------------------------------------------------------
-- This script calculates hourly electrical output generated from the incident radiation on the
-- selected planar object.
-- Olivier A. PENNETIER | January 2016
--]]------------------------------------------------------------------------------------------------
-- GET MODEL"S LATITUDE ----------------------------------------------------------------------------
lat = get("project.latitude")
if lat < 0 then l = 1 else l = -1
end
-- GET SOLAR COLLECTOR EFFICIENCY AND AREA----------------------------------------------------------
Eff = getUserInput("Solar Collector Efficiency [%]:", 10)
area = get("selection.area")
-- PRINT TABLE HEADERS -----------------------------------------------------------------------------
printf("MODEL: %s", get("model.file"));
printf("INCIDENT RADIATION (W/m2)");
printf("COLLECTOR EFFICIENCY: %0.2f", Eff/100);
printf("COLLECTOR AREA (m2): %0.1f", area);
printf("\nDAY\tHOUR\tRADIATION (W/m2)");
-- RESET CUMULATIVE RADIATION ----------------------------------------------------------------------
cumrad = 0.0
-- SET DAY AND TIME --------------------------------------------------------------------------------
for day = 1,2 do
set("juliandate", day)
for hour = 00,23 do
set("model.time", hour)
-- REFRESH SCREEN ----------------------------------------------------------------------------------
if (get("model.display") ~= 1) and (get("view.visible") > 1) then cmd("view.redraw")
end
-- CALCULATE RADIATION ON OBJECT -------------------------------------------------------------------
set("shading.accuracy", 3)
set("shading.angles", 2, 2)
cmd("calc.insolation", objects, 0, 1, 2)
radiation = get("selection.attr1", o)
cumrad = cumrad + radiation
printf("%03d\t%02d\t%6.1f", day, hour, radiation)
end
end
-- CALCULATE COLLECTOR ELECTRICAL OUTPUT -----------------------------------------------------------
printf("\nTOTAL CUMMULATIVE RADIATION (W/m2): %0.2f", cumrad);
PVoutput = cumrad * (Eff/100) * area
printf("\nTOTAL ELECTRICAL OUTPUT RADIATION (Wh): %0.2f", PVoutput);
Cheers,
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Re: Doubt about calculating of the "hourly solar collection"
Hi Pennetier!
Thanks for your answer and it is very helpful for me.
I have one more question about this problem that calculating of the hourly solar collection.
I understood your anwer and script,but I have a doubt about the mean of "shade accuracy" and "shade angles" in your script.
I look forward to your anwer for my question
Thanks!!
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Re: Doubt about calculating of the "hourly solar collection"
Hello slemfdltodn,
The "shading .accuracy" and "shading.angles" are simply the commands for the settings of the shading masks that needs to be done on the collector to determine how much shading it receives.
For the shading accuracy, the number you chose determine the level of accuracy, similar that when you do it from the wizard:
For the shading angles, the two numbers determine the degree increment for the azimuth and altitude, for which the shading mask is calculated. The smaller the number, the more accurate the calculation, but also more time consuming. The minimum number here is 2 degrees.
You should refer to the "Shading Mask" Help topic for more information on what these shading masks are all about.
All the best,
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Re: create view point file for Daysim
Dear,
I followed your instructions about how to create a view point file for daysim but I stuck at step 6 where I have to save the file as .vf. How can I do it?
Also should I Copy and and paste onto a .txt file?
Please help.
I am looking forward to hearing from you.
Best regards,
Chryso
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Re: create view point file for Daysim
Hello chrysohe,
Yes, i am sorry this wasn't very clear.
I meant to say that you copy and paste into a text editor such as notepad. Now if you were to just "save" that file, it would save as a *.txt file. But what you want is a *.vf file, so when you go to "save as" in your text editor, after your file name type .vf and it should save as *.vf.
That's it.
Cheers,
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Creating prismatic glass in Ecotect
Dear all,
I have a question I would appreciate if you could help me on. I want to create prismatic glass in Ecotect for Radiance analysis. As far as I know I can change some glass specifications like UV value, thickness, etc.. But as I want to do a study for daylighting, I belive the different surface of this kind og glass matters. Is there a way to define the geometry of the material also? Attached shows the prismatic glass.
Thank you in advance for your time?
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Re: create view point file for Daysim
Thank you very much Pennetrier,
It works!!
I will be more than grateful if you can response to another question.
I am using the Ecotect Radiance/Daysim exporter. I have created the view point file and I run the simulation.
Where is this file saved? Where can I find the DGP values? Can I find somewhere the Image of my fisheye view showing the glare source with colour?
Looking forward to hearing from you.
Chryso
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Re: create view point file for Daysim
Hello chrysohe,
DGP (Daylight Glare Probability) can be computed via the Evalglare.exe that comes with Daysim, but in fact you do not need to go through Daysim to do this. You can simply create a fisheye luminance view in Ecotect and render it through Radiance. Once you have create the fisheye luminance image *.pic, you have a few options:
1. You can manually run the evalglare.exe program, which requires a little bit of gymnastic as you have to go through a DOS command prompt to run evalglare.exe calculations. That is the main approach and a very good tutorial about doing this can be found at this link: GLARE ANALYSIS WITH EVALGLARE from Harvard University. The result will be an image with colored areas of potential glare, as well as DGP and other glare indices.
2. An easier way I have recently found is to use an application called hdrscope, which will compute the same calculations but all within a graphical interface that makes it easier to use than DOS command prompt. You can download the application at this site:hdrscope.
Whichever method you use, you will end up with the same rendered image showing areas of glare, such as this one:
Best,
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Re: create view point file for Daysim
Dear Pennetier1,
Really thank you for your very helpful information!!!!
I have downloaded the hdrscope in order to evaluate glare. Do you have any tutorial for the glare analysis as the evalglare documentation is no longer online available.
Actually I inserted a *pic image in the hdrscope and the I selected Tool> Analyze> glare analysis> entire image>set view by type (hemispherical fish eye 180, 180) and in the advanced option I didn't select anything and when I finished the analysis nothing happened on my image. No colours appearing in my image to show glare potential.
Do you have any idea why this happens? I believe I should have glare.
THANKS once again.
Looking forward to hearing from you.
Chryso
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Re: create view point file for Daysim
Hello chrysohe,
I do not know why this is not working for you.
First, I would not change the view type > hemispherical option if your original image is already fisheye. This option is only if your original image is NOT hemispherical as far as I understand, so you really do not have to select this option.
Second, I would make sure that your fisheye image is indeed a luminance image and not a illuminance image calculation (cd/m2 and not lux), since that is how glare is defined. I have a feeling you used radiance to calculate illuminance rather than luminance.
Also, make sure that your image is not larger than 800x800 pixel, as evalglare does not work on higher size. You can adjust the size of your image in the Ecotect's wizard for Radiance.
As far as documentation, I am attaching the evalglare's documentation that came with the version I am using. Not much to it. Also you can go through the hdrscope documentation online at their website.
Hope that helps,
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Re: create view point file for Daysim
Dear Pennetier1,
I am more than grateful to you. Thank you very much.
The problem was that I made illuminance image calculation (lux).
Best wishes,
Chryso
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