MRT - Measured X Simulated

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carolinagusson
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MRT - Measured X Simulated

Postby carolinagusson » Mon Feb 02, 2015 7:51 pm

Dear Michael and team,

I made a simulation to calibrate the model, I compared air temperature, radiation, relative humidity and mean radiant temperature, in the same location. The last one showed a big difference between measured and simulated data.
To compare both results (measured and simulated) for MRT, I used the black bulb temperature and the air temperature (measured) to calculated the MRT according to ISO 7726.
I also made a radiation adjustment based on ENVI-met 3.
How ENVI-met 4 calculated the Mean radiant temperature?
Why the results are so different from MRT?
I send below the graphs and the simulated area to help answer the question.
If you need more information, you can ask me.
Thank you!
Carolina

Air temperature.jpg
Air temperature.jpg (45.37 KiB) Viewed 313 times

Global Radiation.jpg
Global Radiation.jpg (43.25 KiB) Viewed 313 times

Mean Radiant Temperature.jpg
Mean Radiant Temperature.jpg (43.53 KiB) Viewed 313 times

carolinagusson
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Re: MRT - Measured X Simulated

Postby carolinagusson » Mon Feb 02, 2015 7:53 pm

MRT.jpg
MRT.jpg (156.21 KiB) Viewed 311 times

enviadmin
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Re: MRT - Measured X Simulated

Postby enviadmin » Mon Feb 02, 2015 9:53 pm

Hi Carolina,
I can't tell... Obvoiusly fluxes are different e.g reflected radiation or other aspects.
Especially if you are in the shade

Michael

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Re: MRT - Measured X Simulated

Postby enviadmin » Mon Feb 02, 2015 9:55 pm

By the way: air temperature is not important for mrt, but why not try getting it correct using simple forcing...
Michael

carolinagusson
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Re: MRT - Measured X Simulated

Postby carolinagusson » Tue Feb 03, 2015 2:42 pm

Hi Michael,

Thank you for the answer.
I made the simulation using the simple forcing, the input for air temperature and air humidity was the measured values (showed in the graph), but the model answer with lower values...So I need to change the input for air temperature in simple forcing (to higher values) to reach the measured one? Is this what you suggest?
Do you have any suggestion for Mean Radiant Temperature, e.g. change the materials` thermal characteristics?
Thank you again!
Carolina

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Re: MRT - Measured X Simulated

Postby enviadmin » Tue Feb 03, 2015 5:44 pm

Seems that the the meassured Temp and the modeled one do not match.
But from just one point meassuement in such a complex environmwnt it is not possible to give any advices.

Michael

carolinagusson
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Re: MRT - Measured X Simulated

Postby carolinagusson » Tue Feb 03, 2015 8:29 pm

Yes! I had an air temperature difference between -0.71 to +3.94°C.
I have already made a simulation with smaller grids (a more detailed and smaller model), but the results was the same.
Now, I will simulate using the last version of V4.

soz
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Re: MRT - Measured X Simulated

Postby soz » Tue Aug 04, 2015 12:30 pm

Dear Carolina,

what did you do to reduce error between simulated and measured air temperature ? what about MRT? I will be thank full for your answer!

thank you for your reply!
BR
Soz


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