EnergyPlus: Strange peak of the incident solar radiation

asked 2020-04-15 03:29:35 -0600

Juanita Solano gravatar image

updated 2020-04-15 09:52:22 -0600

Hello everybody,

I'm currently working on a model of an office located in Straelen, Germany. For it I had to create my own weather file using data from a weather station nearby (attached in link below). I used the weather converter from EnergyPlus by first converting an already existing .epw file into .csv. Then I replaced the data with the one from my weather station, and converted it back again to .epw.

The simulation ran without a problem; however, when I look at the incident solar radiation output (at the facade) from EnergyPlus, I see a very strong peak early in the morning which is causing a sudden increase in my room temperature. I ran my model using a different weather file and the peaks disappear, but if you look at the global irradiation from the weather station plotted in the attached picture, the curve looks smooth and it doesn't have any peaks, so I don't really know what is causing this.

Has anybody ever faced a problem like this when creating your own weather file? I would really appreciate it if maybe you could try running one of your models with my weather data file and see if you see peaks like these.

Thanks in advance for your help :)

Cheers, Juanita

Weather file in Google Drive (for some reason I couldn't attach it here directly)-->

image description

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There seems to be some problem with weather data. I feel sunrise and sunset time is wrong. Plot the monthly profiles of GHI and recheck it.

Aravinda27 gravatar image Aravinda27  ( 2020-04-22 09:34:01 -0600 )edit

I agree that there seems to be something wrong with the weather data. It reaches almost twice the extraterrestrial solar radiation! And with these peaks probably something to do with the direct component of radiation.

aubr gravatar image aubr  ( 2020-04-24 10:46:49 -0600 )edit