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Using custom solar profile within TMY file

asked 2021-08-28 11:24:40 -0500

Aly ElHefny gravatar image

updated 2021-08-28 11:25:35 -0500

Hello everyone, I hope you are all doing well.

Is there a way to have the TMY file run a custom solar trajectory ? Or I have to construct a custom weather file and include all inputs (Not TMY) ?

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answered 2021-08-30 10:46:15 -0500

updated 2021-08-30 10:46:38 -0500

You could try:

  1. Convert a TMY EPW to CSV, replace the solar columns with custom data, then convert back to EPW.
  2. Use the solar EMS actuators here to override the TMY data. I typically use this in conjunction with an EMS sensor tied to a Schedule:File to read a CSV with the raw data.

Check out the weather converter programs documentation for information on creating custom weather files.

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Adding onto option 1, Elements is a free tool that you can use to set weather data in a spreadsheet editor, but it includes rules for air psychrometrics and solar radiation to avoid violating basic physics (>100% RH, e.g.). This can save weather data in EPW format for EnergyPlus or BIN or FMT format for DOE-2. If you're sticking with raw TMY, then you would have to convert the resulting weather file from Elements.

Aaron Boranian gravatar image Aaron Boranian  ( 2021-08-30 12:54:29 -0500 )edit

Hello Bonnema and Aaron, thanks for your helpful replies. All the alternatives look very helpful. That would enable me test the current measured solar data I have. I'm not sure if I can present results from hybrid (historical + real solar) data. After preliminary testing, I believe I might have to generate a complete measured data weather file for the final results. Thanks again !

Aly ElHefny gravatar image Aly ElHefny  ( 2021-09-01 14:06:50 -0500 )edit

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Asked: 2021-08-28 11:24:40 -0500

Seen: 117 times

Last updated: Sep 01