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Schedule for Photovoltaic Efficiency in Simple mode

asked 2019-01-11 21:41:31 -0600

updated 2019-01-16 08:04:20 -0600

How can I create an schedule for energy efficiency to add in the "PhotovoltaicPerformanceSimple" using the Conversion mode scheduled depend on the temperature of the surface of painel? I want to relate the surface temperature (or at last the temperature of wheather file) to the effiency of the painel. Could be with a equation or a table of temperature x = efficiency y. It is possible? I want to compare some different tecnologies production.

Thank You.

Henrique Lauffer

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answered 2019-01-16 04:23:40 -0600

If you want to use the PhotovoltaicPerformance:Simple option, then I would suggest to run two simulations:

  • The first one is to obtain the surface temperature, by reporting the Surface Outside Face Temperature on a Timestep level. Make sure, that the modeled surface has similar construction materials to a PV panel's materials. Once you have this, you can calculate the efficiency of the PV system in excel for every timestep and save it in a .csv file. In the documentation of SAM equation 9.32 can help you determine, how change in temperature changes the efficiency. This equation is using cell temperature, which is usually 0-3 degrees higher, than the surface temperature.
  • Then you can import the .csv to EnergyPlus with the Schedule:File object and run the simulation again, with the new efficiency schedule to get the PV output.

An other option is, to go for a more detailed PV model, like PhotovoltaicPerformance:EquivalentOne-Diode or PhotovoltaicPerformance:Sandia which have the temperature dependency already built-in. I would only suggest to go for this option, if you now exactly what type of PV modules you have, and you can get their exact parameters from the Sandia or CEC database.

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Asked: 2019-01-11 21:41:31 -0600

Seen: 103 times

Last updated: 2 days ago