pvlib.irradiance.get_extra_radiation

pvlib.irradiance.get_extra_radiation(datetime_or_doy, solar_constant=1366.1, method='spencer', epoch_year=2014, **kwargs)

Determine extraterrestrial radiation from day of year.

Specific references for each method are cited in the parameter descriptions below, while a more general discussion of the different models may also be found in [1] and [2].

Parameters:

• datetime_or_doy (numeric, array, date, datetime, Timestamp, DatetimeIndex) – Day of year, array of days of year, or datetime-like object

• solar_constant (float, default 1366.1) – The solar constant. [Wm⁻²]

• method (string, default spencer) – The method by which the extraterrestrial radiation should be calculated. Options include: pyephem, spencer [3], asce [4], ‘nrel’ [6].

• epoch_year (int, default 2014) – The year in which a day of year input will be calculated. Only applies to day of year input used with the pyephem or nrel methods.

• kwargs – Passed to nrel_earthsun_distance().

Returns:

dni_extra (float, array, or Series) – The extraterrestrial radiation normal to the sun. Pandas Timestamp and DatetimeIndex inputs for datetime_or_doy will return dni_extra as a Pandas TimeSeries. All other input data types will yield dni_extra as a float or an array of floats. See dni_extra. [Wm⁻²]

References

[1]

M. Reno, C. Hansen, and J. Stein, “Global Horizontal Irradiance Clear Sky Models: Implementation and Analysis”, Sandia National Laboratories, SAND2012-2389, 2012. DOI: 10.2172/1039404

[2]

J. A. Duffie, W. A. Beckman, N. Blair, “Solar Radiation”, in Solar Engineering of Thermal Processes, Photovoltaics and Wind, 5th ed, New York, USA: J. Wiley and Sons, 2020, pp. 3-44. DOI: 10.1002/9781119540328

[3]

J. W. Spencer, “Fourier series representation of the sun,” Search, vol. 2, p. 172, 1971.

[4]

R. G. Allen et al., Eds. The ASCE standardized reference evapotranspiration equation. Reston, Va.: American Society of Civil Engineers, 2005. DOI: 10.1061/9780784408056

[6]

I. Reda, A. Andreas, “Solar position algorithm for solar radiation applications” NREL Golden, USA. NREL/TP-560-34302, Revised 2008. DOI: 10.2172/15003974

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