pvpltools.iec61853.faiman

pvpltools.iec61853.faiman(poa_global, temp_air, wind_speed=1.0, u0=25.0, u1=6.84)

Calculate cell or module temperature using an empirical heat loss factor model as proposed by Faiman and adopted in the IEC 61853 standard.

Model is described in [1] and its usage in the IEC 61853 standards [2] and [3] does not distinguish between cell and module temperature.

Parameters:

• poa_global (numeric) – Total incident irradiance [W/m^2].

• temp_air (numeric) – Ambient dry bulb temperature [C].

• wind_speed (numeric, default 1.0) – Wind speed in m/s measured at the same height for which the wind loss factor was determined. The default value 1.0 m/s is the wind speed at module height used to determine NOCT. [m/s]

• u0 (numeric, default 25.0) – Combined heat loss factor coefficient. The default value is one determined by Faiman for 7 silicon modules. [W/(m^2 C)].

• u1 (numeric, default 6.84) – Combined heat loss factor influenced by wind. The default value is one determined by Faiman for 7 silicon modules. [(W/m^2 C)(m/s)].

Return type:

numeric, values in degrees Celsius

Notes

All arguments may be scalars or vectors. If multiple arguments are vectors they must be the same length.

References

[1]

Faiman, D. (2008). “Assessing the outdoor operating temperature of photovoltaic modules.” Progress in Photovoltaics 16(4): 307-315.

[2]

“IEC 61853-2 Photovoltaic (PV) module performance testing and energy rating - Part 2: Spectral responsivity, incidence angle and module operating temperature measurements”. IEC, Geneva, 2018.

[3]

“IEC 61853-3 Photovoltaic (PV) module performance testing and energy rating - Part 3: Energy rating of PV modules”. IEC, Geneva, 2018.

Author: Anton Driesse, PV Performance Labs