pvlib.pvsystem.pvsyst_celltemp

pvlib.pvsystem.pvsyst_celltemp(poa_global, temp_air, wind_speed=1.0, eta_m=0.1, alpha_absorption=0.9, model_params='freestanding')

Calculate cell temperature using an emperical heat loss factor model as implemented in PVsyst.

The heat loss factors provided through the ‘model_params’ argument represent the combined effect of convection, radiation and conduction, and their values are experimentally determined.

Parameters:

poa_global : numeric

Total incident irradiance in W/m^2.

temp_air : numeric

Ambient dry bulb temperature in degrees 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 is 1.0, which is the wind speed at module height used to determine NOCT.

eta_m : numeric, default 0.1

Module external efficiency as a fraction, i.e., DC power / poa_global.

alpha_absorption : numeric, default 0.9

Absorption coefficient

model_params : string, tuple, or list (no dict), default ‘freestanding’

Heat loss factors to be used.

If string, can be:

• ‘freestanding’ (default)

  Modules with rear surfaces exposed to open air (e.g. rack mounted).

• ‘insulated’

  Modules with rear surfaces in close proximity to another surface (e.g. roof mounted).

If tuple/list, supply parameters in the following order:

• constant_loss_factor : float

  Combined heat loss factor coefficient. Freestanding default is 29, fully insulated arrays is 15.

• wind_loss_factor : float

  Combined heat loss factor influenced by wind. Default is 0.

Returns:

temp_cell : numeric or Series

Cell temperature in degrees Celsius

References

[1]”PVsyst 6 Help”, Files.pvsyst.com, 2018. [Online]. Available: http://files.pvsyst.com/help/index.html. [Accessed: 10- Dec- 2018].

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