pvlib.temperature.sapm_module#

pvlib.temperature.sapm_module(poa_global, temp_air, wind_speed, a, b)[source]#

Calculate module back surface temperature per the Sandia Array Performance Model.

See 1 for details on the Sandia Array Performance Model.

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

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

  • wind_speed (numeric) – Wind speed at a height of 10 meters [m/s].

  • a (float) – Parameter \(a\) in (1).

  • b (float) – Parameter \(b\) in (1).

Returns

numeric, values in degrees C.

Notes

The model for module temperature \(T_{m}\) is given by Eq. 11 in 1.

(1)#\[T_{m} = E \times \exp (a + b \times WS) + T_{a}\]

Inputs to the model are plane-of-array irradiance \(E\) (W/m2) and ambient air temperature \(T_{a}\) (C). Model outputs are surface temperature at the back of the module \(T_{m}\) and cell temperature \(T_{C}\). Model parameters depend both on the module construction and its mounting. Parameter sets are provided in 1 for representative modules and mounting, and are coded for convenience in TEMPERATURE_MODEL_PARAMETERS.

Module

Mounting

a

b

\(\Delta T [C]\)

glass/glass

open rack

-3.47

-0.0594

3

glass/glass

close roof

-2.98

-0.0471

1

glass/polymer

open rack

-3.56

-0.075

3

glass/polymer

insulated back

-2.81

-0.0455

0

References

1(1,2,3)

King, D. et al, 2004, “Sandia Photovoltaic Array Performance Model”, SAND Report 3535, Sandia National Laboratories, Albuquerque, NM.