pvlib.temperature.sapm_cell#

pvlib.temperature.sapm_cell(poa_global, temp_air, wind_speed, a, b, deltaT, irrad_ref=1000.0)[source]#

Calculate cell 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).

  • deltaT (float) – Parameter \(\Delta T\) in (2) [C].

  • irrad_ref (float, default 1000) – Reference irradiance, parameter \(E_{0}\) in (2) [W/m^2].

Returns:

numeric, values in degrees C.

Notes

The model for cell temperature \(T_{C}\) is given by a pair of equations (Eq. 11 and 12 in [1]).

(1)#\[T_{m} = E \times \exp (a + b \times WS) + T_{a}\]
(2)#\[T_{C} = T_{m} + \frac{E}{E_{0}} \Delta T\]

The module back surface temperature \(T_{m}\) is implemented in sapm_module().

Inputs to the model are plane-of-array irradiance \(E\) (W/m2) and ambient air temperature \(T_{a}\) (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 mount

-2.98

-0.0471

1

glass/polymer

open rack

-3.56

-0.075

3

glass/polymer

insulated back

-2.81

-0.0455

0

Mounting cases can be described in terms of air flow across and around the rear-facing surface of the module:

  • “open rack” refers to mounting that allows relatively free air flow. This case is typical of ground-mounted systems on fixed racking or single axis trackers.

  • “close mount” refers to limited or restricted air flow. This case is typical of roof-mounted systems with some gap behind the module.

  • “insulated back” refers to systems with no air flow contacting the rear surface of the module. This case is typical of building-integrated PV systems, or systems laid flat on a ground surface.

References

Examples

>>> from pvlib.temperature import sapm_cell, TEMPERATURE_MODEL_PARAMETERS
>>> params = TEMPERATURE_MODEL_PARAMETERS['sapm']['open_rack_glass_glass']
>>> sapm_cell(1000, 10, 0, **params)
44.11703066106086