pvdeg.standards.eff_gap#

pvdeg.standards.eff_gap(T_0, T_inf, T_measured, T_ambient, poa, x_0=6.5, poa_min=100, t_amb_min=0)[source]#

Calculate the effective standoff distance for rooftop mounded PV system according to IEC TS 63126. The 98ᵗʰ percentile calculations for T_0 and T_inf are also calculated.

Parameters:

T_0 (float) – An array of temperature values for a module with an insulated back or an alternatively desired small or zero standoff. Used as the basis for the maximum achievable temperature, [°C].
T_inf (float) – An array of temperature values for a module that is rack mounted, [°C].
T_measured (float) – An array of values for the measured module temperature, [°C].
T_ambient (float) – An array of values for the ambient temperature, [°C].
poa (float) – An array of values for the plane of array irradiance, [W/m²]
x_0 (float, optional) – Thermal decay constant [cm], [Kempe, PVSC Proceedings 2023]. According to edition 2 of IEC TS 63126 a value of 6.5 cm is recommended.

Returns:

x_eff (float) – Effective module standoff distance. While not the actual physical standoff, this can be thought of as a heat transfer coefficient that produces results that are similar to the modeled singl module temperature with that gap.

References

M. Kempe, et al. Close Roof Mounted System Temperature Estimation for Compliance to IEC TS 63126, PVSC Proceedings 2023