To conform with the presentation of test results, when testing in accordance with steady-state method,
the test results shall be presented in the form of a power curve as a function of the temperature difference
between mean fluid and ambient temperature (ϑm – ϑa). It shall be calculated from the power function,
Formula 27, using the value of G = 1000 W/m2 and a diffuse fraction of 15 %, i.e. Gd = 150 W/m2. The
parameter dϑm/dt is set to zero (dϑm/dt = 0).