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Fig. 4. Exemplary diurnal curve of power (Q) applied to the gauge heater by the open-loop algorithm on a day with clear skies. The divergence of Q from irradiance (R_s) at either end of daylight hours reflects the start time of the controller at 60 min before the computed value for sunrise and the stop time of the controller at 60 min after the computed value for sunset. Nighttime Q was held constant at 0.2 W (horizontal reference line).

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