Abstract
The effect on air temperature of variations in heater power for a forced convection oven were modelled. The transfer functions for five operating ranges, from 140 °C to 236 °C, were determined experimentally. The oven power control was excited using a pseudo-random binary signal and the resulting effect on the air temperature was measured. From this information, transfer functions in the ARMAX form were determined. It was found that while the denominator coefficients of the system do not vary for different ranges of air temperature, the numerator coefficients of the system do vary significantly.
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