A grain dryer consists of a long semicircular duct of radius R= 1 m. One-half of the base surface consists of an electrically heated plate of emissivity &p = 0.8, while the other half supports the grain to be dried, which has an emissivity of g= 0.9. In a batch drying process, the temperature of the grain is Tg= 330 K, and 1500 W/m of energy must be supplied to the grain (per meter of oven length). What is the required temperature of the heater plate? Refractory oven wall Heater Grain plate