A circular ceramic plate that can be modeled as a blackbody is being heated by an electrical heater. The plate is 30 cm in diameter and is situated in a surrounding ambient temperature of 15°C where the natural convection heat transfer coefficient is 12 W/m²ˆ™K. If the efficiency of the electrical heater to transfer heat to the plate is 80%, determine the electric power that the heater needs to keep the surface temperature of the plate at 200°C.

Transcribed Image Text:

Ambient 15°C h= 12 W/m2.K Tsurr = 15°C T; = 200°C Ceramic plate