A horizontal heated plate at 200 degree Celsius and facing upwards has been placed in still air at 20 degree Celsius. If the plate measures 1.25 m by 1 m, make calculations for the heat loss by natural convection. The convective film coefficient for free convection is given by the following empirical relationh = 0.32 ( ) 0.25 W/m2 K

• A. nWhere is the mean film temperature in degrees kelvin
• B. 6006 W
• C. 5006 W
• D. 4006 W
• E. 3006 W