a) Consider a 0.6mX0.6m thin square horizontal plate in a room at 30C. The plate is maintained at temperature of 118C. If the heat transfer is only happening in the lower and upper sides of the plate, determine the total rate of heat transfer. (Neglect the vertical sides of the plate as it is very thin plate and assume air to be ideal gas) (4) b) If instead of a square plate, a polished copper pan with a circular shape (diameter of 0.3m ) is placed on top of an electric heater. The electric heater provides constant heating to maintain it at the same temperature of 118C. Water is placed on top of it and is boiling inside it. Calculate the evaporation rate. (4) c) Estimate the critical heat flux. (2)