Determine the amount of acres of land necessary to generate 50 MW of solar power at noon in Philadelphia with an array of panels positioned horizontally. Assume that the panels are 21 % efficient and that the solar irradiation at noon is 900 W/m?

9. Consider a circular grill whose diameter is 0.30 m. The bottom grill is covered with hot coal bricks at 1 100 K, while the wire mesh on top of the grill is covered with steaks initially at 5 °C. The distance between the coal bricks and the steaks is 0.20 m. Treating both the steaks and the coal bricks as blackbodies, determine the initial rate of radiation heat transfer from the coal bricks to the steaks. Also, determine the initial rate of radiation heat transfer to the steaks if the side opening of the grill is covered by aluminum foil, which can be approximated as a reradiating surface.

Two circular plates of radii r1= 4 cm and r2 = 2 cm are (9) cm apart. Find view factorF21.

A particular furnace is shaped like a section of a cone. The top surface of the furnace is uniformly heated by a resistance heater. During operation, the top surface is measured to be 800 K and the power supplied to the resistance heater is 1750 W/m². The sidewall of the furnace is perfectly insulated with & = 0.2. If the emissivity of the top and bottom surfaces are ε = 0.5 and ε = 0.7, respectively, determine the temperatures of the sidewall and the bottom surface of the furnace. A₁ A2 A3 →→D₂ = 20 mm D₁ = 40 mm L = 50 mm