An inventor claims to have developed a refrigerator that at steady state requires a net power input of 0.7 hp to remove 12,000 btu/h of energy by heat transfer from the freezer compartment at 0 degree f and discharge energy by heat transfer to a kitchen at 70 degree f. evaluate this claim.

Acircular pipe of 30mm outside diameter is placed in an airstream at 30 c and latm pressure. the air moves in cross flow over the pipe at 20 m/s, while the outer surface of the pipe is maintained at 110 c. what is the drag force exerted on the pipe per unit length? what is the rate of heat transfer from the pipe per unit length?