3. You’ve developed a cold air standard Brayton cycle with a heat input from combustion of 5.0 x 106 Btu/h. Air enters the turbine at 2800°R and exits at 520°R, and the cycle has a compressor-pressure ratio of 12. If the specific heat is evaluated at 520°R, and the turbine and compressor both have isentropic efficiencies of 95%, what is the net power developed by the cycle, in hp?

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk