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A gas refrigeration system composed of a turbine, a compressor, and two heat exchangers is operating at steady state. Air enters the compressor at 100 kPa, 250 K and exits at 700 kPa. The compressor has an isentropic efficiency of 0.84 and a total power input of 150 kW. The hot heat exchanger transfers 90 kW of energy to the surroundings. The isentropic efficiency of the turbine is 0.89. Determine the rate of energy transfer to the cold heat exchanger, the net power input to the cycle, the mass flow rate in the cycle, and the coefficient of performance of the cycle. Draw a T-s diagram of the process through the cycle. Neglect any changes in kinetic and potential energy, pressure drop through the heat exchangers, and heat transfer from the compressor and turbine. Assume that air behaves as an ideal gas with constant specific heats with cp =1.003 kJ/(kgK).
Lift coefficient (Cl) and lift (L), An airfoil of surface area 1ft squared is tested for lift (L) in a wind tunnel. At an angle of attack of 5 degrees with standard air of density 0.0024 slugs/ft cube at a speed of 100 ft/sec
consider the thin-walled beam section illustrated in the figure below. the beam has a vertical load of v 500 kn acting
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for a certain material failures were reported after 3000 hours at 650 c and 186 hours at 700 c when loaded at 250 mpa.
a piston-cylinder arrangement initially contains water at p 300 psia and t 500of. the piston is moved to a final
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