Simple flow works according to the simple Brayton cycle. The air enters the compressor with 80 kPa pressure, 280 K temperature and 55 m3 / h volumetric flow. The pressure ratio in the compressor is 20, the maximum temperature in the cycle is 2100K. As the compressor will have an isentropic efficiency of 93%, a turbine of 96% and a cold air standard.
a) Net power, MW
b) Heat transfer in the boiler, MW
c) Thermal efficiency of the cycle
d) If it is considered to use heat transfer at 2500 K temperature, find the entropy production in the boiler by writing the 2nd law (entropy balance).

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

What is the major difference between thermoplastics and thermosetting plastics from the polymerization structure point of view?

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg. m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?