In an air-standard brayton cycle the air enters the compressor at 100 kpa and 10°c, with a mass flow rate of 6 kg/s. the pressure leaving the compressor is 10 bar and the turbine inlet temperature is 1100°c. for k=1.4, calculate the compressor, turbine, and network as well as the thermal efficiency of the cycle.

Fluids at rest possess no flow energy. a)- true b)- false

Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.