Engineering, 26.07.2019 19:10 oomale
Agas refrigeration cycle with a pressure ratio of 4 uses helium as the working fluid. the temperature of the helium is -3°c at the compressor inlet and 54'c at the turbine inlet. assume isentropic efficiencies of 88 percent for both the turbine and the compressor (given: the properties of helium are cp=5.1926 kj/kg k and k = 1.667.) determine the mass flow rate of the helium for a refrigeration rate of 30 kw. the mass flow rate of the hellum is kg/s? ?
Answers: 3
Engineering, 03.07.2019 14:10
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
Answers: 2
Engineering, 04.07.2019 18:10
Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false
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Engineering, 04.07.2019 18:10
Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.
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Engineering, 04.07.2019 18:10
Burgers vector is generally parallel to the dislocation line. a)-true b)-false
Answers: 2
Agas refrigeration cycle with a pressure ratio of 4 uses helium as the working fluid. the temperatur...
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