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Problem 6.16:
Air is compressed in a steady-state, insulated flow device. The air enters at 1 bar, 25 °C and exits at 5 bar, 200 °C. a) Determine the amount of work needed for this compression. b) Calculate the entropy generation. c) What is the minimum amount of work necessary to compress air from 1 bar, 25 °C to 5 bar? d) What would be the temperature at the exit of the compressor in part (c)? Assume air to be an ideal gas with Cp = 30 J/molK.
Problem 6.17:
A new compressor has just been delivered to your plant. In order to check its performance you order your staff to make a test run using air. Your staff reports to you the following results: air at a flow rate of 50 mol/min was compressed from 1 bar and 25 °C to 10 bar. The temperature at the exit of the compressor was measured and found to be 450 °C. a) What is the power (in kW) consumed by the compressor? b) What is the efficiency of the compressor? Assume air to be an ideal gas with CP = 3.5R.
A standard vapor compression cycle uses tetrafluoroethane as the refrigerant. The refrigerant at the exit of the condenser is saturated liquid at 90 °F; at the exit of the evaporator it is saturated vapor at 0 °F. The cycle is powered by a compres..
For the circuit shown in Figure P2.5.3, develop and execute a PSpice program to obtain the node voltages and the current through each element.
How might this fact be used in gene finding algorithms?
Suppose the volumetric flow rate of the gas leaving the condenser is 20.0m3/h Calculate the rate (kg/h) at which acetone is vaporized in the solvent recovery unit.
Calculate the fraction of water that is condensed from the air, the relative humidity of the air at 100°C, and the ratio m3 outlet air at 100°C/m3 feed air at 90°C.
Find the relationship between voltage across the membrane and the concentration of CaCl2 before equilibrium is reached.
The speed of the rotor rotating magnetic field with respect to the stator rotating magnetic field in r/min.
The estimated cost of the pipes, per unit length is: schedule 40 carbon steel $5, schedule 80 carbon steel $8.30, stainless steel (304) schedule 40 $24.80. Installation and fittings for all the materials adds $16.5 per unit length. The downtime re..
a)Draw and label the flowchart and carry out the degree-of-freedom analysis using balances on atomic species.(b)Determine the molar flow of oxygen supplied to the boiler.
Also find the source voltage that would yield I = -8µA.
With the number of poles decided, find the speed in r/min at which the motor-generator set will operate.
Determine the synchronous speed in revolutions per minute and the useful torque in new ton meters of a 200-hp, 60-Hz, six-pole synchronous motor operating at its rated full load (1 hp ≅ 746 W).
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