9. Consider a sliding vanes compressor, which does not feature a gradual compression phase. Consider that the machine is used as a motor by feeding it with air at high pressure. Select the correct statement: A □ The working cycle in the motor functioning has the same shape as that in compressor functioning, and is followed clockwise B□ The working cycle in the motor functioning has the same shape as that in compressor functioning, and is followed anti-clockwise C□ The working cycle in the motor functioning has a modified shape with respect to that in compressor functioning, and is followed anti-clockwise D□ The working cycle in the motor functioning has a modified shape with respect to that in compressor functioning, and is followed clockwise

9. Consider a sliding vanes compressor, which does not feature a gradual compression phase. Consider that the machine is used as a motor by feeding it with air at high pressure. Select the correct statement: A □ The working cycle in the motor functioning has the same shape as that in compressor functioning, and is followed clockwise B□ The working cycle in the motor functioning has the same shape as that in compressor functioning, and is followed anti-clockwise C□ The working cycle in the motor functioning has a modified shape with respect to that in compressor functioning, and is followed anti-clockwise D□ The working cycle in the motor functioning has a modified shape with respect to that in compressor functioning, and is followed clockwise

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter23: Compressors

Section: Chapter Questions

Problem 9RQ: Describe the reciprocating compressor piston, rod, crank-shaft, valves, valve plate, head, shaft...

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The following data were obtained from a performance test of a 10 x 9-cm single acting, water jacketed two-stage air compressor: Pressures: Atmospheric, 102 kPaa; leaving first-stage, 634 kPaa; leaving second-stage, 4.20 MPa. Temperatures: Atmospheric, 240C; leaving first-stage, 1080C; entering 2nd stage, 250C; leaving 2nd stage, 1270C Compressor speed, 648 rpm Power input to motor, 5.65 kW Motor and belt efficiency, 81.5% The following are calculated from test data: Air flow rate, 0.387 ??⁄??? Compression exponents: 1st stage 1.15; 2nd Stage, 1.2 Calculate: a) Approximate indicated power b) Power for isothermal compression c) Shaft power d) 1st stage piston displacement e) Actual volumetric efficiency f) Isothermal compression efficiency g) Mechanical efficiency based on the approximate indicated power h) Over-all efficiency of the compressor
Problem 4: Consider the following schematic of a simple turbojet engine model that uses air as its working fluid. With the data given determine (D) the amount of power required by the compressor, and (E) the velocity of the exhaust stream at the exit of the system. Note: The variable rp is the compressor ratio defined to be the pressure of the compressor exit to the pressure of the compressor inlet. Assume that the compressor, turbine, and nozzle are all adiabatic and reversible. The Turbojet Engine 2 P = P; : 100 kPa Burner T,: 300 k 6: 12 : (200 K $/h が FHV = 43 KJ/g- frel ト

Estimate how the following process modifications affect to the efficiency of the gas turbine process, and connect right answers. Increase of the polytropic efficiency of the turbine Choose... Choose... Increases compressor power Decreases the temperature after turbine Increases the temperature after turbine Reduces compressor power Choose... Reheat combustor Compressor intercooling Increase of compressor inlet air temperature + ◆
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PARTS A & B ( Read and Solve carefully) At the beginning of the compression process of an ideal Diesel cycle operating with the compression ratio r = 18.1, the temperature is T1 = 300K and the pressure is P1 = 0.1MPa. The temperature at the end of the combustion process (the highest temperature of the cycle) is T3 = 1800 K. Evaluate the cutoff ratio rc and the heat delivered during the combustion process qin (in kJ per kg of air) using PART (A) - air standard (variable specific heat) PART ( B) - cold-air standard (constant specific heat evaluated at room temperature). which result, (a) or (b), more accurately represents the actual process in a diesel engine??
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Determine thrust and SFC of twin spool (turbofan) engine with fan driven by LPT and compressor by HPT, separate cold and hot nozzles are used given that: 1-Overall pressure ratio: 25 2- Bypass ratio 5 3- Turbine inlet temperature: 1550 K, 4-Air mass flow: 215 kg/s, 5- Fan pressure ratio: 1.65 6- The ambient pressure and temperature are 1 bar and 288 K. 7- Polytropic efficiencies are: = nc = nt = 0.9 8- NN = 0.95, Nm = f = 0.0221 0.99, Apcc = 1.5 bar, ya=1.4, Yg - 1.333, (Note draw a schematic diagram to the engine and mark the stations clearly)
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The displacement volume of an internal combustion engine is 2.15 liters. The processes within each cylinder of the engine are modeled as an air-standard Diesel cycle with a cutoff ratio of 2.5. The state of the air at the beginning of compression is fixed by p1 = 1.6 bar, T1 = 325 Kand V1 = 2.36 liters. If the cycle is executed 2100 times per min, determine: a) the compression ratio, b) the net work per cycle, in kJ, ) the maximum temperature, in K, d) the power developed by the engine, in kW, e) and the thermal efficiency.
13. In the compression stroke of an internal-combustion engine the heat rejected to the cooling water is 45 kJ/kg and the work input is 90 kJ/kg. Calculate the change in internal energy of the working fluid stating whether it is a gain or a loss. [Ans. 45 kJ/kg (gain)]
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