A three stage, single acting, reciprocating air compressor has similar operating parameters to that in part a). The low pressure cylinder has a 450mm bore and 300mm stroke. The clearance volume of the low pressure cylinder is 5% of the swept volume. Intake pressure and temperature are 1 bar and 18°C, respectively. The final delivery pressure is 15bar. Intermediate pressures are ideal and inter-cooling is perfect. The compression and expansion index can be taken as 1.3 throughout. Determine, i) The intermediate pressures; ii) The effective swept volume of the low pressure cylinder; The temperature and volume of air delivered at 15bar; iii)

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Gas Compressors 14.5 Find the cylinder dimension of a single-cylin der, double acting compressor handling 28.32 Its/revolution of air from 99.975 Kpaa to 723.954 kPaa. Compression and reexpansion are in accordance with p35 = C. Use the conventional volumetric efficiency; c = 5% and L/D =1. Ans. 26.77 x 26.77cm

12.5 A single-acting compressor is required to deliver air at 70 bar from an induction pressure of 1 bar, at the rate of 2.4 m³/min measured at free air conditions of 1.013 bar and 15°C. The compression is carried out in two stages with an ideal intermediate pressure and complete intercooling. The clearance volume is 3% of the swept volume in each cylinder and the compressor speed is 750 rev/min. The index of compression and re-expansion is 1.25 for both cylinders and the temperature at the end of the induction stroke in each cylinder is 32°C. The mechanical efficiency of the compressor is 85%. Calculate: (i) the indicated power required; (ii) the saving in power over single-stage compression between the same pressures; (iii) the swept volume of each cylinder; (iv) the required power output of the drive motor. 0306 30.000474 m3. 26 75 kW)

(a) What would be the necessary bore and stroke of a single acting four- cylinder, 350 rpm ammonia compressor working on simple saturation cycle between 35°C condenser and -15°C evaporator temperatures and developing 15 tons refrigeration. Given for the compressor: Ratio of stroke to bore = 1 Volumetric efficiency = 0.7 (b) If the index of compression is 1.15, find the error introduced in calculat- ing the work of compression by assuming the process to be isentropic. Also, find the heat rejected to the compressor-jacket cooling water.

13. The pressures on the compression curve of a diesel engine are at th stroke 1.4 bar and at th stroke 14 bar. Estimate the compression ratio. Calculate the air standard efficiency of the engine if the cut-off occurs at tth of the stroke. (Ans. 18.54 ; 63.7%)

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

Question 3.) An engine has an inlet stagnation condition of 300 bar and 4000 kelvin. Methane and liquid oxygen make up the products of combustion and have a specific heat ratio k = 1.14 and a gas constant R = 383 J / kg-k. The nozzle has an exit to throat area ratio of Ae / Ath = 34.34 and has an exit diameter of 1.3 meters. Calculate the following: (d) For launch at sea level Pb = 101.325 kilopascals, is the nozzle over, under, or perfectly expanded? (e) Is the nozzle flow choked? (f) Exit temperature

Please solve Sub parts A,B,C im needed max in 60 minutes thank u, im very needed the solve 1) Air enters the compressor from a Brayton cycle at a pressure of 100 kPa, temperature27oC and a volumetric flow rate of 1A m3/s. If the turbine inlet temperature is 11ACoC and the ratiopressure (B, 1A)*. If the Compressor Efficiency is 8A% and the turbine efficiency is 9B%. Define : A. From the simulation results, show the p-v or T-s diagram of each case study on B. Complete Compressor Power (kW), Turbine Power (kW), Net Work (kW), Heat In(kW), Net Heat (kW), Back work ratio, Thermal Efficiency (% No  Description Pressure ratio=B Ratiopressure=1A 1  Compressor Work (kW)     2  Turbine Work (kW)     3  Net Work (kW)      4  Heat In (kW)     5  Net Heat (kW)     6  Back Work ratio      7  Thermal Efficiency (%)     Attach below is the data from the cyclepad simulation in the form of a cycleproperties (if no answer…