FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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The piston displacement of a double acting compressor is 0.358 m3/sec, delivers gas from 101. 325 Kpa and300°K to 675 Kpa at the rate of 0.166 m3/sec at 150 rpm. Value of n for compression and expansion is 1.33. Find the compressor percent clearance.
Please read the problem and solve what is asked. Thanks! A two-stage compressor with an ideal intercooler receives 0.5m3/s of Helium at 150kpa and 300K and discharges it at 7500kpa. Find the heat rejected(kw) at the intercooler.
Ans. 27.015 kw
A single reciprocation compressor takes 1m³ of air per minute and 1.013 bar and 15 degree Celsius and delivers at 7 bar. Assuming Adiabatic law(n=1.35) and no clearance.
This same compressor is now driven at 300 rpm, has a stroke bore ration of (1.5:1), it has a mechanical efficiency for the compressor of 85% and motor transmission efficiency of 90%.
Calculate:
Volume per cycle
Cylinder bore diameter
Power to the compressor
Motor power needed
The isothermal power
The isothermal efficiency
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- 2.A steam throttling valve with inlet conditions of 3MPA and 500C is connected to the inlet of the turbine. The turbine has 800kW power output and heat absorbed of 500kw. If the mass flow rate is 1kg/s and the exit temperature of steam is 400C, find the exit turbine pressure. (arrow_forwardQ3// An axial flow compressor, with compression ratio as 5, draws air at 20°C delivers it at 50°C. Assuming 50% degree of reaction, find the velocity of flow if the blade velocity is 100 m/s. Also find the number of stages. Take work factor-0.85, the exit and inlet angles for both the moving and fixed blades are 10° and 40° respectively, c₁=1 kJ/kg.K.arrow_forwardA turbine receives steam at 10 MPa, 6000C and exhaust it at 0.2 MPa. (a) for the actual engine,the brake engine efficiency is 84%; the driven generator efficiency is 93% and the rated output of the generator is 30 MW. Compute the combined work, combined heat rate, and the total throttle flow for the rated power.arrow_forward
- Air enters an automotive supercharger at 100 kPa, 300 K and is compressed to 150 kPa. The efficiency is 70%. What is the required work input per kilogram of air? What is the exit temperature?arrow_forward2. An air compressor is to compress 510m²/hr from 100kpa to 10bar, for an ideal compression with n=1.3, what will be the percent saving in power due to two staging?arrow_forward(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.arrow_forward
- 2A steam throttiing valve with iniet conditions of 2MPa and 400C is connected to the inlet of the turbine. The turbine has 200kW power output and heat abstracted of 100KW. If the mass fiow rate is 1kgis and the exit temperature of steam is 300C, find the exit turbine pressure.arrow_forward3. A single acting reciprocating compressor is needed to compress 100 kg of air per hour from 100 kPa and 25 deg Cintake condition to 900 kPa delivering pressure. The compression is expected to follow PV to the power 1.25 = C. If the compressor has a clearance factor of 4% and it is expected to operate at 300 rpm, what is the required piston displacement?arrow_forwardmass of the air in pistonarrow_forward
- A single stage single acting reciprocating air compressor has 0.25 m x 1.75 m runs in 750 rpm is to deliver 0.20m³ free air per second from 101.3 kPa to 355 kPa. Calculate (a) the volume displacement (b) the volumetric efficiency (c) the isothermal work done, compression is at pV =c (d) the isothermal compressor efficiency if the the indicated power of compressor is 40kWarrow_forward5. A single row impulse turbine receives 3 kg / sec steam with a friction etc amount to 15 KW, determine the blading efficiency and the blade velocity coefficient. The nozzle angle is 16° and the blade exist angle is 17°arrow_forwardIf the mass flow rate for air is 5 Kg/s .and air compressor takes in air at 200 kPa, 290 K and delivers it at 1.2 MPa, 600 K to a constant-pressure cooler, which it exits at 300 K. Take cp= 1.005 find 1- temperature exit for compressor is A- 290 K B- 600 K C - 300 K 2- work specific compressor is A- ( -211.55) B- ( -311.55) C- ( -411.55) 3- Specific heat transfer in the cooler is A- 301.5 B- 310.5 C- 320.5 4- Power the compressor is A- 1575.75 B- 1585.75 C- 1895.75arrow_forward
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