An axial flow compressor having eight stages and with (50%) reaction design compresses air in the pressure ratio of 4:1. the enters the compressor at (200.C) and flows through it with a constant speed of (90 m/s). The rotating blades of compressor rotate with a mean speed of (180 m/s). isentropic efficiency of compressor may be taken as 82%. Calculate: (i) Work done by the machine (ii) Blades angles. If y=1.4. Cp 1.005 kj/kg K.

An axial flow compressor having eight stages and with (50%) reaction design compresses air in the pressure ratio of 4:1. the enters the compressor at (200.C) and flows through it with a constant speed of (90 m/s). The rotating blades of compressor rotate with a mean speed of (180 m/s). isentropic efficiency of compressor may be taken as 82%. Calculate: (i) Work done by the machine (ii) Blades angles. If y=1.4. Cp 1.005 kj/kg K.

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

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

See similar textbooks

Similar questions

A turbine engine air intake is at pressure and temperature of air drawn 99 kPa and 29 °C respectively. The maximum pressure and temperature during the cycle is 990 kPa and 888 °C respectively. The adaibatic index as 1.4. After claculations, the pressure ratio of the cycle is compressor exit temperature is K, turbine exit temperature is K, net specific work output from the gas turbine engine is in k thermal efficiency_ is % and work ratio of the cycle is to I decimal place.
Ans. 3908 m/min. 14.5 Find the cylinder dimensions of a single-cylinder, double-acting compressor handling 28.32 e/revolution of air from 99.975 kPaa to 723.954 kPaa. Compression and reexpansion are in accordance with PV135 = C. Use the conventional volumetric efficiency; c = 5% and L/D = 1. %3D %3D
Define and derive an expression for stage in case of a steam turbine.
A turbine engine air intake is at pressure and temperature of air drawn 99 kPa and 29 0C respectively. The maximum pressure and temperature during the cycle is 990 kPa and 888 0C respectively. The adaibatic index as 1.4. After claculations, the pressure ratio of the cycle is , compressor exit temperature is K, turbine exit temperature is K, net specific work output from the gas turbine engine is in k, thermal efficiency is % and work ratio of the cycle is to I decimal place
Q3// 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.
A single acting two-stage air compressor deals with 4 m^3/min of air under atmospheric conditions of 1.013 bar and 15°C with aspced of 250r.p.m. The delivery pressure is 80 bar. Assuming complete inlercooling, find the minimum power required by the compressor and the bore and stroke of the compressor. Assume a pistonspeed of 3 m/s, mechanical efficiency of 75 percent, and volumetric efficiency of 80 percent per stage. Assumethe polytropic index of compression in both the stages to be it = 1.25 and neglect clearance.
Define and derive an expression for stage efficiency in case of a steam turbine.
5. 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°
H.w: nitrogen gas flows into a convergent nozzle at 200 kpa,400 K and very low velocity .it flows out of the nozzle at 100 kpa.330 K.ifthe nozzle is insulated find the exit velocity .C, for nitrogen -1.042
Q 2: - A one cylinders Freon (134a) compressor has a Bore and Stroke 5.4 and 4.8 cm respectively. It is speed 1450 rpm volumetric efficiency c.v 100% working fluid reaches expansion valve at 42°C and the temperature %3D of its suction -8°C:- a- Find the mass flow rate of the refrigerant, heat capacity and COPact& COPtho? b- Find the mass flow rate of the refrigerant, heat capacity and COP & COPtho if the clearance factor will be 5%?
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?
a twin cylinder, double acting compressor with a clearance of 6% 25 m/min of air from 120 kpa, 40c to 750 kpa compressor is polytropic with 1.3. find the? (a) work (b) vd (c) the bore and storke for 150 rpm and l/d=12