a) Explain the variation of work per cycle of reciprocating compressors which compress the air in...
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a) Explain the variation of work per cycle of reciprocating compressors which compress the air in a polytrophic process with the variation of expansion index (n) from 1 to 1.4 (Use the pv diagram for comparison). b) Consider a reciprocating compressor with no clearance volume. The temperature and the pressure of start of the compression process is T₁ and pi respectively. After the compression the pressure is increased up to p2. Prove that the work per cycle of the compressor using pV diagram. (compression is according to law pvn= constant, total mass of air at the end of suction is m)  (²1) (mRT) (₂) W = P₁ I. II. (n1) c) A reciprocating air compressor takes in air at 1.013 bar and 25°C and compresses it according to law pv1.3= constant. Then it is delivered to a receiver at a constant pressure of 10 bar. R=0.287 kJ/kg K. Determine: Temperature at the end of compression. Work done per kg of air. a) Prove Bernoulli's equation for the adiabatic process. b) A gas with a velocity of 300 m/s is flowing through a horizontal pipe at section A where pressure is 78 kN/m² absolute and temperature 40 °C. The pipe changes in diameter at section B, at this section the pressure is 117 kN/m² absolute. Find the velocity of the gas in section B if the flow of the gas is adiabatic. (y=1.4) a) Describe the usage of combustion in a thermodynamic perspective by stating realworld applications. b) Calculate the A/F ratio of a sample of dry coal that has the following composition by mass, C= 74%, H=6%, O=13%, N=1.5%, S0.75%, and Ash=4.75%. (molar mass C12 g/mol, H=1 g/mol, O=16 g/mol, S32 g/mol, N=14 g/mol) a) Explain the variation of work per cycle of reciprocating compressors which compress the air in a polytrophic process with the variation of expansion index (n) from 1 to 1.4 (Use the pv diagram for comparison). b) Consider a reciprocating compressor with no clearance volume. The temperature and the pressure of start of the compression process is T₁ and pi respectively. After the compression the pressure is increased up to p2. Prove that the work per cycle of the compressor using pV diagram. (compression is according to law pvn= constant, total mass of air at the end of suction is m)  (²1) (mRT) (₂) W = P₁ I. II. (n1) c) A reciprocating air compressor takes in air at 1.013 bar and 25°C and compresses it according to law pv1.3= constant. Then it is delivered to a receiver at a constant pressure of 10 bar. R=0.287 kJ/kg K. Determine: Temperature at the end of compression. Work done per kg of air. a) Prove Bernoulli's equation for the adiabatic process. b) A gas with a velocity of 300 m/s is flowing through a horizontal pipe at section A where pressure is 78 kN/m² absolute and temperature 40 °C. The pipe changes in diameter at section B, at this section the pressure is 117 kN/m² absolute. Find the velocity of the gas in section B if the flow of the gas is adiabatic. (y=1.4) a) Describe the usage of combustion in a thermodynamic perspective by stating realworld applications. b) Calculate the A/F ratio of a sample of dry coal that has the following composition by mass, C= 74%, H=6%, O=13%, N=1.5%, S0.75%, and Ash=4.75%. (molar mass C12 g/mol, H=1 g/mol, O=16 g/mol, S32 g/mol, N=14 g/mol)
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a For a polytropic process in a reciprocating compressor the work per cycle varies with the polytrop... View the full answer
Related Book For
Fundamentals of Thermodynamics
ISBN: 9780471152323
6th edition
Authors: Richard E. Sonntag, Claus Borgnakke, Gordon J. Van Wylen
Posted Date:
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