An air-standard cycle consists of the following processes: (i) isentropic compression from 15°C, 1.01 bar through a compression ratio of 5:1. (ii) heat addition at constant volume of 2600 kJ/kg. (iii) reversible adiabatic expansion to the initial volume. (iv) heat rejection isochorically. For air take R = 0.287 kJ/(kg·K) and Cp = 1.005 kJ/(kg·K). Sketch the cycle on P-v and T-s diagrams, and calculate its ideal efficiency, mean effective pressure and peak pres- sure. Take the start of isentropic compression as state point 1. Now the cycle above is modified in two ways so the heat is added, i.e., (a) isobarically, and (b) half isochorically and half isobarically. Take the start of isentropic compression in both the cases as state point 1. Compression ratio is increased so as to follow the same peak pressure as before. Now sketch these two cycles on both P-v and T-s diagrams, and calculate their ideal efficiencies and mean ef- fective pressures. The values of R and cp remain the same.

An air-standard cycle consists of the following processes: (i) isentropic compression from 15°C, 1.01 bar through a compression ratio of 5:1. (ii) heat addition at constant volume of 2600 kJ/kg. (iii) reversible adiabatic expansion to the initial volume. (iv) heat rejection isochorically. For air take R = 0.287 kJ/(kg·K) and Cp = 1.005 kJ/(kg·K). Sketch the cycle on P-v and T-s diagrams, and calculate its ideal efficiency, mean effective pressure and peak pres- sure. Take the start of isentropic compression as state point 1. Now the cycle above is modified in two ways so the heat is added, i.e., (a) isobarically, and (b) half isochorically and half isobarically. Take the start of isentropic compression in both the cases as state point 1. Compression ratio is increased so as to follow the same peak pressure as before. Now sketch these two cycles on both P-v and T-s diagrams, and calculate their ideal efficiencies and mean ef- fective pressures. The values of R and cp remain the same.

Elements Of Electromagnetics

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ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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IC engines

The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical energy (work done). Generally, the engines classify into two groups which are internal combustion type and external combustion type, and further, these two types can be classified into two types that are reciprocating and rotary engines.

Question

An air-standard cycle consists of the following processes:
isentropic compression from 15°C, 1.01 bar through a compression ratio of 5:1.
(ii) heat addition at constant volume of 2600 kJ/kg.
(ii) reversible adiabatic expansion to the initial volume.
(iv) heat rejection isochorically.
(i)
For air take R = 0.287 kJ/(kg·K) and Cp = 1.005 kJ/(kg·K). Sketch the cycle on P-v and
T-s diagrams, and calculate its ideal efficiency, mean effective pressure and peak pres-
sure. Take the start of isentropic compression as state point 1.
Now the cycle above is modified in two ways so the heat is added, i.e.,
(a) isobarically, and
(b)
half isochorically and half isobarically.
Take the start of isentropic compression in both the cases as state point 1. Compression
ratio is increased so as to follow the same peak pressure as before. Now sketch these two
cycles on both P-v and T-s diagrams, and calculate their ideal efficiencies and mean ef-
fective pressures. The values of R and cp remain the same.

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