Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . at the temperature of the exhaust. HEAT AND EFFICIENCY OF CYCLE The heats added on the different lines are: M(i! - q0) on 4-1 (1) 0 on 1-2M(i2 - qo) on 2-3 (2) 0 on 3-4, since M = 0 (Note.—q0 is used rather than qf2 because 0 is used to referto the datum in all cases.) ..AW = Q1-Q2 = MKt! - q0) - (i2 -q0)] = ilffa - i2 )(3) It is to be remembered that i\ and i2 are the heat contents attwo points on the same adiabatic and hence they are found inthe same entropy column or line. Q1 = M[n - q0
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . at the temperature of the exhaust. HEAT AND EFFICIENCY OF CYCLE The heats added on the different lines are: M(i! - q0) on 4-1 (1) 0 on 1-2M(i2 - qo) on 2-3 (2) 0 on 3-4, since M = 0 (Note.—q0 is used rather than qf2 because 0 is used to referto the datum in all cases.) ..AW = Q1-Q2 = MKt! - q0) - (i2 -q0)] = ilffa - i2 )(3) It is to be remembered that i\ and i2 are the heat contents attwo points on the same adiabatic and hence they are found inthe same entropy column or line. Q1 = M[n - q0] Theoretical eff. = r?3 = r (5) ii- q0 w This is sometimes called the Rankine efficiency. In some texts the work of pumping the water into the boilerfrom 4 to 1 is considered giving net work ii — i2 — A(p! - p2)v 172 HEAT ENGINEERING The last term is small. It really does not belong to the enginebeing one of the charges against the boiler. 7\- T0 Now, the Carnot eff. = 771 = m T, m If M pounds of steam are required per horse-power hour, thework = 2546 and the heat is M(ix - q0). 2546 lb.
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