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Carnot heat engine lost work

The exergy equation (2.26) enables useful information on the irreversibilities and lost work to be obtained, in comparison with a Carnot cycle operating within the same temperature limits (T ,ax = Ey and T in = To). Note first that if the heat supplied is the same to each of the two cycles (Carnot and IJB), then the work output from the Carnot engine (Wcar) is greater than that of the IJB cycle (Wijg), and the heat rejected from the former is less than that rejected by the latter. [Pg.20]

In any case, after comparing Kelvin s work very favorably with that done by Holtzmann,... he takes (in his 1850 paper) as his starting point the basic problem to which Kelvin had drawn attention what happens to the mechanical effect which is lost when heat flows from a hot to a cold body not by way of a heat engine but by simple conduction He sees that, in fact, the position is more open, there are rather more possibilities, than Kelvin had supposed. On a nearer view - and how much is contained in that modest phrase - the new (Joule) theory is opposed not to Carnot s theory but to the assertion that no heat is expended or lost in a cyclic operation. For it is quite possible that in the production of work both processes take place at the same time . .. a certain portion of heat may be consumed and a further portion transmitted from a hot body to a cold one and both portions may stand in a definite relation to the quantity of work produced. ... [Pg.140]

Thus, we lose 783 kj of useful work for every minute the heat exchanger operates This value represents the internal exergy loss in this process. Said another way, 783 kJ of work is lost because heat is transferred nonreversibly due to the temperature difference. If we could place a Carnot engine between the steam and air, we could generate 783 kj/min of power. [Pg.181]


See other pages where Carnot heat engine lost work is mentioned: [Pg.439]    [Pg.1137]    [Pg.278]    [Pg.806]    [Pg.126]    [Pg.7]    [Pg.260]    [Pg.138]    [Pg.788]    [Pg.816]   
See also in sourсe #XX -- [ Pg.49 ]




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