Energy Conversion Weston by Kenneth C. Weston

By Kenneth C. Weston

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3). A measure of the effectiveness of an energy conversion device is its thermal efficiency, which is defined as the ratio of the cycle net work to the heat supplied from external sources. 5) In accordance with the Second Law of Thermodynamics, the Rankine cycle efficiency must be less than the efficiency of a Carnot engine operating between the same temperature extremes. As with the Carnot-cycle efficiency, Rankine-cycle efficiency improves when the average heat-addition temperature increases and the heatrejection temperature decreases.

Carnot’s great work also described the cycle that today bears his name and provides the theoretical limit for efficiency of heat engine cycles that operate between two given temperature levels: the Carnot cycle. 6. All of the heat transferred to the working fluid is supplied isothermally at the high temperature TH = T3, and all heat rejected is transferred from the working medium at the low temperature TL = T1. No heat transfer takes place, of course, in the isentropic processes. 5) and the T-s diagram that the heat added is T3(s3 - s2 ), the heat rejected is T1 (s1 - s4 ), and, by the cyclic integral relation, the net work is T3(s3 - s2 ) + T1 (s1 - s4 ).

4), indicates that neglecting isentropic pump work is equivalent to neglecting the pump enthalpy rise. 2) are almost equal. Thus we take h4 = h3 as a convenient approximation. 1 Btu/lbm. 37 Btu/lbm. 94%). 4294 = 7946 Btu/kW-hr. 52%), based on a source temperature of T1 and a sink temperature of T3. 7736 Here v and l indicate saturated vapor and liquid states, respectively, at pressure p2. Note that the quality could also have been obtained from the Mollier chart for steam as 1 - M, where M is the steam moisture fraction at entropy s2 and pressure p2.

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