Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . (6) Fig. 70.—T-S diagram ofRankine cycle. Fig. 71.—Rankine cycle with incom-plete expansion. The T-S diagram for this is an aid in studying the is shown in Fig. 70. In this, points 3 and 4 come heat added per pound from 3 to 1 is6-4-3-1-5 = ii - q0 Heat 12 = 0 Heat 23 = 6-3-2-5 = i% - qo Work = 64315-6325 = 3412 = ix - i24-a-l-2 would show the Carnot cycle. If the expansion is not carried to the back pressure line it iscalled incomplete expansion and the cycle using s
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . (6) Fig. 70.—T-S diagram ofRankine cycle. Fig. 71.—Rankine cycle with incom-plete expansion. The T-S diagram for this is an aid in studying the is shown in Fig. 70. In this, points 3 and 4 come heat added per pound from 3 to 1 is6-4-3-1-5 = ii - q0 Heat 12 = 0 Heat 23 = 6-3-2-5 = i% - qo Work = 64315-6325 = 3412 = ix - i24-a-l-2 would show the Carnot cycle. If the expansion is not carried to the back pressure line it iscalled incomplete expansion and the cycle using such is thensometimes spoken of as the Rankine cycle. The best way tostudy this cycle is by dividing it into two parts by the line 2-6,Fig. 71. Area 5126 = M{ix - i2) Area 2346 = M[A(p2 - Ps)v2] AW = 451234 = M[(n - i2) + A(p2 - p3)v2] (7) THE STEAM ENGINE 173 ii - i2 + A (p2 - ps)v2 ,Q. 773 = u - tf (8) 7\- T0 11 ^73 T, 2 771 2546 775 - Af(*x - qo) 773 for the engine cycle is sometimes called the Rankine efficiencyof the cycle or this term is applied to equation (5). In the above equations, i\ an
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