. Applied thermodynamics for engineers. Fig. 98. Arts. 252, 256.—Lorenz Cycle,Entropy Diagram. ture at g as in Art. 251, and in the manner just described plot the curves gh anddh on the entropy diagram. Fig. 98, Pg, Pi, T^, Td, n and q being given, dg andhh of course appear as vertical straight lines. The efficiency is Sn{n- T,) -s,(T,- Td)sn(n- T,) 253. Reitlinger Cycle. This appears as aicj, Figs. 99 and 100. It is boundedby two isothermals and two like polytropics (isodiabatics). The Carnot is a specialexample of this type of cycle. To plot the entropy diagram, Fig. 100, we assumethe ratio

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. Applied thermodynamics for engineers. Fig. 98. Arts. 252, 256.—Lorenz Cycle,Entropy Diagram. ture at g as in Art. 251, and in the manner just described plot the curves gh anddh on the entropy diagram. Fig. 98, Pg, Pi, T^, Td, n and q being given, dg andhh of course appear as vertical straight lines. The efficiency is Sn{n- T,) -s,(T,- Td)sn(n- T,) 253. Reitlinger Cycle. This appears as aicj, Figs. 99 and 100. It is boundedby two isothermals and two like polytropics (isodiabatics). The Carnot is a specialexample of this type of cycle. To plot the entropy diagram, Fig. 100, we assumethe ratio of pressures or of volumes along ai or cj. Let Va and Vi be given. Then the gain of entropy from a to i is (PaVa loge-^ j -^T. The curves ic and aj are JOULE AIR ENGINE 149 plotted for the given value of the exponent n. This is sometimes called the isodia-batic cycle. Its efficiency is which may be expanded as in Arts. 251,

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