D^VIS. — A PQ PLANE FOR THERMODYNAMIC CYCLIC ANALYSIS. 051 



first question involves simply a comparison of the cycles thus selected. 

 These are distributed in the V T area as is indicated iu Table 3, and their 

 properties are summarized in Tables 4 and 5. The highest efficiency is 

 that of a cycle of the Brayton type, but it is a null cycle and any attempt 

 to approach it for the sake of high efficiencies is at the cost of a high 

 compression ratio and a very small value for W. If this cycle be left 

 out of account, the best of those remaining, from every point of view, is 



p 



35 



30 



25 



400 



450 SCO 



Q in BTU 



Figure 17. 

 Tijiye C. Efficiency. For regenerative cycles. These curves, like those of Fig- 

 ure 14, converge toward Q — (i,P — \. The line P = 1 corresponds to E = 1.00. 

 (Cf. Figures 6 and 11.) 



TABLE 4. The Efficiency Cycles. 



