Diesel engines for land and marine work . from which V„ can be determined. After cooling the compressed gas (P„, V„, T„) in theintercooler, its temperature becomes T/ and the volumeis reduced to V„^. From page 11 equation (2) T /P \*t=l T?=(i?) W since in this case y is replaced by n / P \^^ / P \^ °^=(i4:7) ^^ = (i4^) ^^ ^^ T may be taken as 520° F. or 288 C. absolute, hence T„is then known. We may now obtain V,/ since the pressure P„ is constantduring the cooling. y 1 ^ 1 1^=±± (6) V T The temperature T^^ to which the air is cooled will beabout CO or say 32° C. Temperature must of course

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Diesel engines for land and marine work . from which V„ can be determined. After cooling the compressed gas (P„, V„, T„) in theintercooler, its temperature becomes T/ and the volumeis reduced to V„^. From page 11 equation (2) T /P \*t=l T?=(i?) W since in this case y is replaced by n / P \^^ / P \^ °^=(i4:7) ^^ = (i4^) ^^ ^^ T may be taken as 520° F. or 288 C. absolute, hence T„is then known. We may now obtain V,/ since the pressure P„ is constantduring the cooling. y 1 ^ 1 1^=±± (6) V T The temperature T^^ to which the air is cooled will beabout CO or say 32° C. Temperature must of coursebe absolute, T„i = 460 + 90 = 550 V T 1 hence ^ </ = can be determined (7) From the above 4 V 1 /4 VD/— -r ov J)^^y^ (8) which gives the value of the diameter of the stage of 328 DIESEL ENGINES FOK LAND AND MARINE WORK the compressor. The stage diameter is then foundfrom V =-(D2 -Di2) X S4 or D = 4V X Di2 .(9)(10) The calculations may be made clearer by working out an YZZUUZLk ?^^;^ssssss:. ////////

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