1. The working substance for a Carnot cycle is 8 lb of air. The volume at...

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1. The working substance for a Carnot cycle is 8 lb of air. The volume at the beginning of isothermal expansion is 9 cu ft and the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90°F. Find (a) Qa, (b) Q, (c) V3, (d) p3, (e) V4, (f) p4, (g) Pm, (h) the ratio of expansion during the isentropic process, and (i) the overall ratio of compression. Ans. (a) 346.4 Btu; (b) -209.1 Btu; (c) 63.57 cu ft; (d) 25.64 psia; (e) 31.79 cu ft; (f) 51.28 psia; (g) 13.59 psia; (h) 3.53; (i) 7.06 1. The working substance for a Carnot cycle is 8 lb of air. The volume at the beginning of isothermal expansion is 9 cu ft and the pressure is 300 psia. The ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90°F. Find (a) Qa, (b) Q, (c) V3, (d) p3, (e) V4, (f) p4, (g) Pm, (h) the ratio of expansion during the isentropic process, and (i) the overall ratio of compression. Ans. (a) 346.4 Btu; (b) -209.1 Btu; (c) 63.57 cu ft; (d) 25.64 psia; (e) 31.79 cu ft; (f) 51.28 psia; (g) 13.59 psia; (h) 3.53; (i) 7.06