Page 273 - Schaum's Outline of Theory and Problems of Applied Physics
P. 273
258 THERMODYNAMICS [CHAP. 21
p Q 1
c d
W
e
Q 2
a b
V
Fig. 21-11
21.3. 32 percent
21.4. 63 percent
21.5. 38.2 hp
21.6. 651 kPa
21.7. 375 K
21.8. 0.33 MJ
◦
21.9. 732 C
21.10. 253 F
◦
21.11. A is more efficient than a Carnot refrigerator, and B has the same efficiency, so both are impossible as practical
refrigerators. C is less efficient than a Carnot refrigerator and so might work as claimed.
21.12. In Fig. 21-11 the events that occur during each cycle of the engine are as follows: ab, intake of air; bc, compression
stroke; cd, fuel injection and burning; ce, power stroke; e, exhaust valve opens; ba, exhaust stroke.
21.13. 4.6 J
21.14. 50 kJ
21.15. EER = 3.42(CP)
21.16. 9.43 hp
