解:
1-2定熵过程,有
?1k?10.4T2?T1()?300?14?862.1K
?2?1kp2?p1()?100?141.4?4023.3kPa
?2q2?3?cV(T3?T2)?1300kJ/kg,q3?4?cp(T4?T3)?1300kJ/kg所以,
q2?3T3?T2??2672.7K,cvq3?4T4?T3??3967.5KcPT32672.7p3?p4?p2??4023.3?12473.1kPaT2862.1又5-1是定容过程,4-5是定熵过程
T5p5T5p5kk?1?,?() T1p1T4p4所以,5T?1616.9K
q2?cv(T5?T1)?0.718?(1616.9?300)?945.5kJ/kgwnet?q1?q2?2600?945.5?1654.5kJ/kgwnet1654.5?t???0.636q12600
10-10
10-13 解 :