(1)Q??U?WW?Q??U?100?30?70kJ(2)Q1?2?Q2?1??QsurQsur??TdS?600?0.026?15.6kJ?Q2?1??Q1?2?Qsur??100?15.6??115.6kJW2?1?Q1?2??U1?2??115.6?(?30)??85.6kJ(3)系统作功能力损失：?W?W2?1?W1?2?85.6?70?15.6kJ*是否用内能佣计算系统(4)孤立系统作功能力损失?W?To?Sisul?To?Ssur*应注意区分系统作功能力与孤立系统作功能力。作功能力：：Wmax?exu1?exu2
40. 解：（1）
（2）
p2p1T2T1?(?(v1v2v1v2))k
?81.4?18.4;p2?1.84MPa?2.3;T2?685.4Kk?1?80.4 Q2?3?Cv(T3?T2)T3?T2?p3?p2q2?3Cv?685.4?1773685.47800.717?1773K
T3T2?1.84??4.76MPa（3）
?t.v?1?1/? ?t.v?woq1k?1?1?1/(8)0.4?0.565
wo??t.vq1?0.565?780?440.5kJ（4）提高压缩比?
41. 解：
(1)?Sisul??故能实现。4001000?1941500?370.1280??0.4?0.129?1.32?0.79370
(2)Wo?400?194?370.1?223.9(3)?Wo?To?Sisul?280?0.793?222kJ
42. 解：
H1?m1c122?H2?m2c2222?H3?m3c3226?(1.004?473??7?(1.004?T3?c3??3m?1002c322)?1?(1.004?373?)?7?287?T35022)?3RT3m?4d3?32?4d3p32?4?0.64T3
5?0.1?4?1022?2879352?375742?7028T3?1.43T3T3?426K(t3?153C)c3?0.64?426?273m/so
43. 解：
Wt?h2?h1?h2?h3?面积23452Wt?h2??h1?h2??h3?面积2?345?2?
46. 解：
d?mH2O/ma?m?gH2O/m(1?gH2O)?gH2O?d1?d