工程热力学第7章水蒸汽

1、气体分子元体积分子间不计相互作用力分子间相互作用力明显气体分子本身有体积（特别是P大时）vRTpRTpv2vabvRTp实际气体的范德瓦尔斯方程修正作用力修正容积RTbvvap2 321vDvCvBRTpv22321mvTcRTbvvap临界压缩因子289338AvTAvTprrrrrcZfAccccRTvpZ kgkjskgmvkgkjhCtMPapccccc/4237. 4,/003147. 0/2095,12.374,115.2230sspft sssppt6 . 07 .1784KtPapAA16.27366.611mqtcqlpl,stttgllglgmmmYmmmX；湿度，干度，三

2、相点临界点饱和点1,XttsstttsCAab液体加热bc d汽化de过热上界线下界线汽固液过热蒸汽饱和蒸汽湿蒸汽饱和液未饱和液h饱和水焓h0温度为t0时的焓s”干饱和水蒸汽熵s饱和水的熵h”饱和水蒸汽焓h饱和水的焓kkgkjCdtCdtCqpTptplss/187. 4,15.2730其中0hhhqlhhhssTl或h压力为p温度为t时水蒸汽的焓h”压力为p温度为ts时水蒸汽的焓tCdtCqttgpttgpgss,t过热度hhq 00hhhhhhhhqqq0,0,0,/001.02.6116112.0,01.000030000hsukgmvPakPapCt0, 0su熵16.273ln186

3、8.40,sttlpTTdTCsssTsspvhuhh;sspft sspft xxxxxxpvhussxssxsxshhxhhxhxhvvxvvxvxv111sgpssgpTTgpgpsgpTTCTsTTCsTdTCsspvhutChttChhs,lnkgmvKTPapAAA300100022. 0,16.273,2 .6110, 0AAsu0/000614.0kgkjvpuhAAAAxxxxsuhv,1111uuxuxuuxussxsxssxshhxhxhhxhvvxvxvvxvxxxx88.1791stMPaphp lgvdpdhTdsTshpTTspvTshvdpdhTds0TspsT

4、TTshpTshshTshspvTshpTTvvspvTshvdpdhTdsTpvvshshshsp则, 0constX kgml1 . 0kgmg7 . 0875.0glgmmmXglmm 和kgmvx/10625.03求得80. 085. 0lgxmmvv1vXvXvXvxkgmXvvx/12143.0875.010625.03kgmvMPapkgmvMPapss/11661.0,7 .1/12368.0,6 .13231MPapX632. 112143. 012368. 011661. 012368. 016 . 1kgmmvvmvkgmX/1 . 0,2 . 0,233,12714.0

5、vvvXMPapCtss551. 12000时，kgkjhXhXhkgkjhkgkjhCtvvXvXvxsXX/5 .23771,/4 .852/4 .27912007865. 012714. 01 . 00时，31999. 012714. 0573. 1573. 1mvmvkgmXmmmmXgggglg计算工质状态变化计算工质状态变化计算热计算热(能能)量交换量交换定压定容0,1212ptppwvvpwhhq21,121212,0ppvwwvpphhuuqvtvv定温绝热121212,112212121212hhssThhqwvpvphhssTwuuqwssTqTTtTTTT 21,2211

6、21210hhwvpvphhuuwqsTss21hhwtttirww,CtMPap0113001?10252tPap?,2twtkkgkjskgkjhCtMPap/1239.7/3.30513001110117 .2675,51.4173608. 7,3027. 1,105hhssPap时21, 0ssXsssds0391.019609.01XYssssX9 .4634 .25873 .30514 .2587) (2122hhwhhXhhtCtMPap500,911MPapir005. 0,85. 02,kgkjhCtMPap/338650091011MPapkkgkjss005. 0,/6592. 6212kgkjh/20