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2018-10-28View Original

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kuk
Reply #22018-10-28
pestic
Reply #32018-10-28
"user
Reply #42018-10-29
N
Reply #52018-10-30
kuk
Reply #62019-01-31
pestic
Reply #72019-02-11
"
Reply #82019-02-11
需要先搞清概念:每个压力下会有一个饱和温度,反过来每个温度下会有一个饱和压力。但具体某个操作温度对应的压力未必是饱和压力,在操作压力低于饱和压力时,水是蒸汽状态,当操作压力高于饱和压力时,水是液态,所以用泵给水加压和饱和压力并无直接关系。
Reply #92019-02-15
单单讨论水或者蒸汽了,不同的流体饱和压力不一样; 饱和压力只跟水或者蒸汽的 “温度” 有关系;跟泵或者压缩机其他机器加给水或者气体的压力没有关系; 在什么温度下,水或者蒸汽就有相对应的 饱和压力; 在这个温度下,水如果低于饱和压力,就会气化一部分直至全部气化; 在一定温度下,饱和水如果被泵加压,如果温度不变,饱和压力不会变的。实际上温度会有升高,所以水还是饱和水,既然温度升高了,对应的饱和压力也就变了(升高了); 水蒸气在一定温度下,低于饱和压力,就会凝结一部分变成水;被加热后,温度升高,水蒸气就变为过热蒸汽,就不是饱和蒸汽了。 湿空气的有关于湿度问题,另外再说。
Reply #102019-04-28
饱和压力只和介质温度有关,不会因为其他发生变化的。

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