英语翻译A further problem associated with steam is that ithas ve

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英语翻译
A further problem associated with steam is that it
has very low vapour pressures at normal condensing
conditions required in vapour power plant rejecting
heat either to a cooling water stream or to the atmosphere.
Thus,at a condensing temperature of 40 ◦C,the
vapour pressure of steam is only 0.074 bar.This means
that the density of the expanded steam is very low
and huge and expensive turbines are required,while
there are problems with maintaining a vacuum in the
condenser.In contrast to this,pentane at 40 ◦C has
a vapour pressure of 1.15 bar.It is therefore far more
dense and,consequently,the expander required for it
will be much smaller and cheaper.

与蒸汽相关联的另一个问题是,它
具有正常凝结非常低的蒸气压力
在蒸汽发电厂拒绝所需的条件
加热或者到一个冷却水的流或大气中.
因此,在40◦C,冷凝温度的
蒸汽的蒸汽压力仅为0.074吧.这意味着
该膨胀的蒸汽的密度非常低
与庞大又昂贵的涡轮机是必需的,而
有问题维持在一个真空
冷凝器.与此相反,戊烷在40◦C具有
1.15巴的蒸汽压力.因此,它是更为
密,因此,需要它在膨胀
会更小,更便宜.

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