CBE20260 Lecture Notes - Lecture 5: Specific Volume
8 Feb 2016
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Useful when z is between . 8 and 1. 2 z(tr, pr) (cid:1846)(cid:1870) = (cid:1846) (cid:1846)(cid:1855)(cid:1755)(cid:1755)(cid:1755),(cid:1842)(cid:1870) = (cid:1842) (cid:1842)(cid:1855)(cid:1755)(cid:1755)(cid:1755) Graph line (notes in tutorial notes for homework problem 2) This is why you only need the critical values and omega for using the preos. xls. Hwk problem #4 (problem statement at the end of the explanation) Point of the problem is to help you to navigate pv diagrams. Set = vsvand look at steam table to get pressure. A closed tank contains a vapor-liquid mixture of steam at 45 bar with liquid content 25% by mass: the pressure is changed to 80 bar. What is the temperature: the pressure is changed until the contents become 100% saturated vapor. What is that pressure: with pressure held constant at 45 bar, steam is added to or removed from the tank, as needed, until the contents are 25% liquid by volume.
