We were looking various basic concepts during the
discussion of properties of pure substance such as PV diagram, TV diagram and
also triple point phase diagram of pure substance in our previous posts. We have
also seen the basics of quality or dryness fraction of steam in our recent
post.
Today we will see here the concept of superheated
vapour and compressed liquid with the help of this post.
Let us first discuss the concept of superheated vapour
When temperature of vapour is more than the
saturation temperature for a given value of pressure then that vapour will be
termed as superheated vapour. Following figure, displayed here, indicates the
condition of superheated vapour by state 1.
Degree of superheat or simply superheat will be
defined as the difference between the temperature of superheated vapour and
saturation temperature at that pressure value. Degree of superheat or simply
superheat is displayed in the figure and its value will be (T-TSat).
Compressed liquid or subcooled liquid
When temperature of liquid is less than the
saturation temperature for a given value of pressure then liquid will be termed
as compressed liquid. Compressed liquid is also termed as subcooled liquid. Figure
displayed above, indicates the condition of compressed liquid by state 2.
Degree of subcooling will be defined as the
difference between the saturation temperature and actual temperature of liquid
at that pressure value.
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box.
We will see another topic i.e. “Difference between Rankine and Carnot cycle” in our next post in the
category of thermal engineering.
Reference:
Engineering thermodynamics by P. K. Nag
Image courtesy: Google
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