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WHAT IS SUPERHEAT AND SUBCOOLING IN THERMODYNAMICS?

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.

Do you have any suggestions? Please write in comment 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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