Question:-
The figure given above depicts saturation dome for water on the temperature-entropy plane. What is the temperature difference T shown on a typical isobar line known as ?

Option (A)
Degree of wet bulb depression
Option (B)
Degree of saturation
Option(C)
Degree of sub-cooling
Option(D)
Degree of reheat
Correct Option:
(C)
Question Solution:
The refrigerant, after condensation process is cooled below the saturation temperature before expansion by throttling. Such a process is called undercooling or subcooling of the refrigerant and is generally done along the liquid line.
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