Page 118 - Mechanical Engineer's Data Handbook
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THERMODYNAMICS AND HEAT TRANSFER 107
3.3.5 Enthalpy-entropy (h-s) diagram
J
Lines of constant pressure, temperature, dryness frac-
tion and specific volume are shown on the diagram.
AB represents an isentropic process, AC a polytropic
process and DE a constant enthalpy process.
Superheat region
S h
and h,, is the superheat. The total enthalpy is,
therefore,
h = hf + h,,+ h,,
3.3.4 Dryness fraction fa* v
The dryness fraction at entropy s is
x=(y) and h=h,+xh,,
The area xh,, is shown.
3.4 Data tables
3.4. I Temperature conversion
Conversion formulae :
"F - 32
OC=-
1.8
'F=('Cx 1.8)+32
