Objective 02: Specific Enthalpy, Dryness Fraction, Specific Heat, and Specific Volume

Question 1

h_f

Answer 1

The specific enthalpy of saturated water at given pressures and/or saturation temperatures

Question 2

h_g

Answer 2

The specific enthalpy of dry, saturated steam at given pressures and/or saturation temperatures

Question 3

h_fg

Answer 3

The specific enthalpy of evaporation, i.e. the increase in enthalpy required to convert the water (at h_f condition) into steam (at h_g condition)

Question 4

What is another term to denote Dryness Fraction?

Answer 4

Steam Quality

Question 5

Is the specific heat constant at all conditions?

Answer 5

No, it varies with pressure and temperature

Question 6

During what thermodynamic process is specific heat meaningless?

Answer 6

Phase change

Question 7

Specific Volume

Answer 7

The volume occupied by a unit mass of the substance

Question 8

How does the volume of saturated gas generally compare to the volume of saturated water under the same conditions?

Answer 8

The saturated gas has a significantly higher volume

Question 9

At what pressure is the specific volume of water and gas equal?

Answer 9

Critical Pressure