In Mollier diagram, the vertical and horizontal axes are represented by _______.

Explanation:

• Mollier Diagram: Mollier diagram is enthalpy (h) versus entropy (s) plot.

• It consists of a family of constant pressure lines, constant temperature lines and constant volume lines plotted on enthalpy versus entropy coordinates.
• From the T-ds equation:

 Tds = dh – vdp

 In the two-phase region, the constant pressure and constant temperature lines coincide.

\({\left( {\frac{{\partial h}}{{\partial s}}} \right)_p} = T\)

• The slope of an isobar on the h-s coordinates is equal to the absolute temperature. If the temperature remains constant the slope will remain constant.
• If the temperature increases the slope of the isobar will increase.
• For the saturated liquid and saturated vapor i.e. within the dome the temperature and pressure remain constant.

                               Figure: Mollier diagram

• A vertical line in the Mollier diagram represents the isentropic process (s = C).
• A horizontal line in the Mollier diagram represents the isenthalpic process (h = C).
• In Mollier diagram, the vertical and horizontal axes are represented by Enthalpy and Entropy respectively.