Use tables to fill in the blanks in the chart below for wate

Use tables to fill in the blanks in the chart below for water. In some cases you might not have enough data to complete a row (this Is the case for one row!).

Solution

For the 1st Row:

The quality is x = 0.2 which implies that water is in saturated mixture state.

Pressure, P = 200 kPa belongs to saturation temperature T_sat = 120.23°C, for the values over h_f = 504.7 kJ/kg and h_fg = 2201.9 kJ/kg from the table of saturated mixture.

Therefore, enthalpy h can be represented as, h = h_f + xh_fg = 504.7 + 0.2*2201.9 = 945.08 kJ/kg.

For the 2nd Row:

At T = 140°C and h = 1800 kJ/kg the enthalpy value lies between h_f = 589.13 kJ/kg and h_fg = 2144.7 kJ/kg.

Therefore, water is in saturated mixture state and its quality can be represented as:

x = (h - h_f)/h_fg = (1800 - 589.13)/2144.7 = 0.5645

3rd Row:

The quality x = 0 belongs to saturated liquid phase of water.

At pressure P = 950kPa, the saturation temperature is T_sat = 177.69°C and enthalpy h = h_f = 753.02 kJ/kg.

4th Row:

For pressure P = 500 kPa and Temperature T = 80°C data is not sufficient.

5th Row:

For pressure P = 800kPa and enthalpy h = 3162.6 kJ/kg which is greater that h_g, water is in supearheated vapour state.

Therefore the saturation temperature for this case will be T_sat = 350°C and water quality is not needed or applicable.