1. The total enthalpy of 15.000kg of steam at 2250.000kPa is 34191.510kJ. Determine the dryness of the steam.
ANS = %
Not sure where to start. I need a little help please. I do have a chart with the properties of saturated steam. Thank you.
To determine the dryness of the steam, you need to use the total enthalpy and the properties of saturated steam at the given pressure. Here are the steps to solve the problem:
1. Find the specific enthalpy of saturated steam (h_fg) at the given pressure (2250.000 kPa) using the chart you have. This value represents the enthalpy difference between the saturated liquid and saturated vapor states of the steam.
2. Calculate the specific enthalpy of the saturated liquid (h_f) by subtracting the specific enthalpy of saturated steam (h_fg) from the total enthalpy given (34191.510 kJ). This represents the amount of energy needed to heat the liquid to the vaporization point.
3. Determine the specific enthalpy of the actual steam (h_actual) by dividing the total enthalpy given (34191.510 kJ) by the mass of the steam (15.000 kg). This represents the average energy per unit mass of the steam.
4. Calculate the dryness of the steam (x) using the equation:
x = (h_actual - h_f) / h_fg
Now, let's find the values needed from the chart:
- Find the specific enthalpy of saturated steam (h_fg) at 2250.000 kPa.
- Find the specific enthalpy of saturated liquid (h_f) at the same pressure.
Once you have these values, you can proceed with the calculations.