1. The total enthalpy of 15.000kg of steam at 2250.000kPa is 34191.510kJ. Determine the dryness of the steam.

ANS = %

2. Determine the quantity of heat required, to raise 11.100kg of water at 80.000 degrees Celsius, to saturated steam at 2250.000kPa and 71.400% dry.
ANS = kJ

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 solve these problems, you can use the properties of saturated steam and its related formulas. Here's how you can approach each problem:

1. Calculate the dryness of the steam:
In order to determine the dryness of the steam, you need to use the total enthalpy of the given steam and compare it with the enthalpy of the corresponding saturated steam at the same pressure.

First, locate the given pressure of 2250.000 kPa on your saturated steam properties chart. Find the enthalpy value associated with this pressure (Hs). Then, substitute the given total enthalpy (H) into the following formula:

% dryness = (H - Hf) / (Hs - Hf) * 100

Here, Hf represents the enthalpy of the compressed liquid at the given pressure. Plug in the values, and you should be able to find the % dryness of the steam.

2. Determine the quantity of heat required:
To calculate the quantity of heat required, you need to consider two separate stages: the heating of water from its initial temperature to its boiling point, and then the phase change from water to saturated steam.

First, determine the heat required to raise the temperature of water from 80.000°C to its boiling point. You can use the following formula:

Q1 = m * cp * (T2 - T1)

Q1 represents the quantity of heat required, m is the mass of water (11.100 kg), cp is the specific heat capacity of water (4.186 kJ/kg°C), T1 is the initial temperature (80.000°C), and T2 is the boiling point temperature of water.

Next, calculate the heat required for the phase change from water to saturated steam at 2250.000 kPa and 71.400% dryness. You can use the following formula:

Q2 = m * (Hs - Hf)

Q2 represents the quantity of heat required, Hs is the enthalpy of saturated steam at the given pressure, Hf is the enthalpy of the compressed liquid at the given pressure, and m is the mass of water.

Add the values of Q1 and Q2 to get the total quantity of heat required.

By following these steps and using the values from your saturated steam properties chart, you should be able to find the solutions to both problems.