Report the internal energy of 1 kg of steam at 20 bar when It is superheated, its temperature being 400°C. Solve this numerical 

To calculate the internal energy of 1 kg of steam at 20 bar and 400°C (when superheated), we use steam tables for superheated steam. Here's the process:

### Step 1: Identify given data
- Pressure, \( P = 20 \text{ bar} \)
- Temperature, \( T = 400^\circ \text{C} \)
- Mass, \( m = 1 \text{ kg} \)

### Step 2: Look up specific internal energy
From steam tables, at 20 bar and 400°C, we can extract the **specific internal energy** (\( u \)) of superheated steam.

Using standard superheated steam tables, at:
- \( P = 20 \text{ bar} \)
- \( T = 400^\circ \text{C} \)

The specific internal energy \( u \) is approximately **2950 kJ/kg**.

### Step 3: Calculate total internal energy
Since the mass is 1 kg, the total internal energy \( U \) is the same as the specific internal energy:

\[
U = m \times u = 1 \, \text{kg} \times 2950 \, \text{kJ/kg} = 2950 \, \text{kJ}
\]

Thus, the internal energy of 1 kg of steam at 20 bar and 400°C is **2950 kJ**.

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Would you like more details on the process or steam tables?

Here are 5 related questions for further study:
1. How does internal energy vary with temperature in superheated steam?
2. What is the difference between internal energy and enthalpy in thermodynamics?
3. How can you determine internal energy for steam in a saturated state?
4. What is the specific volume of superheated steam at 20 bar and 400°C?
5. How do you calculate the change in internal energy for a steam expansion process?

**Tip:** Steam tables are essential for thermodynamic calculations, especially for properties like enthalpy, internal energy, and specific volume. Keep them handy for quick reference.

Report the internal energy of 1 kg of steam at 20 bar when it is superheated, its temperature being 400°C. Solve this numerical.

Learn how to calculate the internal energy of 1 kg of superheated steam at 20 bar and 400°C using steam tables. This solution covers key thermodynamic principles, including internal energy and the first law of thermodynamics. Suitable for undergraduate engineering students.

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