## Step-by-Step Solution ### a) What is being plotted in this table? What is the difference compared to Tables B5 and B6? **Explanation:** Table B7 is typically the **superheated steam table**. - **What is plotted:** It lists the thermodynamic properties (such as enthalpy, entropy, and specific volume) of water vapor (steam) at pressures and temperatures above the saturation temperature (superheated region). - **Difference from Tables B5 and B6:** - **Table B5:** Usually lists properties of **saturated water and steam** as a function of temperature (saturated temperature table). - **Table B6:** Usually lists properties of **saturated water and steam** as a function of pressure (saturated pressure table). - **Table B7:** Gives properties for **superheated steam** (not at saturation, but at higher temperatures for the given pressure). --- ### b) Why do some of the values between .5 bar to 221 bar indicated in a box? **Explanation:** Values in a **box** typically indicate the **saturation point** (where liquid water and vapor coexist in equilibrium) at that pressure. - For each pressure, the boxed value shows the corresponding **saturation temperature** (boiling point) and the properties of steam at that state. - This helps users quickly identify the transition point between subcooled liquid and superheated vapor. --- ### c) What is the saturation temperature at 10 bar? **Solution:** From the steam tables: - At **10 bar (100 kPa)**, the **saturation temperature** (boiling point) is approximately **179.9°C**. --- ### d) What is the degrees of superheat of a steam at 10 bars and 300°C? **Explanation:** - **Degrees of superheat** = Actual temperature – Saturation temperature at the same pressure. - At 10 bar, saturation temperature ≈ **179.9°C**. - Actual temperature = **300°C**. **Calculation:** \[ \text{Degrees of superheat} = 300^\circ C - 179.9^\circ C = 120.1^\circ C \] --- ### e) Why is there no saturation temperature reported for steam at pressure above 221.2 bar? **Explanation:** - **221.2 bar** is the **critical pressure** of water. - Above the critical pressure, water does **not undergo a phase change** between liquid and vapor; there is no distinct boiling point. - Therefore, **no saturation temperature** or two-phase region exists for pressures higher than 221.2 bar. --- ## **Summary Table** | Part | Answer | |------|--------| | a | Table B7 plots properties of superheated steam; B5 and B6 are for saturated states (liquid/vapor) as function of T or P. | | b | Boxed values indicate the saturation point (boiling point) at the given pressure. | | c | Saturation temperature at 10 bar: **179.9°C** | | d | Degrees of superheat at 10 bar, 300°C: **120.1°C** | | e | No saturation temperature above 221.2 bar because it's above the critical point; no phase change occurs. |