Basic Thermo Sample Problem 1

Question

Steam at a temperature of 300°C has a specific volume of 0.15436 m³/kg. What are the pressure, specific internal energy, enthalpy and entropy?

Answer 1

To find the pressure, specific internal energy, enthalpy, and entropy of steam at a temperature of 300°C with a specific volume of 0.15436 m³/kg, you'll need to use steam tables or steam properties equations. Steam properties are typically provided in tables or charts by organizations like ASME or NIST.

I can provide you with approximate values based on steam tables. However, please note that these values are approximate, and for precise engineering calculations, you should consult the specific steam tables or property equations relevant to your application.

Pressure (P): Look up the pressure corresponding to the given temperature and specific volume in the steam tables. For steam at 300°C and a specific volume of 0.15436 m³/kg, you would find the pressure to be approximately 5.8 MPa.

Specific Internal Energy (u): Find the specific internal energy corresponding to the given temperature and specific volume in the steam tables. For steam at 300°C and 0.15436 m³/kg, the specific internal energy is approximately 2510 kJ/kg.

Enthalpy (h): Similarly, find the enthalpy corresponding to the given temperature and specific volume in the steam tables. For steam at 300°C and 0.15436 m³/kg, the enthalpy is approximately 2680 kJ/kg.

Entropy (s): Find the entropy corresponding to the given temperature and specific volume in the steam tables. For steam at 300°C and 0.15436 m³/kg, the entropy is approximately 6.71 kJ/(kg·K).

Again, note that these values are rounded approximations and can vary slightly depending on the specific steam properties table or equation used. For precise engineering calculations, you should refer to the appropriate steam tables or property equations for your application.