Themo:water entropy from mass, volume, temp

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SUMMARY

The discussion centers on calculating the entropy of a specific region with a temperature of 300°C, a specific volume of 2 m³/kg, and a total volume of 500 m³. The mass (M) is determined to be 250 kg using the equation M = V/sv. Participants highlight the challenge of finding entropy values from steam tables without pressure data. The solution suggests assuming constant specific heat and integrating between the states to find the entropy.

PREREQUISITES
  • Understanding of thermodynamic properties, specifically entropy
  • Familiarity with steam tables and their application
  • Knowledge of specific heat and its role in thermodynamic calculations
  • Basic algebra for manipulating equations related to mass and volume
NEXT STEPS
  • Study how to use steam tables for entropy calculations
  • Learn about the relationship between pressure, temperature, and specific volume in thermodynamics
  • Explore integration techniques for calculating changes in entropy
  • Review the concept of constant specific heat and its implications in thermodynamic processes
USEFUL FOR

This discussion is beneficial for students in thermodynamics, engineers working with steam systems, and anyone involved in calculating entropy in thermal processes.

deadendcustom
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Homework Statement


Find the entropy (s) of the region
Temperature=300°C
Specific Volume(sv)=2 m^3/kg
Volume(V)=500 m^3


Homework Equations



V/(sv)=M
M=250kg

The Attempt at a Solution



Without the pressure I'm unsure how to look up the entropy from the Steam tables so if anyone has any ideas I'd appreciate it.

thanks
 
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Assume constant specific heat between the state at which S = 0 and your state, then integrate.
 

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