Helium gas is throttled steadily from 400 kPa and 60C. Heat is lost from the helium in the amount of 1.75 kJ/kg to the surroundings at 25C and 100 kPa. If the entropy of the helium increases by 0.34 kJ/kg·K in the valve, determine (a) the exit pressure and temperature and (b) the entropy generation during this process.

Helium gas is throttled steadily from 400 kPa and 60C. Heat is lost from the helium in the amount of 1.75 kJ/kg to the surroundings at 25C and 100 kPa. If the entropy of the helium increases by 0.34 kJ/kg·K in the valve, determine (a) the exit pressure and temperature and (b) the entropy generation during this process.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter4: The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 53P: A copper rod of cross-sectional area 5.0 cm2 and length 5.0 m conducts heat from a heat reservoir at...

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Question

Helium gas is throttled steadily from 400 kPa
and 60C. Heat is lost from the helium in the amount of
1.75 kJ/kg to the surroundings at 25C and 100 kPa. If the
entropy of the helium increases by 0.34 kJ/kg·K in the valve,
determine (a) the exit pressure and temperature and (b) the
entropy generation during this process.

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