ME200 - Lecture 27 - 10/30/2010 1 Entropy change for ideal...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 10/30/2010 1 Entropy change for ideal gases ME 200 Thermodynamics I Purdue University , Dr. Tim Pourpoint timothee@purdue.edu Lecture 27 November 1 st , 2010 Lecture Outline Last Few Lectures: From Second Law of Thermodynamics: ME 200 ME 200 2 10/30/2010 2 Lecture Outline Last Lecture: From Second Law of Thermodynamics: ME 200 ME 200 3 This Lecture: Finish Example 26.2 Entropy Change for Ideal Gases Example 26.2 A 50 kg iron block and a 20 kg copper block both initially at 80 C are dropped into a large lake at 15 C. Thermal equilibrium is established after some time as a result of heat transfer between blocks and the lake water. Question: Determine the total change in entropy for this process. ME 200 ME 200 4 10/30/2010 3 Solutions for Example 26.2 Fe 50 kg Fe 50 kg Cu 20 kg Cu 20 kg C Fe = 0.45 kJ/kg K C Cu = 0.39 kJ/kg K 50 kg 80 C 50 kg 20 kg 80 C 20 kg Values at 80 C ME 200 ME 200 5 Solutions for Example 26.2 ME 200 ME 200 6 10/30/2010 4 Solutions for Example 26.2 ME 200 ME 200 7 Ideal Gas: Entropy Change Recall the Gibbs equations (the Tds relationships): v v...
View Full Document

This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue University-West Lafayette.

Page1 / 12

ME200 - Lecture 27 - 10/30/2010 1 Entropy change for ideal...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online