{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture33_Notes_S

Lecture33_Notes_S - Week 12 Lecture 33 Introduction Monday...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Introduction Content Notes Suggested reading: SMITH, J.M. VAN NESS, H.C. and ABBOTT, M.M., Introduction to Chemical Engineering Thermodynamics , 7 th edition, McGraw-Hill Chapter 5 – pp. 159-170; 173-180 Why do we need the 2 nd Law of Thermodynamics? The First Law of Thermodynamics indicates that energy is conserved in a system (or in a process). We can however imagine processes which conserve energy but which never occur in nature. For example, if we put a cup of coffee into contact with a cold air, we observe that the hot object (the coffee) cools down and the cold object (the air) heats up until equilibrium is reached. The transfer of heat goes from the hot object to the cold object. t = 0 t = t equilibrium Based on the First Law, we can imagine a system in which the heat is instead transferred from the cold object to the hot object, and such a system does not violate the first law of thermodynamics. The cold object gets colder and the hot object gets hotter, but energy is conserved. Obviously we don't encounter such a system in nature. Some energy from the cold air will never be transferred back to the coffee to heat it up! t = 0 t = ? To explain this observation and other similar observations, the Second Law of Thermodynamics was proposed in various ways by Clasius, Kelvin, and Carnot.
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern