{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

NotesFirstLawClosedSystem

# NotesFirstLawClosedSystem - Lecture(First law closed...

This preview shows pages 1–3. Sign up to view the full content.

Lecture (First law closed systems) J.C. Ordonez 1 Some notes on the First Law of Thermodynamics for a closed system The first law of thermodynamics is a statement of the conservation of energy. For a closed system we have: W Q E Σ Σ = Let’s discuss in some detail each term of the above equation: Energy Change: : E represents the change in energy experienced by the system. If the system experience a change from state 1 to state 2, we have: 1 2 E E E = In general we can write the energy change of a system as: ( ) other potential kinetic energy ernal int change 1 2 1 2 E ) E ( ) E ( U U E E + + + = 43 42 1 In many cases in thermodynamic analysis the changes in kinetic, potential and other forms of energy storage are negligible compared with the change in internal energy. In those cases, U E 1 2 1 2 U U E E You (the analyst) should decide when the assumption of negligible kinetic and potential energy changes is a valid one.

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

View Full Document
Lecture (First law closed systems) J.C. Ordonez 2 HEAT interactions: Q : represents the net heat interactions. WORK interactions: W : represents the net work interaction. As we mentioned in class, there is a sign convention for the work and heat interactions. We will consider that work done BY the system to be
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• 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.

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

• 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.

Dana University of Pennsylvania ‘17, Course Hero Intern

• 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.

Jill Tulane University ‘16, Course Hero Intern