Chapter Four Energy Transfers.pdf

1 Page
76 Views
Unlock Document

Department
Mechanical Engineering
Course
308800
Professor
Chris Ford
Semester
Spring

Description
Chapter Four: Energy Transfers Monday, 11 November 2013 6:09 PM • Understand definitions of work and heat Definition of Work • Work: Force (F) acting though displacement (s) in the direction of the force; • In thermodynamic systems, work is done by a system if the sole effect on the surroundings could raise a weight • Work out of a system (done by; gas expanding against a piston) is considered positiveand into a system (done on; piston compressing a gas) is considered negative • Work is a form of energy being transferred across the system boundary, this can be flow of electricity Units for Work • Unit for work is joule (J) or kilojoule (kJ) • Power: rate of doing work, • 1 J/s = 1 Watt (W) Work done at the moving boundary of a simplecompressible system • • Therefore, work is considered the integral of PdV, or the area under the curve of a Pressure- Volume graph • As this depends on the path that is undertaken to get from state 1 to state 2, work is said to be a path function or an inexact differential Definition of Heat • Heat (Q): form of energy transferred
More Less

Related notes for 308800

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit