0

Full Content is available to subscribers

Subscribe/Learn More  >

On the Sign Convention in Thermodynamics: An Asset or an Evil?

[+] Author Affiliations
A. Özer Arnas, Daisie D. Boettner

United States Military Academy, West Point, NY

Margaret B. Bailey

Rochester Institute of Technology, Rochester, NY

Paper No. IMECE2003-41048, pp. 151-161; 11 pages
doi:10.1115/IMECE2003-41048
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Advanced Energy Systems
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Advanced Energy Systems Division
  • ISBN: 0-7918-3708-4 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

In thermodynamics the sign convention normally used is energy added to a system in the form of heat is taken as positive and that added in the form of work is taken as negative – HIP to WIN (heat in positive – work in negative). This is a common sign convention although some texts specify that all forms of energy added to a system as heat or work are positive. However, regardless of the sign convention adopted for heat and work interactions, later in the same text the specified convention is abandoned in favor of magnitudes or absolute values. This occurs particularly in relation to cycle analyses in which the absolute value is used for energy transfers. Generally for reversible cycles there is no proof as to why the ratio of energy added/rejected via heat transfer equals the ratio of the absolute temperatures of the thermal reservoirs. To promote sign convention consistency, this paper develops the appropriate relationship between energy transfers and thermal reservoir temperatures for reversible cycles and applies the result to power producing and power consuming engineering devices.

Copyright © 2003 by ASME
Topics: Thermodynamics

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In