Asee peer logo

Compression Of An Ideal Gas With Temperature Dependent Specific Heat Capacities

Download Paper |

Conference

2005 Annual Conference

Location

Portland, Oregon

Publication Date

June 12, 2005

Start Date

June 12, 2005

End Date

June 15, 2005

ISSN

2153-5965

Conference Session

Thermodynamics, Fluid Mechanics

Page Count

13

Page Numbers

10.329.1 - 10.329.13

Permanent URL

https://peer.asee.org/15601

Download Count

3855

Request a correction

Paper Authors

author page

Jr., Donald Mueller

author page

Hosni Abu-Mulaweh

Download Paper |

Abstract

In this paper, a MATLAB computer model of the compression process is presented. The substance being compressed is air which is considered to be an ideal gas with temperature-dependent specific heat capacities. Two approaches are presented to describe the temperature-dependent properties of air. The first approach is to use the ideal gas table data from Ref. [1] with a look-up interpolation scheme. The second approach is to use a curve fit with the NASA Lewis coefficients [2,3]. The computer model developed makes use of a bracketing–bisection algorithm [4] to determine the temperature of the air after compression. This computer code is supplied to the students and discussed after the students have performed a detailed hand calculation. Then, students are required to modify the supplied computer program to solve additional problems. The instructional approach outlined in this paper accomplishes several objectives. First, this computer work serves as a connection between first-year, computer-tools courses and engineering science courses. At Indiana University-Purdue University FortWayne, students take a two-credit hour computer tools course in which they learn MATLAB and then take a two-credit hour programming course in which they learn C/C++ with an engineering emphasis. After completion of the courses, students are often eager to apply their skills to engineering problems. Unfortunately, the opportunities to utilize these skills are limited and students often question why they are required to take the computer classes. More exercises need to be developed to utilize and reinforce the computer skills. Second, the computer implementation allows students to easily vary the thermodynamic parameters so that students can develop a deeper appreciation of the limitations associated with thermodynamic assumptions such as the constant specific heat approximation. Third, the flexibility of the model allows for realistic extensions to the original problem, such as the incorporation of heat loss from the compressor and compressor efficiency. As students modify the provided computer code they develop additional insight and familiarity with thermodynamic equations and concepts. Finally, in later courses, the computer model can be modified to investigate more complicated situations, such as multistage compression with intercooling [5] or the gas turbine cycle [6]. Examples of how these objectives are achieved are provided and discussed.

Mueller, J. D., & Abu-Mulaweh, H. (2005, June), Compression Of An Ideal Gas With Temperature Dependent Specific Heat Capacities Paper presented at 2005 Annual Conference, Portland, Oregon. https://peer.asee.org/15601

ASEE holds the copyright on this document. It may be read by the public free of charge. Authors may archive their work on personal websites or in institutional repositories with the following citation: © 2005 American Society for Engineering Education. Other scholars may excerpt or quote from these materials with the same citation. When excerpting or quoting from Conference Proceedings, authors should, in addition to noting the ASEE copyright, list all the original authors and their institutions and name the host city of the conference. - Last updated April 1, 2015