# Home > Machinery > Machine Systems

```
```

**Download**

**138**

times
**Topic under **Machine Systems

**Source:** berrygroup.uchicago.edu

**File size:** **656.62 KB**

**File type:** **pdf**

**Last download on:**
Sat Mar 25, 2017 02:54:23 PM

__Short Desciption__:

Power and efficiency limits for internal combustion engines via methods
of finite-time thermodynamics, I. INTRODUCTION
“In selecting an idealized process one is always faced
with the fact that the simpler the assumptions, the easier
the analysis, but the farther the result from reality” (Ref.
1, p. 23). The more assumptions we make, the farther we
are likely to be from reality. On the other hand, detailed,
realistic models for internal combustion engines are difficult
and expensive to compute and analyze.2 If we are
interested in maximum power output or in maximum efficiency
of internal combustion engines two ways of approaching
the problem are possible. We could incorporate
the major loss terms such as friction loss, heat leak, and
incomplete combustion in a simple model based on airstandard
cycle with rate-dependent loss mechanisms. Then
using optimal control theory we can compute the piston
trajectory which yields maximum power output. This approach
has been realized in Refs. 3 and 4 and it is an
application of the methods of finite-time thermodynamics.
Another approach is to use a more detailed, “realistic”
model and try only to fmd approximate upper limits for
possible performance rather than to determine directly the
optimum trajectory which yields the best performance.
This approach has been realized in Ref. 5 and it is also an
application of the methods of finite-time thermodynamics.

__Summary__:

Theoretical results of this paper may be useful in two
different ways. First, it is more realistic to compare power
and efficiency of real engines to ( 14) than to air-standard cycle efficiency. Second, it may be a stimulus for research
in thefield of constructing highly efficient nonconventional
internal combustion engines with heating systems instead
of cooling systems.

Bookmark or share this info on Google+ and leave comment at below :

```
```

```
```

```
People who downloaded this also viewed in this sites:
```

__GE Generators An Overview__

GEFL3688B. GE Power Generation. GE Generators - An Overview. James J. Gibney, III. GE industrial & Power Systems. Schenectady...__Fundamentals Handbook Thermodynamics and Heat__

DOE-HDBK-1012/2-92. JUNE 1992. DOE FUNDAMENTALS HANDBOOK. THERMODYNAMICS, HEAT TRANSFER,. AND FLUID FLOW. Volume 2 of 3. U.S. Department of Energy....__Conceptual Machine Design and Mechanical Design Handbook__

Faster, better, and cheaper is the name of the game for machine and device designers. Demands for higher performance and increasingly efficient...

```
Leave comment :
```

"internal combustion engine efficiency"

```
Related Free Files
```

```
GE Generators An Overview... - Download:
```

**245** times

Introduction to Control of Machines... - Download: **219** times

Fundamentals Handbook Mechanical Science vol... - Download: **677** times

ENGINE SPEED CONTROL ... - Download: **153** times

Fundamentals Handbook Thermodynamics and... - Download: **258** times

Operation Maintenance and Repair Auxiliary... - Download: **247** times

Basic Machines... - Download: **948** times

Fundamentals Handbook Material Science vol 2... - Download: **312** times

GEARS_for_Mechanical_Engineering... - Download: **520** times

Electric Machines and Drives... - Download: **564** times