Thermodyamics: calculation of diesel cycle efficiency using EES software

THERMODYAMICS PROJECT

CALCULATION OF DIESEL CYCLE EFFICIENCY USING EES SOFTWARE

TABLE OF CONTENTS: ABSTRACT INTRODUCTION PROCEDURE SNAPSHOTS RESULTS ADVANTAGES AND DISADVANTAGES CONCLUSION

ABSTRACT: In this project we will be calculating the

efficiency of DIESEL cycle using EES software. Ideal cycle for a simple diesel engine is

called as diesel cycle. The diesel cycle is a combustion process of a reciprocating internal combustion engine. In it fuel is ignited by heat generated during the compression of air in the combustion chamber into which fuel is injected.

The diesel cycle is represented in the p-V and T-s diagrams.

FORMULA: Efficiency of diesel cycle can be calculated

using the formula:

INTRODUCTION: DIESEL CYCLE: It is a combustion process of reciprocating

internal combustion engine. This cycle consists of four processes. They

are: Process 1-2: isentropic compression. Process 2-3: constant pressure heat addition. Process 3-4: isentropic expansion. Process 4-1: constant volume heat rejection.

INTERNAL VIEW OF A DIESEL ENGINE

P-V AND T-S DIAGRAMS:

PROCEDURE: Air enters a cylinder at point 1 when compression

starts and it ends at point 2. Isentropic compression is considered with no entropy change. Heat addition starts at point 2 and it ends at point 3. At a constant pressure, combustion takes place (fuel is added to the cylinder and the air temperature raises) and/or heat gets added to air. Expansion starts at point 3 and it ends at point 4. Isentropic expansion is considered with no entropy change. Air heat rejection starts at point 4 and it ends at point 1. At a constant volume, air gets cooled and the working fluid temperature decreases. It should be mentioned that air at point 1 enters the compression process again and the cycle is repeated.

SNAPSHOTS:INPUT DATA:

RESULTSOUTPUT DATA:

ADVANTAGES AND DISADVANTAGES ADVANTAGES There is no knocking

in the diesel engine. Higher efficiency. Less expensive

DISADVANTAGES Pollution Heavy Initial high cost

CONCLUSION: The Diesel Cycle efficiency increases with an

increase in the compression ratio and a decrease in the cut off ratio values. Also, the Diesel Cycle power output increases with an increase in the compression ratio and combustion temperature values.