Thermodyamics: calculation of diesel cycle efficiency using EES software
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Transcript of Thermodyamics: 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.
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.
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.
ADVANTAGES AND DISADVANTAGES ADVANTAGES There is no knocking
in the diesel engine. Higher efficiency. Less expensive
DISADVANTAGES Pollution Heavy Initial high cost