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This paper describes a design-based effort to build an effective closed-system air standard gas power cycle

Extracts from this document...

Introduction

CLOSED-SYSTEM AIR-STANDARD GAS POWER CYCLE BY: Table of content Abstract.....................................................................................1 Problem Statement......................................................................3 Theory and Principles..................................................................4 Air-Standard assumptions..............................................................6 Analysis......................................................................................8 Conclusion.................................................................................10 Abstract In this paper describes a design-based effort to build an effective closed-system air standard gas power cycle. The result was a design challenge in which the students where asked to design a three processes gas power cycle. In our approach to the design we consider different thermodynamics law in order to achieve the ideal closed system gas power cycle. Problem statement Design a closed-system air-standard gas power cycle composed of three processes and having a minimum thermal efficiency of 20 percent. The processes may be isothermal, isobaric, isochoric, isentropic, polytrophic, or pressure as a linear function of volume; however, the Otto, Diesel, Ericsson, and Stirling cycles may not be used. Prepare an engineering report describing your design, showing the system, P-v and T-s diagrams, and sample calculations. Principles and theory An isentropic process is one in which the entropy of the fluid remains constant. ...read more.

Middle

Air-Standard Assumptions In gas power cycles, the working fluid remains a gas throughout the entire cycle. Spark-ignition engines, diesel engines, and conventional gas turbines are familiar examples of devices that operate on gas cycles. In all these engines, energy is provided by burning a fuel within the system boundaries. That is, they are internal combustion engines. Because of this combustion process, the composition of the working fluid changes from air and fuel to combustion products during the course of the cycle. However, considering that air is predominantly nitrogen that undergoes hardly any chemical reactions in the combustion chamber, the working fluid closely resembles air at all times. Even though internal combustion engines operate on a mechanical cycle (the piston returns to its starting position at the end of each revolution), the working fluid does not undergo a complete thermodynamic cycle. It is thrown out of the engine at some point in the cycle (as exhaust gases) ...read more.

Conclusion

Assumptions: 1. The air-standard assumptions are applicable. 2. Kinetic and potential energy changes are negligible. 3. Air is an ideal gas with variable specific heats. Analysis: (b) The properties of air at various states are: 1-2 v constant heat addition from 95 kPa and 17�C to 280 kPa. 2-3 Isentropic expansion to 95 kPa. 3-1 P= constant heat rejection to initial state. P-v Diagram T-s Diagram Properties: The properties of air are given in Table A-17. Calculations Conclusion A cycle during which a net amount of work is produced is called a power cycle, and power cycle during which are working fluid remains gas throughout is called a gas power cycle. The actual gas cycle are rather complex. The approximations used to simplify the analysis are known as the air-standard assumptions. Under these assumptions, all the processes are assumed to be internally reversible; the working fluid is assumed to be air, which behaves as an ideal gas; and the combustion and exhaust process are replaced by heat-addition and heat-rejection processes, respectively. ?? ?? ?? ?? ...read more.

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