A PROJECT REPORT ON

“WORKING MODEL OF STIRLING ENGINE”

SUBMITED BY :

VISHAL V. PATEL (110750119018)

HARSHAD B. PATEL (110750119001)

RITESH V. PATEL (110750119024)

PIYUSH J. PATEL (110750119026)

GUIDED BY

UMANG R. PATEL

SHANKERSINH VAGHELA BAPU INSTITUTE OF TECHNOLOGY

CONTENTS

ABSTRACT……………………………………..1

INTRODUCTION………………………………3

LITERATURE REVIEW………………………6

METHODOLOGY……………………………...10

SETUP AND PREPARATION………………....14

CONCLUSION………………………………….24

ABSTRACT

1

ABSTRACTWorldwide attempts are being made to increase

the use of our renewable energy sources as well as to use ourcurrent fossil fuel energy sources more efficiently. Waste heatrecovery forms a substantial part of the latter and is the focusof this project.

The aim of this project was to design, build, andreview of Stirling engine capable of generating power. Thisproject provided a great opportunity to gain experience withmechanical design, manufacturing, and the fundamentals ofStirling engines.

We applied our knowledge of thermodynamicsto the design of the engine, and developed formulas to predictits power output at different temperature differentials.

2

INTRODUCTION

3

HISTORY

The Stirling Engine is one

of the hot air engines. It was

invented by Robert Stirling

(1790-1878) and his brother

James. His father was interesting

in engine and he inherited it. He

became a minister of the church at

Scotland in 1816. At this period,

he found the steam engines are

dangerous for the workers. He

decided to improve the design of

an existing air engine. He hope it

wound be safer alternative.

Robert Stirling

Earlier Stirling Engine 4

DIFFERENT TYPES

Alpha Stirling Engine Gamma Stirling Engine

Beta Stirling Engine

5

LITERATURE REVIEW

6

Author: DaWei Tanga, Zhigang Lia 20 July 2011

Title : Development and test of a Stirling

engine driven by waste gases for the

micro-CHP system.

Remark : The test results confirm the fact that

Stirling engines driven by mid-high

temperature waste gases are able to

achieve a valuable output power for

engineering application.

7

Author: Halit Karabuluta, Hüseyin Serdar 30

October 2007

Title : An experimental study on the development of

b-type Stirling engine for low and moderate

temperature heat sources

Remark : Experimental results presented in this paper

were obtained by testing the engine with air

as working fluid. The hot end of the

displacer cylinder was heated with a LPG

flame and kept about 200 C constant

temperature throughout the testing period.

8

Author: Chin-Hsiang Cheng 6 April 2010

Title Dynamic simulation of a beta-type Stirling engine

with cam-drive mechanism via the combination of

the thermodynamic and dynamic models.

Remark . An extensive parametric study of the effects

of different operating and geometrical

parameters has been performed, and results

regarding the effects of mass moment of

inertia of the flywheel, initial rotational

speed, initial charged pressure, phase angle,

gap size, displacer length, and piston stroke are

investigated.

9

METHODOLOGY

10

STIRLING CYCLE

1-2: constant volume process

2-3: isothermal expansion process

3-4: constant volume process

4-1: isothermal compression process P-V diagram

11

CYCLE EFFICIENCY

Net work, Wnet = Wexp + Wcomp

Net work, Qtotal = Qheat + Qexp

Recovered mechanical energy :

Wnet = Wexp + Wcomp

Wnet = ∫exp PdV + ∫comp PdV (P = nRT / V)

Wnet = ∫exp (nRTmax / V) dV+ ∫comp (nRTmin / V) dV

Wnet = nR (Tmax - Tmin) ln (Vmax / Vmin)

12

Provided heat :

Qexp = ∫exp PdV

Qexp = nR Tmax ln(Vmax / Vmin )

Qheat = nCv (Tmax - Tmin)

Qtotal = nCv (Tmax - Tmin) + nR Tmax ln (Vmax / Vmin)

Cycle efficiency :

η = [R (Tmax - Tmin) ln (Vmax / Vmin)] / [Cv (Tmax - Tmin) + R Tmax ln

(Vmax / Vmin)]

13

SETUP AND PREPARATION

14

ASSEMBLY DRAWING

15: Assembly drawing

FABRICATION DRAWING

16Cylinder fabrication drawing

17

Clamp fabrication drawingCrank wheel

FABRICATION AND ASSEMBLY

Cylinder

Material: Steel

Manufacturing process: Turning in CNC Machine and Facing in lath machine.

Importance : The piston and displace work base on this portion. Another parts are also attached to this part.

18Cool Size Chamber

Fly Wheel :-

Material: Plastic

Importance : Provide

potation energy during no

load stock.

Support Stud

Material: Brass

Importance :

Cylinder, flywheel,

bearing all are

mounting using this

stud provide rigidity.

19Fly Wheel Pivot Mount

PISTON, DISPLACER, GLASS CYLINDER

Material: Aluminum

alloy and Glass

Manufacturing

process : Using CNC

20

Hot Size Chamber

Piston

Displacer

Assembly Section View Disassembly

21Assembly Section View Assembly Section View

3-D MODEL OF STIRLING ENGINE :

223D model of Actual machine

FABRICATION ASSEMBLY:

23Stirling Engine

CONCLUSION

24

The lack of pressurization may also be an opportunity

to improve the engine. Most successful Stirling

engines in our research were pressurized to some

extent. Currently there are leakage issues on the hot

side preventing pressurization, and more may become

apparent as pressure is increased

Several problems remain to be addressed within the

engine. First among them is the overall lack of useful

work output by the engine. Most of the work is being

absorbed by the friction of the crankshaft and piston

linkages, and possibly by inferior bearings. Further

inspection of the compressor block is recommended to

isolate and rectify these problems.

25

REFERENCES

[1] Institute of Engineering Thermo physics, ChineseAcademy of Sciences, No. 11, BeiSiHuanXi Road, Beijing100190, China Beijing ShiYanTianQiang Technology ompany,Beijing 100076, Chin Received 20 July 2011

[2] Department of Mechanical Technology, Faculty ofTechnical Education, Gazi University, 06500 Teknikokullar,Ankara, Turkey,( Received 30 October 2007)

[3] Department of Mechanical Technology, Faculty ofTechnical Education, Gazi University, Besevler, 06500,Ankara, Turkey Received 16 July 2007,

[4]. Wikipedia free encyclopedia. Stirling engine,www.wikipedia.org/wiki/stirlin-engine, (02/18/2009)

[5] stirling cycle efficiencyhttp://www.robertstirlingengine.com/alpha_uk.php

26

THANK YOU

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