DESIGN AND FABRICATION OF DOMESTIC REFRIGERATOR

ABSTRACT

This paper describes the quick and precise control method for domestic refrigerator. The propose controller is based on the fuzzy logic and neutral network designed maintaining the constant inner temperature (of the refrigerator and improving the refrigerator efficiency. The fuzzy logic controller is used to maintain the inner temperature inspite of the environment variation such as outer temperature change of the volume change of the stored food to the refrigerator a neutral network is used and rained to recognize the user pattern such as the number of the door opening of the refrigerator.

The first ordered approximated mode of the refrigerator is used for the simulation. Through the simulation in the case of the outer temperature change like summer or winter, the proposefuzzy logic controller with a neutral network is show to be more efficient than the conventional (on-off) controller.

TABLE OF CONTENTS

Tile Page                                                                                                     i

Certification                                                                                                         ii

Dedication                                                                                                  iii

Acknowledgement                                                                                      iv

Abstract                                                                                                      v

Table of Contents                                                                                       vi

CHAPTER ONE: INTRODUCTION

1.1     Refrigeration System                                                                        1

1.2     Aim and Objective                                                                                      2

1.3     The Need of Refrigerator                                                                            3

CHAPTER TWO

2.1     Literature Review                                                                              5

2.2     The Air Refrigeration System                                                           5

2.3     Vapour Absorption Refrigeration System                                        7

2.4     Principle of Operation Absorption Refrigeration System                           7

2.5     The Vapour Compression Refrigerator System                                8

2.6     Component Part of Refrigeration System                                         11

CHAPTER THREE:

DESIGN CALCULATION FOR REFRIGERATOR SYSTEM

3.1     Refrigerant Selection                                                                         12

3.2     Determination of the Flow Rate                                                                 13

3.3     Compressor                                                                                                15

3.4     Compressor Discharge Temperature                                                16

3.5     Specific Volume-Compressor Discharge                                           17

3.6     Condenser                                                                                         18

3.7     Evaporation                                                                                               19

3.8     Insulator                                                                                           19

3.9     Capillary Tube                                                                                  20

3.10   Suction Line                                                                                               21

3.11   Heat Balance for the System                                                             21

3.12   Coefficient of Performance (C.O)                                                      22

CHAPTER FOUR

DESCRIPTION OF COMPONENT PARTS AND WORKING PRINCIPLE

4.1     The Compressor                                                                               23

4.2     Condenser                                                                                         25

4.3     Evaporator                                                                                                 29

4.4     Factor Affecting the Vapourization of a Liquid                                30

4.5     Capillary Tube                                                                                  31

4.5     Strainer Drier                                                                                    32

4.7     Thermodynamic Analysis                                                                 33

4.8     Steps in Selecting Refrigerant                                                           33

4.8.1 Classification of Refrigeration                                                                    33

4.8.2 Primary Refrigerant                                                                          34

4.8.3 Secondary Refrigerant                                                                      34

4.8.4  Desirable Properties of a Refrigerant                                                          34

4.8.4.1 Thermodynamic Properties of a Refrigerant                                            35

4.8.4.2 Chemical Properties of a Refrigerant                                                       35

4.8.4.3 Physical Properties of a Refrigerant                                                         35

4.8.4.4 Other Properties of a Refrigerant                                                   36

CHAPTER FIVE: CONCLUSION AND RECOMMENDATION

5.1     Conclusion                                                                                        37

5.2     Recommendation                                                                              38

References                                                                                         39

CHAPTER ONE

INTRODUCTION

1.1     REFRIGERATOR SYSTEM

Refrigeration is the process of removing heat from a substance and transfers it to another. It is also the science of production and maintaining a temperature below that of a surrounding atmosphere. That is, is the act of removing heat from a substance to be cooled Robet (2011).

In any refrigeration system, the maintenance of low temperature requires the continuous removal of heat from the product at low temperature and the discharge of heat at higher temperature.

The pressure surrounding a liquid affects the escape of the molecule. As the temperature increase the molecules acquires kinetic energy (velocity) and escape.

Refrigeration is accomplished through this method. Refrigeration therefore is that branch of engineering which deals with the principle of lowering the temperature of au insulated enclosure by extracting heat and rejecting to the surrounding with the aid of liquid refrigerant Robet (2011).

In chapter one, the report discussed the introduction to refrigeration system. Chapter two analyses the alternativeto refrigeration system, the description of component part and working principle is discussed in chapter three design calculation for a refrigeration system in chapter four, chapter five discussed and explain lip construction and assembly of the component parts. The conclusion

And recommendation is mention in chapter six.

1.2     AIM

This project work is aimed at designing a domestic refrigerator for food preservation.

OBJECTIVE

(1)   It also demonstrates practically how the various components of a refrigeration system function.

(2)   It is meant to educate and encourage students who may like to embark on similar project in future, using the available raw materials.

(3)       This project will help in the aspect of teaching refrigerator the necessity of taking good care of their refrigeration, the danger of using sharp and pointed object in removing product from the evaporator compartment. In this the section, the principle underlying in the different types of refrigeration system was employed in this project work.

The basic types of refrigeration system are:

(1)     Air refrigeration system.

(2)     Vapour absorption refrigeration system

(3)     Vapour compression refrigeration system.

The project design utilized the principle of vapour compression system being the most widely used cycle of refrigeration.

13 THE NEED FOR REFRIGERATOR

Stages of refrigeration review

House ho1d/Domestic Refrigerator: with the achievement or reliable in modem hermetic mechanical refrigeration system of small house - power size, emphasis is now placed on improving the appearance utility and convenience. Some micro —organisms such as bacteria, yeast and mold causes spoilage of food material such as meat, dairy products, eggs, fruits, vegetable etc. at normal temperature these organism become more active, causing decomposition of such food item at high rate depending on the condition and type of food product but if the temperature of these is greatly reduce the activities of these organism is also reduce if not completely render in active. This makes it possible to keep food for a long period of time. It is also use to reduce the temperature of water and soft drink for domestic consumption.

Commercial Purpose: not only is food preserve in our various home today, but commercial preservation of food is one of the most important application of refrigeration. Commercial preservation and transportation of food is also common that we be difficult to do without refrigerated food in America and Britain. The food that appears in the above named countries are produce. packaged, shipped, stored, and preserved by refrigeration.

Transportation: without the different types of modem refrigeration in store, warehouse, aircraft, railway, cars, stock and ships, the storage and the transportation of all types of perishable good would be impossible.

As a result, we are not limited to the engagement of fruits vegetables and other product growth locally at any given time of the year, but we can have food product from the distance lands an4 other part of the country.

Economic Growth: refrigeration has helped the economy of many areas by providing a means preserving their product enrooted to remote area for consumers.

Hospital: Refrigerators are used in the hospitals for the preservation of bone, blood tissue and some drugs that are to be kept under a particular temperature. It is also pay and important roles in the act of keeping dead body in the mortuaries from being decayed.

DESCRIPTION OF COMPONENT PART

Buyers has the right to create dispute within seven (7) days of purchase for 100% refund request when you experience issue with the file received. 

Dispute can only be created when you receive a corrupt file, a wrong file or irregularities in the table of contents and content of the file you received. 

ProjectShelve.com shall either provide the appropriate file within 48hrs or send refund excluding your bank transaction charges. Term and Conditions are applied.

Buyers are expected to confirm that the material you are paying for is available on our website ProjectShelve.com and you have selected the right material, you have also gone through the preliminary pages and it interests you before payment. DO NOT MAKE BANK PAYMENT IF YOUR TOPIC IS NOT ON THE WEBSITE.

In case of payment for a material not available on ProjectShelve.com, the management of ProjectShelve.com has the right to keep your money until you send a topic that is available on our website within 48 hours.

You cannot change topic after receiving material of the topic you ordered and paid for.