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ABSTRACT

This write up is a detail of the process and formulation of plan for the physical realization of the construction of a mobile refrigerator. It is divided into chapters, which discussed extensively the practical refrigeration cycle with full attention given to design factors, working principle and choice of material  The method used in fabrication, assembly an arriving at knowing the safety requirement were not left out.

NOMENCLATURE

M         =          Means

A         =          Area

S          =          Entropy

V         =          Volume

M         =          Mass flow rate

Q         =          Diameter

G         =          Gravity

D         =          Density      

TA        =          Temperature difference

H         =          Enthalpy

Q         =          Quantity of Heat

R         =          Equivalent Load

L          =          Length

P          =          Pressure

T          =          Temperature

U         =          Internal Energy

R         =          Thermal Conductivity

X         =          Thickness of Material

VS       =          Swept Volume 

H.P      =          Horse Power

G.P      =          Coefficient of Performance.

 

 

 

 

 

 

 

TABLE OF CONTENTS

CHAPTER ONE

1. Introduction                                                                            1
   1. Brief Historical Sketch of                  

Man - Made Cold and Refrigerator                                        2

1. Purpose of Construction                                                                     5
2. Importance and Specification of Project                                6
3. Scope and Limitation                                                              8
4. Statement of Problems                                                                        8

CHAPTER TWO

1. Literature Review (Refrigeration as

Related to Thermodynamic Process)                                      10

1. The Reversed Carnot Cycle                                                    13
2. Modification of the Ideal Cycle                                                         16
3. Condition at the Compressor Inlet                                         17
4. Sub-Cooing of the Condensed Vapour                                  18
5. Definition of Key Terms                                                                     19

CHAPTER THREE

Detailed information needed for the construction

consideration of the principle. Construction details                           24

1. Description of the Units                                                                     25
2. Other Assembly                                                                                  38

CHAPTER FOUR

4.0       Construction/Maintenance Procedure                                                 40                   

CHAPTER FIVE

1. Defrosting                                                                                           43
2. Analysis and Material Cost Value                                          44
3. Recommendation                                                                                45
4. Recommendations for Usage of Units                                               46
5. Conclusion                                                                                          47
6. Common Complaints, Causes and Remedies                         49

References                                                                                          50

 

 

CHAPTER ONE

INTRODUCTION

            Refrigeration has played a vital role in the life of people and has made the standard of living of mankind to be improved. The improvement in the refrigeration is as a result of team work by Engineers, Scientist, Technicians and so on.

            Furthermore, science has provide the foundations on which other new discoveries such as substance and materials are built and these are applicable to refrigeration field by those that manufacture, design, maintain and install refrigeration equipment, through subsequent planned research, development and practical application is becomes useful.

            The application of refrigeration or its principle has no limit and the most obvious and the one known to everybody is its preservative purpose such as food, drinks and other perishable items. Refrigeration is very intimate and this modern society cannot be without it.

 

1. BRIEF HISTORY OF “MAN-MADE’ COLD AND REFRIGERATOR (DEEP FREEZER)       

From history, the knowledge and strong of Ice was dated as far back of 10. Be then the early men know about Ice but the important and its usage as a means of presenting food has not be there. Some thousand years later, the Chinese discovered that Ice improves and maintained the test of food and drinks for some times hence they began to cut Ice during winter period, packed them with straco which they sold during summer period.

The early Egyptian found that water be cooled by placing it in a porous fairs at sundmen. The moisture notice be evaporated by the night breezes  which seeped through the jars causing the water in the porous Jar to be cooler. The great discovery day the Greeks and Romans should not be left out, they brought some from the mountaintops to the conical shaped pits which was lined with stand and branches and then covered with a thatched roof.

As days are passing by, the weather al

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