Design and Fabrication of Domestic Deep Freezer

ABSTRACT

This project is on the design and fabrication of deep freezer for the preservation of items/products and making the items to cool. The project is able to develop a simple efficient economical and environmental friendly refrigeration system (A freezer) towards better technological advancement in Nigeria. This project modifies the existing refrigeration system with the use of R-600a which is ozone friendly, and non-contaminant like previous refrigerant of the hydrofluoric-carbon, HFC and CFC like R-12, and R22 which has been phased out according tothe general convection at Britain in 1996. The cooling load obtained was 10682KW, and co-efficient of performance be minimized. The material used were mild steel and the inner pipe of the cabinet i.e. evaporator in order to minimize corrosion. For the better improvement of this work, low power consumption of the compressor refrigeration was used so as to maintain the rate of cooling and freezing of large items/products. And the outer dimensions are: length-1245mm, breadth-895mm-0. 895m, Height-906mm-0.96m and the inner dimensions are Iength-1225mm-1.225m; Breadth-895mm-0.895m, Height-886mm- 0.886m.

TABLE OF CONTENTS

Title page                                                                                              i

Certification                                                                                          ii

Dedication                                                                                             iii

Acknowledgement                                                                                 iv

Abstract                                                                                                 v

Table of content                                                                                     vi

CHAPTER ONE: REFRIGERATION

1.0     Introduction                                                                                 1

1.1     Aim                                                                                             3

1.2     Objectives                                                                                    3

CHAPTER TWO:

1.1     Literature Review                                                                        4

CHAPTER THREE

Analysis of refrigeration system and choice of Project as best               5         

3.0 The cycle operation of                                                                     5

3.1 Types of gas compressor                                                                 7

3.2 Thermodynamic Analysis of Tile System                                        8

3.3.1 The Compressor                                                                           10

3.3.2 Tile Condense                                                                               11

3.3.3 The Evaporator                                                                             13

3.3.4 Capillary Tube                                                                              14

3.3.5 Drier                                                                                             15

3.3.6 Lagging Material                                                                           16

3.3.7 Cooling Fan                                                                                  16

3.3.8 Sheet Metal                                                                                   16

3.3.9 Refrigerant                                                                                    16

CHAPTER FOUR:

4.1     Material Selection, Fabrication Details and Assembly                 18

4.2     Assembly and Installation                                                            19

4.2.1  Lagging Material and Facing Aluminum Sheet                           19

4.2.2  Painting                          

4.2.3  Charging                                                                                      20

4.2.4 Testing                                                                                        21

4.3.1 Bill Of Engineering Materials And       Evaluation (Beme)          22

4.4     Troble Shooting and Service Chart                                              23

CHAPTER FIVE: CONCLUSION AND RECOMMENDATION

5.1     Conclusion                                                                                  24

5.2     Recommendation                                                                         24

References