Description
ABSTRACT
This report covers all activities candied out to rehabilitate a faulty refrigerator.
First and foremost, we diagnosed the faulty refrigerator using the basic instruments to know the faults.
After which we bought the necessary standard items that caused the fault.
We then started work on it by replacing necessary instruments.
We finally listed it and found out that the objective was fully achieved.
INTRODUCTION
Refrigeration is defined as a process of removing heat from the evaporator in other to make it cooler. More so, it is the branch of science, which deals with the process of reducing and maintaining the temperature of the surroundings.
Generally, however, for a space to be cooler, it must loose heat to another substance. Also for a space or a material to get hotter, it must absorb heat from another substance, thus, heat is the characteristic agent of heating and cooling.
Consequently, for heat to flow there must be a medium or mode for the transmission. This implies from high temperature region to low temperature region.
In refrigeration process, there is always a body employed as the heat absorber or the cooling agent known as refrigerant.
The refrigerant circulates round the evaporating and condensing region. In other to maintain a constant refrigeration process, it does its work by evaporating and condensing.
When it loses the absorbed heat and return to its original liquid or solid state, as the case may be, classified as sensible heat or LATENT HEAT depending on the physical effect on the refrigerants.
Generally, when a mass body absorbs heat, the following physical change takes place.
(1) The mass expand or increase in physical dimensions (as the molecules resonate willing a wider range).
(2) The temperature increase (as molecules gain more internal kinetic energy).
(3) There is a change in phase (as the mass changes from solid to liquid and consequently to gas and vice versa).
TABLE OF CONTENTS
ii Title page
iii Letter of transmittal
iv Release page
v Approval page
vi Dedication
vii Acknowledgement
viii Abstract
TABLE OF CONTENTS
CHAPTER ONE
1.1 Introduction
1.2 The Refrigeration
CHAPTER TWO
2.1 Literature Review
CHAPTER THREE
Component Part of a Guide
3.1 Condenser
3.2 Evaporator
3.3 The Refrigerant
3.4 The Compressor
3.5 Capillary Thermostat and Strainer Other Part
CHAPTER FOUR:
Problems of a Refrigerator and Steps Taken To Rehabilitate It
4.1 Electrical Fault
4.2 Infective Sucking and Discharging
4.3 Open Circuit
4.4 Stoking
4.5 Frequent and Irregular Casing
4.6 Leakage
4.7 Step Taken To Rehabilitate It
CHAPTER FIVE:
Tool and Equipment Used To Rehabilitate a Refrigerator
5.1 Vacuum Pump
5.2 Manifold Gauge
5.3 Charging Valve
5.4 Avometer
5.5 Halge Leak Detector or Alcohol
5.6 Pinches off Tool
5.7 Wrenches
5.8 Sinaging Tool
CHAPTER SIX:
Rehabilitation / Repair Procedures
CHAPTER SEVEN
Economic Analysis
7.1 Material Cost
7.2 Labour Cost
7.3 Total Cost
Conclusion
Reference