FABRICATION OF DOMESTIC DEEP FREEZER

Department: MECHANICAL ENGINEERING

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Code No: 682519

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ABSTRACT

Table of Content


TABLE OF CONTENT
Title page 
Approval page 
Dedication  
Acknowledgement 
Abstract    
Table of Content
List of Tables  
List of Figure   
CHAPTER ONE: Introduction
1.1 History of Refrigeration   
1.2 Important of Refrigeration Application   
1.3 Freezer 
1.4 Impact of Life Cycle  
1.5 Aims and Objectives        
CHAPTER TWO: LITERATURE REVIEW
2.1 Absorption System of Refrigeration
2.2 Mechanism of Absorption system Process    
2.3 Vapor Compression System 
CHAPTER THREE: ANALYSIS OF REFRIGERATION SYSTEM AND CHOICE OF PROJECT AS BEST
3.0     The Cycle Operation of Vapor Compression    
3.1     Types of Gas Compressor   
3.2     Thermodynamic Analysis of the System   
3.3.1     The Compressor    
3.3.2     The Condenser  
3.3.3     The Evaporator   
3.3.4     Capillary Tube  
3.3.5     Drier   
3.3.6     Lagging Materials   
3.3.7     The Thermostat  
3.3.8     Cooling Fan  
3.3.9     Sheet Metal 
3.3.10     Refrigeration 
CHAPTER FOUR: MATERIAL SELECTION, FABRICATION DETAILS AND ASSEMBLY
4.1    Material Selection, Fabrication Details and
Assembly 
4.2    Assembly and Installation     
4.2.1 Lagging Material and Facing Aluminum Sheet    
4.2.2 Painting    
4.2.3 Charging 
4.2.4 Testing 
4.3 Bill of Engineering Material and Evaluation  
4.4 Trouble Shooting and Service Chart.  
CHAPTER FIVE: RECOMMENDATION AND CONCLUSION
5.1 Recommendation   
5.2 Conclusion  
Reference 


ABSTRACT
Refrigeration is term used to denote the maintenance of a body at a temperature lower than that of its surroundings. The applications of refrigeration are many and varied. In addition to the common applications of refrigerationin the manufacture of ice, in the preservation of foods, in air-conditioning filed, and in the creation of skating rinks, the refrigeration effect is also used in the presentation of blood plasma, in the low-temperature treatment of metals and in the liquefaction of gasses. Each application requires a different temperature for the refrigerated space. This project adopts the basic principle of refrigeration to construct a portable deep freezer The historical development of refrigeration system was discussed along with types of refrigeration system, its impact in our life, how it works and so on. Materials for each component were carefully selected. troubleshooting was included in this report to guide the user on repair and maintenance procedures the total the length of the deep freezer is 99 0mm while the base of the bottom is 750mm, the cabinet cover is 1200mm and his side is 750mm. the special feature are aluminum, thermostat, evaporator pipe, drier cooling fan, polystyrene and TL danfos compressor while the cooling temperature is 125°f

CHAPTER 1


CHAPTER ONE
INTRODUCTION
1.1    HISTORY OF REFRIGERATION
Before the invention of mechanical and thermal refrigeration system, ice houses were used to provide cool storage for most of the year placed near fresh water lakes or packed with snow and ice during the winter, they were once very common (Pauken mike 1999). Natural means are still used to cool, also mountain sides run-off from melting snow is a convenient way to cool drinks, and during the winter, one can keep milk fresh much longer just by keeping it out doors.
In the 11¬¬¬¬th century, the Persian physicist and chemist 1bn Sina (Avicemna ) invented the refrigerated coil, which condense aromatic vapor. This was a break through in distillation technology and he made user of it in his steam distillation process, which requires refrigerated tubing, to produce essential oil.
The first known artificial refrigeration was demonstrated by William Cullen at the university at Glasgow in 1948. Between 1805, when Oliver Evens designed the first refrigeration machine that vapor instead of liquid and in 1902 when Willis Harvilland Carrier demonstrated the air conditioner.
The first practical mechanical regeneration system was invented in 1844 by an American Physician John Corrie to cool sick room in a floride hospital. Shortly afterward, an Australian James Harrison introduces vapor compression refrigeration to the meat packing industries.
A thermally powered ammonia absorption refrigerating system was development by Ferdinard Carre in France in 1859. Carres refrigerating were widely used in industries.
1.2    IMPORTANT OF REFRIGERATION APPLICATION
    There are many importance of refrigeration that are widely used. The importance are listed below;
•    For ice making.
•    For transportation of food above and below freezing point.
•    For chemical and related industries.
•    For medical and surgical aids.
•    Processing of food product and beverage.
•    On reforming and synthetic rubber manufacturing.
•    Freezing of food product.
DISADVANTAGES OF REFRIGERATION.
Many, system still use HCFC (hydrochlorofluro carbon) refrigerants, which contributed to depletion of earth ozone layer in countries adhering to the mensal protocol.
•    HCFC are due to be phased out and are largely being replaced by ozone friendly HCF (Hydro Flurocarbon).
•    System, using HCF refrigerating tend to be slightly less efficiently than using HCFC.
1.3    FREEZER
    Freezer units are used in households and in industry most freezer operate around (-180c) 0OF. Domestic freezer can be included as a separate compartment in a refrigerator, or can be a separate appliance. Freezer are generally upright units resembling refrigerators, or chests resembling upright units laid on their back many upright modern freezer come with an ice dispenser built into their door. Commercial fridge and freezer unit which go by many other names were in use of almost 40 years prior to the common home models. They used toxic gas systems, which occasionally lacked making them unsafe for home use. Practical household refrigerators were introduced in 1915 and gained under acceptance in the limited stated in the 1930s as prices fell and non-toxic, non flammable synthesis refrigerants such as Freon 0-R-12 were introduced. It is notable that while 60% of household in the US (United States) owned refrigerator by the 1930s, it was not until 40years later, i.e. 1970 that the refrigerator achieved a smaller level or penetrative in the United Kingdom.

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