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Fabrication Of Domestic Deep Freezer
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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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ABSRACT - [ Total Page(s): 1 ]ABSTRACTRefrigeration 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 o ... Continue reading---
APPENDIX A - [ Total Page(s): 1 ] ... Continue reading---
LIST OF TABLES - [ Total Page(s): 1 ]LIST OF TABLE4.1 Material Selection, Fabrication Details and Assembly 4.3 Bill of Engineering Materials and Evaluation 4.4 Trouble Shooting and Service Chart ... Continue reading---
LIST OF FIGURES - [ Total Page(s): 1 ]LIST OF FIGURERefrigeration Cycle Isometric View of Fabrication of Domestic Deep Freezer Orthographic Projection of Fabrication of Domestic Deep Freezer Explode View of Fabrication of Domestic Deep Freezer ... Continue reading---
TABLE OF CONTENTS - [ Total Page(s): 1 ]TABLE OF CONTENTTitle page Approval page Dedication Acknowledgement Abstract Table of Content List of Tables List of Figure CHAPTER ONE: Introduction1.1 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 REVIEW2.1 Absorption System of Refrigeration 2.2 Mechanism of Absorption system Process 2.3 Vapor Compression System CHAPTER THREE: ... Continue reading---
CHAPTER TWO - [ Total Page(s): 2 ]CHAPTER TWOLITERATURE REVIEW2.1 ABSORPTION SYSTEM OF REFRIGERATION The absorption system is difficult from the compression system. It used heat energy directly instead of mechanical system. It uses heat energy directly instead of mechanical to make change in the deduction necessary to complete as refrigeration cycle. The system may use element as source of heat (Paunken Mike, (1999) ). The system has fewer moving parts and operates relatively quietly. Such systems are used in commerc ... Continue reading---
CHAPTER THREE - [ Total Page(s): 3 ] CHAPTER THREEANALYSIS OF REFRIGERATION SYSTEM AND CHOICE OF PROJECT AS BEST.3.0 THE CYCLE OPERATION OF VAPOR COMPRESSION. The cycle operation of vapor compression is as follow:- The liquid refrigerant (e.g R12) enter the evaporator- As liquid refrigerant and absorbs heat in the evaporator, the vapor is drawn through the suction line to the compressor.- From the compression, the refrigerant is compressed at supper heated temperature and high pressure to the co ... Continue reading---
CHAPTER FOUR - [ Total Page(s): 3 ]CHAPTER FOUR4.2 ASSEMBLY AND INSTALLATION The first stage of the assembly is the laggings materials and its facing the aluminum sheet.4.2.1 LAGGING MATERIAL AND FACING ALUMINUM SHEET The polystyrene is cut to thickness of 25mm. this is used to cover the internal of the cabinet. Then, the laying of evaporators through the polystyrene, one end of the evaporator is welded to the compressor to serve as inlet. The chemical sheet is used to face the polystyrene with the use of gum (e ... Continue reading---
CHAPTER FIVE - [ Total Page(s): 1 ]CHAPTER FIVERECOMMENDATION AND CONCLUSION5.1 RECOMMENDATION- The use of electric voltage regulator (stablizer0 recommended when using the freezer. - It is also recommended that the freezer should be used for domestic purposes.- Preventive maintenance should be carried out as at when due.- The project is unable to modification.- The project is a very good size, it improves students knowledge of thermodynamic engineering therefore it is recommended that this typ ... Continue reading---
REFRENCES - [ Total Page(s): 1 ]REFERENCES 1. Pauken Mike (1999), freezer (www. En.wikipedia.org (2010)).2. Adams Cecil *(2005), important of refrigeration (www. En. Wikipedia. Org, (2010))3. Albert Einsten (1999). Impact on life (www. En. Wikipedia. org).4. Pauken Mike (2001) Thermodynamic analysis (www. En. Wikiopedia. org ).5. Albert Einsten (2001) Refrigerant *(www. En. Wikipedia org ).6. Myers Richard (2003) types of compressor (www. Wikipedia. org). 7. Pauken Mike (1999) ... Continue reading---
