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.

CHAPTER ONE
REFRIGERATION
1.0     INTRODUCTION
The ice cream being sold at the corner stores, the frozen vegetable for dinner, the refreshing water for drinking at the office, water cooler are all dependent on the science of refrigeration. Refrigeration in its specialized forms in a comparative modern development which has been in practice for generations, and its application in controlling environmental condition has made possible some outer space programs and many other scientific and commercial activities as it can be obtained in our houses and on the farm which is considered as an example of a natural refrigeration techniques, the porous clay jugs used in hot desert countries for cooling water, the ice box, for food preservation etc. (Raymond, C.G. (1973).
This write up presents the principle of mechanical refrigeration in vapor compression refrigeration system and it application which gives a clear understanding about the design and operation of the unit.
Refrigeration may be defined as the process of removing heat from a substance. The American society of Engineers defines refrigeration as “the science of producing and maintaining temperature below that of the surrounding atmosphere”. This implies the development of temperature differential rather than the establishment of a given temperature level.
Therefore refrigeration is accomplished by establishing temperatures differentials and evaporation of liquids or combination of both methods for removing heat from a substances in a refrigeration i.e. heat is put into the working substance at lower pressure and temperature and provide the latent heat to make it boil and change to vapor. The vapor is then compressed to a high pressure and temperature at which the superheated gas can be removed and the fluid is turn to liquid. The total cooling effect will be the heat transferred to the working fluid in the evaporator [Raymond, C. G. (1973)].
In any refrigeration process, three basic factors are involved which are: Heat change, pressure control and liquid gas relationship, therefore a working system will require a connection between the condenser and the inlet to the evaporator to complete the circuit.
The purpose of refrigerator deals with the use of refrigerator which is in three forms.
i.    To produce the temperature of a substance (Act of cooling).
ii.     To change a substance from one state to another (as water to ice)
iii.     To maintain substance in a desired temperature state (food preservation or ice storage) [Raymond, C. C. 1973].
All the above purpose is personal comfort in both temperature and hot climatic regions.
1.1     AIM
This project is to educate students of engineering and refrigeration technology lovers on how to achieve maximum cooling during refrigeration by increasing the coefficient of performance (COP)
1.2    OBJECTIVE
    To teach the users of refrigerator the necessity of taking good care of their refrigerator, the danger of using sharp point object which could eventually damaged the evaporator.
    To designing a domestics refrigerator for food preservation.
    To demonstrate practically how the various components of a refrigeration functions.
  To Educates and encourages students who may like to embark on similar project in future, using the available raw materials