ABSTRACT

This work on the construction and fabrication of a mobile deep freezer revolves around the concept of refrigeration. The concept of refrigeration revolves around the reverse Carnot cycle. This is  a cycle involving isentropic expansion (at the throttling valve), isothermal expansion (at the evaporator), isentropic compression (at the compressor) and isothermal compressor ( at the condenser) Compression raises the temperatures of the refrigerant above that of its natural surrounding so that it can give up its heat in a heat exchanger to a heat sink such as air or water (condenser). Expansion lowers the refrigerant temperature below the temperature that is to be produced inside the cooling compartment.

 

TABLE OF CONTENT

Title page
Approval page
Dedication
Acknowledgment
Abstract
Chapter one: Introduction
Chapter Two: Literature Review
Chapter Three:     Design Analysis and Calculations

Chapter Four: Construction Details

Chapter Five: Cost Analysis
Chapter Six: Recommendation

Chapter  Seven: Refrigerants

Chapter Eight: Conclusion
Reference.

CHAPTER ONE

INTRODUCTION

The main objective of this project is to construct and fabricate a deep freezer. The purpose of a deep freezer is to extract as mush heat from the cold body as possible with the expenditure of as little work as possible. In the refrigeration cycle, a substance called the refrigerant is compressed, cooled and then expanded. In expanding the refrigerant absorbs heat its surrounding (the cooling compartment) to provide refrigeration. After the refrigerant absorbs heat from the source, the cycle is repeated.
The second chapter of these write-up  ushers in a precise review of the history and literature of  refrigeration from ancient man to modern day or contemporary  man (i.e modern refrigerating equipment).
Chapter three deals in detail on the methods of calculating refrigeration equipment. Chapter four sequentially gives the overview of the factors, qualities and properties considered in choice decision of the material components (both standard/ranging engineering materials) used for the fabrication and the steps undergone in the assembly of the components to form the refrigerating equipment.
The fifth chapter analysis the material and labour cost incurred in the course of undertaking this project. Chapter six, summmarily is a low down of the maintenance and use instructions to be strictly adhered to in order to make the most effective, economic and efficient use of the refrigerating equipment as well as enable the equipment complete its service life. There is also a provision in this part for the notification of the usual defects observed or experienced during use and the corresponding panacea for them. Included is the reference for future consultancy which helps the student or reader who decides to embark on further research or a fact finding mission on innovations that may add as a filling to this work or to the topic as a whole.
This write-up within its scope is moderate sufficient to the educate the reader on the design and fabrication of a deep freezer.

1.2                          OBJECTIVE OF THE PROJECT
The main objective of this project is to construct and fabricate a mobile deep freezer a consumer device for making ice

1.3                       SIGNIFICANCE OF THE PROJECT

Sea water flake ice machine can make ice directly from the sea water. This ice can be used in fast cooling of fish and other sea products. The fishing industry is the largest user of flake ice machines. Flake ice can lower the temperature of cleaning water and sea products; therefore it resists the growth of bacteria and keeps the seafood fresh.
Because of its large contact and less damage with refrigerated materials, it is also applied in vegetable, fruit and meat storing and transporting.
In baking, during the mixing of flour and milk, flake ice can be added to prevent the flour from self-raising.
In most cases of biosynthesis and chemosynthesis, flake ice is used to control the reaction rate and maintain the aliveness. Flake ice is sanitary, clean with rapid temperature reduction effect.
Flake ice is used as the direct source of water in concrete cooling process, more than 80% in weight. Concrete will not crack if has been mixed and poured in constant and low temperature.
In Focusun, flake ice is also used for artificial snowing, so it is widely applied in ski resorts and Entertainment Park.
1.4                                    APPLICATIONS OF THE PROJECT
mobile deep freezer can be used in the cooling process, such as temperature controlling, fish fresh freezing, and beverage bottle freezing. It can be consumed alone and with food or beverages.

 

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