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TITLE PAGE
80CM X 70CM X 50CM MOBILE DEEP FREEZER
BY
---
EE/H2013/01430
DEPARTMENT OF ----
SCHOOL OF ---
INSTITUTE OF ---
DECEMBER,2018
APPROVAL PAGE
This is to certify that the research work, 80cm 70cm 50cm mobile deep freezer by ---, Reg. No. EE/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.
By
--- . ---
Supervisor Head of Department.
Signature………………. Signature……………….
……………………………….
---
External Invigilator
DEDICATION
This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my --- for his financial support and moral care towards me.Also to my mentor --- for her academic advice she often gives to me. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen.
ACKNOWLEDGEMENT
The successful completion of this project work could not have been a reality without the encouragement of my --- and other people. My immensely appreciation goes to my humble and able supervisor mr. --- for his kindness in supervising this project.
My warmest gratitude goes to my parents for their moral, spiritual and financial support throughout my study in this institution.
My appreciation goes to some of my lecturers among whom are Mr. ---, and Dr. ---. I also recognize the support of some of the staff of --- among whom are: The General Manager, Deputy General manager, the internal Auditor Mr. --- and the ---. Finally, my appreciation goes to my elder sister ---, my lovely friends mercy ---, ---, --- and many others who were quite helpful.
PROJECT DESCRIPTION: This work "80cm 70cm 50cm mobile deep freezer" research material is a complete and well researched project material strictly for academic purposes, which has been approved by different Lecturers from different higher institutions. We made Preliminary pages, Abstract and Chapter one of "80cm 70cm 50cm mobile deep freezer: visible for everyone, then the complete material on "80cm 70cm 50cm mobile deep freezer" is to be ordered for. Happy viewing!!!
Deepfreeze is a large home appliance that keeps its contents just below the freezing temperature. Freezers are electric and can be plugged into a standard household receptacle. A freezer is used for storing and extending the life of certain foods. There are various freezer capacity sizes on the market. Freezer units are used in households and in industry and commerce. Food stored at or below −18 °C (0 °F) is safe indefinitely. Most household freezers maintain temperatures from −23 to −18 °C (−9 to 0 °F), although some freezer-only units can achieve −34 °C (−29 °F) and lower.
The need for an authentic and reliable report relating to the design and construction of 80cm x 70cm x 50cm mobile deep freezer is inevitable. It should be a top priority of every individual in order to avoid huge expenditure in purchase to foreign ones. Its for this reason that this report is written for the benefit of those who are privilege to design and construct their own deep freezer for used.This report is base on ordinary and advanced level research, in order to aid easy reading and understood for an average person.
This report is divided into chapters, which discussed extensively, the introduction of mobile deep freezer, the introduction of mobile deep freezer, the history the practical refrigeration cycle with full attention given to design factors, working principle and choice of materials. The method use in fabrication, assembly and knowing the safety requirement. Subsequently, advanced information pertaining calculation about the project have been given in certain section of this report which will be beneficial to those interested in the design and construction of 80cm x 70cm x 50cm mobile deep freezer.
TABLE OF CONTENTS
Title Page
Release Page
Signature Page
Approval Page
Dedication
Acknowledgement
Abstract
Table of Contents
Table of Illustration
List of Symbols
CHAPTER ONE
1.0 Introduction
1.1 What Prompted the Project
1.2 Purpose of the Project
1.3 Importance of the Project
1.4 Benefits of the Project
CHAPTER TWO
CHAPTER TWO
2.0 literature review
2.1 review of the study
2.2 refrigerants
2.3 requirements for refrigerants
2.4 identifying refrigerants by number
2.5 halide refrigerants
2.6 grouping and classification of refrigerants
CHAPTER THREE
3.0 Synthesis of Solution
3.1 Theory of Design and Analysis
3.2 Design Calculation
3.3 Determination of Compressor Size
3.4 Coefficient of Performance
CHAPTER FOUR
4.0 Construction Maintenance Procedures
4.1 Description of Materials Selected
4.2 Description of Tools / Equipment Used and Procedures
4.3 Assembly of the Work or Project
4.4 Testing and Evaluation
CHAPTER FIVE
5.0 Costing of the Project
5.1 Conclusion
5.2 Recommendation
5.3 References
CHAPTER ONE
1.0 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 and summary 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.
1.4 WHAT PROMPTED THE PROJECT
We decided to embark on this project because of the deplorable situation we have noticed with some of our refrigeration system and the problem of where to preserve food in the department of the need arise, that we have produce and present this mobile deep freezer for use in the department for those who may wish to preserved their foods while at school before taking their home for consumption to avoid being spoil.
1.5 PURPOSE OF THE PROJECT
The objectives and purpose of this project is to achieve the following VIZ:
- To design and construct portable domestic cooling equipment that would improve on existing design taken into consideration.
- To design and construct a cooling / freezing system that is efficient with little or no complexity in maintenance.
- To design and construct cooling equipment that will be mobile, economical and cost effective that even a common man can afford.
- To produce a working and assembling drawing of the equipment through which further improvement / development can be base on.
- To improve the design and construct portable cooling/freezing equipment with a reduce weight.
1.6 IMPORTANCE OF THE PROJECT
The importance attached to this design is the accomplishment of a fast freezing system without adverse effects on the food tissues, the flavours, freshness and nutrients of food materials. The design intention is based on reduced weight and cost, longer life span, fast freezing techniques, compactness, portability and more so to improve on existing design taking into consideration the Nigeria facto and possibility of expanding and marketability.
1.7 BENEFITS OF THE PROJECT
Food stuffs can then be preserved with the deep freezer for a very longtime to avoid being spoil before usage. The design and fabrication of the mobile deep freezer has broaden our practical knowledge and we can be scifrelical if one may decide to go into production in the near future and acts as a consultant. We can equally work efficiently without or with little guidance.
CHAPTER TWO
2.0 LITERATURE REVIEW
2.1 REVIEW OF THE STUDY
While it is only in recent years that refrigeration equipment has been mass-produced and widely used, its benefits will have been apparent to ancient man. The value of ice as a preservative was known and put to use thousands of years ago. In winter it was cut and moved into ice house which were built into the ground to make use of the insulating properties of social. Such a structure was described a Chinese poet, Shih ching about three thousand years ago. In the middle East and India, water was chilled by evaporating it through porous day pots which were buried overnight in favourable condition it could be made cold enough to form ice. The Indian Sub-continent also saw the first moves towards air conditioning.
In 1748, the first moves towards the use of modern system were recorded. William Cullen investigated the effects of evaporating ethyl either into a partial vacuum. It was, however, cumbersome to arrange good vacuums in those days, and it was not until 1834 that Jacob Perkins patented a closed- cycle refrigerating system using a compressor. In the same year he also pallented a high pressure hot water heating circuit. Ten years later John Corrie developed n air-cycle plant to make ice and to cool air for circulation through his hospital in Florida. Much development work was recorded on vapour compression system in the 1850’s. In the USA, Twinning’ s ice making equipment earned renown, while Jame Harrisob built units for meant freezing and brewery applications in Australia.
It is important to note that the introduction of ammonia as a refrigerant enabled efficiency and reliability to be improved. Ammonia inspired a new generation of reciprocating compressors and was used by Ferdinard Carrie in the first viable absorption refrigeration/freezer system.
Introduced in 1859, this used the ammonia water cycle still used in absorption type domestic freezer today.
In 1928, Thomas Midgely and his associates, Heinne and MC Navy made the compound dichlorodifluoromethance, CCL2F2 by removing 2 atoms of chlorine from tetrachloride methane (carbon tetrachloride) molecules and substituting them with two atoms of fluorine. In 1930, general Motors and in point formed kinematics chemicals inc. which started the mass production of this compound, hence mass production and diversification of the refrigeration/freezer systems.
One of the cycles used for mechanical refrigeration was the reversed Brayton cycle. Before Freon (the code name of dichlorodifluuoromathane) and other condensable fluids were developed for the vapour compression cycle, refrigerators/freezer operated on the Brayton cycle, using air as their working substance. Air undergoes usentropic compression followed by reversible constant pressure cooling. The higher-pressure air next expands reversibly in the engine and exhausts at low temperature. The cooled air passes through the cold storage chamber and finally returns to the suctions side of the compressor.
The litherto-discussed cycle gave way to the reverse carnot cycle. This cycle (Carnot cycle) needed little input of energy/work. It involves isentropic expansion of the refrigerant to the temperature of the cold body. This is followed by isothermal expansion at the temperature of the refrigerant fluid. Successively the fluid undergoes isentropic compression to the temperature of the hot body. Finally, before another cycle repeats itself, the refrigerant fluid undergoes isothermal compression at the temperature of the hot body. During the process, the hot body receives heat from the refrigerant fluid.
CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of 80cm 70cm 50cm mobile deep freezer is also available. Order full work to download. Chapter two of 80cm 70cm 50cm mobile deep freezer consists of the literature review. In this chapter all the related work on 80cm 70cm 50cm mobile deep freezer was reviewed.
CHAPTER THREE: The complete chapter three of 80cm 70cm 50cm mobile deep freezer is available. Order full work to download. Chapter three of 80cm 70cm 50cm mobile deep freezer consists of the methodology. In this chapter all the method used in carrying out this work was discussed.
CHAPTER FOUR: The complete chapter four of 80cm 70cm 50cm mobile deep freezer is available. Order full work to download. Chapter four of 80cm 70cm 50cm mobile deep freezer consists of all the test conducted during the work and the result gotten after the whole work
CHAPTER FIVE: The complete chapter five of design and construction of a 80cm 70cm 50cm mobile deep freezer is available. Order full work to download. Chapter five of 80cm 70cm 50cm mobile deep freezer consist of conclusion, recommendation and references.
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