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This write up focuses attention on a detailed report and account on the process of construction and formulation of plan for the actual and physical realization of the construction of the project work captioned fabrication and construction of a mobile cooling system. The report is therefore divided into chapters and each chapter discussed extensively such that an illiterate refrigerator mechanic who read and comprehends the report can easily carryout the construction of refrigerator under little guidance and supervision.
Subsequently, the principles of influencing the operation of a cooling system, choice of materials, various methods used in the fabrication and recommendation for advancement were duely treated.
Therefore, as the cooling system composed of mechanical and electric all parts, a lot of effort were made to break and discuss the various stages and sequences of assembly. Stating a quite number of safety rules which must be adhered strictly to by and intended person or persons, who may embark on the project in future to achieve a positive result.
Finally, this write up also encompasses the maintenance of any cooling system irrespective of the size and make without limiting it to only mobile refrigerator, with due consideration that we are in the modern age of refrigeration due to the gradual destruction of the ozone layer, so that any person who seized the opportunity of reading through the report can maintain such equipment no matter the size and complexity with ease and save himself from being overheated by the sun.
A mobile refrigerator is not a different refrigerator than a refrigerator that is portable (ie it can be moved fro one place to another with little application of force).
Here, the mechanical refrigeration has to do with the production of a machine that controls a temperature lower than atmospheric temperature. This implies that it is t he process of removing heat at a low temperature level and rejecting it at a relatively higher temperature level.
By its nature, heat flows from a body at a higher temperature to anot her at a lower temperature but in the reverse case, it requires external energy to be accomplished. T he carrier substance used to carry heat is called a refrigerant. Therefore refrigerator is the reversed heat engine cycle.
Refrigeration is accomplished by various methods, such as the vapour compression system, absorption system, and steam jet refrigeration cycle. In this project only vapour compression system of refrigeration shall be discussed as it was the method adopted to accomplished the refrigeration.
Refrigeration contributes to the raising of living standard of people of all classes and land. Although refrigeration is primarily an of thermodynamics, but advances made refrigerant in recent years to grow into so many phrase where we need technicians, craft persons, engineers, scientists, and others from phases of engineering pool skills and knowledge in the design, manufacturer application and operation of the refrigeration. Complete knowledge of thermodynamics and properties of refrigerants must be known before the complete cycle analysis can be made.
The application of the refrigeration principle is limitless. The most common used and ones that is readily recognized is the preservation of food and chilling of our drinks and water during the time we are feeling hot and need our body to be chilled.
1.1 PURPOSE OF CONSTRUCTION
The main objectives of the this project is to achieve the following purpose viz:
a. To construct and fabricate a portable domestic cooling equipment that would be easy to be moved to any convenient position.
b. To construct a cooling/freezing system that is efficient with little or no complexity in maintenance.
c. To construct cooling system that will be mobile, economic and cost effective that even a common man can afford.
d. To produce a machine that will make life easier and more comfortable to live, even in a hot environment, and season.
e. To construct a portable cooling system equipment with a reduced weight.
1.2 IMPORTANCE AND SPECIFICATION OF PROJECT
The importance attached to this construct is the accomplishment of a fast freezing system without breaking of bottles at very low temperature and without adverse effects on the food tissues, the flavour, freshness and natural nutrients of food materials. The construction intention is based on reduced weight and cost, longer life span, fast freezing techniques, compactness, portability and so on, while constructing this project we put into consideration the Nigeria factor and possibility of expanding and marketability and its adverse effects on our environment, that is why we used refrigerant that has no effect on our ozone layer.
While taking the specification on the size we put into consideration the item that are to be cooled or preserved. Also the cabinet dimensions and compressor capacity were put into consideration as well.
The essential design parameters for the mobile refrigerator are as follows:
ii. Capillary tube
vii. Rubber seal
ix. Relay and overload
xi. Lagging materials
xii. Lubricating oil
xiii. Mild steel metal sheet
xiv. Aluminum sheet
1.3 SCOPE AND LIMITATION
Refrigeration can be divided into three main categories namely:
i. Industrial refrigeration
ii. Commercial refrigeration
iii. Domestic refrigeration
The design “mobile Refrigerator” as it’s name entails is for domestic application and to some extent for commercial purpose due to its fast freezing nature and mobility.
Well the limitation of this mobile cooling system is basically on its specification in terms of size, capacity and area of need in terms of power source. Based on the specification, the equipment is not congruent for industrial use, where large refrigerator unit are more ideal and readily available.
1.4 STATEMENT OF PROBLEMS
The use of low temperature refrigeration to obtain expansion fits has substituted shrunk fitting of metal parts, in the chilling of aluminum rivets to control age hardening, the stimulation of straphere conditions in the laboratory for the testing of all types of air craft equipment, including the engine themselves requires refrigeration at - 670F, in the process industries refrigeration is used to carry out such operation a s the separation of crystals from solutions.
Application of refrigeration in the medical profession is increasing daily, not only in the preservation of certain products, but also in the actual treatment of some physical ailments. The use of cold “anesthesia” has shown great promise in the field of surgery. The manufacture of penicillin requires refrigeration and removal of moisture under high vacuum. The same process is required in the drying of blood plasma, and the preservation of blood which requires refrigeration before the dry is accomplished.
In the refrigerated food industry, developments are occurring so rapidly that it is difficult to keep abreast of them. In case application of domestic refrigerators have been supplemented by the entire new field of domestic low – temperature cabinets for the preparation and storage of frozen foods, both inc cooked and pre cooked. Lower plants for the storage of frozen food are becoming common thing both in our rural and urban areas. The movement of our foodstuff has been a matter of concern over years, but with the new development in the refrigeration of ships, rail road, cars and trucks. These are but a few of the widespread applications of refrigeration. In serving some of the function and considering the area and situation of need such as resort centers, picnic, school etc. Hence the need arises more than even prior to design of mobile cooling system of acceptable standard that will meet certain essential requirement such as portability and cost effectiveness.
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