Refrigeration is a branch of science that deals with the process of removing heat from a substance or space in order to make it cooler.
Refrigerator is defined as a device that is used in cooling the internal temperature below the room temperature (that is between 250C to 300C).
Generally, however, for a space or substance to be cooler, it must loss that heat to another. Also, for a space or substance to get hotter, it must absorb heat from another, which must be at higher temperature. For both process to occur, heat must be absorbed or lost, thus heat is the characteristics agent of heating and cooling, consequently, for heat flow there is absorbs at a lower temperature region and rejected at a higher temperature region, which is the quantity being determined by the temperature gradient of the two regions.
The modes of heat transmission are conduction concretion and radiation of which conduct convection and radiation, of which conduction and convection are extensively involved, in domestic refrigeration.
In refrigeration process, there is always a body employed as the heat absorber or indirect contact with the space or substance being cooled depending on the required final effect. Such cooling agents is known as refrigerant, which is known as the refrigerant, which is circulated around the evaporator that id high temperature region) and condensing region (that is higher temperature) in order to maintain a constant refrigeration process.
It does it work be evaporating (when it absorbs heat up to the boiling point temperature) and by condensing when it losses the absorbed heat to return to its original liquid state, in the system.
These heat when absorbed, may be classified as sensible heat or latent heat depending on its physical effect on the refrigerants.
TABLE OF CONTENTS
Letter of Transmittal
Table of Contents
Refrigerant Properties and Specific Application
The Various Instruments for Refrigeration Repairs
Analysis of Common Refrigeration
Faults, Fault Tracing, Repair and Maintenance of Refrigerators
Sequence of Operation
PROJECT REPAIR AND FABRICATION OF A REFRIGERATOR SYSTEM
INTRODUCTION REFRIGERATION Refrigeration is a branch of science that deals with the process of removing heat from a substance or space in order to make it cooler. Refrigerator is defined as a device that is used in cooling the internal temperature below the room temperature (that is between 250C to 300C). Generally, however, for a space or... Continue Reading
ABSTRACT FLUSHING OF THE CONDENSER The refrigerant gas let into the condenser through the compressor and the vacuum pump was connected to the condenser to absorb dirty. REFILLING OF GAS INTO THE COMPRESSOR Gas was refilled into the compressor due to shortage of gas and it was filled inside the charging value and refrigerant. CHANGING OF DRIVER... Continue Reading
ABSTRACT This report covers all activities candied out to rehabilitate a faulty refrigerator. First and foremost, we diagnosed the faulty refrigerator using the basic instruments to know the faults. After which we bought the necessary standard items that caused the fault. We then started work on it by replacing necessary instruments. We finally... Continue Reading
REPORT ON FABRICATION OF FLOW NOZZLE ABSTRACT The flow nozzle was constructed based on the dimensions and specifications of the international standard organization (I.S.O) recommendation. Throat diameter 42.5mm Length converging nozzle 68mm Thickness of nozzle 2mm Diameter of major axis of ellipse 85mm Diameter of minor axis of ellipse 56.6mm... Continue Reading
ABSTRACT Most often, the printing of very important reports have been stopped midway owing to some minor faults on the computer/printer system. At times, due to the complexity of the faults some maintenance personnel find it difficult beginning to perform detailed diagnosis due to lack of specialized equipment, some of which are available only... Continue Reading
REPORT ON ABSTRACT The construction of sieves system was carried out in the Engineering workshop, Institute of management and technology, Enugu. The aim of this project is to fabricate a sieve system, which is capable of separating solid particles of various sizes. The construction was carried out in order to... Continue Reading
CHAPTER ONE: 1.0 INTRODUCTION 1.1 Background of the study 1.2 Statement of the problem 1.3 Statement of the objectives 1.4 Research questions 1.5 Research hypotheses 1.6 Significance of the study 1.7 Scope of the study 1.8 Limitations of the study 1.9 Definition of terms CHAPTER TWO: 2.0 REVIEW OF RELATED LITERATURE 2.1 Concept of internal... Continue Reading
ABSTRACT This write up is a detail of the process and formulation of plan for the physical realization of the construction of a refrigerator. It is divided into chapter, which discussed extensively the practical refrigeration cycle with full attention given to design factors, working principle and choice of material. The method used in... Continue Reading
ABSTRACT This write up is a detain of the process and formulation of plan for the physical realization of the construction of a mobile cooking system. It as divided into chapters, which discussed extensively the practical refrigerator cycle with attention given to constriction factors, working principle and choice of materials. The method used in... Continue Reading
ABSTRACT This write up is a detain of the process and formulation of plan for the physical realization of the construction of a mobile cooking system. It as divided into chapters, which discussed extensively the practical refrigerator cycle with attention given to constriction factors, working principle and... Continue Reading