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The Repair And Maintenance Of A Faulty Deep Freezer
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CHAPTER ONE
INTRODUCTION
Refrigeration is the process of
removing heat from a substance or space in order to make it cool. It is
defined also as a branch of science that deals with the process of
reducing and maintaining the temperature of a space, substance or
material below the temperature of the surrounding.
For a space,
substance or material to be cooled, it has to loose heat to another
substance. On the other hand, for a material or substance to get hot, it
has to absorb heat from another substance or material. Therefore heat
is the agent of refrigeration process. For heat to flow there must be
medium or mode to heat transfer. It is also a known phenomenon that heat
flows from high temperature regions to low temperature regions by
conduction, convention or radiation. However, in freezer and domestic
refrigeration’s generally conduction and convention are employed as
modes of heat transfer.
Refrigerant is the cooling agent in
refrigeration. It makes indirect contact with the substance to be
cooled. It is circulated in refrigeration circuit and the attendant
change of state from liquid to vapour brings about the necessary cooling
that is required in the system, which also involves latent or sensible
heats.
Generally, when a mass absorbs heat, the following physical change takes place.
1. The mass expands in physical dimension.
2. The temperature increases.
3. There may be change in phase (solid, liquid and vapour or gas) and vice versa.
4. The specific density decreases (as the mass remains constant while the volume increases).
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ABSRACT - [ Total Page(s): 1 ]Mechanical Engineering Department of the Institute of Management and Technology has many non – functional machines. This is caused as a result of poor maintenance culture, which in turn resulted to breakdown of the Deep Freezer under review.Quality and effectiveness of machine maintenance were observed. A minimized cost of maintenance and high Technology of repair were also adopted.In otherwords, during the repair and maintenance of the faulty Deep Freezer, appropriate tools, instrume ... Continue reading---
