REPAIR OF A DAMAGED REFRIGERATOR


REPAIR OF A DAMAGED REFRIGERATOR 

ABSTRACT

Mechanical Engineering Department of the named institute has many has non operational machines sequel to the fact, maintenance was poorly executed which resulted to the breakdown of this refrigerator.

Quality and effectiveness of machine maintenance were well observed.  Also, a minimized cost of maintenance and a highly successful repair was adopted.

In otherwords, during the repair and rehabilitation of this refrigerator appropriate tools, cost and quality of materials were well considered.

INTRODUCTION

Refrigeration is the process, which deals with the process of reducing and maintain the temperature of a material or space below the temperature of the surroundings.  Refrigerator is an electro mechanical appliance, which carry out the refrigeration principle.

In otherwords, a refrigerator absorbs heat from a low temperature region.  Consequently, thus he at flows are transmitted through a medium or mode conduction, convention and radiation transmit heat.  Conduction and convection art extensively adopted in refrigeration.

Refrigerators contain some components, which transmit the mode of heat flow.  They are compressors, evaporators, condenser, and expansion valve etc.  These components after some constant usage are required to be maintained.  Maintenance is generally defined as the up keep repair, renewal and replacement of worn, damage or absolute parts of a machinery, equipment or building.  These can be corrective, preventive or breakdown maintenance.  Observing the steps in tracing the faults associated with each component and the necessary replacement in this case carried out maintenance or repair was carried out.

These activities were carried out using the instrument for the refrigeration repair such as pinch off tools, ratchet, manifold guage, and thermometer, the application of halide lease detector.

In this write up, the application and uses of refrigerator was discovered, refrigerants and their properties, determination of co-efficient of performance (COP) and refrigerator effect, as well as sequence operation and cost analysis.

Summarily, this test contains all you need to know about, refrigeration and its principle, application and uses, it maintenance, determination of the COP and refrigeration effect, as well as sequence of operation and cot analysis.

TABLE OF CONTENTS

Title page

Release page

Letter of transmittal

Approval page

Acknowledgement

Dedication

Abstract

Literature review

Introduction

Table of contents

CHAPTER ONE

Refrigeration

Refrigerant

Refrigerator

CHAPTER TWO

COMPONENT PARTS OF A REFRIGERATOR

CHAPTER THREE

Maintenance

Repairs and rehabilitation

Step taken towards ensuring adequate maintenance of the refrigerator

CHAPTER FOUR

Tools And Instrument Used In Maintenance Of Refrigerator

CHAPTER FIVE

Application And Uses Of A Refrigerator

CHAPTER SIX

Determination Of Cop And Refrigeration Effect

CHAPTER SEVEN

Cost evaluation

Conclusion

Bibliography

CHAPTER ONE

REFRIGERATION

Refrigeration is defined as a process of removing heat from a substance or space in other to make it cooler.  More so, it is the branch of science which deals with the process of reducing and maintaining the temperature of the surrounding.

Generally, for a space to be cooler, it must lose heat to another substance.  Also for a space or material to get hotter, it must absorb heat from another substance.  Thus, heat is the characteristic agent of heating and cooling.  Consequently, for heat to flow, there must be a medium or mode for the transmission.  This always follows from high temperature region to low temperature region/bodies.

The modes of heat transmission are conduction, convection and radiation.  Conduction and convection are extensively involved in domestic refrigeration.

In refrigeration process, there is always a body employed as the heat absorber  or the cooling agent which may be near to the material or space being cooled or space being cooled or in direct contact with the material being cooled depending on the required final effect such a cooling agent is known as the Refrigerant.  The refrigerant circulates around the evaporating and condensing regions.  In other to maintain a constant refrigeration process it does it work by evaporating and condensing.  When it loses the absorbed heat to return to its original liquid or solid rate, as the case may be classified a s sensible heat or latent heat, (depending on the physical effect on the refrigerants.  Generally, when a mass or body absorbs heat the following physical changes takes place.

1.    The mass expands or increases in physical dimensions as the molecules resonate within a wider range

2.    The temperature increase (as the molecules gain more internal lunatic energy)

3.    There is a change in phase (as the mass changes from solid to liquid and consequently to gas and vice versa)

4.    The specific density decreases (as the mass remain constant while the volume increase) etc.

All these result to the refrigerant evaporating into the surrounding space/atmosphere and needs to be physically re-cycled to the original condition for another turn of refrigeration.  Over and over again, the processes are repeated and more cooling achieved.  Moreover, the sensible heat leads to the increase in the temperature of the refrigerant from one phase to another phase (solid – liquid – gas).  A refrigeration cycle is said to have been completed when this refrigerant has undertaken all its metamorphic circulation from the compressor, round, and back to the compressor again.

Another area worthy of consideration in refrigeration is the pressure effect.  It has a linear and positive relationship with temperature, which is the basic property of the transmission.  Adding pressure to the body induces internal stress on the molecular structure of the body.  Pressure can be used to increase the heat capacity of a body, thus, increase in the atmospheric pressure of a substance brings about a relative increase in the boiling point of that substance.  Also, sudden expansion or a compressed gas brings about an effective cooling and this explains the reasons why refrigerant gases are sealed and circulated under pressure. On the other hand, a reduction in the atmospheric pressure of a substance brings about a comparative decrease in the boiling point of that substance, in all, pressure increase and decrease of a particular substance causes temperature increase and decrease respectively of that substance.

Never the less, the whole of the refrigeration conditions explained above in abstract in the natural realms.   Heat does not flow from a cold region, as in the refrigeration process without work done against the natural principle.  Hence, energy is required, which is artificially produced and at this we now talk of refrigeration.

THE REFRIGERATOR

A refrigerator is an electro mechanical appliance, which is used in maintaining the temperature of substance as required by the user, or it is an electro mechanical appliance used in carrying on artificial cooling.  It operates with the principle of reversed carnet cycle.  In other words, heat is absorbed from a low temperature region and rejected to a high temperature region.  The temperature at which heat is absorbed are kept at constant.

The energy for the pumping of the refrigerant  round the refrigeration cycle comes from the compressor (that of the refrigerator).  It makes use of other mechanical and electric al components.  The torque for driving the crankshaft and consequently the piston is produced by an electric motor (it makes use of magnetic effects of current).  Similarly, the pumping effect of the piston creates the high pressure which induces to the refrigeration.  This thus, sets in motion the refrigerants, which after some physical metamorphosis returns to the former state ready   for another cycle.

 In the refrigerator, the condenser performs a function similar to that of the radiator in an automobile.  It is the cooling coil for the hot refrigerants gas.  In the condenser, the refrigerant is condensed and expelled to the surrounding atmosphere, the metering device expands the gas as another pipe passes through the capillary tube and suddenly expands into another pipe of  larger cross section, the evaporator consist of convolutions of a copper tubing which is where the actual cooling action of the refrigerator takes place.

However, a hot        of insulation is done to isolate t he refrigeration space from the surrounding environment and its effects.  This is achieved by the following measures.

i.    The body was made up or lagged   with poor heat conductor.

ii.    The inside and the outside are brightly coloured to effect light and heat reflection

iii.    The condenser tubing is positioned externally at the back of the refrigerator and a very poor heat conducting materials like fibre glass.

.

REPAIR OF A DAMAGED REFRIGERATOR



TYPE IN YOUR TOPIC AND CLICK SEARCH.






RESEARCHWAP.ORG

Researchwap.org is an online repository for free project topics and research materials, articles and custom writing of research works. We’re an online resource centre that provides a vast database for students to access numerous research project topics and materials. Researchwap.org guides and assist Postgraduate, Undergraduate and Final Year Students with well researched and quality project topics, topic ideas, research guides and project materials. We’re reliable and trustworthy, and we really understand what is called “time factor”, that is why we’ve simplified the process so that students can get their research projects ready on time. Our platform provides more educational services, such as hiring a writer, research analysis, and software for computer science research and we also seriously adhere to a timely delivery.

TESTIMONIES FROM OUR CLIENTS


Please feel free to carefully review some written and captured responses from our satisfied clients.

  • "Exceptionally outstanding. Highly recommend for all who wish to have effective and excellent project defence. Easily Accessable, Affordable, Effective and effective."

    Debby Henry George, Massachusetts Institute of Technology (MIT), Cambridge, USA.
  • "I saw this website on facebook page and I did not even bother since I was in a hurry to complete my project. But I am totally amazed that when I visited the website and saw the topic I was looking for and I decided to give a try and now I have received it within an hour after ordering the material. Am grateful guys!"

    Hilary Yusuf, United States International University Africa, Nairobi, Kenya.
  • "Researchwap.org is a website I recommend to all student and researchers within and outside the country. The web owners are doing great job and I appreciate them for that. Once again, thank you very much "researchwap.org" and God bless you and your business! ."

    Debby Henry George, Massachusetts Institute of Technology (MIT), Cambridge, USA.
  • "Great User Experience, Nice flows and Superb functionalities.The app is indeed a great tech innovation for greasing the wheels of final year, research and other pedagogical related project works. A trial would definitely convince you."

    Lamilare Valentine, Kwame Nkrumah University, Kumasi, Ghana.
  • "I love what you guys are doing, your material guided me well through my research. Thank you for helping me achieve academic success."

    Sampson, University of Nigeria, Nsukka.
  • "researchwap.com is God-sent! I got good grades in my seminar and project with the help of your service, thank you soooooo much."

    Cynthia, Akwa Ibom State University .
  • "Sorry, it was in my spam folder all along, I should have looked it up properly first. Please keep up the good work, your team is quite commited. Am grateful...I will certainly refer my friends too."

    Elizabeth, Obafemi Awolowo University
  • "Am happy the defense went well, thanks to your articles. I may not be able to express how grateful I am for all your assistance, but on my honour, I owe you guys a good number of referrals. Thank you once again."

    Ali Olanrewaju, Lagos State University.
  • "My Dear Researchwap, initially I never believed one can actually do honest business transactions with Nigerians online until i stumbled into your website. You have broken a new legacy of record as far as am concerned. Keep up the good work!"

    Willie Ekereobong, University of Port Harcourt.
  • "WOW, SO IT'S TRUE??!! I can't believe I got this quality work for just 3k...I thought it was scam ooo. I wouldn't mind if it goes for over 5k, its worth it. Thank you!"

    Theressa, Igbinedion University.
  • "I did not see my project topic on your website so I decided to call your customer care number, the attention I got was epic! I got help from the beginning to the end of my project in just 3 days, they even taught me how to defend my project and I got a 'B' at the end. Thank you so much researchwap.com, infact, I owe my graduating well today to you guys...."

    Joseph, Abia state Polytechnic.
  • "My friend told me about ResearchWap website, I doubted her until I saw her receive her full project in less than 15 miniutes, I tried mine too and got it same, right now, am telling everyone in my school about researchwap.com, no one has to suffer any more writing their project. Thank you for making life easy for me and my fellow students... Keep up the good work"

    Christiana, Landmark University .
  • "I wish I knew you guys when I wrote my first degree project, it took so much time and effort then. Now, with just a click of a button, I got my complete project in less than 15 minutes. You guys are too amazing!."

    Musa, Federal University of Technology Minna
  • "I was scared at first when I saw your website but I decided to risk my last 3k and surprisingly I got my complete project in my email box instantly. This is so nice!!!."

    Ali Obafemi, Ibrahim Badamasi Babangida University, Niger State.
  • To contribute to our success story, send us a feedback or please kindly call 2348037664978.
    Then your comment and contact will be published here also with your consent.

    Thank you for choosing researchwap.com.