-
Fabrication On Domestic Refrigerator
CHAPTER THREE -- [Total Page(s) 3]
Page 2 of 3
-
-
-
3.3 COMPRESSOR
The designed compressor is required to suck the vapour 216KN/M^2 when the operating condition is -15°Cevaortor and 3°C condenser temperature.
Velocity of the Compressor
The allowable vapour velocity an on louse is a function of the third density and varies with different refrigerant under similar condition of temperature. For example, R-22 having a density of 12271B per cubic it at 5°C has a maximum value velocity of 12,000 to I 5,000 ram, while refrigerant R- 12 with density of 0.67:3 at a similar temperature is limited to approximately 6000 ram. The use term maximum allowable here means:
No apparent loss in volumetric efficiency
The abnormal increase in horse power per toil of refrigeration occurs.
The relation may be expressed from the law which says “The volume
of gas is inversely proportional to the square foot of the density.
Vα√(1&d)……………………………………..[Threkeld J. K. (‘1 970)]
Where V = velocity measured in mls
d = density and it is measured in Kg/rn3 by using refrigerant RI34a in system and accept 13,500 vain as its maximum allowable volume velocity.
We have
Vα√(1&d)
V1V2α√(1&d)
V1 = initial velocity
V2= final velocity
d1= initial densiLy
d2= maximum density
 
COMPRESSOR DISCHARGE TEMPERATURE
Applying the thermodynamic equation is one of the methods use fordetermining compressor discharge temperature.
T_2/T_1 (P_2/P_1 ) Y - 1/Y………………………………………….[Threlkeld J L.([970)]
Where Y = 1.14
Y = 1/y = 1.14 - 1/1.14
= 0.263k
T_2/T_1 (P_2/P_1 ) 0.263
T2 = T1 (P_2/P_1 ) 0.263
Where P_1 -15,273-15 = 258k
T2 = ?
P_1= 261 KN/M^2
P_2= 847 KN/M^2
T_2= T_1 (P_2/P_1 )0.263
T_2= 258(847/261)0.263
T_2= 258(1.3629)
T_2= 351.6K
T_2= 351.6-273
T_2= 〖78.6〗^0 c
SPECIFIC VOLUME- COMPRESSOR DISCHARGE
The specific volume of discharge vapor can also be established by employing the similar:
V_2=V_(1 ) (P_2/P_1 ) 1/Y………………………….[Threlkeld J.L,(1970)]
V_2=〖 1.485(0.308)〗^0.877
V_2=〖 0.5298m〗^3
Compressor ration
=(final pressure)/(intial pressure)…………………..[Marsh)R.W.Olivaia (1976)]
Compressor ration =P_1/P_1 =847/261 = 3.24
CHAPTER THREE -- [Total Page(s) 3]
Page 2 of 3
-
-
ABSRACT - [ Total Page(s): 1 ]ABSTRACTThis paper describes the quick and precise control method for domestic refrigerator. The propose controller is based on the fuzzy logic and neutral network designed maintaining the constant inner temperature (of the refrigerator and improving the refrigerator efficiency. The fuzzy logic controller is used to maintain the inner temperature inspite of the environment variation such as outer temperature change of the volume change of the stored food to the refrigerator a neutral network is ... Continue reading---
TABLE OF CONTENTS - [ Total Page(s): 1 ]TABLE OF CONTENTSTile Page Certification Dedication Acknowledgement Abstract Table of Contents CHAPTER ONE: INTRODUCTION1.1 Refrigeration System 1.2 Aim and Objective 1.3 The Need of Refrigerator CHAPTER TWO2.1 Literature Review 2.2 The Air Refrigeration System 2.3 Vapour Absorption Refrigeration System 2.4 Principle of Operation Absorption Refrigeration System 2.5 The Vapour Compression Refrigerator System 2.6 ... Continue reading---
CHAPTER ONE - [ Total Page(s): 2 ]As a result, we are not limited to the engagement of fruits vegetables and other product growth locally at any given time of the year, but we can have food product from the distance lands an4 other part of the country. Economic Growth: refrigeration has helped the economy of many areas by providing a means preserving their product enrooted to remote area for consumers.Hospital: Refrigerators are used in the hospitals for the preservation of bone, blood tissue and some drugs that are to be kept u ... Continue reading---
CHAPTER TWO - [ Total Page(s): 2 ]CHAPTER TWO2.1 LITERATURE REVIEWRefrigeration is the branch of engineering that is concern with the producing and maintaining temperature below that of the surrounding atmosphere .this implies the development of temperature differential rather than the establishment of a given temperature level. The act was known to the ancient Egyptians and the people of Indian, who use evaporation to cool liquid in porous earthen jar exposed to dry night air, and to the early Chinese, Greeks and Romans w ... Continue reading---
CHAPTER FOUR - [ Total Page(s): 6 ]4.3 EVAPORATORThe evaporator is that part of refrigerating system where heat is removed from the product to be cooled. It is also called cooling coil.As the refrigerant enters the passage of the evaporator it absorbs heat from the product it begins to boil and vaporizes. In this process, the evaporatoraccomplishes the purpose of the system refrigeration William, (2005).There are two (2) classification of evaporator1. Base on operating conditioni. Flooded type evaporatorii. ... Continue reading---
CHAPTER FIVE - [ Total Page(s): 1 ]CHAPTER FIVECONCLUSION AND RECOMMENDATION5.1 CONCLUSIONRefrigeration is the science of producing and maintaining a temperature below that of the surrounding atmosphere i.e it is an act of removing heat from a substance to be cooled.This project work was a direct integration of both the theoretical acknowledge and practical skills required in the course of study, and has the acquainted the relevance of engineering science to technological growth and development.The project was based on the ... Continue reading---
REFRENCES - [ Total Page(s): 1 ]REFERENCESCoiling and William e. Worthington, (2005): “Refrigeration Systemâ€, New York.Collin Hempstead and William E., Worth Ton, (2005): Encyclopedia of 20thCentury Technology, Volume 2, London.Guy, (1984): “Hand Book Of Product And Directing†(Equipment Of Volume) Mc Grew Hill Company, New York.Marsh,& Olive, (1970): “Principle Of Refrigeration†2nd Edition, Demur Publishers, Albany, New York. McGraw-Hill 1998,Refrigeration.Nicolas Leonard Sad Carnal, (1824 ... Continue reading---
