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BY

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--/H2013/01430
DEPARTMENT OF ----
SCHOOL OF ---
INSTITUTE OF ---

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APPROVAL PAGE

This is to certify that the research work, "design and construction of electric blower for furnace" by ---, Reg. No. --/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.

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Signature……………….                           Signature……………….        

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DEDICATION
This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my --- for his financial support and moral care towards me.Also to my mentor --- for her academic advice she often gives to me. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen.

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ACKNOWLEDGEMENT

The successful completion of this project work could not have been a reality without the encouragement of my --- and other people. My immensely appreciation goes to my humble and able supervisor mr. --- for his kindness in supervising this project.
My warmest gratitude goes to my parents for their moral, spiritual and financial support throughout my study in this institution.
My appreciation goes to some of my lecturers among whom are Mr. ---, and Dr. ---. I also recognize the support of some of the staff of --- among whom are: The General Manager, Deputy General manager, the internal Auditor Mr. --- and the ---. Finally, my appreciation goes to my elder sister ---, my lovely friends mercy ---, ---, --- and many others who were quite helpful.

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During furnace operation, air is the utility that should be available at all time in order to ensure a smooth and standardized operation. Supplying air manually will reduce productivity and more man hour to accomplish a given task.  Thus, an electric blower was designed in this regard with an efficient electric motor as the driver. The suction conditions and other application data are appropriately used to calculate the design parameters such as: suction specific speed, the power input to the blower, the inlet and outlet velocity, the twisting moment of the impeller shaft etc.
The principle adopted in this design is that the impeller was made of a close type because of the level of pressure needed to carry out blowing operations in a furnace. The blower was designed to convert driver energy to kinetic energy by accelerating it to the outer rim of the impeller and the impeller driven by the connecting shaft adds the velocity component to the air by centrifugally casting the air away from the impeller vane tips.

 

TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
TABLE OF CONTENT
CHAPTER ONE
1.1      INTRODUCTION
1.2      APPLICATION OF ELECTRIC BLOWER
1.3      SIGNIFICANCE OF THE PROJECT
1.4      SCOPE OF THE PROJECT
1.5      LIMITATION OF THE PROJECT

CHAPTER TWO
2.0     LITERATURE REVIEW
2.1      REVIEW OF THE STUDY
2.2     REVIEW OF DIFFERENT TYPES OF BLOWER
2.3      OVERVIEW OF A FURNACE
2.4      CATEGORIES OF FURNACE

CHAPTER THREE
3.0     CONSTRUCTION METHODOLOGY
3.1      SYSTEM HOUSING
3.2      SYSTEM MOTOR  FIXED WITH THE FAN
3.3      WORKING PRINCIPLE
3.4      SYSTEM WIRING

CHAPTER FOUR
RESULT ANALYSIS
4.0      CONSTRUCTION PROCEDURE AND TESTING
4.1      CASING AND PACKAGING
4.2      ASSEMBLING OF SECTIONS
4.3      DESIGN LIMITATION
4.4      ELECTRIC UTILITY TEST RESULTS
4.5      SAFETY REQUIREMENTS
4.6      CHANGE MOTOR SPEEDS
4.7      REPLACING THE BLOWER MOTOR
4.8      FINAL SYSTEM CHECKOUT
CHAPTER FIVE     
5.0      CONCLUSION
5.1      REFERENCES

 

 

CHAPTER ONE
1.0                                                              INTRODUCTION
The blowers in furnaces typically move the heated air through a duct system that distributes heat and then returns it to the furnace. Usually the blowers are double inlet models with the inlets to the centrifugal blower at both sides. The motor mounts inside the inlet cone on one side. If a house has central air-conditioning, the same blower is usually used to move the cooled air throughout the house.
Although furnaces, air conditioners and heat pumps have become significantly more efficient over the last couple of decades, residential forced air system blowers have not experienced similar improvement. The most common blowers have been shown by in-field testing to  have efficiencies of only 10% to 15% (Phillips 1998 & 1995 Gusdorf et al. 2002). These low efficiencies indicate that there is significant room for improvement of both electric motor and the aerodynamic performance of furnace blowers.
An important consideration in analyzing forced air system blowers is that essentially all of the wasted electricity is manifested as heat. This extra heat reduces air conditioning cooling and dehumidification performance and effectively acts as fuel switching for fossil fuelled furnaces. For electric furnaces, this heat substitutes directly for the electric resistance heating elements. For heat pumps, this heat substitutes for vapor compression-based high COP heating and effectively reduces the COP of the heat pump.

In this study, the aim is to characterize the performance of electric furnace blowers to determine typical energy consumption, how performance differs between standard laboratory rating conditions and real life applications, what attributes of blowers contribute significantly to their performance, and to use this information to evaluate proposed performance testing.

1.1                                             OBJECTIVE OF THE PROJECT
The objective of the project is to fabricate an electric device that is used to produce consistent air supply to the base of the fire to aid the combustion process.

1.2                                         SIGNIFICANCE OF THE PROJECT
The electric blower is one of the most important and portable tools in a blacksmith’s workshop. The function of the blower is to deliver a consistent air supply to the base of the fire to aid the combustion process. Supplying the fire with oxygen means that the fire can get to a temperature hot enough to manipulate and craft iron objects – without a consistent supply of oxygen, this task is nearly impossible.

1.3                                     APPLICATION OF ELECTRICBLOWER
This work is used for local and industrial use for shaping or bending of metal. Electric blower is one of the most important and portable tools in a blacksmith’s workshop which is also used in electric furnace.

1.4                                                 SCOPE OF THE PROJECT
In the early days, it was common for a blacksmith’s apprentice to use their lungs to blow air into a hollow tube, directly into the base of the fire. This method was not very effective as the majority of the oxygen they inhaled would get absorbed by the lungs, and the exhalation contained a lot of carbon dioxide which did not help the fire. This was not an effective method. It was this reason that forge blower was introduced. The blower was designed to convert driver energy to kinetic energy by accelerating it to the outer rim of the impeller and the impeller driven by the connecting shaft adds the velocity component to the air by centrifugally casting the air away from the impeller vane tips.
Parts produced by forging are stronger than casted or machined parts. During the forging process the internal grain of the part changes its form and continuous forging for a few minutes strengthens the part's characteristics.
This device has been built. This includes identifying suitable performance metrics and target performance levels for use in standards. Five different combinations of blowers and residential furnaces were tested for air moving performance. Three different types of blower and motor combinations were tested in two different furnace cabinets. The blowers were standard forward–curved impellors and a prototype impeller.  The testing operated each blower and furnace combination over a range of air flows and pressure differences to determine air flow performance, power consumption and efficiency. Additional tests varied the clearance between the blower housing and the furnace cabinet, and the routing of air flow into the blower cabinet.

1.5                                           LIMITATION OF THE PROJECT

• This device prevents work hardening and hence increases the difficulty of performing other machining operations on the part.
• Producing forged parts involves a lot of expenditure for the machinery, dies, tools and personnel.
• Some forging requires metal-forming dies, which are required to be precisely machined and heated to properly shape the piece. This is not always achievable by novices or not very-high experienced engineers.

 

CHAPTER FIVE
5.1                                                                CONCLUSION
This device have been built and analyzed, from the result blowers have distinctly different performance characteristics that must be accounted for when proposing performance specifications. An electric blower have better performance in terms of maintaining air flow at typical system pressures and reduced power consumption. However, the advantage for this blowers is marginal at high pressures above about 200 Pa.
As system pressures increase, the blower power consumption decreases as it is unable to maintain air flow. This blowers have cfm/W ratings that are very close to proposed performance specifications, while the generally higher cfm/W ratings for BPM blowers will make it easier for them to meet these specifications. A performance specification should include both an air flow specification and a cfm/W specification.
Because the performance of blowers at operating conditions is close to probable performance specification limits, although the fractional performance changes are about 15% for blowers, the effects of restrictive cabinets and return air inlet locations could be significant...

 

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CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of "design and construction of electric blower for furnace" is also available. Order full work to download. Chapter two of "design and construction of electric blower for furnace" consists of the literature review. In this chapter all the related work on "design and construction of electric blower for furnace" was reviewed.

CHAPTER THREE: The complete chapter three of "design and construction of electric blower for furnace" is available. Order full work to download. Chapter three of "design and construction of electric blower for furnace" consists of the methodology. In this chapter all the method used in carrying out this work was discussed.

CHAPTER FOUR: The complete chapter four of "design and construction of electric blower for furnace" is available. Order full work to download. Chapter four of "design and construction of electric blower for furnace" consists of all the test conducted during the work and the result gotten after the whole work

CHAPTER FIVE: The complete chapter five of "design and construction of electric blower for furnace" is available. Order full work to download. Chapter five of "design and construction of electric blower for furnace" consist of conclusion, recommendation and references.

 

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