ABSTRACT

An automatic cooling fan system is constructed and developed in this research. The device uses a temperature sensor; a comparator unit and relay switch to automatically regulate the speed of the fan, creating breeze to enhance convective heat transfer. The developed household electric fan automatically changes speed in five different ascending levels with respect to the calibrated temperature range of the environment. Depending on the temperature of the environment, the fan automatically regulates its speed, making the device safe for sleeping, very convenient for patients in the hospital, infants and all users. The development improved cooling fan system achieved improved ventilation of the room up to 20% using enhanced blades designed with due consideration to fan acrodynamics.

TABLE OF CONTENTS

Title page    –         –         –         –         –         –         –         –         i

Certification          –         –         –         –         –         –         –         ii

Dedication   –         –         –         –         –         –         –         –         iii

Acknowledgement –         –         –         –         –         –         –         iv-v

Abstracts      –         –         –         –         –         –         –         –         vi

Table of content     –         –         –         –         –         –         –         vii-viii

CHAPTER ONE: INTRODUCTION

1.1 Background of the study –         –         –         –         –         1-3

1.2 Aim and objectives of the study –         –         –         –         3

1.3 Scope and limitation of the study –         –         –         –         4

1.4 Definition of the terms (if any)     –         –         –         –         4

CHAPTER TWO: LITERATURE REVIEW

2.1 Operational principle of a cooling system          –         –         5-6

2.2 Types of cooling system      –         –         –         –         –         6

2.2.1 Air cooling system  –         –         –         –         –         –         6-8

2.2.2 Water cooling system       –         –         –         –         –         8-11

2.3 Lubricating system    –         –         –         –         –         –         11-13

2.4 Application of Automating Fan control   –         –         –         13-15

2.5 Automatic Fan control Techniques –         –         –         –         16-20

CHAPTER THREE: MATERIAL AND METHOD

3.1 Materials          –         –         –         –         –         –         –         21

3.2 Methods –         –         –         –         –         –         –         –         22

CHAPTER FOUR: RESULT AND DISCUSSION

4.1 Result     –         –         –         –         –         –         –         –         23

4.2 Discussion       –         –         –         –         –         –         –         23-24

CHAPTER FIVE: CONCLUSION AND RECOMMENDATION

5.1 Conclusion       –         –         –         –         –         –         –         25

5.2 Recommendation       –         –         –         –         –         –         25-26

References

CHAPTER ONE: INTRODUCTION

1.1 Background of the Study

Electric Fan is one of the most popular electrical appliances widely used in tropical cooling due to its cost effectiveness, low power consumption, and efficiency in attaining excellent ventilation (Cory, 2010). Presently, the regular electric fans used in the house consist of a speed regulator calibrated into five ascending order which is manually controlled to the desired speed (Farex Refieved. 2012). This sometimes poses a challenge for a user that is not fully conscious while the fan is in operation for example; when a person is sleeping; when a body is in the room alone; or for the patients in the hospital unaided. Consider a scenario when a person is in deep sleep and with the fan set to the highest speed because of a hot weather. If the weather suddenly changes and is very cold, the person will be extremely cold and might catch cold or even result to pneumonia. Similarly, a baby that is under the fan alone might develop cold or when in extremely hot weather develop heat rashes if the fan speed is not property controlled.

The inconvenience and the risk of not regulating the speed of a fan timely to suit the ambient temperature has been a major challenge which is the focus of this research (Dougherty, 1993).

The objective of this research project is to design and construct an efficient automatic household electric ceiling fan that can auto- switch the fan regulator to control the fan speed to suit the ambient temperature.

This is different from a remote sensing device which will require the Manuel operation of the fan regulator using a remote control (jaeger, 2004). However, this device uses a temperature sensor which automatically controls the fan regulator switch to achieve the desired downward breeze. The temperature sensor is connected to variable resistors and comparator that will logically let out signals to the Ne555 timer monostable vibrator that in turn switches the relay. The speed of the fan blades respond to the signal from the temperature sensor by switching high when the ambient temperature rises and low when the temperature falls (Teratja, 2003). The Feedback from the temperature senor is set automatically to trigger the comparator which presents a logical output to variable resistors set in the conventional five speed fan regulator distribution. The fan therefor automatically adjusts to five different speed levels as determine by the ambient temperature

1.2 Aim and Objectives of the study

The aim of the study is to construction an Automatic cooling fan system.

The specific objectives of this study are:

To construct an automatic cooling fan system used as cooling system device to other electronics that require moderate for temperature

To the operation recommendation based on the outlined outcome of this research work.

1.3 Scope and Limitation of the study

This study only focus on the construction of automatic cooling fan system that could be used to cool small system or environment the major setback encountered in this work was to access the exact value of the component to assemble and fabricate this device.

1.4 Definition of Terms 

Construction: This is a process of building something (House, Motorways, Office block, bridges Factories etc).

Automatic Cooling Fan System: The fan system works by forcing air flow through the radiator, the fan system provides an efficient air flow and optimize the heat exchange to the radiator. It is usually located at the front of the vehicle, either in front or behind the radiator.