DESIGN AND CONSTRUCTION OF A PYRAMID SHAPED SOLAR

ABSTRACT

There is almost no water left on earth that is safe to drink without purification after 20-25 years from today. This is a seemingly bold statement, but it is unfortunately true. 1% of Earth’s water is in a fresh, liquid state, and nearly all of this is polluted by both diseases and toxic chemicals. For this reason, purification of water supplies is extremely important. Keeping these things in mind, we have devised a model which will convert the dirty/saline water into pure/potable water using the renewable source of energy (i.e, solar energy). The basic modes of the heat transfer involved are radiation, convection, and conduction. The results are obtained by evaporation by evaporation of the dirty/saline water and fetching it out as pure/drinkable water. The designed model produces 2.5 litres of pure water from 20 litres of dirty water during twelve hours. The efficiency of both plant is 64.37%.

TABLE OF CONTENTS

TITTLE                                                                                          PAGE

APPROVAL PAGE……………………………………..…..………..I                                                                                                                                                                                                                                 

DEDICATION………………………………..…………...………….II                                                                                                  

ACKNOWLEDGEMENT………………………………….…………III                                                                                                                               

TABLE OF CONTENT…….…….…………………………..…..…..IV   

LIST OF FIGURES ………………………………………………….VI

ABSTRACT ………………………………………………………....VII

 CHAPTER ONE

1.1 INTRODUCTION                                                                                                                         2

1.2 STATEMENT OF PROBLEM                                                                                     3

1.3 AIM AND OBJECTIVE                                                                                                               4

1.4 SIGNIFICANCE OF THE STUDY                                                                              4

CHAPTER TWO:

LITERATURE REVIEW                                                                                                       4

2.1 INTRODUCTION                                                                                                                   4

2.2 REVIEW OF PREVIOUS WORK ON SOLAR DISTILLER    5

2.3 RELATED THEORY                                                                                                          7

CHAPTER THREE:

3.1 MATERIALS USED                                                                                                    9

3.2 METHOD                                                                                                                           10

CHAPTER FOUR:

4.1 RESULTS AND DISCUSSION                                                                             14

CHAPTER-FIVE:

5.1 CONCLUSION AND RECOMMENDATIONS                                      23

5.2 REFERENCE                                                                                                                             24

LIST OF FIGURES                                                                                                 

Figure 2.1: Experimental Set up of Solar Still                                                          5

Figure 2.2 diagrammatic sketch and general dimensions of Pyramid solar still.     6

Figure.2.3 Single Slope Still                                                                                                          6

Figure 3.1: pyramidal and triangular solar shaped still                    10

Figure 3.2:  A typical thermoelectric Pyranometer                                              12

Figure 3.3: An Anemometer                                                                          12

Figure 3.4: thermocouple thermometer                                                                                  13

Figure 3.5: graduated cylinder                                                                           13

Figure 4.1:           temperature of glass and water for both stills                                      18

Figure 4.2: Triangular solar still (water and glass temperature)    19

Figure 4.3:           Pyramidal solar still (water and glass temperature)                           20

Figure 4.4: cumulative and specific yield for both still                                       21

CHAPTER ONE

1.1 INTRODUCTION

Distilled water is needed for drinking, irrigation and for many other applications. A diversity of approaches are used for these portions of fresh water from saline water; namely multi stage flash (MSF), multiple effect (ME), reverse osmosis (RO), electro dialysis, ion exchange, phase change, and solvent extraction. These methods are expensive, however, for the production of small amount of fresh water. The development of solar distillation has demonstrated its suitability for the desalination process when the weather conditions are suitable and the demand is not too large, i.e. less than 200 m³/d. The problem of low daily productivity of the solar stills triggered scientists to investigate various means of improving the stills productivity and thermal efficiency.

Different aspects of triangular-shaped solar stills (CSS), also called double slope stills, have been studied. Production in this still is influenced by the orientation, as shown by (Singh et al., 1995) who found the maximum yield for a cover with east–west. Detailed studies of heat transfer coefficients can also be found, (Sharma and Mullick, 1991), in which energy transfer mechanisms, such as convection, evaporation and radiation are investigated, and new empirical relations to estimate cover temperatures are proposed. To model heat and mass transfer in solar stills ( Dunkle, 1961)  proposed the use of a correlation of the form  where C is 0.075 and n is 1/3 for air enclosed between horizontal parallel plates. This correlation is expressed in terms of a modified temperature difference that includes molecular weight and buoyancy, and considers the cover as a single element. This has been the most widely accepted model for solar stills and describes the basic heat and mass transport mechanism between heated water mass and a condenser.

1.2   PROBLEM DESCRIPTION AND SIGNIFICANCE

Many parts of the world do not have access to a suitable source of clean drinking water. Most of the water available in streams, lakes, rivers, sea, etc. carries parasites or diseases, or is simply not fit for consumption and therefore is a significant health hazard. Areas without access to clean water are also usually poverty stricken and do not have the infrastructure necessary to create and support large scale water purification plants. Thus, there is need for a small scale, affordable water purification system for individual families or villages. Africa has the second largest population of people without access to clean drinking water.

1.2   AIM AND OBJECTIVES

a.     The aim of this project is to construct pyramid-shaped solar.       

b.     To compare and evaluate the triangular and pyramid-shaped solar stills.

1.3 SIGNIFICANCE OF THE STUDY

The energy from the sun used to distil water is free cost, but building the still makes the cost of the distilled rather high, water at least for large-scale uses and such as agriculture and flushing away wastes in industry and homes. Consequently, the solar still is used principally to purify water for drinking and for some business, industries, laboratories, and green house applications; it also appears to be able to purify polluted water.

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