ABSTRACT
Four sweat boxes were constructed
using wooden material (IO x 10 x 35) (LWH) and hoisted 4 electric bulbs of 100,
200, 300 and 400 watts respectively on the boxes. Cocoa been sorted into four
different grain sizes of coca into samples (A, B, C, D), then subjected to
drying until 13- 14% moisture content was reached. In another instance two
hundred grams of the various sample sizes were also dried in oven, solar dryer
and sun. During the drying, the moisture loss was detennined; humidity and
temperature were also monitored hourly. The moisture loss was significant among
the cocoa sizes and ranged between 86.50 g- 114 g for 400 watts, the moisture
loss was least 49.9 g in sample B for 100 watts heat source. The least j
effective method was oven drying which bad 13.17 g moisture loss after 17 hours
drying. The humidity was highest in the oven at 74.94% while the least was
61.94% on the solar drier 400 and 300 watts sweat boxes was the most effective
in terms of time-economy at 6 hours. Sweat boxes can effectively be used during
rainy season for cocoa drying.
TABLE OF CONTENT
Title PageCertification
Dedication
Acknowledgements- -
Table of contents
List of tables- -
List of figure- -
Abstract -
CHAPTER ONE: Introduction
1.0 l3ackground -
1.1 Statement of Problemii
iii
iv
V
VII
viii
X
l.2 Justification1.3 Objective of Study -
CHAPTER TWO: Literature Review
2.0 Overview of the Study- -
2.1 Cocoa J>rocessing--
2.1. I Fcrrncnlalion (Curing)- -
2.2 Drying2.3 Factors Affecting the Rate of Drying Cocoa Beans2.3.1 Particle Sizes EfTcct - -
2.3.2 Moisture Content Effect2.3.3 Heal Source Effect -
3
3
4
5
7
7
8
16
17
17
17
V
2.3.4 Thermodynamic Properties Of Drying Environment - -
CHAPTER TIIREE: Materials and Methods
3.1 Material and Methods -
3. I. I Description of Sweat Box-
:t 1.2 Projected Swenl 3ox- -
3.1.3 Design Consideration3.2 Experimental Procedure3.3 Data Analyst's--
CHAPTER FOUR:
4.0 Result and DiscussionCHAPTER FIVE
5.0 Conclusion and Recommendation5.1 Conclusion5.2 Recommendation--
REFERENCES
18
20
20
24
24
25
26
27
55
55
56
vi
LIST OF TABLES
Table 3.1 The grads of the different particle sizes- 25
Table 4.1 Moisture loss, change in temperature, average rclalive humidity
and drying lime or cocoa bean (sample A)- 28
Table 4.2 Comparison or drying efficiency of deferent drying method with
respect to cocoa bean (sample B)- 34
Table 4.3 Comparison of drying efficiency of deferent drying method with
respect to cocoa bean (sample C)- 40
Table 4.4 Comparison or drying cniciency of deferent drying method with
respect to cocoa bean (sample D)- 46
Table 4.5: Summary of the efficiency of the sweating boxes- 52
vii
..
LIST OF FIGURES
Figure 2.1 ~ A diagrammatic illustration of heat transfer on seed plants- -
figure 3.1: orlhogrnphic projection of the sweat boxFigure 3.2: the exploded isometric view of the sweat boxesFigure 3.3: The components parts of the sweat box14
21
22
23
Figure 4.1:
Figure 4.2:
Figure 4.3:
figure 4.4:
Figure 4.5:
Figure 4.6:
Figure 4.7:
Figure 4.8:
Surface plots showing the effect of temperature and
humidity on the drying of sample A of cocoa beans--
Surface plots showing the effect of temperature and
time on the drying of sample A of cocoa beansSurface plots showing the effect of humidity and
time on the drying of sample A of cocoa beansRate of moisture loss by sample --A at different power
Ratings of the sweating Box- -
Surface plots showing the effect of temperature and humidity on the
drying of sample B of cocoa bcans- -
Surface plots showing the effect of temperature and
time on the drying of sample B of cocoa beansSurface plots showing the effect of humidity and
time on the drying of sample B of cocoa beansRate of moisture loss by sample -B with time di ffercnl power
ratings of the sweat box30
31
31
32
36
37
37
38
viii
Figure 4.9: Surface plots showing the effect of temperature and humidity on
the drying of sample C of cocoa beans- 42
Figure 4.10: surface plots showing the effect of temperature and time on the
drying of sample C of cocoa beans- - 43
Figure 4.11: surface plots showing the effect of humidity and time on the
drying of sample C of cocoa beans- - 43
Figure 4.12: Rate of moisture loss by sample-Cat different power
ratings of the sweat boxes- 44
J
Figure 4.13: Surface plols showing the effect of temperature and humidity •· ¢
on the drying of sample D of cocoa beans- - 48
figure 4.14: Surface plots showing the effect of temperature and time on the
drying of sample D of cocoa beans- - 49
Figure 4.15: Surface plots showing the effect of humidity and time on the drying
of sample D of cocoa beans- - 49
Figure 4.16: Rate of moisture loss by sample -D at different
power ratings of the sweat boxes- 50
NWACHUKWU, G (2023). The Effects Of Grain Sizes And Heat Sources On The Drying Profile Of Cocoa Beans. Repository.mouau.edu.ng: Retrieved Sep 08, 2024, from https://repository.mouau.edu.ng/work/view/the-effects-of-grain-sizes-and-heat-sources-on-the-drying-profile-of-cocoa-beans-7-2
GODSON, NWACHUKWU. "The Effects Of Grain Sizes And Heat Sources On The Drying Profile Of Cocoa Beans" Repository.mouau.edu.ng. Repository.mouau.edu.ng, 28 Jul. 2023, https://repository.mouau.edu.ng/work/view/the-effects-of-grain-sizes-and-heat-sources-on-the-drying-profile-of-cocoa-beans-7-2. Accessed 08 Sep. 2024.
GODSON, NWACHUKWU. "The Effects Of Grain Sizes And Heat Sources On The Drying Profile Of Cocoa Beans". Repository.mouau.edu.ng, Repository.mouau.edu.ng, 28 Jul. 2023. Web. 08 Sep. 2024. < https://repository.mouau.edu.ng/work/view/the-effects-of-grain-sizes-and-heat-sources-on-the-drying-profile-of-cocoa-beans-7-2 >.
GODSON, NWACHUKWU. "The Effects Of Grain Sizes And Heat Sources On The Drying Profile Of Cocoa Beans" Repository.mouau.edu.ng (2023). Accessed 08 Sep. 2024. https://repository.mouau.edu.ng/work/view/the-effects-of-grain-sizes-and-heat-sources-on-the-drying-profile-of-cocoa-beans-7-2