What are the advantages of sun drying of cocoa beans than mechanical drying?
What are the advantages of sun drying of cocoa beans than mechanical drying?
Sun drying is reported to be optimal for producing the best flavour in fermented cocoa beans. This is due to the low temperature and sufficient drying time for cocoa to dry evenly which leads to chocolate flavour development [40] . …
What are the components of a solar dryer?
It comprises four components: a drying chamber, a solar energy air heater, a fan, and ducting to transfer the hot air from the collector to the dryer. In this design, the crop is located on trays or shelves inside an opaque drying chamber, which does not allow the solar radiation to reach the product directly.
How are cocoa beans graded?
Cocoa shall be graded on the basis of the count of defective beans in the cut test. Grade I – (a) mouldy beans, maximum 3 per cent by count; (b) slaty beans, maximum 3 per cent by count; (c) insect-damaged, germinated, or flat beans, total maximum 3 per cent by count.
How is solar dryer efficiency calculated?
The quantity of moisture evaporated from the dried material may be calculated from the following relation ? ? = ? ? ? ? − ? ? 1 − ? ? . ( 3 ) The efficiency of the air collector may be calculated from the following relation ? ? = ? ? H R ⋅ ? ? .
Why do we dry cocoa?
Drying is also responsible for reducing the acidity of cocoa beans and should be conducted in such a way as to obtain a moisture content of approximately 7%. Excessive drying can make the shell brittle, whereas excess moisture favors fungal development.
How do you dry cocoa?
2. Cocoa Drying Methods
- 2.1. Open Sun Drying.
- 2.2. Solar Drying.
- 2.3. Oven Drying.
- 2.4. Microwave Drying.
- 2.5. Freeze Drying.
Why is direct solar dryer harmful for food?
Why is direct solar dryer harmful for food? Explanation: A major problem with a direct solar dryer is that it can harm the food. This is because the sunlight could chemically alter some food item and make them less appetizing. Contamination due to wind is also a problem but it is not as bad as chemical alteration.
How can I increase the efficiency of my solar dryer?
PCMs store the thermal energy during sunshine hours and release it after sunset, which can reduce the heat losses and improve the thermal efficiency of the drying system.
What are the characteristics of good cocoa beans?
The best beans quality is on the 4 and 5 days of fermentation which produces an optimum temperature of around 45-47°C, pH around 5-5.4, total acid around 0.90%. Cocoa beans with a physical appearance and color that is bright enough, fat content around 50.45 %, and the water content is quite low around 4.97%.
What is slaty cocoa bean?
Slaty bean. A cocoa bean whose internal surface exposed by a cut is uniformly slaty grey indicating that the bean has not been fermented.
What is a passive solar still?
In the design of a passive solar still, the solar energy directly falls on the surface of a basin and heats the water; in a passive solar device the heat of the sun is the only source of energy increasing the temperature of the water to promote the process of evaporation; thus, this phenomenon leads to lower …
How long do cocoa beans take to dry?
five to ten days
Drying cocoa beans takes five to ten days.
Can a solar dryer be used to dry cocoa beans?
To the best knowledge of the authors, study on drying cocoa beans using a solar dryer integrated with thermal energy storage has not been reported. This paper deals with solar dryer integrated with thermal energy storage for drying of cocoa beans.
A prototype solar dryer has been fabricated and used in experiments. The solar dryer is shown in Fig. 1 (a). It consists of three main components: drying chamber; solar collector; and thermal energy storage. The drying chamber is a room with dimension of 50 cm×50 cm×50 cm.
What are the effects of drying cocoa beans?
Variations of these drying parameters impinge significant effects on moisture content, bean colour, pH, fatty acids, polyphenols, methylxanthines, proteins, and aromatic compounds that constitute outstanding quality parameters (Tables 1 (a)– 1 (d)) [ 6
What is the meaning of continuous solar dryer?
The meaning of continuous term here is that during sunshine hours and off-sunshine hours the drying process is uninterrupted. In all experiments, temperatures, mass of the cocoa beans, relative humidity, wind velocity, and solar radiation were recorded every minute.