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Study on Cold Storage of Rice in a Flat Bin
This study is focused on the storing characteristics of a flat bin with concrete base located at Tien-Chung warehouses, the Changhua farmers' association. This bin, previously equipped with a naturally ventilating system, was then replaced by a closed cooling system for experiment. The effects on the rice quality will then be examined and studied as follow:
For the empty (no load) condition, an airflow rate of 9.28 m3/ton-hour was measured, which fairly meets the requirement for a cool storage of paddy. Only less variations of temperature distribution inside the empty bin were found at the beginning and the temperatures at each checkpoint became steadier as the bin further regains ambient heat.
At the front of entrance, the ambient air was constrained in small holes and can only enter at a less speed. The wind speed at the rear end will be 2.3 times higher than that at the front The surface wind speed is found linearly related to the distance from the front end, with an correlation coefficient of 0.84.
For the experiment with paddy in a cooling storage, the temperature of grain at the bottom level has shown less decreasing, which reveals that the airflow is comparatively lower in this section. At the start of cooling process, it requires a longer cooling period to get rid of more heat. Throughout the experiment, the temperatures of grain have changed dramatically. The reasons are that the cooling process has been performed in an intermittent manner and the grain surface was not even spread well to get an even grain depth.
As to the grain quality during the storage, it has exhibited an obvious change in moisture content, it changes greater for the second period than for the first one. However, the result of constant samplings shows that the germination rate and milling rate of paddy does not have any significant difference from the conventional one, which concludes that paddy stored in a closed cooling bin can maintain its good quality.
|Appears in Collections:||生物產業機電工程學系|
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