Abstract
In the present study two local cultivars of paddy (long and medium grain size) were dried in thin layer by three different methods included indirect active solar dryer, mixed-mode active solar dryer and continuous dryer, at three temperature levels of 35, 45, and 55℃. Also, paddy was dried by sundry method as the traditional and common used method (control treatment). Energy consumption for different parts of aforementioned dryers was practically determined. Total drying energy per kilogram of dry mass of head rice yield (specific energy consumption) was calculated. Results indicated that medium size grains result more head rice yield than longer ones. No significant difference was observed for head rice yield form indirect and mixed-mode solar drying. Drying temperature significantly influenced on head rice yield and the specific energy consumption, so that the lowest ratio was obtained at 35℃. Considering low specific energy consumption and drying time duration, continuous dryer acted more efficient than others.
Highlights
IntroductionAccording to the FAO reports, nearly 161 million hectares were under cultivation of rice with the total yield of 679 million tons in the world in year 2013, and ranked at second place after maize
Rice is one of the main food sources in the worlds people diet
Analysis of variance on Head rice yield (HRY) values showed that the cultivar, drying air temperature and drying method and their interctions significantly influenced the HRY (P
Summary
According to the FAO reports, nearly 161 million hectares were under cultivation of rice with the total yield of 679 million tons in the world in year 2013, and ranked at second place after maize. It ranked after barley and wheat at third place in Iran [1]. Drying as one of the main and of necessity processes has critical effect on the quality of final product. For optimum head rice recovery in rice milling process the moisture content of paddy should be within the range of 10 to 13% w.b. For optimum head rice recovery in rice milling process the moisture content of paddy should be within the range of 10 to 13% w.b. [2, 3]
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