Reducing the use of conventional energy in agricultural production and food processing via using renewable energy is one of the key points to protect our environment. Solar radiation might be an excellent source for replacing traditional heat sources in drying technology. This study aims to analyze and investigate the efficiency of different solar radiation collectors to apply for agricultural products and food drying. Seven solar radiation collectors have been developed and manufactured for experimental investigation. The first is a flat plate solar collector. The second is a pipe collector covered by transparent polyethylene. The third is a copper pipe collector placed on the focus of a parabolic trough. The fourth is a glass pipe collector placed on the focus of the parabolic trough (Experimental testing with fluid is air). The fifth is a glass pipe collector placed on the focus of the parabolic trough (Experiment testing with fluid is water). The sixth is the pipe collector placed on the focus of the parabolic cylinder with no extent to the collector (the parabola is insulated). The last is the pipe collector placed on the focus of the parabolic cylinder with an extended collector (the parabola is insulated). The experimental investigation results indicate that the collector efficiency depends on the solar radiation intensity, the mass flow rate of heating receiver substances, and the structure of the solar collectors. The high solar radiation intensity generates high efficiency. The Pipe collector is placed on the focus of the parabolic cylinder with an extension of the collector (the parabola is insulated); the highest solar collector efficiency with 50.58% at the air flow rate is 0.218 kg/s while the Glass pipe collector placed on the focus of parabolic trough (Experiment testing with fluid is air) has the lowest efficiency as 4.55%.
Agricultural mechanization is an essential path to the industrialization of rural regions. Viet Nam has more than 40% of the population in the agriculture sector, contributing nearly 30% of the country's GDP and still is an agricultural country. Mekong River Delta (MRD) is the most significant agriculture production region of Viet Nam in which Vinh Long is one of sample province might be representative for MRD. This paper presents case study of recent status of mechanization in agriculture, and some recommendations for development the agricultural mechanization in the province. The statistical methods, SWOT analysis, problem approach and practical research have been used. The results indicate that the ratio of agricultural mechanization in Vinh Long might be not to satisfaction to the development of agriculture production. The agricultural field using walking tractors and shoulder engines, investment and financial policies, skill and training level of farmers and agricultural infrastructure such as rural transportation system, irrigation system, and agricultural production industrial processing are the main factors strongly influence on the development of agricultural mechanization in Vinh Long. Some studies proposed recommendations as solutions for sustainable development of the agricultural mechanization are presented in this study, such as agricultural production needs to be reorganized; developing system for training high quality and skill people to work in mechanization process; increase investments in science and technology for agricultural mechanization; setting up the policies to attract businesses and individuals invest in developing mechanization; removing blockages on "agricultural land limit" policy; and creating financial policies supporting to agricultural production investors.
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