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Zhang Y.,Qingdao Agricultural University | Zhang Y.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | Xiu F.,Qingdao Agricultural University | Xiu F.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | And 5 more authors.
Journal of the Chinese Cereals and Oils Association | Year: 2014

Taking massive natural coldness resource storage in winter as the basis, the cooling effect of shade net, natural ventilation and mechanical ventilation have been studied in the paper. The optimum conditions for cooling are established as follows: black shade net 70 cm above the roof, natural ventilation at 14 p.m on daily basis, mechanical ventilation from 10 p.m to the next day 6 a.m by one-sided axial flow fans. Simulation of cooling effect by software Fluent 6.3 and cost evaluation have also consolidated the feasibility of wide application of autocycle heat pipe-based grain storehouse. Source


Zhang Y.,Qingdao Agricultural University | Zhang Y.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | Dong X.,Qingdao Agricultural University | Dong X.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | And 4 more authors.
Journal of the Chinese Cereals and Oils Association | Year: 2013

To obtain a new method of aflatoxin B1 degradation in agricultural products, the effects and influencing factors of aflatoxin B1 degradation were studied by using plasma through response surface methodology. The results showed that plasma had an excellent effect on aflatoxin B1 residue-degraded. The influence strength of the parameters was as: speed of power>application time>electrode distance. The optimum degradation technique of aflatoxin B1 was: speed of power 200 W, application time of 80 s, electrode distance of 3 cm, and the maximum degradation rate reached 51.67%. Source


Zhang Y.,Qingdao Agricultural University | Zhang Y.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | Jiang W.,Qingdao Agricultural University | Jiang W.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | And 4 more authors.
Journal of the Chinese Cereals and Oils Association | Year: 2014

Considering the current problem for grain storage, namely, the generally adopted chemical fumigation in insect prevention and noisy cooling system of high energy consumption failed to satisfy the great demands for high-quality green grain storage, a set of heat pipe-based low temperature grain storage system was designed. With the wheat as the experimental subject, in winter the cold resource was obtained through the heat exchange between the condensing section of the heat pipe and reserved by the evaporating section of the heat pipe absorbing the heat of wheat. The results showed that the heat pipe-based low temperature grain storage system was capable of automatically introducing the natural cold resource in winter into grain storage without any energy consumption or stuff on duty. The temperature of gains could be lowered to 1℃, being far lower than the level of quasi-low temperature of grain storage, i.e., 20℃. The speed of temperature decrease could reach 0.2℃/d. The results of this research offered effective support for large-scale grain storage in a green way. Source


Dong X.,Qingdao Agricultural University | Dong X.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | Zhang H.,Qingdao Agricultural University | Zhang H.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | And 4 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

To obtain a new method of pesticide residue degradation in fruits and vegetables, the effects and influencing factors of fenpropathrin residue degradation in Shandong Chengyang Cyan Chinese cabbage were studied by using plasma through response surface methodology. The results showed that plasma had an excellent effect on fenpropathrin residue-degraded in Chinese cabbage. The degradation rates were all more than 70%, and the influence strength of the parameters was application time> power> electrode distance. The optimum residue degradation conditions of fenpropathrin were application time 30 s, power 200 W and electrode distance 3 cm, and the maximum degradation rate was 98.78%. This paper provide a reference for pesticide residue degradation in fruits and vegetables. Source


Xiu F.,Qingdao Agricultural University | Xiu F.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | Zhang Y.,Qingdao Agricultural University | Zhang Y.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | And 6 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2013

To solve problems occurring in grain storage such as high-energy consumption, uncontrollable insect pests, and serious pesticide pollution, a heated, pipe-based grain storehouse utilizing natural cold resources was developed. The heated pipe-based grain storehouse is composed of a storehouse, heat pipe, and temperature monitoring system. The working substance in the evaporation section of the heat pipe absorbs heat from the grain, gasifies it, and then releases the heat via heat an exchange with cold air in the condensation section of the heat pipe. The liquefied working substance then flows back to the evaporation section via gravity. An automatic cycle is accomplished in this manner. The natural coldness resource is continuously transferred and stored in the grain, and low temperature grain storage is achieved. In this study, from December 2011 to November 2012, the distribution and variation of the temperature of grain storehouses were measured and analyzed. The insect pest inhibition effect was also studied. Results showed that the heat pipe was in operation for 91 day, in which the temperature was 2.2°C lower than that of traditional grain storehouses, and the average wheat temperature of the heat pipe-based grain storehouse decreased to 0°C within 19 days, reaching the minimum of -3.17°C. In this period, its heat exchange was 50.95 MJ and the cooling rate was 0.28°C/d, which were respectively 31.62% and 47.37% higher than that of conventional grain storehouses. Natural cold resources more rapidly transferred into the heat pipe-based grain storehouse. The average wheat temperature of the heat pipe-based grain storehouse had been below 15°C before May 2012, in accordance with the widely accepted temperature requirement for low temperature grain storage. The occurrence of insect pests in the heat pipe-based storehouse was delayed and the insect pest density was lowered. Thus, the insect control effect was significant. In addition, no moisture condensation or mildew occurred during the experimental period. In summer, the average wheat temperature of heat pipe-based grain storehouses was 2°C lower than that of traditional storehouses. Heat pipe technology proved to be applicable and efficient in grain storage in temperate and cold regions. With low energy consumption, low cost, high cooling rate, and good insect pest control effect, the storehouse could remarkably maintain grain quality in an environmentally friendly way. Considering the high surface area of grain storehouses in this research, the cooling effect and reserved cold resources could be greater when put into practice in large grain storehouses. This research provides the theoretical foundation and technical support for the practical application of heat pipe technology in large grain storehouses. Source

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