Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering

Qingdao, China

Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering

Qingdao, China
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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.


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.


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.


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%.


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.


Liu J.,Qingdao Agricultural University | Liu J.,Qingdao Key Laboratory of Modern Agricultural Quality and Safety Engineering | Xiong X.,Qingdao Aoweikang Biological Engineering Technology Co. | Wang S.,Qingdao Agricultural University | And 5 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2016

In order to reduce Freon refrigerant's damage to the ozone layer and its high potential value of climate warming, an accumulation of cold source device by the detached low temperature heat pipe was designed. The heat pipe cold storage device was composed of a reservoir, heat pipe, and temperature monitoring system. The refrigerant absorbs heat from the reservoir in the evaporation section of the heat pipe followed by its gasification. After that the exchanged heat and release of latent heat of vaporization with cold air in the condensation section of the heat pipe occur followed by liquefication of refrigerant. The liquefied refrigerant flows back to the evaporation section of the heat pipe by the action of gravity. As such an automatic cycle is accomplished in this way. With continuous progress of the gasification and liquefaction for the refrigerant, the coldness resource is continuously transferred and stored in the reservoir, and the temperature of reservoir gradually decreases. In this study, we replaced the traditional refrigerant R-22 with a new type of fluorine free refrigerant HCR-22, taking cold storage capacity as an index, and conducted an experiment for 70 h. We studied the cold storage effects of two kinds of refrigerant in different liquid filling ratio and condensation/evaporation section area ratio. The test results showed that the best filling ratio of HCR-22 for low temperature heat pipe was 80%, which was the same as R-22. When the heat pipe module was running 70 h, the cold storage capacity of refrigerant HCR-22 was higher, and the cold storage capacity of HCR-22 and R-22 were 16 230.52 and 16 252.09 kJ, respectively. Under the condition of best liquid filling, HCR-22 for low temperature heat pipe of the optimal condensation/evaporation section area ratio was 2.8:1, less than 3:1 with the R-22. Obviously, the use of HCR-22 refrigerant can save more metal materials. The heat transfer stability of HCR-22 and R-22 was the same in the phase change heat transfer, and the temperature variation was smooth in the test process, but the amount of refrigerant used by HCR-22 was only 1/3 of the R-22. Being an environmentally friendly and nature refrigerant, HCR-22 was composed of carbon and hydrogen, fluorine free, and found to have zero ozone depletion potential and lower global warming potential. If the natural cold source was chosen in the middle or high latitude winter, the detached low temperature heat pipe used in this experiment may lead to the process of cold storage with low energy consumption, and low economic and environmental costs. The achievement applied in grain storage can reduce the energy consumption and the cost of refrigeration equipment with green grain storage at low temperature accomplished. This study provides evidences and technical support for the new type refrigerant HCR-22 replacing the traditional refrigerant R-22 refrigerant, and provides protection for the popularization and application of low temperature heat pipe. © 2016, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.

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