Structural Optimization And Pool Research Of Fish-culture Greenhouse

Structure optimization and pool boundary research of fish-culture greenhouseThe thesis is the sub-project of the task named "the studying on generalized development and usage of Harbin fish-culture greenhouse supported by straw gasified gas and accessories" which is the scientific research project of Heilongjiang province. We wish to provide theoretical basis for optimizing greenhouse structure, studying heat-transfer cycle and optimizing structure of pool bottom and wall by theoretical study and experimental analysis.The experimental place of this thesis is the fish-culture greenhouse supported by straw gasified gas which located in wuyi country. XinFa town, DaoLi of Harbin. WuYi country lies in the south of Songhuajiang and the north of Changlin Lake, so its natural water is abound. The farmers in the area had the custom of culturing fish for many years and accumulated a lot of fish-culturing experience. With bettering of Chinese people's living condition, the quantity of requirement for qualified fish is increasing and there are many fishing-lovers who can't find fishing ground to fish in winter in Harbin. The thesis is developed to point to these two problems. Heilongjiang is very cold in winter and the distinction between the weather is high. The main problem of culturing qualified fish in fish-culture greenhouse supported by straw gasified gas is energy economy. We settle the problem of energy economy mainly using the following methods. One method is to use solar energy resources as much as possible. Another method is to use heat insulating measure to diminish heat loss.We work out a heat-demand mathematical model of greenhouse system in winter by basic principle of solar radiance and knowledge of advanced math and get heat acquirement and heat loss of greenhouse system by running program of visual basic in this thesis, so that we can deduce the relationship between heat acquirement and heat loss of greenhouse system and make clear the connection of greenhouse lighting surface's angle with greenhouse heat demand. As the matter of result, we can seek a practical and economical greenhouse structure. At the same time, we apply the basic principle of finite element method to establish the relative mathematical models which we can use to get temperature field of pool bottom and pool wall and we calculate the temperature field and the quantity of ground pipe's heat input and find out the regulation of typical spot temperature's varying with time, so that we can get thermal transmission regulation of pool bottom and pool wall in different cases. By practically temperature-measuring and operating of fish culture greenhouse supported by straw gasified gas in WuYi country, Harbin and by comparing between calculating result and measuring data, we draw conclusion that the optimizing method and mathematical models established in the thesis have good effect and can provide theoretical help for further study of greenhouse optimizing and temperature fields of pool bottom and pool wall and have some reference fordevelopment in Heilongjiang fish-culturing industry.