Research Of Solar Energy Conserving System In Soil For Active Greenhouse

Aiming at the problems of lower soil temperature, which restrains plant develop in greenhouse in wintertime, with the technology of solar energy conserving in soil, it is the paper that introduces a system which is able to store solar energy in soil by a collecting and storing unit of solar energy. The system is able to efficiently increase temperature and meet crop requirement of temperature for yield.In researching and designing solar energy conserving system in soil for active greenhouse, it adopts instrument of RHLOG, tests temperature of six layers to soil temperature, and draws various curve of temperature. It shows the system can efficiency increase soil temperature and reduces change range of temperature in greenhouse in wintertime.It presents a mathematical heat transfer model of air and soil temperature in greenhouse basing on the theory of transmission of heat. The model calculates the heat diffuse coefficient of soil by difference method and establishes regression equation on experimental data by SAS. Taking into consideration of the factor include heat diffuse coefficient of soil and time, which affect soil temperature of differential deep, the model can calculates temperature of any time in different depth. The research declares that the simulation result shows good agreement between the calculate values and measured data, and the equations can afford means and evidences for further analyzing of the heat transfer topics on soil in greenhouse.Using the calculating method of the quantity of heat in modern greenhouse, the heat balance equation of greenhouse is set up. It is confirm that optimizing the areas rate of solar collector to culture field is 1:5. The experiment indicates the rate is able to meet crop requirement of yield all the year roundThe research accomplishes the goal of storing solar energy in summertime and utilizing in wintertime, storing in daytime and utilizing in nighttime, storing in sunshine and utilizing in cloudy sky. In condition without raised temperature by other ways, it can meet crop requirement of yield entire year. It is the system that holds effective approach to raise the temperatures inside the greenhouse with the features of saving energy and environmental protection.