Study On Solar Greenhouse Coubled With The Buring-cave Soil Heating System In The Northern China

The research object was solar greenhouse of grape cultivation in the northern china. Viticulture solar greenhouse technology is mainly to create suitable for crop growth of light, temperature, water, soil and other environmental factors. For greenhouse production, the light and temperature of greenhouse is the main environmental factors which restrict the development of the greenhouse. In order to regulate the indoor environment, currently the solar greenhouse temperature accounts for50%～60%of the total expense in northeast, northwest cold area. For greenhouse production to save energy, improving energy efficiency, reducing energy consumption is a important way to improve benefit of greenhouse production. Considering the solar greenhouse region are widely distributed, large number of applications, operation time is long, etc, for the solar greenhouse temperature compensating measures for improvement and innovation is the key way for the technical transformation of the grape cultivation greenhouse in northern china and updating. How to reasonable design for different regions, build appropriate greenhouse environment requires in-depth research and discussion, which provides scientific basis for the greenhouse environment control, on experimental study and theoretical study, this paper mainly discussed the following problems:First of all, the paper analyzes the main influencing factor of the solar greenhouse lighting performance. Scientific understanding of the light intensity distribution in greenhouse, systematically analyzes the various surfaces of the soalr greenhouse light intensity and the relationship between the greenhouse structure. This study found that affect greenhouse main factors influencing the performance of the overall lighting is an inclined plane and horizontal plane angle, slope length, toward the solar greenhouse.Secondly, we design and build solar greenhouse coubled with the buring-cave soil heating system and do experimental research on it.Through building the buring-cave soil heating system, electric heating system, heating system without taking any heating facilities system under different operation condition of soil temperature and air temperature tests,the buring-cave soil heating system(soil and water) and not take any heating facilities system (soil not add water), improves the soil average temperature of5～6℃during the day, soil temperature3～4℃during the night. Solar greenhouse coubled with buring-cave soil heating system in the running process of soil temperature is more stable and solar greenhouse coubled with the buring-cave soil heating system during the daytime can increase the average temperature of4℃or so;Thirdly,we evaluated solar greenhouse coubled with the buring-cave soil heating system’s plants on the temperature and humidity of the air and soil, CO2concentration, lighting and other aspects of the thermal comfort. And we build solar greenhouse indoor air mass energy balance, indoor humidity balance equations, crop canopy balance equation, ventilation model, it is concluded that the thermal comfort of plants balance equation. Thermal comfort equation reflects the plants are in a state of balance, affecting thermal comfort of ten facters, LAI, CO2concentration, outdoor wind speed variable vo,Qp,△Wi,to,ti palisade structure surface temperature t, Ep,quantitative relationship;Finally, in view of solar greenhouse coubled with the buring-cave soil heating system, using energy saving rate, cost present value, cost, value, investment payback period of qualitative evaluation of the efficiency of the system. The system energy saving rate was46.14%, the cost present value and cost in value, respectively, compared with buring-cave and underground heating exchange system of solar greenhouse is lower23.95%and23.98%, lower than the hot air heating system56.99%and57%, hot water heating systems that are lower than38.2%and38.26%, lower than the electric heating system71%and71.05%.To sum up, solar greenhouse coubled with the buring-cave soil heating system can improve the comfort of greenhouse plants. This research work on solar greenhouse lighting performance and buring-cave soil heating technology has provided the scientific and theoretical basis.