Research Of Phase Change Materials Applied In Assembled Greenhouse

Our country has vast land and rich resources, but low per capital resources. We have been faced with two major problems of food and energy shortages. Greenhouse is achievements of our people achieved in long-term labor practice. In recent years, with the rapid development of agricultural facilities, Solar greenhouse as its most important component reached its peak of replacement, more and more scholars to join the solar greenhouse structure optimization,enhance research greenhouse insulation properties, Liaoshen Series, Northwest Series,Shandong series are the outcomes in the process of development. However, there are still flaws in Greenhouse of two aspects, the one is the prevalence of daytime heat remaining needs "leaked" out of need "hot fill" Night heat problems, the second is in Greenhouse agriculture as a temporary facility, which in the summer farmland idle time is not conducive to mechanical cultivation.The purpose of this study is to solve the conflict in Greenhouse structure building land with crops cultivated land and the prevalence contradiction of energy supply and demand in solar greenhouse in time and space. Using foam concrete insulation board as the back wall of greenhouse insulation materials, prefabricated combination detachable design, Prefabricated combination detachable design allows sunlight greenhouse can be removed in summer during idle reduction of arable land, the fall in production on the use of recombine period. The phase change material is introduced into the greenhouse and play the advantages of phase change heat storage. When the indoor temperature is higher than the material transformation point material from the solid to liquid at noon,absorb heat, reduce the indoor temperature. When the indoor temperature is lower than the material transformation point material from the solid to liquid at night, releasing heat, increasing the indoor temperature. The use of phase change materials can reduce solar greenhouse diurnal temperature, the rational allocation of heat,improve the utilization of solar energy.By comparison with other types of solar greenhouse wall heat transfer coefficient, and considering fabricated opera ability, this paper argues 150 mm thick foam insulation concrete wall can not only achieve the performance of traditional solar greenhouse, and easy construction operations. By calculate mechanical property of assembly phase change greenhouses and check with mechanical property of member,this paper argues the study by the prefabricated building in the node's "tongue and groove connection" approach inspired by column greenhouse wall- wall paneling cross connections, column and wall panels connected by irregularities connected to each other to limit displacement. Sectional shape of the back wall column design column, corner posts, side columns three types of beneficial connection between sunlight warm the wall. Through the phase transition temperature and normalglasshouse greenhouse temperature contrast. The phase change material can be obtained in the solar greenhouse temperature can act as a "load shifting" role. In sunny, 96.7% of the phase change material changes phase to reduce the peak temperature in Greenhouse. Rear air temperature average reduce 0.65?, the average air temperature in central decrease 0.45?; rear geothermal heating rate is reduced, the average ground temperature in middle lower 0.58?, the average temperature in the front reduces 0.87?. 90.4% of the phase change material undergoes a phase change temperature increase in Greenhouse valley.Rear air temperature average increase 0.65?, the middle of the average air temperature increase 0.8?; rear geothermal cooling rate decreases, the middle ground temperature average of 0.14?, the front of the ground temperature average of 0.96?.At last this paper account value of test assembly phase change greenhouse and according the value we proposed a cost analysis component factory mass production, and comparative price of traditional cold and warm shed provide economic analysis basis for follow-up study.