Research On Insulation Structure Of Underground Heat-storage Concrete Pile

Solar energy storage technology is the key part of solar utilization,and have been applied in some countries. Existing domestic and international solar thermal methods are mostly using underground artificial storage tank, natural soil(rock) to save energy. But these methods are limited due to geological conditions, can not do underground insulation and seepage, which lead to severe heat loss, low efficiency of energy storage, etc.. The flaw affects the efficient use of solar energy and underground thermal storage technology applications. Therefore, the promoting of underground energy storage urges its affiliation of insulation system. The dissertation focuses on the Insulation Structure which based on the work of previous research. It dedicates to design a rational insulation structure to reduce the energy losses which resolves the problem of heavy energy loss of underground storage mass.We preliminary designed several insulation structures which design based on the integral and economic principles and the characteristics of underground energy storage. Comparative studied different insulation temperature distribution with ANSYS.Checked the insulation effect after several insulation experiments. Proposed the optimized insulation structure after the analysis of experimental and analysis data.And draw the following conclusions on the analysis of the whole work.1) The curves which produced by ANSYS post-processor shows that the heat storage capacity of the pile has greatly improved after been insulated, and the effect of different thermal insulation structure varies greatly; and the period of thermal preservation lasts twenties hours longer by using polyurethane instead of mineral wool, that is the insulation effect enhanced by 70% or more when the temperature is proper and the same insulation thickness.2) The composite insulation structure of rock wool and polyurethane works well,we can draw the conclusion that the insulation structure reached the expected effect which designed by economic designation by the experimental data of 1# and 3# samples.3) The comparison of the data from the experimental and simulated curve indicated that when the temperature is proper, the data of thermal analysis which gained by ANSYS is acceptable and can be great help with the experiment.4) The preservation period of 1# sample, which constructed by economic thickness design, hugely extended. 5) The experimental and simulation data of sample 2# and 6# are quite different. The reasons is the rock wool layer is too thin, causing the temperature of polyurethane inner circle over the using temperature which damaged the insulation structure. Therefore, the temperature of transit zone of insulation structure should be strictly controlled.6) Using the optimized insulation structure will reduce heating costs 5076 Yuan per year and needs 6.6 years to profit from it.