The Study On Heat Transfer Model And Experiment Of Thermal Storage Floor With Coil Heating

Rural energy problem has become an important factor which constrains the development of our economy and society. Solving this problem is not only involved in energy conservation and emissions reduction, but also the important content of socialist new rural construction. The rural heating energy consumption in winter accounts for a large proportion of the total energy consumption. Therefore, combining with the characteristics of rural energy, making reasonable use of resources is an effective approach to energy saving. Rural areas in our country are rich in solar energy, biomass resources and the advantageous conditions of making use of them. But there still remain the shortcomings of using intermittent and low utilization rate. Based on this point and combined with the rural area actual situation, this thesis mainly studies on the heat storage and release in utilizing the solar energy and biomass energy by designing buried coil-heat storage system on the floor and discusses the thermal performance by taking the methods of experimental research and calculation analysis, which can be adapted to the feature of long-time hot intermittent, high real-time, frequent adjustment and strong volatility so as to achieve the goal of comprehensive utilization of energy complement.First of all, based on the solar energy-ground source heat pump system as heat source in the laboratory of Dalian University of Technology, design and build the buried coil-heat storage floor experimental system. Moreover, based on three different conditions which are standard conditions, variable water flow velocity condition and variable water temperate conditions, thermal storage features of thermal storage floor is studied. Experimental results show that If using higher heat source temperature (40℃), thermal storage capacity than the working condition of low water supply temperature (35℃and30℃) increases by more than20%, and thermal dissipating capacity can increase more than50%; if using the larger water flow (500L/h) to experiment, the thermal storage capacity than the working condition of small flow (200L/h and350L/h) increases less than15%, and heat dissipating capacity of ascension in only about30%at most. As a result, if using the larger water flow rate and higher heat source temperature, heat storage system on the floor will show a good thermal performance. But it should be chosen depending on the application.Secondly, these theses further analyze the heat storage floor based on the heat storage floor for the establishment of mathematical model from the perspective of heat transfer. The internal temperature field of heat storage floor is emphatically analyzed. Compared with the experimental results, preliminary theoretical basis for design can be drawn by verifying the calculations.Finally, the storage floor size is limited which based on the actual application in the research and the predecessors’research results. Besides, heat source selection suggestions are given combined with the measured results of solar energy and biomass energy utilization. Based on the analysis of the experiment and calculation, the characteristic curves and equations of thermal storage floor are obtained. The study finds that surface heat storage and heat release capacity increases with the increase of the total quantity of heat and the increment is in larger trend, which means that the larger the supply storage is, the greater the thermal performance of the system will be. The results of simulation calculation and experimental results keep within±10%relative errors which verify that this model can be used in engineering design. Combined with the practical application of the thermal storage, finally the design process of thermal storage floor is proposed. This can provide the support for further research and application of regenerative heat system and to provide some guidance for practical engineering.