The Investigations Of Self-deicing&Snow-melting System Of CNFP-based High-efficient Thermal Source

In winter, there is a large amount of ice and/or snow covered on the highway,airport, bridge and pavement frequently in the cold region of temperature belowzero. It not only seriously blocks smooth running of these traffic facilities,endangers people’s lives and property security, and causes great national economiclosses. But also affects the normal operation of the national defense construction,such as military airport, railway and warship deck, which may be a very potentialhazard in war period.As the traditional snow-melting and deicing methods, the mechanical methodscould not be used widely due to the limitations of low efficiency and hysteresisquality. As a marked representation of chemical salts methods in deicing and/orsnow-melting applications, calcium chloride have been extensively used insnow-melting and/or deicing of practical transportation system, though. But it islimited because of the disadvantages environmental pollutions, concrete andreinforced corrosion. In order to ensure sustained development of national economy,the smooth running of transport infrastructure and the security of people’s life andproperty, it is pretty necessary and significant to develop a novel, high-efficient andfeasible road snow-melting and deicing technology. There are four parts works willbe processed in this dissertation:(1) Based on the high-efficient electro-thermal property and thermal stability ofCarbon nano-fiber paper (CNFP), the remarkable heat conduction property ofMulti-walled Carbon nano-tubes (MWCNT), the road deicing/snow-melting systemwill be integrated to study the performance in deicing and/or snow-meltingapplication. Here, CNFP wilk be used as high-efficient thermal-source to supply theheat flux for the system, MWCNT will be employed to fabricate theMWCNT/Cement-based high thermal conductive material, and AlN ceramic waferwill be proposed to be the insulated encapsulation candidate.(2) Utilizing solar energy, the experiments of snow-melting in naturalenvironment and deicing in refrigerator facility will be taken to verify thehigh-efficient, security, stability, feasibility and economy of CNFP-based highthermal conductive road deicing and/or snow-melting system.(3) Based on the theories of heat conduction and analytic solutions of PDE,the one-dimensional heat conduction model of system deicing and/or snow-melting,with non-homogeneous boundaries, will be established mathematically. Thisnon-homogeneous transient boundary value problem could be mathematically split into the superposition of static problems with non-homogenous boundary andtransient problem with homogenous boundary conditions, and then the analyticsolutions of transformed problems can be obtained by variable separation methodsand orthogonal expansion technique of series.(3) Utilizing the analytic solutions, the time and energy consumptions ofdeicing and snow-melting test, which are influenced by heat flux density,surrounding temperature, wind speed and thickness of ice and/or snow, will beinvestigated by the parameter analysis methods. Furthermore, based on the thermalanalysis of FEM, the thermal module of ANSYS software will be employed to studythe effects of these parameters on the time and energy expenditures of deicingand/or snow-melting. Through the comparison of the results amount of experiment,analytic solutions and FEM numerical simulation, the evaluation model of timeefficiency and energy consumption in deicing and snow-melting will be proposed asfunctions of multiple parameters (heat flux density, surrounding temperature, windspeed and thickness of ice and/or snow).