The Software And Database Research On Dynamic Heat Transfer Characteristics Analysis Of Underground Structures

As above-ground components of the building thermal fabric become more energyefficient, the heat transfer between the building and the ground become relativelymore important and can no longer be neglected. Thus, it is necessary to analyze andresearch adequately the ground-coupled heat transfer problems. In this paper, theauthor developed the analysis software about heat transfer characteristics ofunderground structures. It can run on windows computer that have installed MicrosoftExcel2003and MATLAB R2009a and above version. The software programparameters input interface with Visual Basic6.0, whereas the numerical calculationwith MATLAB. The element-free Galerkin method is integrated in software toanalysis heat transfer of underground structures model, mainly including heat flowcalculation and temperature filed distribution. They can be used as a reference for theengineer and designer.In this paper, heat transfer characteristics of underground structures werein-depth studied with the software. Firstly, in order to analyze the ground-coupledheat transfer problems more easily, a simplified heat transfer model which based onsome assumptions was built. Secondly, the steady heat transfer boundary conditionsand unsteady initial-boundary conditions of the underground structures weredetermined. Finally, the steady and unsteady heat transfer characteristics ofunderground structures were studied in detail.In the steady analysis, nodes and temperature filed distribution were mainlyconsidered. The sensitivity analyses of the soil thermal conductivity, outdoor surfacewind speed, far filed boundary, water table and distance of the roof from the groundsurface were also carried out. In order to analyze the relationship between insulationand the floor, wall and roof heat flux, the paper chose PVC foam as insulationmaterials and0.06m,0.12m,0.18m and0.24m as a set of thermal insulation thickness,the corresponding thermal resistance R for1,2,3,4(m~2·K)/W.In the unsteady parametric sensitivity analyses, the soil thermal conductivity wasmainly carried out to research on how to influence the floor, wall and roof heat fluxwith selecting0.6,1.2,2.4W/(m·K) as a set of the soil thermal conductivity. In theunsteady insulation analysis, the paper chose PVC foam as insulation materials and0.12m as insulation thickness to research on energy consumption of the undergroundstructures by changing the length and arrangement of the thermal insulation layer.