Dynamic simulation of conjugate heat transfer in shallow- buried underground intermittent air- conditioning system

摘要

Different from over- ground buildings, simulation of energy consumption in shallow- buried underground buildings mostly come down to dynamic conjugate heat transfer calculation of soil envelops. In study of dynamic simulating the heat transfer of envelops in underground intermittent air - conditioning system, it applied whole - filed numerically solution in united region of solid and fluid to solve the three - dimension unsteady problem which is with this conjugate heat transfer boundary. At the same time, the method based on "false density"which is to solve energy equation with temperature being solved variable was employed to ensure physical continuity of numerical outcomes, and interface diffusivity was set as harmonic mean value. Meanwhile PISO algorithm with co -located grids was used to speed up numerical convergence. Both the model and measures were testified by the experimental data. At last the paper analyzed the influence of building's depth, shape simplification, and also time step, grid to results of simulation. Rules about conjugate heat transfer of underground intermittent air -conditioning system showed by simulated results are important and essential to future application research.