Study On Numerical Simulation Of Indoor Environment

The way to predict the indoor environment is an important research direction of HVAC study. Along with the computer technology and development of CFD, CFD becomes a significant tool to analyze indoor environment. At present, about 50 kinds of commercial CFD software are in use, most of them are expensive cause copyright reserved by foreign corporation or research center. Meanwhile, it`s hard to update latest research achievement timely. So it`s urgent and significant to develop a CFD software by ourselves. Based on the research on thermal environment mathematic model, the author made a lot of revisions to improve the indoor environment simulation source code of our studying team using Visual Basic 6.0 and Compaq Visual Fortran 6.6. The new software IAMTE 3.0 for indoor environment mathematic simulation has friend-interface and more efficient mathematic model.At the first part of this paper, the author does researches on general considerations of thermal environment simulation and built a common equations set of flow heat interchange. The author obtains the conventional algorithm and improves measures of flow heat interchange after discrete the equations set. Those works provide methods of solving the indoor air thermal environment mathematic simulation. Research on special considerations of thermal environment simulation is thesecond part of this paper. The author introduced methods for thermal environment simulation (such as air supply opening model, heating source model and pollution source model), then combine those simplified model to the software. The software can accurately reflect the indoor thermal environment situation (such as airflow organization, thermal comfort situation and distribution situation of pollution source) after those works has done.Thirdly, the author put forward a structured network generation algorithm based on ZONE space to satisfy the demand of the indoor thermal environment mesh generation. This algorithm can change the grid pattern with human control and saving the computing time by adjust the grid pattern (such as homogeneous or inhomogeneous, thin or thick) in kinds of situation, so the gridding quality is perfect. This network generation algorithm is suit for the gridding quality control of indoor air thermal environment simulation.In the end, the author developed software interface for various functions based on software platform of Visual Basic 6.0, and achieved the visualization of pretreatment process. With the help of Compaq Visual Fortran 6.6, lots of revisions on core computing part are made to improve the treat process for various parameters which has described in the pretreatment process. Date structure form Tecplot can recognition and implementation method of the software output are put forward, those eventually bring out the complete of the IAMTE 3.0 indoor air thermal environment mathematic simulation develop. The simulation (such as airflow organization simulation and distribution situation of pollution source simulation) results of this software is reliable according to the comparison with Airpak, a mature commercial CFD software with wild use.