The Study On The Simulated Characteristic Of Ventilation Network In Residential Building

With arising of sustainable development, the problems of building energy conservation become more and more critical and urgent. More attention is paid to natural ventilation again because of the need for contacting nature. Natural ventilation and infiltration make very important effect on building loads. On one hand, the energy loss caused by ventilation and infiltration accounts for a considerable proportion of heating and cooling loads; on the other hand, in mild condition, the passive cooling systems which use natural ventilation could take place of traditional air conditioning systems, and therefore cut down the amount of used energy. However, the lack of reliable tools to predict airflows extremely limits analyses of building energy consumption, dynamic thermal building simulation and passive cooling system design.Firstly, through literature review, the author summerized numerical principle and methods to the simulation of ventilation problems systemically in this paper. Pointed that the designed principle of the software in which the coupled calculation of airflow model and thermal building model are considered. Further,As the example of micro- model, CFD is used to simulate the indoor environment of residential building .Then, the principle of muti-zone network model in macro- methods is study. then, on the base of this method ,author composed a little MATLAB program to calculate the network model and achieved ventilated simulation of a residetial building during to wind pressure. Moreover, taken CFD as a tool , the indoor environment of a typical residential building is be simulated. And the results of macro- & micro-methods are discussed nextly.Moreover, the approach to wind pressure on building envelope in multizone airflow modeling was analyzed. Give a discussion to the source of ventilation power and pressure coefficient in large openning building, and a correction to the Cp value in the condition of the area of openings in large proportion to surfaces was proposed. The results of them can give some advisable help to the building design. In sum ,the results of this paper had established the theoretical and application bases for calculating ventilation and infiltration in engineering. It also provided a software platform for the research of natural ventilation and infiltration problems and design of passive cooling systems.