Simulation Study On Hybrid Ventilation And Natural Ventilation Enhanced By Solar Energy

Hybrid ventilation is a new energy-saving ventilation mode whichcontains the advantages both of natural ventilation and mechanicalventilation. With the growing of energy crisis, hybrid ventilation andsolar enhancing natural ventilation have attracted widespread attention.Due to the research of using hybrid ventilation and solar enhancingnatural ventilation in building is still in the initial stage of exploration inChina, there is not a comprehensive theoretical system about hybridventilation and solar enhancing natural ventilation, and the relevantdesign specifications and standards also need to be improved. In addition,the design of hybrid ventilation and solar enhancing natural ventilationsystem is so complex that needs a reasonable and perfect automaticcontrol system. Therefore, it has great significance to further improve andpopularize hybrid ventilation and solar enhancing natural ventilation.In this paper, the theory of hybrid ventilation and solar enhancingnatural ventilation is analyzed completely, and take the residentialbuilding in Zhuzhou as the research object, using the CFD software tocarried on the numerical simulation research of the typical systems ofhybrid ventilation and solar enhancing natural ventilation under typicalclimate conditions of the hot summer and cold winter region. And takethe simulation results compare with the theoretical value. Analyzes somevarious ventilation modes which is applicable to different conditions ofclimate, and get the following conclusions as follow: In the situation ofnatural ventilation induced by outdoor wind pressure, the distribution ofstreamlines is uniform and the distribution of air is in good condition,therefore, when the natural ventilation can meet the demand of air rate,we should first adopt natural ventilation; when the outdoor wind speed issmall, the effect of solar chimney strengthen natural ventilation is moresignificant; When mechanical air supply is used, we should arrange thestructure of air supply outlet reasonably, adjust the direction of air supplyand speed of wind. If the structure of vent is unreasonable, it will createlarger eddy current inside that is not conducive to the uniform distributionand circulation of air flow, and also it will have influence to the indoor air quality and thermal comfort. Hybrid ventilation and solar enhancingnatural ventilation has significant effect to improve the indoorenvironment throughout the year, and in less solar radiation condition,there are still potential of improving the indoor air temperature and theindoor thermal environment. Therefore, hybrid ventilation and solarenhancing natural ventilation as the modes of energy saving ventilation tobe able to make full use of renewable energy and reduce energyconsumption of building have the broad prospects for development.