Measurement And Simulation Of Natural Ventilation Of Rural Dwellings In Chongqing

With the progress of the urbanization, energy demand in Chongqing rural area would increase greatly. Natural ventilation as one of passive energy saving technology is the key point of rural energy conservation. At present, there is no relevant natural ventilation design standard for architectural design personnel, especially the rural house design is relatively rough, lack of understanding and using of passive technology. Rural has the advantage of natural ventilation conditions compared with urban area, so it is necessary to study the natural ventilation in Chongqing rural house.This paper combine investigation, measurement and CFD simulation.Through the investigation research of Chongqing rural houses, indoor and outdoor environment characteristics of rural house, tectonic characteristics, energy-using status and lifestyle characteristics are summarized, and it is concluded that the natural ventilation optimization strategy of rural house; Through the typical residential measurement, it is concluded that indoor thermal environment is high temperature and high humidity in sunshine day, the average relative humidity range is 70 ~ 80%. Indoor temperature is 28 ℃at night. Indoor temperature is low and more comfortable in cloudy days and rainy days Indoor wind speed is low, the wind speed is about 0.16 m/s when ventilation during the day, and is about 0.1 m/s when night ventilation, wind speed is 0.05 m/s with on ventilation.Through the simulation of mountainous region of Huanggua Mountain, it is concluded that wind field distribution features are: the wind speed increases with altitude increasing.Huanggua mountain elevation is 600 meters above, wind speed from the ground 1.5 meters is 1 m/s to 3 m/s, site selection for construction of natural ventilation is reasonable. And by mastering the basic change rule of wind direction and wind speed, it provides the reference for site selection and natural ventilation design in mountain region.Finally, natural ventilation strategy(ventilation period, ventilation form, window size) is simulated with FLUENT for suitability analysis, it is concluded that the appropriate time of ventilation is a rainy day, cloudy day and sunny day in morning, evening and night time. It is suggested that architectural design should think the dominant wind direction of ventilation time into consideration, avoid high temperature hot air to meet sunny afternoon wind direction, organize cool wind speed and direction to design natural ventilation.In high temperature period,indoor temperature of cross ventilation has 1 ℃ higher than single-sided ventilation, but cross ventilation will improve indoor air velocity and indoor ventilation rate; The window location can influence on ventilation rate and indoor air flow distribution; the ventilation rate will increase 61%...