The Generation Mechanism And Design Optimization Of The Natural Ventilation For Traditional Residence In Huizhou

Huizhou traditional residence is a typical representative of Chinese traditional residence,which is a product of ancient people that have been developed to adapt to the natural environment for a long time.It contains a large number of technical experiences on natural ventilation in order to extend the indoor comfortable time and improve indoor air quality,the traditional residence adopt various technique to enhance ventilation.The status of natural ventilation in the application of modern residential buildings is gradually decreasing.It is meaningful and significant to explore the passive ventilation strategy in traditional local-style residence for a better inheritance on the modification of the modern houses.The purpose of this paper is to explore the natural ventilation technology of traditional residence,Characteristics of the wind space environment under two types of patio,i.e.Shape of“-” and shape of“回”,is evaluated using the measured and CFD simulation method.The measures are proposed to improve the wind and hot pressing ventilation of traditional residences.First,the indoor wind speed,wind direction and the number of ventilation are measured.the measurement test shows that the ventilation rate living room with “-”form patio is 6.41~28.57 h-1 under different conditions of doors,while the ventilation rate of the bedroom is 1.97 ~ 13.02 h-1.As the living room is interlinked with outdoor environment through the patio,it has a good ventilation performance,and the opening or closing of the screen can also adjust the indoor wind speed.In addition,the wooden enclosure and single-side opened of the bedroom enable a good air permeability and no blowing feeling.The hot ventilation of the “回” form patio houses is proved to be better than that of the “-” form patio houses,which can enhance and the effect of cold-proof in winter.The flow field distribution under different test conditions is drawn in terms of network diagram in based on the measured wind speed and direction.Then,simulation of wind pressure and hot pressing ventilation in traditional dwellings.Based on the simplified building physics model,the results of different turbulence models are compared to obtain indoor zero equation model suitable for traditional houses.The simulation results show that the indoor flow field distribution is uniform under different conditions.When the wind exists,the living room is mainly subjected to wind pressure ventilation and the hot pressing effect can be ignored;By contrast,the hot pressing ventilation effect is significant in bedroom.Compared with the wind pressure,the mass flow rate of bedroom under the combined hot and wind pressure can be increased by 1.8 times.Under the effect of hot ventilation,the temperature differences between indoor and outdoor are maintained at around 1.2℃during night,which indicating a good ventilation cooling effect for the night.Finally,optimization measures will be put forward based on the rule of wind pressure and hot pressing in residential buildings.It can be concluded that the patio has a significant wind-proof effect with the efficiency of 71.86%.The indoor wind pressure ventilation can be significantly improved under the condition of the bedroom with windows.The "一" form patio houses with patio length of 12.64 m is found to be the optimal size.The relationship between ventilation change of " 一 " form patio living room/bedroom and indoor/outdoor temperature difference is fitted as formula function.The optimized layout of the traditional residential residence can be employed to modern buildings design that can improve the ventilation and energy saving effect of the building.