Study On The Optimization Design Of Large Complexity Kang Flue Structure Aiming At Improving Thermal Comfort And Thermal Efficiency

With the continuous development of China's economy and improvement of the living standards,rural pastoral residents are increasingly demanding the thermal comfort of the indoor residential buildings,which has become one of the goals of the rural revitalization strategy.kang are a kind of bed-like facilities widely used by farmers and herdsmen to meet their daily needs and indoor heating in winter.Different types of kangs in various regions are built according to folk experience.These kangs,however,are generally characterized by uneven temperature of the surface— "hot head and cold end ",poor thermal comfort,high energy consumption,and low thermal efficiency.Therefore,how to effectively combine natural and existing conditions to build a good thermal comfort and efficiency for farmers and herdsmen is the core issue of the research.This paper combs the results of the relevant research on the thermal comfort and efficiency of residential buildings at home and abroad.It is based on the large complexity kang,which are widely used in the eastern part of Inner Mongolia,including New Barag Left Banner,Horqin Right Middle Banner,Jalaid Banner,Taibus Banner,Hariqin Banner,Kailu County and so on.The whole hole of the Kang from the smoke inlet to the smoke outlet is taken as the research object.Firstly,based on field research,a typical Dahuadong kang model is established,and the current thermal comfort and thermal efficiency are analyzed by using the fluid mechanics VENT software and ANSYS simulation technology.The results show that the area of the smoke flow field in the fire hole is reduced,the uniformity of the smoke flow velocity distribution is unbanlanced,and there is a large area of eddy current in the entire cavity;after the high-temperature flue gas enters the inside of the cavities,the temperature of the flue gas close to the bed layer is lower,the heat transferred by the flue gas to the bed plate is less,and the exhaust gas temperature is higher.These factors lead to poor thermal comfort and low thermal efficiency of the current kang.This paper combines the knowledge of building thermal engineering and fluid mechanics to analyze the distribution of flue gas flow field inside the cavity,and to improve the layout of the current fire flue.According to the principle of “front and rear guide”,the smoke wall and guide are reasonably set.The purpose of the smoke wall is to make the distribution of the smoke flow field beneficial to improve the thermal comfort and thermal efficiency.Finally,two kang models are selected.In this paper,the VENT software and ANSYS simulation technology are used to analyze the smoke flow field and temperature changes of the selected two models.It is concluded that the area of the eddy current area in the fire hole is greatly reduced compared with the current fire.Moreover,the flow velocity distribution of the high-temperature flue gas in the entire cavity is more uniform,and the flow field area is enlarged;at the same time.At the same time,the temperature of the flue gas near the raft is increased,and more heat of the high-temperature flue gas is absorbed by the slab,thereby increasing the temperature of the slab and reducing the smoke loss.This shows that the improved kang has been significantly improved in terms of thermal comfort and thermal efficiency.The simulation technology used in this paper provides a new simulation method and technical support for improving the thermal comfort and thermal efficiency of the kang,also providing a basis for the building of new kind of kang.