Study On Low Energy Consumption Structure System Of Qinba Mountainous Building

Improve the health and comfort of the indoor thermal environment of rural houses,realize the local conditions and reduce the energy consumption of building products,which is an important foothold for achieving harmonious integration of architecture and environment and sustainable development of buildings,and also a requirement for China to reduce the construction cost while creating a healthy ecological living environment in the construction of new countryside.In this paper,under the climatic conditions of the Qinba Mountain area,through the investigation and test of the residents’ production lifestyle,living habits and the unique style and characteristics of the local traditional rural architecture,the theoretical analysis and numerical simulation method are used to study the structural measures of the outer protective structure of Qinba Mountain Building.Based on the three-dimensional heat transfer principle,the three-dimensional finite element heat transfer model of mountain buildings is established.The thermal design of Qinba mountainous buildings was carried out and the structural system was optimized and analyzed,and finally a suitable low-energy structure system was obtained.This paper has done the following work and concluded:(1)Through on-site investigation and testing,it was found that due to the special geographical location of Qinba Mountain,the problem of wet and cold winter is serious and the air temperature is close to the cold area.Residents have a strong willingness to improve indoor thermal comfort in winter.Based on this,this paper focuses on winter insulation during the structural design process and demonstrates that low-energy structures do not cause indoor temperature rise in summer.(2)Based on the survey and field test results,the plane layout and characteristic parameters of the typical buildings in Qinba Mountain were determined.Based on this,the three-dimensional finite element CFX physical heat transfer model of typical buildings in Qinba Mountain was established.The outdoor comprehensive temperature of different orientations from winter solstice and summer solstice is calculated,and the fourth-order expansion function expression of Fourier series of outdoor temperature is obtained as the boundary condition of the three-dimensional heat transfer physical model.(3)Combining the unique production and lifestyle,living habits,clothing style and thermal environment adaptability of Qinba mountain residents,determine the subjective temperature as the temperature index for evaluating the indoor thermal environment.During the winter day,the room temperature should be no lower than 14℃,no more than 12℃ at night,and room temperature should not be higher than 27℃ in summer.The calculation determines that the low-energy building consumes no more than 30W/m2.(4)Calculated based on the uniform radiation field design principle:setting the basic heat transfer coefficient equal to the heat transfer coefficient of the south outward wall,the heat transfer coefficients of the east,west and north outer walls and the roof are respectively equal to 1.13,1.06,1.14 and 1.22 times of the basic heat transfer coefficient.Combined with the basic heat transfer coefficient,the relationship between the area ratio of the north-south window and the auxiliary heat consumption during the heating period,the heat transfer coefficient of the different facing retaining structures and the area ratio of the north-south window and wall are preliminarily determined.(5)Thermal design of the outer protective structure of Qinba Mountain Building,through the comparative analysis of the simulation results of different working conditions of typical buildings under different window and window area ratio,external wall,roof structure and auxiliary heat source.Optimize the structure of the external protection structure,and finally obtain a suitable local low-energy structure system,so that it can reduce the heating energy consumption in winter by 50%while meeting the indoor thermal comfort temperature.This paper takes the two aspects of indoor thermal comfort and energy reduction as the foothold to study the low-energy structure system of Qinba Mountain Building,and reduce the building energy consumption while improving indoor thermal comfort,and provide theoretical support for the construction of new countryside in the hot summer and cold winter regions.