Research On Design Optimization Of Sunspace Of Residential Buildings In Western Sichuan Based On Reducing Winter Heating Energy Consumption

China’s energy consumption is increasing day by day,and the proportion of building energy consumption is huge.Doing a good job in building energy saving is of global significance for promoting comprehensive energy conservation and emission reduction and promoting green development.The western Sichuan area belongs to the severe cold and cold area according to the building thermal engineering design zone,and the residential building consumes a large amount of heating energy in winter.However,the region is rich in solar energy during the winter.Passive solar buildings are an effective energy-saving method for buildings.They can make full use of the solar energy during the day to reduce the energy consumption of residential buildings.The design strategy has important theoretical and practical significance.The thesis takes residential buildings in Kangding City,Ganzi Prefecture as the main research object,and uses field test,theoretical analysis and computer numerical simulation to discuss the suitability of passive solar technology and related design strategies.First,the thesis conducted a field test on a residential building in Kangding City.The results of outdoor meteorological parameters,the surface temperature of the windows of the passive solar house,the indoor air temperature,and the wall temperature of the wall showed that the total solar radiation value in winter in Kangding area is the largest Up to780 W / m2,suitable for the construction of passive solar energy buildings;the additional sunlight room is a direct benefit room,which can increase the indoor temperature during the day and night;the temperature of the cavity can be increased by about 2 ℃ after the curtain is set at the night sunlight room,effectively reducing The loss of small heat;and the thermal insulation performance of the windows at night also has a great impact on the indoor thermal environment.The temperature difference between the two side walls of the double-layer hollow glass can reach 2 ℃,but the temperature on both sides of the ordinary single-layer glass is basically the same.In order to explore the specific influence of the sunlight room on the heat transfer,using the measured data,only the west wall and window of the additional sunlight room and the directly benefited room were calculated for 24-hour heat transfer.The results showed that the two rooms were unit time within 24 hours The average residual heat difference is 101 W.Then,the paper uses Fluent software to perform numerical simulation on the measured room,explore the outdoor temperature and solar radiation room temperature field distribution under the dynamic change of 24 hours,and compare the measured and simulated results to verify the reliability of CFD numerical simulation.In the simulation,factors such as thermal disturbance and different envelope structures are eliminated.The difference between the average indoor temperature of the additional sunlight room and the direct benefit room is 2 ～ 3 ℃.Then,the temperature field of the additional sunlight room with different orientations under 24 hours was simulated,and it was found that the maximum temperature of the air in the south-facing sunlight room was about 12 ℃ higher than that in the north,and the maximum temperature of the indoor air in the south direction was 5.8 ℃ higher than that in the north.Finally,in order to deeply explore the suitable engineering application scheme of passive solar energy utilization in the winter heating of residential buildings in the western Sichuan plateau area,the paper used a five-story residential building in Kangding City,western Gansu Prefecture as the prototype,and established the heating energy consumption of the residential building in the western Sichuan plateau region The model analyzes the change of thermal load index under different building orientations and different window-to-wall ratios.Further study the impact of the sunlight room on building energy consumption,and found that after setting the sunlight room in all directions,the energy consumption can be reduced by more than 10%,and the ratio of glass surface position,cavity width,glass structure,curtain material,partition wall,window wall ratio,etc.A single factor study was carried out on the influence of several design parameters on building heating energy consumption in winter.The thesis designs and arranges the "three factors and four levels" orthogonal experiment for the three main influencing factors such as cavity width,glass structure,curtain material,etc.,and analyzes the design of the solar room as a passive solar energy for winter heating in the western Sichuan area.The degree of influence of three factors on building energy consumption.The results show that the cavity width has the greatest influence on the energy consumption of the additional closed balcony type sunspace and the glass structure has the greatest influence on the energy consumption of double skin facade.According to the above energy consumption simulation results,the corresponding Suggestions for ganzi project are finally obtained.