Study On Energy Saving And Economic Optimization Of An Ultralow Energy Consumption Public Building In Qinghai

People are growing increasingly reliant on primary energy as society evolves and living standards rise.The ensuing issue is the rapid increase of carbon emissions.Energy conservation and emission reduction in all aspects of life are essential if China is to reach its goal of carbon peak and carbon neutrality.The construction industry,as one of the three biggest energy consumers,has a lot of room for energy conservation and emission reduction.China is also actively conducting research on ultra-low energy consumption and near-zero energy consumption buildings,and has constructed ultra-low energy consumption and near-zero energy consumption demonstration buildings in a number of locations,but there is relatively little research on ultra-low energy consumption public buildings in Qinghai Province’s high-altitude and cold areas.As a result,study in this area on energy conservation and economy of ultra-low energy consumption public buildings would help to promote ultra-low energy consumption buildings,near zero energy consumption buildings,and even zero energy consumption buildings.This article takes an ultra-low energy consumption public building in Golog Prefecture of Qinghai Province as the research object.Through the comparative analysis of the field measured results,the influence of the envelope structure of the ultra-low energy consumption public building on the indoor temperature is obtained.The results show that when the outdoor temperature is-20.8℃,the good thermal performance of the building envelope can maintain the indoor temperature of the building at 17.5℃,and the temperature variation range of the building all day is within5.7℃.In order to further study the impact of passive energy-saving technology on the energy consumption of ultra-low energy consumption public buildings,this paper uses the design builder energy consumption simulation software to simulate the energy consumption of buildings,and obtains the best value range of technical parameters in the passive energy-saving technology.The results show that there is no cooling demand in summer;The optimum values of the thickness of external wall and roof insulation layer are 350mm～450mm and 250mm～350mm respectively;The optimum range of window wall ratio in the south is 10%～15%,that in the north is about 25%,that in the East is 20%～25%,and that in the west is 10%～12.5%;When the building faces about30°from south to west,the solar radiation heat gain is the highest in the heating season.The reduction of building energy consumption means that the initial investment will increase correspondingly.In this paper,the technical parameters are selected in the best range and 72 schemes are combined,and the optimal schemes aiming at energy consumption and economy are obtained;By calculating the energy consumption reduction corresponding to every ten thousand yuan increase in the total investment within the service life of each scheme,five energy consumption and economic double optimization schemes are obtained.Compared with the demonstration building,the energy consumption of the five schemes is saved by 32.66 MWh～86.80 MWh,the total cost is reduced by 242500 yuan～269300 yuan,and the energy consumption is reduced by 11.83tce～31.41tce,CO₂.The emission is reduced by 31.36t～83.24t,and the comprehensive energy saving rate is between 63.01%and 64.40%.