Influence Of Different Ventilation Schemes On Energy Consumption Of A Commercial Building In Hefei Area

The rapid development of economy promotes the progress of the construction field,and the development of the construction industry inevitably leads to the rise of building energy consumption.How to reduce building energy consumption has become a worldwide problem.On December 25,2019,AnHui provincial administration of market supervision issued 161 local standards in AnHui province,witch will fully implement the 65% energy saving standard for residential buildings from June 25,2020.In hot summer and cold winter areas,ventilation as an effective way to reduce building energy consumption is being put into practical use.By studying the influence of ventilation on building energy consumption and adopting reasonable ventilation scheme,this technology will bring greater energy-saving benefits to the construction industry.Firstly,the ventilation research methods and achievements at home and abroad are described in detail.Natural ventilation and night ventilation both bring great energy saving benefits to buildings,and how to make a reasonable ventilation plan is the study of scholars in all countries.Some changed the structure and materials of the envelope to change the ventilation effect,while others combined ventilation with solar energy,some scholars from different regions have contributed a lot of data by combining their local climatic parameters and ventilation.There are also different research methods,such as experiments,simulation,and some combination of experiment and simulation.Taking China as an example,DeST is the most widely used simulation software for ventilation analysis.In this paper,a commercial building in hefei was taken as the research object.Combined with the climatic conditions of hefei,the outdoor indoor wind environment of the building was first analyzed by using the green building wind environment simulation software PKPM-CFD,wind speed magnification coefficient of wind speed cloud map in winter condition;the wind free zone and vortex zone in summer working condition;the wind-free zone and vortex zone in transition season were simulated and analyzed.The simulation results showed that the parameters of the indoor and outdoor wind environment of the building meet the requirements of human comfort.Based on the simulation of indoor and outdoor wind environment,DeST-c was used to conduct the modeling of the commercial building.The load variation of the building was analyzed by changing the presence of ventilation,all-day ventilation period,nightventilation period,ventilation rate.Compared with the no-ventilation condition,the simulation results of load reduction in other conditions show that,taking the building load without ventilation scheme as the base value,the accumulative cooling load with ventilation is 9.39% lower than that without ventilation.The night ventilation during the operation without air conditioning can significantly reduce the building energy consumption,which is 19.88% less than the building load under the condition without air conditioning.With the increase of the number of air changes,the annual accumulative cooling load and the annual maximum cooling load gradually decrease.After the number of air changes is greater than 7 times/hour,the increase of the number of air changes has no obvious effect on the annual accumulative cooling load and the annual maximum cooling load.The optimal number of ventilation is 7times/hour during the operation without air conditioning,which is 24.56% lower than the building load under the condition of no ventilation.Moreover,during the period from 4:00 PM to 7:00 am,the ventilation load is significantly reduced,which is 12.43% less than the building load under no ventilation condition.The above simulation was coupled,and the coupling was divided into summer and transition seasons.It is concluded that the optimal ventilation period is the operation period without air conditioning in summer and the all-day ventilation in the transition season,which reduces the building load by 14.72%.By coupling the ventilation period with the ventilation times,the optimal ventilation scheme is obtained: ventilation with 7 times of ventilation during the operation without air conditioning in summer,and ventilation with 3times/hour of ventilation throughout the day in the transition season,which is 22.4% less than the building load under the condition of no ventilation.Figure [64] table [40] reference [63]...