Research And Application Of Operation Monitoring And Optimization For Near-zero Energy Office Buildings In Zhengzhou

With the rapid development of China's society and economy,the process of urbanization has gradually moved towards a new path of high quality,high goals and sustainability.Among them,office buildings,as the main places for people's daily work,are widely distributed in cities.Due to their large volume and outstanding energy consumption,they have become the focus of research on building energy conservation in China.At the same time,near-zero-energy buildings have gradually entered the public eye.They are guided by performance-oriented design,focus on reducing the building's physical energy demand,and make full use of renewable energy.Through technology integration,they can provide energy with less energy consumption.Comfortable indoor environment is an important direction for the development of energy-saving buildings in the future.However,the development of near-zero energy buildings in China is still in its infancy,and research has focused on qualitative and quantitative analysis in the early planning and design stages of buildings,and the analysis of operation management and operation effects in the later stages of the building is still very lacking.Based on the above background,this article focuses on Zhengzhou area,and takes practically ground-floating near-zero-energy office buildings as research objects.It analyzes the actual operating effects of the building,and focuses on the operation and optimization of energy supply systems.The main content is divided into four chapters,and the main points are as follows:(1)This article sorts out the concepts,indicators,and design elements of near-zero-energy buildings,and compares China's energy-saving standards with German passive house standards to conclude the corresponding technical theory.Then the article use engineering examples to analyze,and introduce the demonstration project from 7 aspects in detail.Combining technical theory with engineering practice,the research focuses on the building's envelope structure,atrium,skylight and other structural nodes.(2)The article measured the indoor and outdoor temperature and humidity of the building during the winter and summer air-conditioning operation phase,and analyzed the thermal and humidity response characteristics of the venue.The results show that: during the normal use of the stadium in summer,the temperature and humidity of different types of indoor rooms are less affected by the external environment,and personnel behavior is the main factor that causes the indoor temperature and humidity to change.After 8 days,the indoor temperature can still be maintained at a comfortable temperature of 18 ?,and the relative humidity is within60%.(3)The article tests the building's heat recovery new wind turbine in the transition season and summer,and analyzes the effect of its heat recovery module on energy consumption.The research results show that the heat recovery efficiency of the stadium during the transitional season is not high,and the indoor good heat and humidity environment can be maintained by natural ventilation;the total heat recovery efficiency of its new fan unit during the summer test period reached 72.93%,and the heat recovery amount was 91808.5KJ,reducing air conditioning 24.1%energy consumption,significant energy saving effect.(4)The article calculated the energy consumption of the building from April to September 2019.The results show that the largest percentage of the building's power consumption in the transition season is the electricity from the socket.However,after entering summer in June,HVAC The system has become the largest electricity consumption sub-item,and its electricity consumption ratio is close to half of the electricity consumption of the month.(5)The article analyzes in detail the heating,ventilation and air-conditioning system with the largest proportion of building electricity.Through the analysis of the measured operating effects of the ground-source heat pump system in winter and summer,it can be obtained that the average COP of the large and small units in the summer system is 5.1 and 5.01,while the winter operation The indicator value is 3.53.In addition,in summer conditions,when the indoor thermal load is not high,the energy saving measures of the unit bypass are adopted,which further saves energy,while the winter system operation has a "large flow,small temperature difference" phenomenon.On the whole,the problems of high energy consumption and unbalanced cold and heat in the circulating water pump of the system are more prominent.(6)According to the actual problems in the operation of the air-conditioning system,the article uses TRNSYS software to establish a system model and proposes optimization measures through comparative analysis.The following conclusions are drawn: After changing the pump operation strategy and adding cooling towers,the unit performance has improved,typical in winter and summer The daily energy consumption is reduced by 42% and 22% respectively,and the annual average soil temperature under optimized control is reduced by 0.79? compared with thebenchmark model.The research results of this paper can provide references and suggestions for the further development of China's near-zero energy buildings.