Energy Consumption Analysis Of A Library Building In Zhengzhou Based On The Combination Of Energy Plus Active-passive Technology

In the context of"dual carbon",scientific and effective building energy efficiency design is one of the most important ways to achieve energy saving and emission reduction in the building sector.The combination of passive and active technologies has been widely used in the design of residential and public buildings,but little research has been done on the energy efficiency of libraries.With the rise of’college fever’and’public exam fever’,libraries are often hard to find.The problem of daily energy consumption is becoming more and more prominent as the energy demand increases while maintaining the appropriate indoor temperature.Therefore,the key to solving the problem of increasing energy consumption in libraries is to adopt reasonable and effective energy saving solutions in the engineering design of libraries.Based on the above points,this paper takes a library in the Zhengzhou area as the research object and uses Energy Plus to simulate the energy consumption of energy saving solutions under different design parameters with active and passive technologies and various combinations of active and passive technologies.Through an in-depth analysis of the energy saving effects of different active and passive technologies and their combinations,important factors affecting the energy consumption of the system are derived,providing a theoretical basis for the design and optimisation of energy saving solutions for the new library in Zhengzhou and making recommendations for the energy saving design of the building.The specific research elements are as follows:Firstly,by reviewing and analysing the development of domestic and international building energy efficiency design concepts and existing research related to active and passive technologies,as well as investigating and studying actual engineering cases in green libraries,the general idea of using the combined active-passive technology scheme as a library energy efficiency design was determined on this basis.Secondly,the library built by Sketch Up was imported into the Energy Plus simulation software as a benchmark model,and the functional areas of the library were divided into thermal zones.The energy consumption of each active and passive technology applied to the library alone was compared and analysed,taking into account the energy consumption characteristics of the benchmark model,to verify the feasibility and energy efficiency of each technology.The final solution was to optimise the envelope（roof,walls and external windows）as a passive technology,and to add fresh air heat recovery technology and a"ground source heat pump+solar collector"system as an active technology.Again,the combined system was constructed based on Energy Plus simulation software,and the thermal conductivity of the roof(R_TC,)the thermal conductivity of the walls(W_TC,)the heat gain coefficient of the windows（SHCG）,the solar collector specification（SCP）,the displacement of the ground source heat pump compressor（PD）,the pressure difference between the suction and discharge of the compressor（P）,and the soil heat transfer coefficient(G_TC)were selected for parametric analysis.The results show that the combination of active and passive technologies can significantly reduce the energy consumption of the library,and the technical parameters and the system energy consumption show a linear trend,with R_TC,W_TC,G_TC and SCP increasing,the system energy consumption decreases,and with SHGC,PD and P increasing,the system energy consumption also gradually increases.The change in system energy consumption is particularly significant when the PD value changes.Finally,based on the results of the parametric analysis and considering the relationship between each parameter and the system energy consumption,the formula for calculating the building energy consumption of the combined scheme of main-passive technology is combined with the multiple linear regression method,and the accuracy and scientificity of the formula is verified.Using this formula to analyse the contribution of each technical design parameter in the combined scheme,the results show that PD>SHCG>R_TC>SCP>G_TC>P>W_TC,the passive technology has a certain effect on reducing building energy consumption,but for the system energy use,the energy saving effect of the active technology is more prominent.The research results of this paper can provide scientific improvement measures and suggestions for the optimal design of energy saving in new libraries in Zhengzhou,and also provide a scientific and quantitative analysis method for the selection of energy saving solutions and design optimization directions for public buildings with intensive passenger flow.