Research On Existing Buildings Energy Conservation Strategy Of University In Guangzhou

According to statistics,the energy consumption of colleges and universities in China accounts for about 8% of the total energy consumption of the society,and the average energy consumption of college students is about 4 times the per capita energy consumption value of the national residents.The existing buildings of colleges and universities have large stocks and high energy consumption,so energy-saving transformation is an important task.Through field investigation,this paper found that existing buildings in colleges and universities in Guangzhou mainly have poor thermal performance,poor shading effect,unreasonable use of air conditioning equipment and backward lighting equipment.To address these issues,based on the qualitative analysis of climatic conditions and quantitative analysis of software simulation,focusing on the technical level and the spatial level of reconstruction,supplemented by the user level,to explore suitable energy-saving transformation strategies.Aiming at the problem of poor thermal performance of the envelope structure,energy-saving transformation can be carried out through three aspects: exterior wall,roof and exterior window.The simulation analysis by De ST software shows that setting appropriate insulation layer can reduce the energy consumption of air conditioning,and meanwhile,by reducing the solar radiation absorption coefficient of the outer protective structure surface or adopting greening and heat insulation measures,the cooling load of air conditioning can be significantly reduced.Aiming at the problem of poor shading effect,energy saving goals can be achieved through three forms: external shading,internal shading,and self-shading.The simulation results of De ST software show that,in the design of external sunshade,the energy-saving effect from large to small is: comprehensive sunshade> horizontal sunshade> vertical sunshade.In the inner shading design,the blind has the best energy-saving effect.Self-shading mainly refers to the replacement of energy-saving glass.Low-E glass and insulating glass have the best effect on reducing energy consumption of air conditioners.Considering the indoor thermal environment and light environment,it is recommended to use heat-absorbing glass and heat-reflecting glass.Aiming at the problem of unreasonable use of air conditioning equipment,energy saving is mainly achieved by setting a reasonable opening time and opening temperature.De ST software simulation data shows that each time the set temperature of the air conditioner rises by 1 ° C,the energy consumption is reduced by about 18%.Turning on the air conditioneronly in summer reduces energy consumption by about 25% compared to turning on the air conditioner in both the transition season and the summer season.Therefore,it is recommended to make full use of natural ventilation and fans in the transition season to reduce the use of air conditioning.Aiming at the problems of the lighting system,the energy saving goal is mainly achieved by making full use of natural lighting,replacing energy-saving lamps,and setting up an intelligent lighting control system.Building energy efficiency renovation is a systematic project.In the energy-saving renovation of existing buildings,multiple energy-saving technology combination designs are usually required.In the end,this paper takes the construction of a teaching building in a university in Guangzhou as an example,uses orthogonal test methods to design different energy-saving technology combination tests,and uses De ST software simulation analysis to understand the change rules of the test indicators.It is possible to find the best combination program scientifically and transform the building The energy consumption indexes are smaller than the reference building,which meets the energy-saving design requirements.