Research On Energy-Saving Optimization Strategy Of Changsha Expo Building Lobby Interface Based On The Indoor Thermal Environment

As a carrier of cultural exchange,expo buildings have sprung up in cities and have become urban landmarks.Many of the existing expo buildings were built for a long time and their design conditions were relatively backward.and it takes a lot of energy to maintain a good indoor thermal environment(ITE),which is not only unfavorable for energy conservation and environmental protection but also difficult to fulfill its special cultural mission.Most of the previous studies only focus on the space and function of the expo building.Therefore,it is necessary to analyze the current situation of the ITE and the energy consumption(EC)of the expo building.On the basis of the existing problems,the appropriate values of the design variables of the lobby interface are studied.Expo building lobby interface optimization strategy to achieve the effect of improving the ITE and saving energy and reducing consumption.This paper takes the common types of lobby spaces of expo buildings in Changsha City in hot summer and cold winter as the research object,summarizes the current thermal environment status,and analyzes the causes through field investigation,measurement combined with the Kriging interpolation method;Using DesignBuilder numerical simulation combined with Origin data analysis to quantitatively study the influence of hall interface factors on the ITE and building energy consumption(BEC);applying the methods of life cycle cost analysis and sensitivity analysis to calculate and analyze the simulated data,and propose a method suitable for Changsha Expo building hall interface.optimization strategy;finally,it is applied in practice and verified by the numerical simulation method.The main contents and results of this paper:(1)Starting from the development of exhibition industry,the current situation of ITE of existing buildings and the urgency of energy conservation and emission reduction,the importance of reducing EC of expo buildings is expounded.Then,through on-the-spot investigation of the existing expo buildings in Changsha,the size,type,location,proportion of transparent interface and shading of the foyer space of this type of building are summarized to provide data support for the subsequent establishment of typical models.After that,one of the representative expo buildings was selected for ITE measurement and visual analysis,and the ITE conditions of each space of the building and the temperature and humidity distribution of the lobby space were obtained.The entry point of the expo building energy efficiency concept:(2)Compare the principles and functions of various BEC simulation software.select DesignBuilder simulation software to predict BEC and ITE.and establish a typical lobby model according to the survey results;(3)By simulating typical models,the effects of different external thermal insulation materials and thicknesses,external surface solar radiation absorption rate,transparent interface heat transfer coefficient,solar heat gain coefficient,transparent interface proportion,and movable louvers and roller shutters on the overall.The influence of EC and ITE.summarizing the energy-saving,optimization strategies suitable for the interface of the foyer of the expo building in Changsha area:(4)Select an expo building in Changsha City,apply the optimization strategy of the interface of the lobby,and propose two targeted optimization schemes.This building is optimized and reconstructed,and various parameters such as EC and annual moderate temperature of the building before and after the reconstruction are compared.The results show that the optimization strategy has a good optimization effect.which can reduce the total EC of the building by 22.65%and increase the annual moderate temperature by 1098.2 hours.By comparing the influences of different lobby interface factors on the ITE and EC.this paper obtained the optimal lobby interface optimization strategy and improved the energy-saving design and optimization theory of building space interface,to provide a reference for the optimization of the lobby interface of expo buildings in hot summer and cold winter areas.