Research On The Control Of Louver Shading Devices In Office Building Considering Daylighting And Thermal Comfort And Energy

With the rapid development of economy,office buildings have grown rapidly,and the light and heat environment in the office has attracted more and more attention.At present,office buildings mostly use glass curtain walls,which have a large window-to-wall ratio to ensure good lighting of the room.At this time,more sunlight is incident on the room,affecting indoor light,thermal environment and energy consumption.This paper studies the light and thermal environment characteristics of office buildings with louver shading under solar radiation conditions.And,through the quantitative analysis of different indicators such as light and heat environment,the light comfort,thermal comfort to achieve the minimum energy consumption and give a time-optimized control strategy for the inner/outer louver shading angle.This paper takes a west-facing office room in Qingdao as the research object,conducts on-site measurement of the light and thermal environment under different solar radiation conditions,and uses Energy Plus software to simulate the indoor environment and energy consumption,and verifies the correctness of the model and software boundary conditions.On this basis,the variation of the influence of solar radiation on indoor light and thermal environment during the inner/outer louver shading at different angles is analyzed,emphasis is placed on the analysis of the mean radiant temperature(MRT)and PMV affected by solar radiation in the direct and indirect areas of the room.It is found that the mean radiant temperature in direct/indirect areas can be up to 7.14 °C in summer,and it can be up to 6.54 °C in winter.There is a significant difference in the effects of solar radiation on the thermal comfort of people in different areas of the room.As a consequence,considering the indoor light environment,thermal environment and comprehensive energy consumption factors,the time-optimized control strategy of the inner/outer louver shading angle is studied.The indicators of discomfort glare index(DGI),PMV and comprehensive energy consumption were used as comprehensive evaluation indexes of indoor environment to study the variation of indicators under different angles.According to the objective data of indoor environment and energy consumption under typical climatic conditions,the entropy weight method is used to calculate the weight value of each index,and the comprehensive evaluation parameters are established to comprehensively evaluate the control methods of different louver angles.This evaluation parameter can be used to guide the indoor environment operation control under the louver to achieve a balance between comfort and energy saving.Finally,through the re-simulation and analysis of the louver control angles,the effectiveness of the time-lapse control strategy of the inner and outer louver shading angles is verified.