Effects Of The External Blinds On The Indoor Light Environment And Energy Consumption In Different Light Climates Zone

With the rapid growth of Chinese economy,urbanization and industrialization,building energy consumption increased rapidly,building energy conservation had become an important research topic in China.While the building exterior shade was an important research project of energy conservation,successful building exterior shading design can effectively reduce building energy consumption and without affecting indoor lighting requirements to achieve maximize the use of natural light.Many scholars took a large number of comprehensive study concerning the horizontal blinds on the window,however,research is relatively less about the construction of the southern window to set the horizontal blinds shade on the five light climate for of large-depth office the indoor lighting and light environment and its impact of energy consumption.Therefore,based on the study of the effects of different blinds angles and spacing,this paper has study the indoor lighting,artificial lighting and building energy consumption in building southern window of five light climates.The research content of paper mainly include the following aspects:(1)Analyzing the factors related to indoor natural lighting and building energy consumption,the shade device form,performance parameters and research model were determined.(2)Based on the Ecotect lighting simulation software,the indoor illumination intensity,illumination uniformity as light environmental evaluation index were used to analyze the effects of the horizontal blinds of different angles and different spacing on the indoor lighting and light environment in five light climates.(3)Analyzing the illuminance distribution of the natural daylight in the five light climates when blinds set at the angle of 15° and the spacing of 180 mm,at the same time,when combined with artificial lighting,energy saving rate of annual lighting energy consumption of using the natural light area and part of the use of natural light area were respectively calculated.(4)Using the DesignBuilder calculation software,this paper analyzed different angles and different space of horizontal outside shade blinds for influences and energy saving effects of indoor annual lighting energy consumption,air conditioning energy consumption,heating energy consumption and comprehensive energy consumption.From the above aspects of the study,the main conclusions of this paper are:(1)The indoor illumination uniformity increases with the increase of the louvers angle and reduces with the increase of the louvers spacing.When the louvers are set different spacing,the area of artificial lighting needed to open were reduced for five cities.(2)Natural lighting combined with artificial lighting power consumption was significantly reduced and the reduction rate is between 30.1% and 55.7%.(3)We found the energy saving effect of different light climatic zones when setting different louvre angle comparison to no shade,the sort is about the total building energy consumption and the energy saving rate of total building energy consumption: Guangzhou(class IV)> Chengdu(Class V)> Kunming(Class II)> Zhengzhou(Class III)> Lhasa(Class I).