Daylighting simulation and optimization of scientific research laboratory based on Ecotect:A case study of the Digital Habitat Laboratory of Hefei University of Technology
[Objective]Daylighting plays a vital role in research laboratories to meet the needs of daily research.Through in-depth investigation and detailed analysis of the Digital Habitat Laboratory of Hefei University of Technology,insufficient light intensity was observed inside the laboratory,especially in the areas away from windows.Additionally,severe glare occurred near windows at noon.To achieve a better understanding of the factors influencing indoor daylighting conditions,we combed the relevant literature and identified four key factors:window size,window-to-ground ratio,glass transmittance,and sunshade measures.Additionally,to explore the specific impact of each of these factors on daylighting,more in-depth research must be conducted to obtain accurate and scientific references for constructing and renovating relevant research laboratories.[Methods]We used the Ecotect program to simulate and analyze several influencing factors.First,the original size of the laboratory side window was used as a benchmark to establish standard reference data.Next,daylighting data were collected when(a)the window width was adjusted,(b)the number of windows was increased,(c)glass was replaced with various materials,and(d)various sunshades were used.Finally,an in-depth quantitative analysis of daylighting data was conducted at three distinct indoor positions near the windows.[Results]Quantitative analysis of the data revealed that when the width of the side window was controlled at 1,100 mm,the indoor daylighting coefficient performed well,and a moderate increase in the window size had less impact on indoor light uniformity.However,after the size exceeded 1,200 mm,it excessively illuminated the area near the windows,which is not conducive to the working environment needs of the laboratory.Moreover,the window-to-ground ratio has a proportional relationship with the indoor lighting coefficient and the illuminance value.As the window-to-ground ratio increased,the indoor lighting area accordingly expanded,improving the indoor illumination level.However,this led to a gradual decrease in lighting uniformity and an increase in indoor contrast,affecting overall comfort.Using single-layer or low-radiation glass effectively improved indoor lighting efficiency.The higher the visible light transmittance of the glass,the greater the stability of light uniformity in the room.Regarding shading facilities,vertical shading had less impact on indoor lighting,whereas horizontal shading significantly reduced the entry of direct light,effectively mitigating indoor glare issues.[Conclusions]Through an in-depth simulation study of the Digital Habitat Laboratory,specific lighting values in the current experimental environment were obtained.Furthermore,simulations were conducted to analyze the changes in lighting values under various influencing factors.Considerably,feasible measures were proposed to improve the quality of the indoor lighting environment.These measures included increasing the number of windows to expand the daylighting area,controlling the window width to 1 000 mm,adding vertical shading facilities to reduce direct light interference,and improving the overall uniformity of indoor lighting.The statement offers a pragmatic foundation for future investigations in laboratory lighting design.
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