| Ordinary classrooms are the places where students stay the longest.The quality of the light environment is related to the physical and mental health of students.Increasing the utilization of natural light in the classroom is beneficial to improving student performance,alleviating fatigue,and saving energy.At present,there are many daylight optimization technologies for the side window building space,but there is less research work on the daylighting system suitable for cloudy areas such as Chongqing.This article takes general classrooms with one-side windows in universities in Chongqing as the research object,and analyzes their problems in natural lighting through field investigations.Through literature research on lighting systems at home and abroad,the optimal design strategy for classroom lighting environment is proposed,and a new type of modular side with high performance,controllable cost,convenient maintenance and easy installation is developed,which is suitable for overcast areas such as Chongqing.Window lighting system.The principle is to use the reflection of light to redirect the light near the window to the ceiling,and then use the diffuse reflection of the ceiling to introduce the light into the depths of the classroom,control the excessive light in the near window area of the classroom and increase the light level in the far window area,and improve the single-side window The uneven distribution of light in the depth of the classroom improves the utilization of natural light.The system consists of three main parts,namely light louver as the core component,high-transmittance daylighting windows and light shelf as additional daylighting components,and perforated curtains as additional sunshade components.A three-stage design is adopted to divide the window into an upper high-transmittance daylighting window and a lower transmittance viewing window.The upper section is equipped with daylighting shutters and the high-transmittance double-layer glass is used to improve the dustproof performance of the system,and the middle section is set up with light shelf.The board improves the ability to collect natural light,and a perforated curtain is set in the lower section to improve the shading performance of the near window area.Using daylighting simulation software such as radiance and daysim,from the annual illuminance level and visual comfort indicators,through the comparative experiment method and genetic optimization algorithm to study the performance of the three main components of the combined side window daylighting system and its suitability for Chongqing The best design parameters for the region.The performance trends of different factor levels of light louver in classrooms of different sizes have a high consistency.The daylighting performance first increases and then decreases with the increase of the angle.With the increase of the width ratio in the south-facing classroom Gradually worsening in the north-facing classroom,it is first increased and then decreased.The blade width has no significant impact on the performance of light louver and can be adjusted according to actual conditions;the lower the installation height of light louver within the allowable range,the better the lighting effect.According to research,Chinese youth physical data and related building codes,it is recommended to set it at a height of 2.2 meters.The north-facing classroom is more suitable for CPC curved reflector components,and the south-facing classroom is more suitable for flat reflector components.When the perforated shading curtains are opened throughout the day from May to August in Chongqing when the sunshine is strong,whether it is south-facing or north-facing classrooms,the lighting effect at the near and far windows has been further improved,and 50% of the perforation rate is in the south.Both the facing and north facing classrooms performed best.The installation of a combined side window lighting system can significantly improve the natural lighting quality of south and north classrooms,and the improvement of north-facing classrooms is even greater.The UDI450＿2000lx in the south-facing classroom increased by about 25% to 70.2%,of which the UDI450＿2000lx in the near window area increased by about 142%,and the far window area increased by about 20%.The UDI450＿2000lx in the north-facing classroom increased by about 31%to 81.5%,of which the UDI450＿2000lx in the near window area increased by about102%,and the far window area increased by about 68%.And the possibility of glare is greatly reduced.The UDI>2000lx of the south-facing classroom can be controlled below 33%,and the north-facing classroom can be controlled below 8%.Finally,the actual performance of the combined side window daylighting system is verified by the scale model method.Provide theoretical and actual measurement basis for daylighting optimization design of single-side window building space.The results show that the daylighting system can significantly improve the light environment of ordinary classrooms in Chongqing even in cloudy days.It can increase the illuminance of the far window area by 40%～43%,and the effective incident depth of natural light can also be increased from 4m to 5m from the window.,Verified the effectiveness of the daylighting system.The main research work and results of this paper are as follows:(1)Through field research,summarize the problems in daylighting of ordinary classrooms with single side windows in Chongqing universities;(2)Propose a new type of combined side window daylighting system and its performance The influencing factors are researched,and the best design combination suitable for Chongqing area is obtained;(3)The effectiveness of the daylighting system is verified by the scale model experiment method,which can better improve the daylighting effect of ordinary classrooms with single-side windows in colleges and universities.High actual promotion and application value. |
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