Design Of Sunlight Intelligent Lighting System For Underground Construction

At present, The building energy consumption has achieve about 30% of whole society energy consumption of our country, in which illumintation energy consumption accounts for about 20% to 40% in total.The underground space of buildings has greater illumination power consumption because of under the environment without nature lighting for long time. Using sunlight illumination is an important inprove direction for building energy conservation. Currently the underground construction illumitation use sunlight can be divided into indirect mode(light-electricity-light) and direct mode(light to light). Photovoltaic lighting system is the indirect way which through the light-electricity-light energy conversion to lighting. I has a stable effect and free from sunshine time limit, etc. but the system costs is higher and the energy conversion efficiency is low. Direct mode can be divided into traditional mode(such as open lighting window) and a transfer mode(using light reflects and anaclasis to collect and transfer sunlight into the underground space). The traditional mode has low investment cost and low maintenance costs, it can be implement easily, but also has poor lighting effect and big limitation, while the other mode has a higher light energy utilization rate and investment cost. At present, there is no way can be satisfactory in costing, energy utilization, and lighting effects.In this paper, the designed system is a complementary system which colligates sunlight direct lighting and electric light source lighting, the system mainly use sunlight direct lighting, electric light source lighting is assist, it can be mutual complementation and auto adjustment according to the reality situation, so as to obtain much better lighting effect and satisfy more lighting situation. At the same time, the system makes every effort to satisfy the requirement of building lighting design in the cases, reduce the design cost, raise the utilization ratio of light energy.In this paper, the main work can be summarized as the following several aspects:1) To complete the overall scheme of the underground building sunlight lighting system design. Sunlight direct lighting part mainly solve the lighting demand of underground space during the day, which is the main part of the system, including optical collector, light, reflector, light pipe, diffuse lighting terminal and the corresponding automatic control system. Collector(poly dimmers) is used to implement the environment under the condition of insufficient light, make the system can collect more sunlight and optional parts belong to the system.Light guide and mirrors are used to implement the different direction of the sun’s rays directed to the optical tube, is the realization of sun lighting is an important part of system.Light pipe is embedded in the architecture of optical transmission channel, diffuse terminal is to achieve let lighting space without glare and uniform illumination device, automatic control system is responsible for the normal operation of the whole system and lighting switch, including signal acquisition and processing, gear drive control, etc.2) Complete mechanical structure design and debugging of the system is mainly mechanism. Achieve convergence collector and adjust the function of the sunlight, the key to realize the light guide cooperate with mirror can effectively the directional transmission of parallel rays from the sun, sunlight in the optical tube to a minimum to reduce losses in the transmission path.3) To complete the corresponding hardware and software design of the control system. Light guide and mirror with light transmission and intelligent dimming is controlled by the corresponding control system implementation, the whole control system including hardware and software design of each module to realize the collection of accurate sunlight and signal processing, the drive motor to complete the corresponding mechanical device type photoelectric tracking and depending on the trajectory tracking, monitoring and display, intelligent dimmer and so on function, achieve finally realize intelligent lighting of sunlight in the underground buildings.