Expressway tunnels are generally located in remote mountainous areas, which are costly for power generation and have high energy conservation requirements. In recent years, LED has largely replaced traditional high-pressure sodium lamps, and the energy saving rate is generally around 30% to 50%.
The new tunnel lighting specification JTG/TD70/2-01-2014 "Design Rules for Highway Tunnel Lighting", which was implemented in the previous year, provides better policy support for LED lighting. In addition, LED lamps can be flexibly dimmed, and combined with intelligent control management, it can save more power and reduce the cost of power supply.
Overall energy saving ideas:
The general tunnel lighting control two modes - day / night, then through the hole inside and outside the brightness detector and flow meter to transmit information to the controller, according to the new standard to reduce the brightness, to achieve energy-saving purposes.
Figure: Segmented illumination of the tunnel
Energy-saving trick 1: dimming according to the brightness outside the hole
Dimming the brightness of different holes in the morning, noon, evening, sunny, cloudy, heavy cloudy days.
According to the new standard: tunnel dice lighting dimming design should meet the following requirements:
Reinforced lighting should be designed according to the brightness and traffic volume outside the hole, and the dimming design of the inlet section, the transition section and the exit section can be carried out. The dimming and grading combination can be carried out according to Table 1.
Energy saving trick 2: dimming according to traffic flow
According to the traffic statistics, the light is dimmed according to the specified value, and if the night illumination is not adjusted to 20-50% brightness.
According to JTG/TD70/2-01-2014: the brightness of the middle section should be according to Table 2.
Energy saving trick three: dimming according to the brightness inside the hole
Dimming according to the brightness inside the hole. Maximize energy savings. The design of the design institute will have a maintenance factor. At the beginning, the brightness is exceeded, so that the information is transmitted to the controller through the brightness detector in the hole, and the brightness is lowered to the national standard, thereby saving energy.
Energy-saving tricks four: the use of LEDs under the new standard can be reduced by the effective brightness!
Energy efficiency standards (new standard increase)
9.2.1 When the LED light source with color rendering index Ra ≥65 and color temperature between 3500~6500K is used for basic tunnel illumination, the brightness can be taken as 50% of the brightness standard listed in Table 6.1.1, but should not be lower than 1.0. Cd/m 2.
Article Description:
The brightness standards currently used in lighting design in most countries of the world and in the world are brightness in the 2° field of view under bright visual conditions, which does not fully reflect the perception of brightness by the human eye.
To this end, the academic community began to apply "intermediate vision theory" and "visual power method for the reaction time of target objects" to study tunnel lighting.
According to the "Reaction Time-based Visual Efficacy Method" experiment, the brightness contrast coefficient of the LED light source to the high-pressure sodium lamp (HPS) light source when the reaction time is equal is obtained, as shown in Table 9-1, and the equivalent brightness of the intermediate light of the LED light source can be calculated. Therefore, the brightness value is correspondingly reduced.
Energy saving project example
Picture: Hubei Jiatong Expressway
Basic principle: 4 loops are respectively controlled to strengthen 1, strengthen 2, basic lighting and emergency lighting.
Figure: Intelligent dimming system
Analysis of energy saving benefits
The data can be seen: using LED retrofit, saving 77% energy compared to the original high pressure sodium lamp
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