Syudy On Luminaire Installation Parameters Optimization Of Highway Tunnel Lighting System

With the rapid development of highway in our country, the number and scale of highway tunnels have entered the front row of the world, the energy consumption also increases year by year, the lighting cost of highway tunnels has become a heavy economic burden on the operation departments. The tunnel interior zone is the longest part of the tunnel, and the longer of the tunnel, the longer of the interior zone. The used lighting lamps number in tunnel interior zone is the largest, the lighting energy consumption accounts for the largest proportion of total consumption, therefore, reducing energy consumption of tunnel interior zone would significantly reduce total energy consumption of tunnel lighting. The study on tunnel lighting energy-saving in our country is mainly focused on the lighting control and relatively less on the optimization of luminaire-installation-parameters(LIPs). In this paper, lighting energy-saving of tunnel interior zone will be studied by the optimization of LIPs to maximize the reduction of energy consumption in the premise of meeting the basic requirements of the tunnel lighting.Based on road tunnel lighting design specifications, the parameters-optimization-models(POMs) of central luminaire distribution, symmetrical luminaire distribution, stagger luminaire distribution, offset-of-vault luminaire distribution and backlighting luminaire distribution were established, with luminaire installation height, longitudinal installation spacing, crosswise installation spacing, installation angle and luminaire power as optimization parameters, with minimum total power consumption of lighting system as objective function, with illuminance of tunnel road surface meeting the lighting requirement as constraint conditions.Yanlieshan tunnel interior zone of Jiujing highway was taken as example for the study object, LED lights were adopted, the optimal LIPs and the illuminance at every calculated point of the tunnel road surface were obtained by the POMs of central luminaire distribution, symmetrical luminaire distribution, stagger luminaire distribution, offset-of-vault luminaire distribution and backlighting luminaire distribution, respectively, comparisons with the specification requirements of “Guidelines for Design of Lighting of Highway Tunnels” show that the illuminance and illuminance uniformity still satisfy the lighting requirement after the LED tunnel lamps’ light attenuate 30%. The total lighting power of every luminaire-distribution-style(LDS) with corresponding optimal LIPs were compared, results showed that the central LDS is more energy-efficient than the offset-of-vault LDS for single row luminaire distribution, the symmetrical LDS is more energy-efficient than the stagger LDS for double row luminaire distribution; every luminaire-distribution-program(LDP) has significantly more energy conservation than the original and the transformed LDPs. A three-dimensional simulation model of Yanlieshan tunnel was established in Dialux software, LED lighting systems were designed in the tunnel simulation model and simulation experiments were made based on the optimal LIPs of every LDS, the simulation values are very close to the optimization calculated values, the maximum error of minimum illuminance of tunnel road surface is less than 3%, and the minimum simulation illuminance values of tunnel road surface basically meet the specification lighting requirements, which proves correctness of the POMs. The influences of single parameter variation, such as luminaire installation height, longitudinal installation spacing, crosswise installation spacing and installation angle on the lighting effect of tunnel road surface were studied by simulation experiments.Economy of the optimal LDP of every LDS in the tunnel interior zone was analysied, the total cost of every LDS after lamps’ serving 100000 hours was estimated, respectively, and the total cost comparison of all LDPs with the original LDP and the transformed LDP, the results show that every optimal LDP can saves significantly more total cost than the original and the transformed LDPs, and has higher economic benefit.