The construction and installation of street lighting is an important element in the modernization of China’s cities.Besides,it also plays an important role in raising the living standards of the people.In recent year...The construction and installation of street lighting is an important element in the modernization of China’s cities.Besides,it also plays an important role in raising the living standards of the people.In recent years,with the technological and economic development,smart street lighting has gradually emerged.Key functions of smart street lighting include road illumination,cultural promotion,meteorological monitoring,public broadcasting,and 5G micro-base stations.The overall quality of smart street lighting construction directly impacts the effectiveness of urban development and the city’s comprehensive growth.This paper analyzes the concept of smart street lighting,its advantages and disadvantages,the functionalities of smart street light systems,and the application of smart street lighting in urban road illumination.展开更多
Energy conservation is the effort to reduce the overconsumption of energy by the usage of less energy services.Energy conservation could be user oriented or industry sector oriented.One of these sectors is the streetl...Energy conservation is the effort to reduce the overconsumption of energy by the usage of less energy services.Energy conservation could be user oriented or industry sector oriented.One of these sectors is the streetlighting-major energy consumer in the town-forming nearly 30%of each country’s consumption.Intelligent designed management of streetlighting not only reduces the energy consumption of the town,but also increases the public safety and the wellbeing.The article focuses the management of IoT for streetlighting in smart city.This is the first stage of project“Service management for IoT in streetlighting”.While the basic management principles are efficiency and fairness,the requirements of all actors must be defined.On the base of requirements,the authors synthesize the management functions with selected granularity.The chosen methodology is unified modelling language(UML):use case diagrams.The models are intended to business developers,university professors,and students.展开更多
Thermal management is a critical challenge for semiconductor light-emitting diodes(LEDs),as inadequate heat dissipation reduces luminous efficiency and shortens the devices’lifespan.Thus,there is an urgent need for m...Thermal management is a critical challenge for semiconductor light-emitting diodes(LEDs),as inadequate heat dissipation reduces luminous efficiency and shortens the devices’lifespan.Thus,there is an urgent need for more effective cooling strategies to enhance the energy efficiency of LEDs.LED streetlights,which operate primarily at night and experience high chip temperatures,could benefit greatly from improved thermal management.In this study,we introduce a sky-facing radiative cooling strategy for outdoor LED streetlights,an innovative yet less explored approach for thermal management of optoelectronics.Our method employs a nanoporous polyethylene(nanoPE)material that possesses both infrared transparency and visible reflectivity.This approach enables the direct release of heat generated by the LED through a sky-facing radiative cooling channel,while also reflecting a significant portion of the light back for illumination.By incorporating nanoPE as a cover for sky-facing LED lights,we achieved a remarkable temperature reduction of 7.8°C in controlled laboratory settings and 4.4°C in outdoor environments.These reductions were accompanied by an efficiency improvement of approximately 5%and 4%,respectively.This enhanced efficiency translates into substantial annual energy savings,estimated at 1.9 terawatt-hours when considering the use of LED streetlights in the United States.Furthermore,this electricity saving corresponds to a reduction of approximately 1.3 million metric tons of CO_(2) emissions,equivalent to 0.03%of the total annual CO_(2) emissions by the United States in 2018.展开更多
文摘The construction and installation of street lighting is an important element in the modernization of China’s cities.Besides,it also plays an important role in raising the living standards of the people.In recent years,with the technological and economic development,smart street lighting has gradually emerged.Key functions of smart street lighting include road illumination,cultural promotion,meteorological monitoring,public broadcasting,and 5G micro-base stations.The overall quality of smart street lighting construction directly impacts the effectiveness of urban development and the city’s comprehensive growth.This paper analyzes the concept of smart street lighting,its advantages and disadvantages,the functionalities of smart street light systems,and the application of smart street lighting in urban road illumination.
文摘Energy conservation is the effort to reduce the overconsumption of energy by the usage of less energy services.Energy conservation could be user oriented or industry sector oriented.One of these sectors is the streetlighting-major energy consumer in the town-forming nearly 30%of each country’s consumption.Intelligent designed management of streetlighting not only reduces the energy consumption of the town,but also increases the public safety and the wellbeing.The article focuses the management of IoT for streetlighting in smart city.This is the first stage of project“Service management for IoT in streetlighting”.While the basic management principles are efficiency and fairness,the requirements of all actors must be defined.On the base of requirements,the authors synthesize the management functions with selected granularity.The chosen methodology is unified modelling language(UML):use case diagrams.The models are intended to business developers,university professors,and students.
基金supported by a baseline from the King Abdullah University of Science and Technology(BAS/1/1415-01)the Carbon Circulate Initiative(REI/1/5218-01)+1 种基金supported by FutureWei’s gift fund to KAUST:radiative cooling and thermal management materials for consumer electronics(GIF/5/5705-01)We appreciate Mr.Lulin Zhang from Shenzhen Senior Technology Material Co.,Ltd.,our industrial partner,for his valuable contribution to fabricating the customized nanoPE film for this study.
文摘Thermal management is a critical challenge for semiconductor light-emitting diodes(LEDs),as inadequate heat dissipation reduces luminous efficiency and shortens the devices’lifespan.Thus,there is an urgent need for more effective cooling strategies to enhance the energy efficiency of LEDs.LED streetlights,which operate primarily at night and experience high chip temperatures,could benefit greatly from improved thermal management.In this study,we introduce a sky-facing radiative cooling strategy for outdoor LED streetlights,an innovative yet less explored approach for thermal management of optoelectronics.Our method employs a nanoporous polyethylene(nanoPE)material that possesses both infrared transparency and visible reflectivity.This approach enables the direct release of heat generated by the LED through a sky-facing radiative cooling channel,while also reflecting a significant portion of the light back for illumination.By incorporating nanoPE as a cover for sky-facing LED lights,we achieved a remarkable temperature reduction of 7.8°C in controlled laboratory settings and 4.4°C in outdoor environments.These reductions were accompanied by an efficiency improvement of approximately 5%and 4%,respectively.This enhanced efficiency translates into substantial annual energy savings,estimated at 1.9 terawatt-hours when considering the use of LED streetlights in the United States.Furthermore,this electricity saving corresponds to a reduction of approximately 1.3 million metric tons of CO_(2) emissions,equivalent to 0.03%of the total annual CO_(2) emissions by the United States in 2018.
