Article
Chemistry, Multidisciplinary
Chun-Hsin Chang, Tun-Ping Teng, Tun-Chien Teng
Summary: This study proposes a method for evaluating the influence of ambient temperature on the optical characteristics and power consumption of a LED lamp used for automotive headlamps. The results show that ambient temperature has a significant effect on the lamp's illuminance and power consumption.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Yashuai Yang, Dangshe Qiu, Yi Zeng, Ruolan Li, Wenju Duan, Rundong Fan
Summary: This paper presents a design scheme for an automobile low-beam light illumination system with a reflector free-form surface. By utilizing the energy grid mapping theory and edge ray theory, as well as the Monte Carlo ray tracing method, the system achieves precise light distribution that meets regulatory requirements, while also having the advantage of a small size.
Article
Chemistry, Analytical
Hui Zhang, Dengfei Liu, Yinwan Wei, Hong Wang
Summary: The proposed design method of asymmetric double freeform surface lens and freeform surface reflector allows for redistribution of light beams in an integrated LED automobile headlamp, meeting the requirements of vehicle regulations while saving space for additional electronic devices to enhance driver safety.
Article
Optics
Jun Ho Lee, Seok Gi Han, Min Ji Jin
Summary: Since the introduction of the first full LED headlamp in 2007, technology has evolved to provide enhanced performance, improved security, and unique aesthetics. However, the height of LED headlamps has been stalled at around 40-60 mm for some time, with recent advancements in miniaturization resulting in a smaller optical opening but a larger housing envelope height.
Article
Instruments & Instrumentation
Chi-Chang Hsieh, Chi-Lung Tsai, Chih-Ching Hung, Hsin-Hung Lin, Tse-Chang Li
Summary: A LED low-beam headlamp system was designed to meet the regulations in FMVSS 108. The system used an ellipsoidal reflector and asymmetric light source floorboard to create cutoff lines in the projected light. It replaced shade components in traditional headlamp systems, improving energy efficiency. By superposing light patterns and using a high-focusing multiple-surface reflector, the system achieved satisfactory illuminance. Compared to halogen headlamps, the LED system used 70% less energy.
SENSORS AND MATERIALS
(2023)
Article
Crystallography
Tzu-Yi Lee, Wei-Ta Huang, Jo-Hsiang Chen, Wei-Bo Liu, Shu-Wei Chang, Fang-Chung Chen, Hao-Chung Kuo
Summary: This study focuses on the innovation of mini light-emitting diode (mini-LED) backlight module designs. By optimizing the Mini-LED structure and utilizing optical simulation software and reinforcement learning algorithms, the illumination uniformity was improved, achieving impressive results.
Article
Thermodynamics
Ich Long Ngo, Seunghwan Bang, Byeong Jun Lee
Summary: This paper presents an experimental study on the thermal performance of SMD-LED chips in car headlamps. A new test model is proposed to examine the effect of key parameters. The results show a correlation between the mean air temperature and the key parameters. A new approach to thermal management can be developed based on these findings.
APPLIED THERMAL ENGINEERING
(2023)
Article
Mathematics, Applied
K. Delendik, N. Kolyago, O. Voitik
Summary: This paper focuses on the development of a cooling system for high-power LED luminaires, utilizing mathematical optimization algorithms and numerical simulation to validate the effectiveness of a heat pipe-based system. The theoretical results were well validated by experimental data and numerical simulation, showing the potential for widespread application in the design of cooling systems for various LED products.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Thermodynamics
Yongfeng Zheng, Zhen Luo, Yanzheng Wang, Zhengyang Li, Jinping Qu, Chuanzeng Zhang
Summary: This study proposes a new method for the topological design of hierarchical structures with high performance in thermal insulation. The method incorporates a three-layer design strategy, considers different microstructures, and employs the floating projection technique to optimize the thermal properties of the structures.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Haicai Lv, Lirong Liang, Yichuan Zhang, Liang Deng, Zhijun Chen, Zhuoxin Liu, Hanfu Wang, Guangming Chen
Summary: A novel three-dimensional spring-like thermoelectric device (S-TED) is proposed, which inherits excellent flexibility, compressibility, and the ability to utilize waste heat under vertical temperature gradient. Compared to conventional TEDs, this device is optimized in contact enhancement, thermal insulation design, and heat dissipation efficiency, achieving high output power.
Article
Thermodynamics
Shahid Ali Khan, Chika Eze, Kejian Dong, Ali Raza Shahid, Mahesh Suresh Patil, Shakeel Ahmad, Iftikhar Hussain, Jiyun Zhao
Summary: This study introduces a novel liquid cooling method to optimize the thermal safety and weight of a prismatic battery cell. Through numerical calculations and a neural network regression model, the optimal design is found, which reduces the battery temperature and lowers the weight of the cooling plate, contributing to the development of lightweight and thermally safe batteries.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Shangsheng Feng, Zhuoran Liu, Baoming Cheng, Shanyouming Sun, Tian Jian Lu, Feng Xu
Summary: LED lightings have made significant contributions to global energy saving, but the overheating issue of LED chips limits their light output and lifespan. A novel design utilizing the entire outer surface of LED bulb as a heat dissipating surface with a chimney and external heat sink has been proposed, optimizing the cooling capacity and improving passive cooling efficiency by 1.57 times compared to conventional designs.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Inorganic & Nuclear
Yunpeng Zhou, Takatoshi Seto, Ziyong Kang, Yuhua Wang
Summary: The study introduced a deep-red emitting phosphor CaMgAl10O17:Mn4+ with an ultra-wide response range, showing a high quantum efficiency of 86.7% and suitable for use as an LED light source for plant growth.
DALTON TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Nathan K. Brown, Benjamin Young, Brett Clark, Ophelia Bolmin, Brad L. Boyce, Philip J. Noell
Summary: This study optimized the topologies of interlocking metasurfaces (ILMs) to maximize strength in tensile and shear loading. Experimental validation showed significant strength increases compared to human intuitive design. Analysis of the optimized topologies revealed the importance of shape optimization in design.
MATERIALS & DESIGN
(2023)
Article
Energy & Fuels
Julius Weiss, Inigo Ortega-Fernandez, Ralf Mueller, Daniel Bielsa, Thomas Fluri
Summary: Single tank thermal energy storage systems based on the thermocline concept have been extensively researched as a cost-effective alternative to molten salt double tank storage systems. However, the discrepancy between theoretical models and actual flow distribution has been identified as a reason for the inability to achieve high cyclic efficiencies predicted in simulations. The optimal placement and geometric characteristics of fluid distributors in the tank play a crucial role in minimizing the initial thermocline thickness and optimizing thermal stratification.
JOURNAL OF ENERGY STORAGE
(2021)
