Lifetime Decrease of Halogen Lamps for Automotive by Duty Cycle Stress

Cho, Youngjin; Kim, Jae-Jung

doi:10.1109/tr.2011.2135730

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…Solar energy consists of radiant light and heat from the Sun [36]. To simulate solar radiation for the test setups, halogen lamps were used since they emit both heat and light with color characteristics similar to that of the Sun [37]. Specifically, two halogen lamps (GE SUPER CP60 EXC VNS 230V|1000W G16d 3200K|General Electric (Schenectady, NY, USA) combined with dimmer UNI BAR Elation professional) were positioned along the longitudinal axes of each test box.…”

Section: Methodsmentioning

confidence: 99%

Performance Assessment of Two Different Phase Change Materials for Thermal Energy Storage in Building Envelopes

et al. 2023

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To meet the 2050 EU decarbonization goals, there is a need for new and innovative ideas to increase energy efficiency, which includes reducing the energy consumption of buildings and increasing the use of on-site renewable energy sources. One possible solution for achieving efficient thermal energy transition in the building sector is to assign new functionalities to the building envelope. The building envelope can function as a thermal energy storage system, which can help compensate for irregularities in solar energy availability. This can be accomplished by utilizing phase change materials as the energy storage medium in the building envelope. In this paper, two phase change materials with different melting temperatures of 21 °C and 28 °C are compared for their application in a dynamic solar building envelope. Both experimental and numerical studies were conducted within the scope of this study. The laboratory testing involved simulating the conditions of the four seasons through steady-state and dynamic experiments. The performance of the phase change materials was evaluated using a small-scale PASLINK test stand that imitates indoor and outdoor conditions. A numerical model of a small-scale building envelope was created using data from laboratory tests. The purpose of this model was to investigate how the tested phase change materials perform under different climate conditions. The experimental findings show that RT21HC is better at storing thermal energy in the PCM and releasing it into the indoor area than RT28HC. On the other hand, the numerical simulation results demonstrate that RT28HC has an advantage in terms of thermal storage capacity in climates found in Southern Europe, as it prevents overheating of the room.

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Section: Methodsmentioning

confidence: 99%

Performance Assessment of Two Different Phase Change Materials for Thermal Energy Storage in Building Envelopes

et al. 2023

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“…Two setups were tested simultaneously using two halogen lamps to simulate solar irradiance. The application of halogen lamps for solar radiation simulation was based on studies [26] and [27] that describe lamps' characteristics and properties and indicate their similarities to the sun's light. Comparison of setups is based on the analysis of temperature changes in phase change material.…”

Section: Experimental Testing Stands and Measurementsmentioning

confidence: 99%

The Effect of Fresnel Lens Focal Point Location on Heat Transfer in Phase Change Material (PCM) Enhanced Dynamic Solar Facade

Narbuts

Blumberga

Zundāns

et al. 2022

Environmental and Climate Technologies

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In recent years, the demand for energy-efficient technological solutions in the building sector has risen significantly worldwide. The exploitation of phase change material as a medium for thermal energy storage in building envelopes has increased due to its superior properties. There is still a knowledge gap to cover in the way to the effective solar thermal energy storage in the building envelope – to enhance the heat transfer, to reduce the heat loss, etc. This paper deals with the optimisation of heat transfer using a solar concentrator (Fresnel lens). This study examines the effect of Fresnel lens focal point location on heat transfer in a dynamic solar facade prototype that stores thermal energy in phase change material. Nine different setups (solar façade compositions) were tested in the laboratory – two parameters with three alternatives each. Testing conditions simulate the relevant Northern Europe climate. By changing the air gap configuration and location of the Fresnel lens focal point, the heat transfer to phase change material was observed by measuring temperatures in the phase change material container using five thermocouples. The results show the improved thermal performance in test modules with larger cone diameter by 7.2 % and Fresnel lens focal point positioning closer to the back of the phase change material container by 5.4 %.

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“…Halogen lamps have the advantages of high power and low cost, but they have the disadvantages of short lifetime, low efficiency and generating large amounts of heat. Furthermore, a fatal point of halogen lamps in such systems is that they are not suitable for modulation because of the reduced lifetime (Cho and Kim, 2011). Yet, the modulation of the signals is necessary to compensate for the ambient light (Casselgren et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Near-infrared LED system to recognize road surface conditions for autonomous vehicles

Zhang

Azouigui

Sehab

et al. 2022

J. Sens. Sens. Syst.

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Abstract. The driving safety of autonomous vehicles will strongly depend on their ability to recognize road surface conditions such as dry, wet, snowy and icy road. Currently, the existing investigations to detect road surface conditions still have limitations in daytime and nighttime conditions. The objective of this paper is to propose and develop a new system with three near-infrared (NIR) LED sources. This choice is based on the advantages of LED sources over laser diodes. They are less sensitive to temperature and have lower costs. Considering these advantages, the feasibility of the LED system to recognize road surface conditions is investigated. For this, the appropriate wavelengths of the LED tri-wavelength source are first computed from experimental data taking into account the specific LED spectral shape. In addition, the effect of the spectral bandwidth of the LED sources on the system performance is theoretically studied. Finally, the NIR LED system with the LED sources at 970, 1450 and 1550 nm is experimentally tested and validated with an incident angle from 78.7 to 86.2∘. According to the results of the experiments, the accuracy of the classification of snow, wet and water can reach 97 %, while the accuracy of the dry and wet road surface conditions is respectively 73 % and 68 %.

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Lifetime Decrease of Halogen Lamps for Automotive by Duty Cycle Stress

Cited by 8 publications

References 4 publications

Performance Assessment of Two Different Phase Change Materials for Thermal Energy Storage in Building Envelopes

Performance Assessment of Two Different Phase Change Materials for Thermal Energy Storage in Building Envelopes

The Effect of Fresnel Lens Focal Point Location on Heat Transfer in Phase Change Material (PCM) Enhanced Dynamic Solar Facade

Near-infrared LED system to recognize road surface conditions for autonomous vehicles

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