Characterization of a New 10 kWe High Flux Solar Simulator Via Indirect Radiation Mapping Technique

Abuseada, Mostafa; Ophoff, Cédric; Özalp, Nesrin

doi:10.1115/1.4042246

Cited by 29 publications

(7 citation statements)

References 26 publications

(19 reference statements)

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“…1(a). The concentrated light source is a 10 kW Xenon short arc lamp with Lorentzian intensity distribution [20,21]. The power of the concentrated light source is controlled using a 0-10 V external control voltage.…”

Section: Physical System Modelingmentioning

confidence: 99%

“…In our study, the concentrated light source is partially blocked by three annular tungsten rings (referred to as light blockers) so that only the center of the sample is exposed to the light source. A custom tray tracing code [21] was employed to evaluate the intensity distribution of the concentrated light source as truncated by the light blockers. The simulated intensities with and without truncation are shown in Fig.…”

Section: Physical System Modelingmentioning

confidence: 99%

“…First, the intensity distribution of the concentrated light source is difficult to characterize precisely. Based on a previous study for a similar concentrated light source [21] and our preliminary investigation using a calorimetry method, the estimated intensity distribution width (r solar ) is 0.01 m. We assume a 630% variation associated with r solar . Second, in our study the light blocker temperature T 0 is difficult to measure precisely.…”

Section: Model Sensitivity Analysismentioning

confidence: 99%

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High-Temperature Thermal Diffusivity Measurements Using a Modified Ångström's Method With Transient Infrared Thermography

Abuseada

Alghfeli

et al. 2021

Journal of Heat Transfer

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This work reports a method to measure thermal diffusivity of thin disk samples at high temperatures (900 -1150K) using a modified Angstrom's method. Conventionally, samples are heated indirectly from the surroundings to reach high temperatures for such measurements, and this process is time-consuming, typically requiring hours to reach stable temperatures. In this work samples are heated directly in a custom instrument by a concentrated light source and are able to reach high steady-periodic temperatures in 10 mins, thus enabling rapid thermal diffusivity characterization. Further, existing Angstrom's methods for high temperatures use thermocouples for temperature detection that are commonly attached to samples via drilling and welding, which are destructive to samples and introduce thermal anomalies. In this work we use an infrared camera calibrated to 2000 C for non-contact, non-destructive and data-rich temperature measurements. We present an image analysis approach to process the IR data that significantly reduces random noise in temperature measurements. We extract amplitude and phase from processed temperature profiles and demonstrate that these metrics are insensitive to uncertainty in emissivity. Previous studies commonly use regression approaches for parameter estimation that are ill-posed (i.e., non-unique solutions) and lack rigorous characterization of parameter uncertainties. Here, we employ a surrogate-accelerated Bayesian framework and a 'No-U-Turn' sampler for uncertainty quantification. The reported results are validated using graphite and copper disks and exhibit excellent agreement within 5% as compared to reference values obtained by other methods.

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Section: Physical System Modelingmentioning

confidence: 99%

Section: Physical System Modelingmentioning

confidence: 99%

Section: Model Sensitivity Analysismentioning

confidence: 99%

See 1 more Smart Citation

High-Temperature Thermal Diffusivity Measurements Using a Modified Ångström's Method With Transient Infrared Thermography

Abuseada

Alghfeli

et al. 2021

Journal of Heat Transfer

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“…A concentrated light source (i.e., high flux solar simulator) is used to locally heat a polymer sample with a significantly larger spot size compared to IR lasers, to avoid forming discontinuous graphene structures. This light source is normally used as a platform for various experiments [17] ranging from solar fuels and commodities production [18], photovoltaic device testing [19], and high-temperature material processing [20] and characterization [21]. For photovoltaic device testing, the concentrated light source is usually operated in a controllable flash mode with flashes lasting from few to a hundred milliseconds [19].…”

Section: Introductionmentioning

confidence: 99%

Graphitic surface layer formation on organic substrates for electronics using a concentrated solar simulator

2022

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Heat spreading is an important attribute that improves thermal management and operation of high-performance packages, such as those for solid-state power amplifiers. This attribute can be enhanced through direct transformation of polymers into graphitic films. The present work reports a custom vacuum deposition process that synthesizes thin graphitic layers on organic substrates through direct pyrolysis via concentrated irradiation from a xenon lamp to produce a peak heated zone of approximately 3 cm diameter with a maximum heat flux of 3.2 MW/m$$^2$$ 2 . The light source, replaceable with concentrated terrestrial solar power, provides ultrafast heating of substrates through rapid flashes (< 0.5 s) and improves growth rates over relatively larger areas compared to laser processing, mitigating the issue of porosity in graphitic layers that deteriorate heat spreading capabilities. The enhanced organic substrates are analyzed using Raman and energy-dispersive X-ray spectroscopy, scanning electron microscopy, and thermal diffusivity measurements, indicating graphitic conversion. Graphical abstract

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“…receiver window) of the optical setup was obtained via the indirect heat flux mapping method. Elaboration of this method for the optical setup used in this study is described in Ref [23]…”

mentioning

confidence: 99%

Systematic approach for design optimization of a 3 kW solar cavity receiver via multiphysics analysis

et al. 2020

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Use of Computational Fluid Dynamics (CFD) modeling for solar reactor design optimization is a powerful tool in developing efficient reactors for solar thermochemical applications. CFD models can capture complex multiphase flow dynamics to explain the physics linking the heat transfer and flow dynamics on chemical conversion efficiency and continuous operation of a solar reactor. Flux map and temperature data can be numerically obtained via CFD inside the solar reactor, which is a harsh environment for penetrating measurement tools. In this paper, a CFD analysis of a solar cavity receiver operated with air flow and is directly irradiated by a 10 kWe high flux solar simulator (HFSS) is presented. Radiative heat transfer from the HFSS is modeled by implementing Monte Carlo Ray Tracing (MCRT) for tracking the ray paths from the radiative source to the aperture plane of the receiver. Flux densities were computed at the aperture and validated by experimental heat flux characterization of the solar simulator. The validated MCRT model provided directional information on the radiative flux and was sequentially coupled to the computational fluid domain. Through experimental testing, receiver temperatures up to 1200 K were measured with solar input at the entrance of the cavity of around 3 kW radiative power. Experimentally measured non-uniform temperature distribution in the axial direction was recorded, which developed a hot spot at the backplate of the cavity. Accuracy of the numerical model was validated by comparing the temperature prediction inside the cavity receiver to experimental results. Validated model was then used to conduct a parametric study on the flow configuration to identify run conditions yielding enhanced fluid mixing and improved heat transfer characteristics. The results showed that altering the angle of the main inlet ports proved to be effective in reducing the local hot spot in the back of the receiver. Moreover, results of the parametric study identified the increase of main flow rate as a positive contribution towards temperature uniformity throughout the fluid domain.

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Characterization of a New 10 kWe High Flux Solar Simulator Via Indirect Radiation Mapping Technique

Cited by 29 publications

References 26 publications

High-Temperature Thermal Diffusivity Measurements Using a Modified Ångström's Method With Transient Infrared Thermography

High-Temperature Thermal Diffusivity Measurements Using a Modified Ångström's Method With Transient Infrared Thermography

Graphitic surface layer formation on organic substrates for electronics using a concentrated solar simulator

Systematic approach for design optimization of a 3 kW solar cavity receiver via multiphysics analysis

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