Heat Flux Control in Non-stationary Conditions for Industry Applications

Декуша, Леонід; Kovtun, Svitlana; Dekusha, Oleg

doi:10.1109/ukrcon.2019.8879847

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…Table 2 presents the measurement results of the device for express control of the thermal conductivity, processed according to the standard procedure and by the heat flow meter apparatus [21], made according to ISO 8301 [2]. To improve the processing measurement information, wavelet transform was used, which allowed one to select a useful signal in the unstable mode.…”

Section: Resultsmentioning

confidence: 99%

“…To compare the measurement results of the express control of the thermal conductivity coefficient of thermal insulation materials, a precision information-measuring system was used [21]. The information-measuring system's principle of operation is determined by the standard symmetric measuring cell structure [2] using two identical thermoelectric heat flux meters.…”

Section: Experimental Equipment and Methodsmentioning

confidence: 99%

“…The technical characteristics of the heat flow meter apparatus [21] are Sample size of 300 × 300 × (10 . .…”

Section: Experimental Equipment and Methodsmentioning

confidence: 99%

“…In the measurement range from 0.2 to 1.4 W/(m•K), the samples with well-studied thermal conductivity made of organic and optical glass were used. Low-conductivity materials in the range of values less than 0.2 W/(m•K), whose thermal conductivities are known from the results of previous studies, were used [2,21].…”

Section: Studied Specimensmentioning

confidence: 99%

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Prospects for the Application of Wavelet Analysis to the Results of Thermal Conductivity Express Control of Thermal Insulation Materials

et al. 2021

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This article discusses an express control method that allows in situ measurements of the thermal conductivity of insulation materials. Three samples of the most common thermal insulation materials, such as polyurethane, extruded polystyrene, and expanded polystyrene, were studied. Additionally, optical and organic glasses were investigated as materials with a stable value of thermal conductivity. For the measurement of thermal conductivity, the express control device, which implements the differential method of local heat influence, was used. The case studies were focused on the reduction of fluctuations of the measured signals caused by different influencing factors using wavelet transform. The application of wavelet transform for data processing decreased the thermal conductivity measurement’s relative error for organic glass SOL and optical glasses TF-1 and LK-5. The application of wavelet transform thermal conductivity measurement data for polyurethane, extruded polystyrene, and expanded polystyrene allowed to reduce twice the duration of express control while maintaining the same level of measurement error. The results of the investigation could be used to increase the accuracy in express control of the thermal conductivity of insulation materials by improving the data processing. This approach could be implemented in software and does not require a change in the design of the measuring equipment or the use of additional tools.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Equipment and Methodsmentioning

confidence: 99%

“…The technical characteristics of the heat flow meter apparatus [21] are Sample size of 300 × 300 × (10 . .…”

Section: Experimental Equipment and Methodsmentioning

confidence: 99%

Section: Studied Specimensmentioning

confidence: 99%

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Prospects for the Application of Wavelet Analysis to the Results of Thermal Conductivity Express Control of Thermal Insulation Materials

et al. 2021

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“…High-intensity flux measurements are also required for non-CSP applications, such as industrial process heat (IPH), pulsed-power research, aerospace R&D, and defense R&D. IPH applications, such as those in manufacturing, plastic, textile, food, paper, chemistry, and surface treatment industries, require heat flux measurements to understand system thermal losses and minimize total energy consumption [5][6][7]. Pulsed-power research requires high heat flux measurements, >2,900 kW/m 2 , to quantify the radiative energy transferred from arc flashes and inform worker safety standards [8].…”

Section: Introductionmentioning

confidence: 99%

Flux Sensor Measurement and Calibration Requirements for High-Intensity Heat Flux Applications

McLaughlin,

Laubscher,

Schroeder

et al. 2024

SolarPACES Conf Proc

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Stakeholders of CSP and non-CSP high-intensity broadband flux measurements were surveyed and interviewed to obtain flux sensor design and calibration requirements. Existing sensor technologies and existing calibration facilities were then compared against this standard. Stakeholders require a flux sensor designed for >5,000 kW/m2 flux measurements, >1,000 life cycles, <500 ms response time, >60-minute exposure at maximum flux, and <5% measurement uncertainty. Stakeholders also require a sensor with minimal cost, short procurement lead time, and a high-intensity broadband flux calibration. Commercial CSP stakeholders primarily rely on infrared (IR) temperature measurements of receiver equipment to control CSP plant process operation, whereas CSP research and development (R&D) and non-CSP stakeholders rely on accurate flux gauge measurements for a variety of applications. It was determined that existing flux sensor technologies and calibration facilities do not comprehensively meet stakeholder needs. This study suggests a more robust circular foil gauge with a high-intensity solar flux calibration comprehensively meets stakeholder flux measurement needs. Improved circular foil gauge designs and an improved flux sensor calibration facility are discussed.

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