Parameter estimation in dynamic plane source method

Malinarič, Svetozár

doi:10.1088/0957-0233/15/5/005

Cited by 37 publications

(11 citation statements)

References 7 publications

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“…Previous works on the former aspect focused on the sensitivity of the input parameters and the data fitting procedure based on the original analytical model, but could not explain the overestimation of k in TI materials. [21][22][23][24][25][26] In the latter aspect, several publications investigated the accuracy and performance of commercial TPS devices based on numerical simulations to study the effect of the sensors on the TPS measurement for bulk or thin film 20,[27][28][29][30][31] and the error due to thermal radiation in semitransparent sample. 17,33 However, these researches provide no systematic investigation on the sensor geometric parameters and sample thermal properties.…”

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confidence: 99%

Analysis and improvement of the hot disk transient plane source method for low thermal conductivity materials

Zheng

Kaur

Dames

et al. 2020

International Journal of Heat and Mass Transfer

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The hot disk transient plane source (TPS) method is a widely used standard technique (ISO 22007-2) for the characterization of thermal properties of materials, especially the thermal conductivity, k. Despite its well-established reliability for a wide variety of common materials, the hot disk TPS method is also known to suffer from a substantial systematic errors when applied to low-k thermal insulation materials, because of the discrepancies between the idealized model used for data analysis and the actual heat transfer process. Here, we present a combined numerical and experimental study on the influence of the geometry of hot disk sensor on measured value of lowk materials. We demonstrate that the error is strongly affected by the finite thickness and thermal mass of the sensor's insulation layer was well as the corresponding increase of the effective heater size beyond the radius of the embedded metal heater itself. We also numerically investigate the dependence of the error on the sample thermal properties, confirming that the errors are worse in low-k samples. A simple correction function is also provided, which converts the apparent (erroneous) result from a standard hot disk TPS measurement to a more accurate value. A standard polyimide sensor was also optimized using both wet and dry etching to provide more accurate measurement directly. Experimentally corrected value of k for Airloy® x56 aerogel and a

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confidence: 99%

Analysis and improvement of the hot disk transient plane source method for low thermal conductivity materials

Zheng

Kaur

Dames

et al. 2020

International Journal of Heat and Mass Transfer

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“…In case of the best fit, the thermal conductivity λ will be determined. The method of fitting based on the least-squares procedure was described in detail (Malinarič, 2004a;Malinarič, 2007b).…”

Section: Methodsmentioning

confidence: 99%

Basic thermal properties and geometric characteristics of wood and oriented strand boards used in low-energy buildings

Kotoulek¹,

Malínek²,

Božíková³

et al. 2018

J Proc Ener Agri

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This paper deals with the thermal properties and densities of selected wood types and oriented strand boards used in low-energy buildings. Basic thermophysical parameters such as thermal conductivity, as well as the density of each sample, were measured in the study. The thermal conductivity of the samples was measured by the transient method, i.e. the extended dynamic plane source (EDPS) method. The EDPS method is a modification of the dynamic plane source method for low thermally conductive materials. A total of two identical disc-shaped samples of the material tested and two metal blocks of sufficient geometrical size were enrolled in the study. In the first measurement series, the thermal conductivity of the samples was measured at a constant laboratory temperature of 20 °C, and the measurement was performed 100 times for each sample. The second measurement series was focused on the density determination of the material tested. The densities of the wood and oriented strand board samples were calculated from the geometric dimensions and mass of the samples measured. The results obtained were statistically processed. Furthermore, the experimental results pertinent to the thermal conductivity of the wood types tested were within the range of 0.103-0.275 W.(m.K)-1 , whereas the thermal conductivity values of the oriented strand board samples ranged from 0.109 to 0.129 W.m-1 .K-1. The present results are characteristic of the wood obtained from Slovak timber harvesting localities, as well as of wood products made from wood waste.

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“…Parameter β defines imperfect heat transfer, and ierfc is an integral of error function. Values of thermal conductivity λ and characteristic time θ are gathered using the parametric fitting of real measured dependence of temperature on time using equation (1) [38]. Subsequently, thermal diffusivity coefficient is calculated using equation (2).…”

Section: Experimental Apparatusmentioning

confidence: 99%

Applying the EDPS Method to the Research into Thermophysical Properties of Solid Wood of Coniferous Trees

Krišťák

Igaz

Ružiak

2019

Advances in Materials Science and Engineering

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e results of using the EDPS (extended dynamic plane source) method to determine thermophysical properties of solid wood of coniferous trees growing in Slovakia with 0% and 12% equilibrium moisture content are presented in the paper. Solid wood of two different tree species: Norway spruce (Picea abies L.) and Scots pine (Pinus sylvestris L.) was used in the research. e research was carried out independently in three anatomical planes. Coefficients of thermal conductivity, thermal diffusivity, and specific heat capacity were determined following the research. Comparing the research results to the values determined by other authors and already published models to calculate individual parameters, the fact that the data gathered using the EDPS method can be accepted in case of all studied thermophysical properties can be stated.

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Parameter estimation in dynamic plane source method

Cited by 37 publications

References 7 publications

Analysis and improvement of the hot disk transient plane source method for low thermal conductivity materials

Analysis and improvement of the hot disk transient plane source method for low thermal conductivity materials

Basic thermal properties and geometric characteristics of wood and oriented strand boards used in low-energy buildings

Applying the EDPS Method to the Research into Thermophysical Properties of Solid Wood of Coniferous Trees

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