Measurement of thermophysical properties of polyurethane foam insulation during transient heating

Venkatesan, G.; Jin, G. P.; Chyu, Ming‐Chien; Zheng, J. X.; Chu, Tse-Yao

doi:10.1016/s1290-0729(00)01202-3

Cited by 22 publications

(10 citation statements)

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“…This allowed comparing our results with reference data for polyurethane published by National Institute of standards and Technology (NIST), USA, 12 and Sandia National Laboratory USA. 13 As can be seen from Figure 2, ITL data are in the scatter range of the reference data for polyurethane. The average curve for specific heat, as measured at ITL, is more close to the NIST standard reference data, and the difference is not more than 1%–2%.…”

Section: Test Resultsmentioning

confidence: 71%

Influence of temperature and mechanical compression on thermophysical properties of car interior foam plastics insulation

Kolich

Hoke

Dooge

et al. 2012

Journal of Elastomers & Plastics

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The thermophysical properties of interior insulation in cars can depend strongly on mechanical compression of the insulation. No data exists presently on such dependence for this insulation. The main aim of this work was to measure the thermal conductivity and specific heat of different car interior parts (seat cushion, back cushion and leather–foam cover) in a temperature range of −20°C to +60°C and at four different compression values of 0%, 20%, 40% and 60%. Due to complicated mechanisms of material’s structure deformation under compression, theoretical predictions of these dependencies are very complicated. Therefore, experimental results have both scientific and practical interest.

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Section: Test Resultsmentioning

confidence: 71%

Influence of temperature and mechanical compression on thermophysical properties of car interior foam plastics insulation

Kolich

Hoke

Dooge

et al. 2012

Journal of Elastomers & Plastics

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“…Probes operating as linear heat sources are typically used for measurements of the thermal conductivity of loose materials and viscous fluids [4][5][6][7][8][9][10][11]. A thermal probe is at the same time a heater (a linear heat source) and a thermometer that measures the temperature of a sample at a certain distance from the installed heater or the heater temperature itself.…”

Section: Thermal Probe Methodsmentioning

confidence: 99%

“…Summing up, we can state that known thermal probe techniques for evaluation of the thermal conductivity use simplified the relationships derived on the basis of the Fourier equation [4][5][6][7][8][9][10][11]. These techniques do not ensure accurate results.…”

Section: Thermal Probe Methodsmentioning

confidence: 99%

“…1). Probes operating as linear heat sources are used usually for measurements of the thermal conductivity of loose materials and viscous fluids [4,5,8,9,12,14]. In the case of such heat insulating materials like mineral wool or foamed polystyrene, more than 90% of their porous structure is filled with gas, which makes it possible to plunge a thin needle shaped probe without damage.…”

Section: A New Idea Of a Hot Probe Measurement Systemmentioning

confidence: 99%

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An Idea of a Measurement System for Determining Thermal Parameters of Heat Insulation Materials

Chudzik¹,

Minkina²

2011

Metrology and Measurement Systems

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The article presents the prototype of a measurement system with a hot probe, designed for testing thermal parameters of heat insulation materials. The idea is to determine parameters of thermal insulation materials using a hot probe with an auxiliary thermometer and a trained artificial neural network. The network is trained on data extracted from a nonstationary two-dimensional model of heat conduction inside a sample of material with the hot probe and the auxiliary thermometer. The significant heat capacity of the probe handle is taken into account in the model. The finite element method (FEM) is applied to solve the system of partial differential equations describing the model. An artificial neural network (ANN) is used to estimate coefficients of the inverse heat conduction problem for a solid. The network determines values of the effective thermal conductivity and effective thermal diffusivity on the basis of temperature responses of the hot probe and the auxiliary thermometer. All calculations, like FEM, training and testing processes, were conducted in the MATLAB environment. Experimental results are also presented. The proposed measurement system for parameter testing is suitable for temporary measurements in a building site or factory.

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“…The λ g contribution, which is equal to the product between the thermal conductivity of the gas (CO 2 for our foams) and volumetric fraction of the gas foam, changes with relative density (ρ*/ρ s , where ρ* is the foam density and ρ s is the density of the not expanded polymer [42]) of the foam and of course to the closed cell percentage. Finally, the radiation factor [42][43][44][45], λ r [46], depends on the cell dimensions, the wall thickness (for instance foams with a high number of cells with small size dimensions transfer less heat by radiation than foams with a few big cells), along with the higher closed cell amount. For these reasons, in our case the closed cells structure and the reduction of foam density (ρ*) can be responsible of the reduction of the terms λ g , λ s and λ r , and consequently of λ i .…”

Section: Sustainability Index Of the Developed Foamsmentioning

confidence: 99%

Upgrading Sustainable Polyurethane Foam Based on Greener Polyols: Succinic-Based Polyol and Mannich-Based Polyol

et al. 2020

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It is well known that the traditional synthetic polymers, such as Polyurethane foams, require raw materials that are not fully sustainable and are based on oil-feedstocks. For this reason, renewable resources such as biomass, polysaccharides and proteins are still recognized as one of the most promising approaches for substituting oil-based raw materials (mainly polyols). However, polyurethanes from renewable sources exhibit poor physical and functional performances. For this reason, the best technological solution is the production of polyurethane materials obtained through a partial replacement of the oil-based polyurethane precursors. This approach enables a good balance between the need to improve the sustainability of the polymer and the need to achieve suitable performances, to fulfill the technological requirements for specific applications. In this paper, a succinic-based polyol sample (obtained from biomass source) was synthesized, characterized and blended with cardanol-based polyol (Mannich-based polyol) to produce sustainable rigid polyurethane foams in which the oil-based polyol is totally replaced. A suitable amount of catalysts and surfactant, water as blowing reagent and poly-methylene diphenyl di-isocyanate as isocyanate source were used for the polyurethane synthesis. The resulting foams were characterized by means of infrared spectroscopy (FTIR) to control the cross-linking reactions, scanning electron microscopy (SEM) to evaluate the morphological structure and thermal gravimetric analysis (TGA) and thermal conductivity to evaluate thermal degradation behavior and thermal insulation properties.

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Measurement of thermophysical properties of polyurethane foam insulation during transient heating

Cited by 22 publications

References 0 publications

Influence of temperature and mechanical compression on thermophysical properties of car interior foam plastics insulation

Influence of temperature and mechanical compression on thermophysical properties of car interior foam plastics insulation

An Idea of a Measurement System for Determining Thermal Parameters of Heat Insulation Materials

Upgrading Sustainable Polyurethane Foam Based on Greener Polyols: Succinic-Based Polyol and Mannich-Based Polyol

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