Semi-Empirical Method for Measuring Thermal Conductivity of Fibrous Insulation Materials

2019 ◽  
Author(s):  
Christopher Barrow ◽  
John F. Maddox ◽  
Alexandre Martin
Keyword(s):  
Thermal Conductivity ◽  
Empirical Method ◽  
Insulation Materials ◽  
Fibrous Insulation ◽  
Semi Empirical

scholarly journals Thermo-Insulation Properties Of Hemp-Based Products

2015 ◽  
Vol 52 (1) ◽  
pp. 38-51 ◽  
Author(s):  
V. Lekavicius ◽  
P. Shipkovs ◽  
S. Ivanovs ◽  
A. Rucins
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
New Products ◽  
Environmental Safety ◽  
Insulation Materials ◽  
Fibrous Insulation

Abstract As known, many multi-purpose plants can be used in different industries. This research is focused on the possibilities to utilize hemp as feedstock for thermal insulation products. The most advantageous features of hemp insulation are associated with health and environmental safety. The thermal conductivity of commercially available hemp insulation products is comparable with that of other fibrous insulation materials; however, it is possible to develop new products that could be more efficient in terms of cost and due to other important features.

Evaluation of Thermal Properties of Fibre Insulation Materials for Inflatable Mini Cold Storage

2013 ◽  
Vol 803 ◽  
pp. 213-217 ◽  
Author(s):  
Yan Wu ◽  
Jiu Chun Han ◽  
Xi Hong Li ◽  
Zhi Li
Keyword(s):  
Thermal Conductivity ◽  
Cold Storage ◽  
Loss Rate ◽  
Radiation Heat Transfer ◽  
Far Infrared ◽  
Decomposition Temperature ◽  
Initial Decomposition Temperature ◽  
Insulation Materials ◽  
Fibrous Insulation ◽  
Heat Preservation

Fibre materials, as thermal insulation materials, will be an optimum choice for inflatable mini cold storage. The evaluation index such as infrared spectrum, thermal stability and thermal conductivity is closely related to the selection and application of fibrous insulation materials. The results showed that the transmittance of bamboo fibre tested by Fourier Transform Infrared Spectroscopy (FTIR) measurements was about 35.3% with an advantage to the heat preservation, and radiation heat transfer was analyzed in the area of far-infrared. The initial decomposition temperature of 1#, 2# and 3# measured by TGA curve was respectively 383.9°C, 372.5°Cand 315.4°C, and the total thermal weight loss rate of 1#, 2# and 3# was 64.59%, 90.16% and 80.47%. The thermal conductivity of 1# at 0°C was 0.035 W·m-1·K-1, lower than 2# and 3#, also lower in the temperature range from 0°C to 8°C, measured by hypothermia thermal instrument.

Effect of Nano-Cluster Compactness on Thermal Physical Properties of Nanofluids

2011 ◽  
Author(s):  
Zhaozan Feng ◽  
Wei Li ◽  
Tingting Wu
Keyword(s):  
Thermal Conductivity ◽  
Critical Analysis ◽  
Water Solution ◽  
Thermal Conductance ◽  
Empirical Method ◽  
Trade Off ◽  
Cluster Compactness ◽  
Nano Cluster ◽  
Semi Empirical ◽  
Thermal Physical Properties

This paper reports an experimental work on the viscosities of 30% (in volume) ethylene glycol water solution based nanofluids, and presents a critical analysis of the experimental reports on thermal conductivity and dynamic viscosity in terms of the mechanism of aggregation and show that, by manipulating the morphology of the aggregates, the first-best trade-off between the thermal conductance and rheological behavior of general nanofluids can be approximately achieved. Attempt to regulate the viscosity of nanosized SiO2 suspensions was made following a semi-empirical method named particle grading.

Modeling the Effects of O-sulfonation on the CID of Serine

2020 ◽  
Author(s):  
Kenneth Lucas ◽  
George Barnes
Keyword(s):  
Sulfo Group ◽  
High Energy ◽  
Empirical Method ◽  
Side Chain ◽  
Energy Structure ◽  
Direct Dynamics ◽  
Theoretical Mass ◽  
Intermolecular Proton Transfer ◽  
Dynamics Simulations ◽  
Semi Empirical

We present the results of direct dynamics simulations and DFT calculations aimed at elucidating the effect of \textit{O}-sulfonation on the collision induced dissociation for serine. Towards this end, direct dynamics simulations of both serine and sulfoserine were performed at multiple collision energies and theoretical mass spectra obtained. Comparisons to experimental results are favorable for both systems. Peaks related to the sulfo group are identified and the reaction dynamics explored. In particular, three significant peaks (m\z 106, 88, and 81) seen in the theoretical mass spectrum directly related to the sulfo group are analyzed as well as major peaks shared by both systems. Our analysis shows that the m\z 106 peaks result from intramolecular rearrangements, intermolecular proton transfer among complexes composed of initial fragmentation products, and at high energy side-chain fragmentation. The \mz 88 peak was found to contain multiple constitutional isomers, including a previously unconsidered, low energy structure. It was also seen that the RM1 semi empirical method was not able to obtain all of the major peaks seen in experiment for sulfoserine. In contrast, PM6 did obtain all major experimental peaks.

Theoretical investigation of Ramachandran plot of N-formyl-L-alanine-amide

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Genetic Algorithm ◽  
Theoretical Investigation ◽  
Energy Analysis ◽  
Empirical Method ◽  
Conformational Space ◽  
Ramachandran Plot ◽  
Global Minima ◽  
Reasonable Time ◽  
Semi Empirical

The full conformational space of N-formyl-L-alanine-amide was explored by the semi-empirical method AM1 coupled to the Multi Niche Crowding (MNC) genetic algorithm implemented in a package of programs developed in our laboratory. The structural and energy analysis of the resulting conformational space E(,ψ) exhibits 5 regions or minima ɣL, ɣD, ɛL, D and αD. The technique provides better detection of local and global minima within a reasonable time.

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