Precise temperature controlling algorithm for metrological adiabatic calorimeters based on proportional-integration (α) thermal energy

Matarawy, A. El; El-Dien, Eman Mohy

doi:10.1007/s10973-021-10806-2

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…Our mission is to maintain, disseminate and develop the unit of thermodynamic temperature that was defined by the Boltzmann constant in the advanced research branch and the approximated thermodynamic temperature that was realized by the International Temperature Scale 1990 (ITS-90). Furthermore, there are another mission for ThML is to introduce the industrial routine calibration, thermal exposure, viscosity, humidity, thermal conductivity, and more services that are traceable to ITS-90 [1][2][3][4][5][6][7][8]. Thermal conductivity is a physical quantity that must be taken into consideration when evaluating building materials, as it is one of the most important requirements, especially in extreme areas in high or low temperatures in a thermal climate.…”

Section: Introductionmentioning

confidence: 99%

Determination of Al2O3 Powder Thermal Conductivity Using DSC at NIS-Egypt

Abd-ElGaliel

El-Matarawy

El-Dien

2022

ARFMTS

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The mission of the thermal metrology laboratory is to maintain, disseminate, develop and realize the International Temperature Scale 1990 (ITS-90). One of the services that the laboratory has introduced is the routine calibration to all industrial sectors that covers almost all fields inside and outside Egypt. This paper explains how to use Differential Scanning Calorimeter (DSC) to determine the thermal conductivity of unknown powders. The paper is based on the ability to determine the thermal conductivity (k) of powders from the melting peak of the reference metal. This technique assists for the first time to establish a new activity at the National Institute for Standardization to test the thermal conductivity of powders, which had been requested by many clients. Experiments were carried out using alumina powder Al2O3 and metal reference beads of Sn and Zn which have diameter ranges from 1.9 mm up to 4.12 mm in an atmosphere of nitrogen during Sn and Zn melting. The results show good performance. The results showed confidence that will enable to do more studies at NIS to see if this technology can be applied to a wider spectrum of materials.

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Section: Introductionmentioning

confidence: 99%

Determination of Al2O3 Powder Thermal Conductivity Using DSC at NIS-Egypt

Abd-ElGaliel

El-Matarawy

El-Dien

2022

ARFMTS

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Thermophysical Parameters of a Semi-Finished Watermelon Product as an Object of Dehumidification

Nugmanov

Meshcheryakova

Лебедев³

et al. 2022

Food Processing: Techniques and Technology

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Introduction. Pectin-based protective coatings can produce a perfect biodegradable edible film. Secondary watermelon raw materials are a promising resource for this type of food coating as it contains 13.4% of pectin components, of which 8.1% is protopectin. The present research objective was to find the density and thermophysical characteristics of the pectin extract in order to optimize the drying process. Study objects and methods. The research featured a pectin extract from watermelon rind. Its thermophysical properties were defined according to the thermocouple inertia method. The calorimetric method was used to change the aggregation state, while the pycnometric method was applied to calculate the density. The method of criterion equations helped to define the heat transfer coefficient. Results and discussion. The average density of the final film material was 652 kg/m3 and that of the liquid semi-finished product was 1,028 kg/m3. The research also revealed the dependence of physical density and humidity W, heat capacity, thermal diffusivity, and thermal conductivity. For different W, averaged were 3393, 3225, 3137, and 3113, respectively. The study also provided the criterion dependence for determining the heat transfer coefficient and modified α on the speed of the air coolant for artificial convection at conventional coolant temperature (≈ 100°C) in contact with the food product surface (≈ 80°C). Conclusion. The article introduces the thermophysical characteristics and physical density of watermelon gel for various humidity and thermal agent parameters, as well as a modified criterion dependence for determining the heat transfer coefficient. The research results can be used to design dehydration operations, other thermophysical processes, and their equipment.

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Precise temperature controlling algorithm for metrological adiabatic calorimeters based on proportional-integration (α) thermal energy

Cited by 2 publications

References 18 publications

Determination of Al2O3 Powder Thermal Conductivity Using DSC at NIS-Egypt

Determination of Al2O3 Powder Thermal Conductivity Using DSC at NIS-Egypt

Thermophysical Parameters of a Semi-Finished Watermelon Product as an Object of Dehumidification

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