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Impact of Ageing on Thermal Efficiency of Solar Thermal Collectors
2008Today it is common practice to calculate the performance of solar thermal systems or solar collectors based on the results of a thermal performance test carried out with a new solar collector. However, for an integral assessment of solar thermal collectors and systems, it is necessary to consider the change of performance with time due to degradation ...
Streicher, Elke +2 more
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1965 Sixth Electrical Insulation Conference, 1965
We shall be concerned primarily with thermal endurance of the types of materials defined in NEMA Pub. No. LI 1-1965(1). It is our purpose to briefly review the contribution of the Industrial Laminate Section (NEMA) to the present knowledge of thermal stability of laminated, thermosetting plastics, and to discuss a program to provide further knowledge ...
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We shall be concerned primarily with thermal endurance of the types of materials defined in NEMA Pub. No. LI 1-1965(1). It is our purpose to briefly review the contribution of the Industrial Laminate Section (NEMA) to the present knowledge of thermal stability of laminated, thermosetting plastics, and to discuss a program to provide further knowledge ...
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Thermal aging of polyvinyl chloride
CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005., 2005This paper reports on the study of the thermal aging of the polyvinyl chloride used in high voltage cables. This study shows that thermal aging changes the electrical properties of the material. We notice that the higher the aging temperature is, the more important is the rate of degradation of the insulator.
M. Nedjar, A. Beroual, M. Bournane
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Thermal ageing of peat bitumen
Fuel, 1990Abstract Peat bitumens, obtained by solvent extraction, have been subjected to thermal ageing using procedures developed for road binder materials. Observed changes in mass and chemical constitution during ageing are consistent with a process involving acid-alcohol condensation.
James J. Leahy +2 more
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Proceedings., Second International Conference on Properties and Applications of Dielectric Materials, 2003
The results of thermal endurance tests performed on models of EPR (ethylene-propylene rubber) cables are presented. The problems of selecting the properties related to aging and their endpoints are discussed. A method for obtaining an objective failure criterion for different properties and a unique thermal endurance graph are described.
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The results of thermal endurance tests performed on models of EPR (ethylene-propylene rubber) cables are presented. The problems of selecting the properties related to aging and their endpoints are discussed. A method for obtaining an objective failure criterion for different properties and a unique thermal endurance graph are described.
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Thermal stability of substitutional Ag in CdTe
Journal of Crystal Growth, 1996The thermal stability of substitutional Ag in CdTe was deduced from lattice location measurements at different temperatures. Substitutional Ag probe atoms were generated via transmutation doping from radioactive Cd isotopes. The lattice sites of Ag isotopes were determined by measuring the channeling effects of emitted conversion electrons.
Jahn, SG +6 more
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Ageing evaluation of thermal barrier coatings by thermal diffusivity
Infrared Physics & Technology, 2007Ceramic thermal barrier coatings (TBC) are widely applied for protecting from combustion gases hot path components of gas turbines for both aero- and land-based applications. In order to prevent the detachment of TBC, it would be essential to monitor their degrada- tion in terms of sintering kinetic.
PG Bison +4 more
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Thermal-ageing of paraloid acrylic protective polymers
Polymer, 2000Abstract The thermal-ageing of a series of commercial acrylic/methacrylic resins, homo- and copolymers which are extensively used as stone protectives, has been investigated under conditions of constant temperatures at 110, 135 and 150°C. Structural and molecular changes induced by the isothermal treatments in a forced-air circulation oven were ...
LAZZARI, Massimo, CHIANTORE, Oscar
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Ultra-Accelerated Thermal Ageing Tests
2001Isothermal testing of polymer ageing requires long-term exposure if realistic results are to be obtained, which means a time-consuming and hence expensive exercise, which may have to be repeated many times over many different conditions. Rates of ageing can be accelerated by increasing the temperature of tests or by using a more aggressive environment,
Alan M. Emsley +2 more
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Thermal Ageing of Filled Polymers
British Polymer Journal, 1986AbstractThe rate of thermal ageing has been found to decrease when a polymer is adsorbed onto a filler. The retardation of this glassy state relaxation has been found to be dependent on the type and amount of filler present. Comparison with values for the glass transition temperature and melt rheology parameters shows that the same factors are ...
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