1. Ogrevanje in hlajenje z uporabo toplotne črpalke in sonca v bolnišnici Murska Sobota : diplomska naloga visokošolskega strokovnega študijskega programaPeter Brenčič, 2008, undergraduate thesis Keywords: toplotna črpalka, ogrevanje, hlajenje, fotonapetostni sistem, eng, electric power generation, heating, cooling, photovoltaic system
Published: 09.01.2009; Views: 2566; Downloads: 495
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2. Vloga in nastanek mikrostrukturnih sestavin M-A v zvarnih spojih maloogljičnih visokotrdnostnih konstrukcijskih jekelZdravko Praunseis, Masao Toyoda, Alojz Križman, Mitsuru Ohata, 2001, review article Abstract: The existence of martensite-austenite constituents in the weld metal and heat-affected zone seriously reduces the fracture toughness of the welded joint. Therefore, we have investigated the formation of the martensite-austenite constituents when high-strength low-alloy steel is welded with a high heat input or using multi-pass welding. This paper deals with the effects of martensite-austenite constituents on the fracture toughness, the metallurgical features of the martensite-austenite constituents, and the prevention and elimination of the martensite-austenite constituents in the welded joints.
Keywords: arc welding, high-strength low-alloy steels, microstructure, martensite-austenite constituents, weld metal, heat-affected zone, cooling rate
Published: 01.06.2012; Views: 1148; Downloads: 61
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3. Heat diffusion in fractal geometry cooling surfaceMatjaž Ramšak, Leopold Škerget, 2012, original scientific article Abstract: In the paper the numerical simulation of heat diffusion in the fractal geometry of och snowflake is presented using multidomain mixed Boundary Element Method. he idea and motivation of work is to improve the cooling of small electronic devices sing fractal geometry of surface similar to cooling ribs. The heat diffusion is ssumed as the only principle of heat transfer. The results are compared to the heat lux of a flat surface. The limiting case of infinite small fractal element is computed sing Richardson extrapolation.
Keywords: heat transfer, cooling of electronic devices, boundary element method, fractals
Published: 10.07.2015; Views: 649; Downloads: 181
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4. Energy saving cooling-unit for plastic moulding machineDarko Lovrec, Vito Tič, 2011, original scientific article Abstract: Compressed air is one of the major sources of energy consumption and also one of the most expensive types of energy. Consequently, special attention must be paid to its rational use. This is especially important in cases where compressed air is blowed into an "empty" space. All cleaning and cooling processes using compressed air are typical examples of such applications. They are the most wasteful consumers of compressed air. Measures to minimize air consumption in such cases are presented in the paper. The highly efficient cooling unit for plastic moulding machines has been designed and optimized based on CFD simulation, and then produced using RP/RM (Rapid Prototyping / Manufacturing) manufacturing technology. The developed and specially designed nozzle-system was used for cooling purposes during plastic canister manufacturing. The previously-used conventional cooling system had so far been recognized as the most wasteful compressed air consumer in the company. The newly-designed air-efficient cooling unit, with increased capacity for cooling air, allows for up to 50% energy savings regarding compressed air.
Keywords: compressed air, cooling, blow moulding machine
Published: 10.07.2015; Views: 466; Downloads: 71
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5. The influence of cooling rate on the microstructure of an Al-Mn-Be alloyNiko Rozman, Tonica Bončina, Ivan Anžel, Franc Zupanič, 2008, original scientific article Abstract: In ternary Al-Mn-Be alloys a metastable quasicrystalline phase can form at relatively low cooling rates (≈ 100 K/s); however, besides the quasicrystalline phase other phases can also be present. We found that the investigated alloy is very prone to the formation of metastable phases, which are also quasicrystalline. Using different investigation methods we determined the type of phases, their shape, morphology, chemical composition and distribution. Special attention was given to the micro- and nano-sized quasicrystalline particles. When using slow cooling, Al10Mn3 and Be4AlMn were present; however, with a faster cooling rate a quasicrystal approximant and a quasicrystalline phase were formed.
Keywords: aluminium, quasicrystals, cooling rate, microstructure
Published: 10.07.2015; Views: 570; Downloads: 30
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8. Effect of cooling rate on the microstructure of an Al94Mn2Be2Cu2 alloyTonica Bončina, Boštjan Markoli, Franc Zupanič, 2012, original scientific article Abstract: In this study the effect of the cooling rate on the microstructure of Al94 Mn2 Be2 Cu2 alloy was investigated. The vacuum induction melted and cast alloy was exposed to different cooling rates. The slowest cooling rate was achieved by the DSC (10 K·min^−1), the moderate cooling rate succeeded by casting in the copper mould (≈1 000 K·s−1) and the rapid solidification was performed by melt spinning (up to 10^6 K·s^−1). The microstructure of the DSC-sample consisted of α-Al matrix, and several intermetallics: τ1-Al29 Mn6 Cu4 , Al4 Mn, θ-Al2 Cu and Be4 Al(Mn,Cu). The microstructures of the alloy at moderate and rapid cooling consisted of the α-Al matrix, i-phase and θ-Al2 Cu. Particles of i-phase and θ-Al2 Cu were much smaller and more uniformly distributed in melt-spun ribbons.
Keywords: Al-alloy, metallography, microstructure, cooling rate, solidification
Published: 03.07.2017; Views: 235; Downloads: 48
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10. The microstructure and properties of materials at the fusion lineVladimir Gliha, 2005, original scientific article Abstract: In this paper, the formation of the HAZ that is caused by the thermal effects of welding is investigated from the theoretical and experimental points of view. Samples of the material found at the fusion line were prepared by simulating the thermal regimes that occur during welding. A number of CCT diagrams that are valid for the conditions during welding were designed, and the hardness and impact-toughness of the samples were measured. This information was then related to the results of metallographic examinations. The maximum temperature and the cooling rate of the applied thermal cycles were found to be decisive in terms of the properties of HAZ.
Keywords: welding, HAZ, thermal cycle, cooling rate, fusion line
Published: 03.07.2017; Views: 1214; Downloads: 65
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