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Effect of Charging and Discharging Process of PCM with Paraffin and Al2O3 Additive Subjected to Three Point Temperature Locations

Kumar Sunil K., Muniamuthu Sumathy, Mohan A., Amirthalingam P., Anbu Muthuraja M.

Journal of Ecological Engineering

2022

Vol. 23, nr 2

34--42

This analysis focused on investigating thermal storage behaviour on phase change material along with Al2O3 as an additive. The experimental investigation was performed by three set temperature points, i.e. 40 °C, 50 °C and 60 °C with the mass circulation rate through the tank of 5 kg/min, 3 kg/min and 2 kg/min. The forced circulation method was used to circulate the liquid, water was used as a working medium and Al2O3 as nano particle. Paraffin acts a phase change material to conduct the experimental procedure. The combination of paraffin with Al2O3 improves the latent heat storage of the material. The performance, with respect to charging and discharging of the material, was investigated and it was observed that the temperature location point of 50 °C shows the best results in terms of charging and discharging phenomena, compared to other two temperature location points. During the process of charging, the maximum rate of heat transfer can be achieved by Al2O3 nanofluids. Paraffin along with Al2O3 are characterized by the best thermal storage behaviour during the latent heat storage at charging process and dissipation of heat during discharge process. The rapid cooling comparison for three set location points has been studied and best solidification was achieved at the point of 60 °C; this is due to the rapid cooling at higher elevation temperatures. The energy that was stored in thermal form is to be transferred with the aid of heat exchanger, a special type heat exchanger employed in this analysis to transfer the heat. From this analysis it is concluded that paraffin with Al2O3 are characterized by the best performance in terms of the charging and discharging phenomenon.

Alternative PMB produced from recycling waste PMMA/ATH

Tusar M., Sustersic E., Zupancic-Valant A.

Transport Problems

2014

T. 9, z. 2

5--9

With development of production processes in refineries production of bitumen is decreasing, as well as the quality of produced bitumen. On the market this brings increased demand for bitumen accompanied by the demand for additives to improve such low quality bitumen. Many different types of additives are used, but most commonly SBS is added. Usage of additives bring additional direct costs, due to market price of additives and indirect cost due to adjustments in the technological process as such as additional mixing device in bitumen tanks, elevated temperature of asphalt or prolongation in mixing time. A topic of our research was development low price asphalt additive from waste poly-methyl methacrylate filled with a fine dispersion aluminium trihydrate (PMMA/ATH). Additionally with paraffin wax it was used as modifying agents for 70/100 paving grade bitumen. With regard to performance of modified asphalt mixtures, it was found that both additives considerably reduce moisture susceptibility and formation of ruts. With laboratory tests and field trial we found that combined technology PMA (polymer modified asphalt) and WMA (warm mix asphalt) technologies resulted in optimized production and excellent performance of pavement material.

Wraz z rozwojem procesu produkcyjnego w rafineriach zmniejszyła się produkcja bituminu, jak również jakość produkowanego bituminu. Niesie to ze sobą zwiększenie zapotrzebowania na bitumin, towarzyszy; temu popyt na dodatki uszlachetniające. Używanych jest wiele rodzajów dodatków, lecz najczęściej dodawanym jest SBS. Użycie dodatków powoduje dodatkowe koszty bezpośrednie - jest to spowodowane ceną rynkową dodatków - jak również koszty pośrednie, co jest spowodowane zmianami w procesie technologicznym, takimi jak dodatkowe urządzenia mieszające w kadziach bituminowych, wzrost temperatury asfaltu lub wydłużenie czasu mieszania. Tematem badań było osiągnięcie niskiej ceny dodatku asfaltu z odpadów polimetylowego metakrylanu wypełnionego dobrze zdyspersowanym trihydratem aluminium (PMMA/ATH). Dodatkowo użyto wosku parafinowego jako środka modyfikującego dla bituminowych płyt chodnikowych 70/100. W odniesieniu do wydajności zmodyfikowanych mieszanin asfaltowych stwierdzono, że oba dodatki znacznie zmniejszyły podatność na wilgoć i powstawanie kolein. Z badań laboratoryjnych i prób w terenie wynika, że połączenie technologii PMA (asfalt modyfikowany polimerowo) oraz WMA (ciepła mieszanka asfaltowa) zaowocowało technologiami zoptymalizowanymi w produkcji i doskonałą wydajnością materiału nawierzchni.