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621.565+536.2:620.3 (1) |
Energie pneumatică, mașini și scule. Refrigerare (61) |
Conducerea căldurii. Transferul de căldură (40) |
Nanotehnologie (44) |
SM ISO690:2012 ХЛИЕВА, О., РЯБИКИН, С., ЖЕЛЕЗНЫЙ, Виталий, ГОРДЕЙЧУК, Татьяна. Экспериментальное исследование конвективного коэффициента теплоотдачи хладоносителя с добавками наночастиц Al2O3. In: Energetica Moldovei. Aspecte regionale de dezvoltare, Ed. Ediția III, 2016, 29 septembrie - 1 octombrie 2016, Chișinău. Chișinău, Republica Moldova: Institutul de Energetică al Academiei de Științe a Moldovei, 2016, Ediția III, pp. 391-399. ISBN 978-9975-4123-5-3. |
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Energetica Moldovei. Aspecte regionale de dezvoltare Ediția III, 2016 |
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Conferința "Energetica Moldovei" Ediția III, 2016, Chișinău, Moldova, 29 septembrie - 1 octombrie 2016 | ||||||
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CZU: 621.565+536.2:620.3 | ||||||
Pag. 391-399 | ||||||
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Such coolants as aqueous solutions of ethylene glycol or brines are widely used in chillers at present. Coolants that compose of aqueous solutions of propylene glycol have some advantages over mentioned above agents: non-toxicity, low corrosivity. However the aqueous solutions of propylene glycol, especially at low temperatures typical for refrigeration, have the large values of viscosity. Therefore, heat transfer efficiency in heat exchangers with this coolant is low and power consumption of circulation pump is significant. One of the methods to improve the thermophysical properties of the propylene glycol based coolant is additives the agent for the viscosity reducing and the metal or metal oxides nanoparticles as additives for thermal conductivity increasing. The prospects of nanoparticle additives to coolants for using in refrigeration systems have been considered in paper. The results of experimental investigation of the heat transfer coefficient at laminar flow forced convection of coolant and nanocoolant in pipe have been presented. The coolant composed of water /propylene glycol / agent to reduce the viscosity (48.60 / 46.52 / 4.88 mass %) and nanocoolant composed of water /propylene glycol / substance to reduce the viscosity / Al2O3 nanoparticles (48.24 / 46.38 / 4.85 / 0.53 mass %) have been used for experimental investigation. Experimental research is carried out on the original setup. It was shown that the heat transfer coefficients for various values of the Reynolds number that typical for laminar flow with using the traditional coolant was generally less, than with using the nanocoolant. |
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Cuvinte-cheie хладоноситель, ламинарный поток, наночастицы, коэффициент теплоотдачи, эксперимент |
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