20.500.12556/RUL-171827 Vpliv omočljivosti bakrenih površin na odlaganje vodnega kamna pri enofaznem prenosu toplote Influence of copper surface wettability on scale deposition during single phase heat transfer Trda voda povzroča nalaganje oblog vodnega kamna, kar vodi do zmanjšanje energetske učinkovitosti in krajše življenjske dobe toplotnih sistemov. V nalogi so opisani fizikalno-kemijski mehanizmi kristalizacije kalcijevega karbonata ter vpliv površinskih lastnosti na nastanek oblog. Sestavljena je bila eksperimentalna proga s štirimi segmenti bakrenih cevi, s katero so bili izvedeni testi nalaganja oblog pri uporabi pitne vode s povišano trdoto. Spremljani so bili parametri: temperatura hladne vode v okolici segmenta cevi, temperatura vroče vode na vstopu in izstopu segmenta ter električna prevodnost, pH in trdota hladne vode ter pretoka na obeh zankah vroče in hladne vode. Primerjani so bili štirje tipi cevi: brušene bakrene cevi, črno jedkane, črno jedkane s hidrofobizacijo ter brušene cevi z vgrajenim GENESIS filtrom, ki je služil kot element za zmanjševanje trdote vode. Rezultati so pokazali, da površinska obdelava in filtracija bistveno vplivata na hitrost nalaganja oblog in učinkovitost prenosa toplote. Modifikacija hrapavosti in omočljivosti površin pri tem predstavljata pasivni način, s katerim lahko vplivamo na pojav kristalizacijskega mašenja v toplotnih sistemih. Hard water causes the accumulation of scale depostits, leading to reduced energy efficiency and a shorter service life of heating systems, This study describes the physico-chemical mechanisms of calcium carbonate crystallization and the influence of surface properties on scale formation. An experimental setup was assembled with four segments of copper pipes to conduct scale deposition testes using drinking water with elevated hardness. The monitored parameters included: cold-water temperature around the pipe segment, hot-water temperature at the segment's inlet and outlet, as well as the electrical conductivity, pH and hardness of the cold water, and the flow rates in both the hot- and cold- water loops. Four types of pipes were compared: polished copper pipes, black-etched copper pipes, black-etched with hydrophobization and polished pipes with an integrated GENESIS filter, serving as an element for reducing water hardness. The results show that surface treatment and filtration significantly influence the rate of deposit accumulation and heat-tranfer efficiency. Modification of surface roughness and wettability represent a passive approach to mitigating crystallization fouling in heating systems. omočljivost površin bakrene površine vodni kamen enofazni prenos toplote hidrofobnost hidrofilnost površinska obdelava surface wettability copper surfaces limescale single-phase heat transfer hydrophobicity hydrophilicity surface treatment true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-09-03 08:30:30 2025-09-03 08:30:33 2025-09-22 03:40:19 0000-00-00 00:00:00 2025 0 0 XXII, 74 str. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 536.2:621.7.015(043.2) 275200 248428035 43415.pdf 43415.pdf 1 57C454FA4B0776DF0BF14C484DCFAD7B b2733fb3657f4ef25829932746f46d262dc9168c269d50c67a9d4bd2ef788e2a 59c9e083-888f-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=215317 Fakulteta za strojništvo 0 0 0