A study of cooling rate of the supercooled water inside of cylindrical capsules |
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| Authors: | Sergio Leal Braga Juan José Milón Guzmán Hugo Guillermo Jiménez Pacheco |
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| Affiliation: | 1. Refrigeration and Heating Laboratory, Pontifical Catholic University of Rio de Janeiro, Rua Marques de Sao Vicente 225, 22453-900 Rio de janeiro, PUC-Rio, Brazil;2. Technological Research Laboratory in Energy, San Pablo Catholic University, UCSP, Peru;1. Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;2. Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA;1. Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;2. Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA |
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| Abstract: | An experimental apparatus was developed to investigate the supercooling phenomenon of pure water inside cylindrical capsules used for cold storage process. The Phase Change Material (PCM) used was distilled water. The external coolant material was a water–alcohol mixture (50% vol.), controlled by a constant temperature bath (CTB) in four fixed values (?4 °C, ?6 °C, ?8 °C, and ?10 °C). Temperatures varying with time were measured inside and outside the capsule. Cylindrical capsules with internal diameter of 30 mm, 45 mm, and 80 mm, with 1.5 mm wall thickness were made in aluminum, bronze or acrylic materials. The Cooling Rate (CR) was investigated for different positions on the internal wall of the capsule, for different external coolant temperatures (Tc), different capsules diameters and different materials. The results showed that the cooling rate is a strong function of the angular position on the internal wall, the coolant temperature, the capsule material, and the capsule's diameter. |
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