Browsing by Keyword "Falling-film"
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Item Contact angle measurement for LiBr aqueous solutions on different surface materials used in absorption systems(2018-11) Martinez-Urrutia, Asier; Fernández de Arroiabe, Peru; Ramirez, Miguel; Martinez-Agirre, Manex; Mounir Bou-Ali, M.; Tecnalia Research & Innovation; SISTEMAS TÉRMICOS EFICIENTESWetting surface is a very important issue for the design of absorption applications and heat exchangers. The contact angle is deemed essential in wettability studies; However, LiBr aqueous solution contact angle studies are limited. This work analyses the contact angle of LiBr aqueous solution in the range of 0–55% mass fraction on different material surfaces: copper, aluminum, stainless-steel and polytetrafluoroethylene (PTFE) under atmospheric conditions. A sessile drop technique was used for measuring the contact angles, and a linear relation between solution surface tension and contact angle is observed in the tested materials. The study of three metals show hydrophilic performance (θ < 90°), whereas the PTFE shows hydrophobic performance. Additionally, the effect of the selection of the material, and consequent effect on the contact angle, on the minimum wetting rate and film thicknesses is presented under the working conditions of the absorption technologies. From the wettability point of view, the results show that using stainless-steel and aluminum leads to a slightly better performance than a copper made heat exchanger.Item Hybrid Liquid Desiccant System Design and Operation Under High Latent Load Conditions in Taiwan(2019-09) PEÑA, Xabier; ALONSO, Laura; DIAZ DE MENDIBIL, Andoni; PRIETO, Juan; GOMMED, Khaled; SISTEMAS TÉRMICOS EFICIENTESHybrid Liquid Desiccant systems (HLDS) combine the liquid desiccant technology for dehumidification of air with conventional compression cycle technology for cooling. They are an alternative to conventional compression cooling systems, being more efficient and offering the possibility of independently control temperature and humidity. In this paper the design and operation of a HLDS is presented, for the air conditioning of a high latent load application with high ambient humidity levels. An analysis of the daily evolution of the performance of the system under different environmental conditions has been included. The innovative demonstration unit placed in Taiwan, in continuous operation since November 2015, achieved Energy efficiency Ratios (EER) up to 4.6.