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  • Design and experimental-based thermal characterization of heat exchangers made of wavy tubes [Elektronski vir]
    Poredoš, Primož, strojnik, 1986- ...
    The main objective of presented study was to study thermal characteristics of a classic concentric-tube and a multi-tube counter-flow heat exchanger (HE) that was used in a local ventilation device. ... Since the need for providing an acceptable level of working and living conditions dictates, among other demands, an appropriate air quality in buildings, our team designed a local ventilation device that used natural energy sources. The inner and outer tubes of the presented HE had a wavy surface, with the wave height of 3 mm. Each wave was oriented in the transversal direction, with respect to fluid flow. In order to determine the thermal characteristics, an experiment has been performed. With the Wilson-plot method the average convective heat-transfer coefficients on the inner (warm air) and outer (cold air) sides of the inner tube were separately determined. All experimentally obtained values were also compared with average convective heat-transfer coefficients for a smooth straight tube. The results reveal that the heat transfer coefficients on the inner and the outer side of the inner wavy tube of both types of HE are in most cases similar or even lower, compared to heat transfer coefficients in a smooth tube. However, the heat transfer rate in the case of wavy tubes was noticeably higher due to the increased heat-transfer surface area for both types of HE.
    Vir: Proceedings of the 28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, 29th June - 3rd July 2015, Pau, France [Elektronski vir] : ECOS 2015 (Datoteka 51120 (f. 1-10))
    Vrsta gradiva - prispevek na konferenci
    Leto - 2015
    Jezik - angleški
    COBISS.SI-ID - 14114331

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