version ISSN 1815-5944
BORRAJO-PEREZ, Rubén; QUINTERO-CABRERA, Diego and GONZALEZ-BAYON, Juan José. A comparative exergetic analysis of compact heat exchangers. Ingeniería Mecánica [online]. 2011, vol.14, n.3, pp. 181-188. ISSN 1815-5944.
The heat exchangers are important devices in both industry and household applications. This work is about heat transfer enhancement in heat exchangers surface. Many heat transfer enhancement techniques can be applied and then a comparative tool is needed to evaluate its performance. Thermodynamics is one of these tools and the exergetic analysis can be applied to heat exchanger surfaces. The exergy destroyed because both of thermal exchange between bodies with different temperatures and destroyed by friction drag is calculated. These results are used to compare heat exchanger surfaces. Heat exchanger surfaces in smooth configuration and the same surfaces using vortex generator as enhancement technique were compared. Results show the relationship between generated entropy, transversal pitch and Reynolds number. The technique employed was very useful and the advantage of using vortex generator on heat exchanger surfaces was proved.
Keywords : vortex generators; compact heat exchanger; elliptical tubes; exergy.