%0 Journal Article
%T Analysis of Flow and Heat Transfer in a Flat Solar Collector with Rectangular and Cylindrical Geometry Using CFD
%A Marroqu¨ªn-De Jes¨²s ¨¢ngel
%A Olivares-Ram¨ªrez Juan Manuel
%A Jim¨¦nez-Sandoval Omar
%A Zamora-Antu£¿ano Marco Antonio
%J Ingenier¨ªa, investigaci¨®n y tecnolog¨ªa
%D 2013
%I Universidad Nacional Aut¨®noma de Mexico (UNAM)
%X The present investigation describes the construction and experimentation of two solar energy absorbersusing water as working fluid and its simulation in Computational Fluid Dynamics (CFD). For Absorber A with rectangular cross section and Absorber B with circular cross section, water temperature was calculated using solar radiation and ambient temperature measure- ments showing increases of up to 62.5¡ãC for both absorbers. The maximum thermosiphonic flow measurement in Absorber A was 70l/h and 79l/h in Absorber B. On this basis, finite element method and CFD were used to ana- lyze the difference between both flows, with 45, 50, 55, 60, 65 and 70 l/h as simulation values. With the simulation results the Reynolds numbers were determined, finding that the maximum flow (70 l/h) gives the largest Reyn- olds number variation: 25 ¡Ü Re ¡Ü 115 for Absorber A and 199 ¡Ü Re ¡Ü 235 for Absorber B. With a smaller variation in Absorber B, the flow at all ducts turns out to be more uniform, which results in more ducts transferring heat to the working fluid.
%K flowstructure
%K flatsolarcollectors
%K simulationcfd
%K heattransfer
%K solarradiation
%U http://www.ingenieria.unam.mx/~revistafi/ejemplares/V14N4/V14N4_art08.pdf