Energy efficient convection systems can be designed by reducing irreversibilities.
Rhombic enclosures with differential and Rayleigh–Benard heating situations are chosen.
Heat transfer (rc">rmulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0997754615000709&_mathId=si2.gif&_user=111111111&_pii=S0997754615000709&_rdoc=1&_issn=09977546&md5=3e1dd15f6631690bff5a222e012cc335" title="Click to view the MathML source">S胃r hidden">) and fluid friction irreversibilities (rc">rmulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0997754615000709&_mathId=si3.gif&_user=111111111&_pii=S0997754615000709&_rdoc=1&_issn=09977546&md5=2400d3f5f3862180ed132b9a28d61bdf" title="Click to view the MathML source">S蠄r hidden">) have been reported.
Heating patterns and geometrical orientations have been analyzed based on entropy generation.
Appropriate rhombic angles (rc">rmulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0997754615000709&_mathId=si1.gif&_user=111111111&_pii=S0997754615000709&_rdoc=1&_issn=09977546&md5=cf1b139ac8d733e5c416eda8e47d593b" title="Click to view the MathML source">蠁r hidden">) have been proposed based on irreversibility analysis.