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The study of heat exchangers with both the hot and cold fluid sides driven bybuoyancy forces is an area of considerable interest due to their inherentpassivity and non-existence of moving parts. The current study aims to studysuch heat exchange devices employing the basic Coupled Natural Circulation Loop(CNCL) systems. A 1-D Fourier series based semi-analytical model of the basicCNCL system is proposed. A 3-D CFD validation is performed to validate thedeveloped 1-D model. The non-dimensional numbers such as Grashof number,Fourier number, Stanton number and Reynolds number, which determine the systembehavior are identified and a detailed parametric study is performed. Bothvertical and horizontal CNCL systems are considered along with the parallel andcounter flow configurations. The heater-cooler location greatly influences thebehavior of CNCL system. The vertical CNCL always exhibits counter flowconfiguration whereas the horizontal CNCL system may exhibit parallel orcounter flow arrangement depending on the heater-cooler location and initialflow conditions.

1-D semi-analytical modeling and parametric study of a single phase rectangular Coupled Natural Circulation Loop