Micro-channel heat exchangers consist of a number of plates, each containing fluid channels etched in the surface and diffusion bonded together to create a porous core of metal. The primary and secondary sides of the exchanger are formed by connecting the channels on alternating plates to the respective leader pipes. To analyze the thermal response of exchangers during operation, simulation software is used to create a network of numerical models representing the real-life thermal-hydraulics components. The Systems CFD approach uses one-dimensional empirical models for the fluid flow inside the channels and a three-dimensional model for the heat distribution inside the core. Spatial analysis of the geometry gives a connectivity stencil between the one- and three-dimensional models. This stencil implicitly links the equations of the models at matrix level in the numerical solver, with faster convergence in fewer iterations than when the models are coupled explicitly in different software applications. Results presented show the heat flux through an exchanger core and the fluid flow inside the channels.

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