ADVANCED CFD METHODOLOGY TO INVESTIGATE HIGH- TEMPERATURE COMPLEX WIRE NET MICRO HEAT EXCHANGER PERFORMANCE

International audienceThe objective of this paper is to predict micro heat exchanger performance for a micro Combined Heat and Power systems by a detailed modelling of complex microchannels and a new CFD methodology to assess the entire heat exchanger characteristics based on reduced order modelling. CFD methodology comprises of Conjugate Heat Transfer models and Reduced order models. This could reduce the computational size to a considerable large extent (billion cells to few million cells) with good accuracy. The porous medium model, based on Darcy-Forchheimer law is modified (Constant Integration Method) to account for the temperature evolution. They have been implemented and verified. The best-revised methodology allows obtaining pressure losses with less than three percent error with respect to the 3D CFD CHT modelling. Higher order turbulence models were used to investigate the influence of mesh on heat exchanger performance. A parametric study was conducted to study the influence of microchannel parameters on heat exchanger performance