On the thermal performance of a micro parallel channels heat exchanger

摘要: This paper presents the experimental and theoretical analysis of a micro heat exchanger designed for waste recovery from high concentration photovoltaic (HCPV) system. A test bench was built to analyze thermal behavior targeted work in similar condition an existing HCPV panel. power heater encapsulated inside copper cartridge, covered by insulation, leading dissipated fluxes around 0.6 MW/m2, representative flux over solar cell within module. An infrared camera used non-intrusively measure temperature field external surface, while thermocouples were placed at contact between heater, water inlet outlet ports. In analysis, hybrid numerical-analytical treatment is implemented, combining numerical simulation through COMSOL Multiphysics finite elements code micro-heat exchanger, analytical solution lumped-differential formulation electrical offering substantial computational cost reduction. Such simulations three-dimensional conjugated transfer problem critically compared results, also permitted inspect adequacy correlation based on simplified prescribed model without conjugation effects. It has been concluded that modeling should be adopted future design optimization tasks.