摘要：AbstractThe thermal-fluid control of a microchannel evaporator operating in the two-phase regime is considered. The control objective is to stabilize the fluid flow and maintain a minimal evaporator wall temperature by commanding the inlet flow rate using a pump. The first objective is achieved with a feedback controller using only mass flow rate measurement (via a lead filter). The second objective is more challenging as the achievable wall temperature depends on the heat transfer coefficient which is hard to characterize (heavily depends on the flow rate and heat load). An extremum seeking control based on sliding modes is proposed to minimize wall temperature and adjust the flow rate without considering heat transfer coefficient knowledge. Thus, considering a thermal-fluid model, the stability of the flow control loop is establish and the convergence to the extremum seeking control is analyzed via singular perturbation analysis and Tikhonov’s theorem. Simulation results demonstrate the efficacy of the proposed scheme.
关键词：KeywordsThermal ManagementNonlinear SystemStabilizationExtremum seeking control
