2020/01/16 by Thomas Gellrich, Clara Sester, Gellrich, Thomas +9
Engineering · #Heat Transfer and Optimization #Heat Transfer and Boiling Studies
paper · pdf · doi:10.48550/arxiv.2001.05793
For the thermal control of electronic components in aerospace, automotive or\nserver systems, the heat sink is often located far from the heat sources.\nTherefore, heat transport systems are necessary to cool the electronic\ncomponents effectively. Loop heat pipes (LHPs) are such heat transport systems,\nwhich use evaporation and condensation to reach a higher heat transfer\ncoefficient than with sole heat conduction. The operating temperature of the\nLHP governs the temperature of the electronic components, but depends on the\namount of dissipated heat and the temperature of the heat sink. For this\nreason, a control heater on the LHP provides the ability to control the\noperating temperature at a fixed setpoint temperature. For the model-based\ncontrol design of the control heater controller, the current LHP state-space\nmodel in the literature focuses on the setpoint response without modeling the\nfluid's dynamics. However, the fluid's dynamics determine the disturbance\nbehavior of the LHP. Therefore, the fluid's dynamics are incorporated into a\nnew LHP state-space model, which is not only able to simulate the LHP behavior\nunder disturbance changes, but is also used for the model-based design of a\nrobust nonlinear controller, which achieves an improved control performance\ncompared to the nonlinear controller based on the previous LHP state-space\nmodel.\n