Abstract
The present research designs a mechanically pumped cooling loop system and conducts an experimental investigation on the dynamic heat transfer characteristics of the system. The effects of the start-up heat load and heat load variation on the dynamic characteristics of the system are analyzed. The results indicate that during the start-up period, as the heat load rises, the temperature overshoot and duration time of adjustment decrease, while the pressure oscillation amplitude increases. During the regular operation period, as the heat load increases, the temperature at the evaporator outlet gradually increases until it approaches the saturation temperature and then remains constant. The pressure evolution at the evaporator outlet can be divided into four stages: steady state, drastic oscillation, damped oscillation, and slight oscillation.
Highlights
The development of very large-scale integration (VLSI) contributes to the extensive attention given to thermal control technologies for equipment with a high power density, including data center servers, avionic devices, hybrid vehicles, microwave military systems, and high-energy laser diodes (Thome, 2006)
The study of the heat transfer characteristics of the mechanically pumped cooling loop (MPCL) system focuses on investigating the start-up characteristics and variablecondition characteristics
The temperature overshoot can be defined as the value of the instantaneous temperature rise at the evaporator outlet when the system transitions from a single phase to two phases
Summary
The development of very large-scale integration (VLSI) contributes to the extensive attention given to thermal control technologies for equipment with a high power density, including data center servers, avionic devices, hybrid vehicles, microwave military systems, and high-energy laser diodes (Thome, 2006). Zhang et al (2021) conducted an experimental study on temperature control of a mechanically pumped two-phase cooling loop for the active cooling of high-heat-flux microelectronic devices via microchannel boiling, in which the thermal control system is configured with the active disturbance rejection control. Meng et al (2020) reported an experimental study on the transient behaviors of the mechanically pumped two-phase loop with a novel accumulator, focusing on the temperature variation during start-up and heat sources load-on/off. The Setra pressure sensors are placed at the inlet and outlet of the evaporator to study the dynamic thermal response of the system All of these signals are acquired by an Agilent acquisition instrument and recorded on a PC. Environment, which is set to 95% hereafter comparing the heat dissipation of the fluid with the amount of heating many times
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