A highly efficient cascade electrocaloric cooling tube with enhanced temperature change by sawtooth voltage

Electrocaloric (EC) cooling technology has emerged as a powerful candidate for the next-generation cooler. Microfluidic  EC cooling device could directly be embedded inside microelectronics to  build up a highly efficient thermal management system. However, the  microfluidic EC cooling device with large temperature lift still remains  a big challenge. Here, we prepared a high-performance cascade EC  cooling tube with multistage  cooling accumulation and improved its cooling power by sawtooth  voltage. The cascade EC tube realized a maximum temperature drop of  4.6 K. A maximum temperature span of 4.2 K was obtained when the flow  velocity of liquid medium is 10 mm/s. A continuous sub-ambient liquid  medium with improved cooling power can be achieved after the cascade EC  tube cycle loading with sawtooth voltage. This high-performance cascade  EC tube provides a sub-ambient liquid medium, opening up a unique way to  enhance the cooling power and realize multistage cooling accumulation.  It demonstrates the great application potential in smart thermal  management of microelectronic systems.