Invited Talk: Dr. Kilian Bartholome presents "Long-term stable, compressiong-based elastocaloric cooling system with large cooling power density"

Environmentally friendly cooling systems are crucial for meeting the climate targets set by the Paris Agreement, making elastocaloric cooling systems an attractive alternative to compressor-based systems. One major obstacle to widespread application is the poor long-term stability of elastocaloric materials, particularly under tensile loads, despite their advantageous large surface area for heat transfer. Conversely, applying compressive loads improves material longevity but reduces cooling power density. In this work, we introduce an innovative heat transfer concept for elastocaloric cooling systems based on the evaporation and condensation of a fluid. For this concept, the necessity of thermal stabilitzation is derived and its realization in a working system is presented. This concept leads to a compression-based system characterized by exceptional long-term stability, exceeding 10^7 cycles, and yielding a significant cooling power density of up to 14 W g^-1.