raw · papers · ingested 2026-06-28
Efficiency of caloric materials vs vapor compression (exergetic grades)
Source: https://iopscience.iop.org/article/10.1088/2515-7655/ace7f4
Source: J. Phys. Energy 5:045002, 2023 (Schipper et al.). Credibility: High (peer-reviewed). Confidence: high.
Key points
- Max theoretical exergetic efficiency (active-regenerator config): magnetocaloric ~100%, barocaloric 96%, electrocaloric 93%, elastocaloric 82% — all above vapor compression’s <80% even with a 100%-isentropic compressor.
- So magneto- and barocaloric could in principle surpass an ideal vapor-compression system.
- The gap: the best experimentally realized caloric system reaches only ~60% exergetic efficiency; real vapor-compression systems achieve ~50% (compressor isentropic 40-80%).
Relevance
The honest efficiency framing for solid-state-cooling: caloric is theoretically superior but practically not there yet — the deal is implementation (regenerators, hysteresis, power density), not thermodynamic ceiling.