The researchers studied a new refrigeration system that uses low-grade heat to cool things down to -170°C. They found that when more low-grade heat is used, the system becomes more efficient, using less power and providing more cooling. Compared to a regular cooling system, this new one can be 38% more efficient. The researchers tested their model with real experiments and confirmed that it works well. This new system could be very useful for designing better cooling systems in the future.