*4.3. Efficiency*

All the active cooling strategies' efficiencies, in terms of maximum temperature (*Tmax*) efficiency, temperature increase (Δ*T*) efficiency, and uniformity efficiency, are summarized in Figure 10. *Tmax*, Δ*T*, and uniformity efficiency were calculated the same way as explained in Section 3.3. The *Tmax* efficiency for all active cooling strategies fluctuated between 14% and 20%. The best cooling system in terms of *Tmax* efficiency was the cooling scenario with four fans; in second place, the cooling scenario with jute achieved an efficiency of 18.7%. Furthermore, Δ*T* efficiency reached 44.45% with the four-fan cooling strategy and 33.06% with the wet jute strategy. Uniformity efficiency was accomplished exclusively in the wet jute strategy by 2.5%. Last but not the least, it is noteworthy that integrating wet jute with an active cooling strategy could contribute to improving the cooling efficiency in terms of *Tmax*, Δ*T*, and uniformity simultaneously.

**Figure 10.** Efficiency comparison for cooling strategies: (1) air cooling (two suction fans); (2) air cooling (suction and blow fans); (3) evaporative cooling with jute; (4) evaporative cooling with fully wet jute (Reprinted with permission from ref. [46]).
