Emerging Passive Cooling Technologies and Their Multidisciplinary Applications: An Integrative Review

Abstract

The persistent rise in temperature driven by the emission of greenhouse gases presents a pressing contemporary challenge, fostering innovative cooling techniques. Currently, passive cooling technologies have gained attention in various research fields for their effectiveness in combating heat accumulation. Compared to traditional active cooling methods, which rely on electricity or other energy sources, passive cooling significantly reduces energy consumption and electricity demand. These technologies have demonstrated the potential for temperature reductions of ~1°C–24°C, translating to substantial electricity savings of about 2–300 kWh/year. This paper uses an integrative review approach to highlight the fundamental principles and design strategies underlying passive cooling technologies, such as phase change materials, radiative cooling, and evaporative cooling. Special emphasis is placed on their potential implementation, from preserving biological materials to cooling buildings, electronics, and personal clothing. Passive cooling methods offer cost savings over time due to lower maintenance and operational costs and potentially simpler designs.