Due to growing cooling demands as well as emerging global warming and climate change issues, cooling systems should be more efficiently utilized. Boiling is an effective heat transfer mechanism, which has a critical role in many cooling systems. Surface modification is considered as the major approach for boiling heat transfer enhancement. In this study, we developed a microbial bio-coating surface modification technique for phase change cooling applications. Thermoacidophilic Sulfolobus solfataricus coating was implemented using a facile dip coating method on different metallic and non-metallic surfaces. Controlled by drying conditions, the coating exhibited rough and porous morphologies. When tested in a boiling heat transfer setup, bio-coated surfaces offered enhancements up to 76.3% in Critical Heat Flux (CHF). Next, a miniature evaporator was coated and tested for real-world air-conditioning applications, and coefficient of performance (COP) enhancements up to 11% clearly revealed the potential of bio-coated surfaces for energy saving purpose and reduction in greenhouse gasses. Furthermore, coated evaporators reduced the exergy destruction rate up to 8%. This study not only offers a new type of coating morphology, but the applicability of the proposed bio-coating is also proven in a miniature air conditioning system.

由于对制冷的需求不断增长，以及新出现的全球变暖和气候变化问题，应更有效地利用制冷系统。沸腾是一种有效的传热机制，在许多冷却系统中都起着至关重要的作用。表面改性被认为是提高沸腾传热的主要方法。在这项研究中，我们开发了一种用于相变冷却应用的微生物生物涂层表面改性技术。嗜热嗜酸硫杆菌使用简便的浸涂方法在不同的金属和非金属表面上进行涂层。通过干燥条件的控制，涂层表现出粗糙和多孔的形态。在沸腾传热装置中进行测试时，生物涂层表面的临界热通量（CHF）增强了76.3％。接下来，对微型蒸发器进行涂覆并在实际的空调应用中进行了测试，性能系数（COP）提升高达11％清楚地表明了生物涂层表面在节能和减少温室气体方面的潜力。此外，带涂层的蒸发器将火用破坏率降低了8％。这项研究不仅提供了新型的涂层形态，而且在微型空调系统中也证明了所提出的生物涂层的适用性。