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Improved superhydrophobic surface for new phase-change thermal diode in building thermal management

Author

Listed:
  • Zhao, Hengxin
  • Li, Shiying
  • Wu, Yifan
  • Sun, Hongli
  • Lin, Borong

Abstract

Compared with traditional dynamic building envelopes, the performance-adjustable building envelopes combined with the new phase-change thermal diode offer the advantages of excellent adjustability and straightforward control. To further enhance the unidirectional heat transfer capability and durability of the new phase-change thermal diode in building applications, this study employed chemical etching to fabricate a silver nitrate-based superhydrophobic surface with small structural spacing. The experimental results show that the application of a silver nitrate-based superhydrophobic surface effectively ensured the durability and stability of the new phase-change thermal diode. The maximum forward thermal conductivity was found to be 8.85 W/(m·K) and the thermal rectification reached 78.81. This represents an improvement of between 30.89 % and 249.53 % compared to the laser-fabricated superhydrophobic surface. Additionally, simulation demonstrated the energy-saving potential of dynamic building envelopes combined with the new phase-change thermal diode in data centers across different climate zones. The maximum annual energy savings reached 325.62 kWh/m2 were achieved, demonstrating significant application value. This study promotes the transition of performance-adjustable building envelopes from theoretical research to practical application, thereby fostering the dual development of the buildings and materials fields.

Suggested Citation

  • Zhao, Hengxin & Li, Shiying & Wu, Yifan & Sun, Hongli & Lin, Borong, 2026. "Improved superhydrophobic surface for new phase-change thermal diode in building thermal management," Energy, Elsevier, vol. 347(C).
    • Handle: RePEc:eee:energy:v:347:y:2026:i:c:s036054422600263x
    DOI: 10.1016/j.energy.2026.140161
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