Energy consumption modelling of a passive hybrid system for office buildings in different climates

Yi Zhang, Thilhara Tennakoon, Yin Hoi Chan, Ka Chung Chan, Sau Chung Fu, Chi Yan Tso, Kin Man Yu, Bao Ling Huang, Shu Huai Yao, Hui He Qiu, Christopher Y.H. Chao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


Thermochromic smart windows and radiative coolers are two passive cooling technologies, whose adoption as windows and roofs, respectively, is feasible for building energy-saving. However, to the authors' knowledge, the investigation of annual energy performance incorporating both techniques is scarce at the time of writing. Therefore, a passive hybrid system involving both technologies is proposed in this study. A perovskite thermochromic smart window and three different radiative coolers were chosen based on their superior performance. The energy performance of the passive hybrid system in a prototypical medium-sized office building was simulated using EnergyPlus and the results were rigorously analyzed. Both thermochromic smart window and radiative cooler could reduce total energy consumptions by up to 10.6% and 23.0%, respectively, regardless of building's year of completion, while the synergic system saved up to 32.0%. Among the chosen cities of various climates, thermochromic smart windows and radiative coolers perform better in cities where cooling demand dominates. The west- and east-facing thermochromic smart windows could mitigate more energy usage in contrast to the other orientations. If this passive hybrid system can be offered at a reasonable cost, the technology is likely to be a viable energy-efficient option for buildings.

Original languageEnglish
Article number121914
Publication statusPublished - 15 Jan 2022


  • Energy simulation
  • Green building
  • Passive cooling
  • Passive radiative cooler
  • Thermochromic smart window

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Modelling and Simulation
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Pollution
  • Energy(all)
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Management, Monitoring, Policy and Law
  • Electrical and Electronic Engineering


Dive into the research topics of 'Energy consumption modelling of a passive hybrid system for office buildings in different climates'. Together they form a unique fingerprint.

Cite this