Potential benefits and optimization of cool-coated office buildings: A case study in Chongqing, China

Chaoqun Zhuang, Yafeng Gao, Yingru Zhao, Ronnen Levinson, Per Heiselberg, Zhiqiang Wang, Rui Guo

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Increasing envelope facet albedos considerably reduces solar heat gain, thus yielding building cooling energy savings. Few studies have explored the potential benefits of utilizing cool coatings on building envelopes (“cool-coated buildings”) based on life-cycle cost analysis. A holistic approach integrating the field testing, building energy simulation, and a 20-year life-cycle-based optimization was developed to explore cool-coated building performance and the maximum net savings of optimal building envelope retrofit and design. Experimental results showed that applying cool coatings to a west wall of an office building in Chongqing, China reduced its exterior surface temperature by up to 9.3 °C in summer. Simulation results showed that in Chongqing, making the roof and walls cool could reduce annual HVAC electricity use by up to 11.9% in old buildings (with poorly insulated envelopes) and up to 5.9% in new buildings. Retrofitting old buildings with a cool roof provided the net savings per modified area with present values up to 42.8 CNY/m2; retrofitting a new building with a cool roof or cool walls was not cost-effective. Optimizing both envelope insulation and envelope albedo can achieve 5.6 times the net savings of optimizing the insulation only, and 1.6 times that of optimizing albedo only.
Original languageEnglish
Article number120373
JournalEnergy
Volume226
Issue number1 July 2021
Number of pages18
ISSN0360-5442
DOIs
Publication statusPublished - Jul 2021

Keywords

  • Cool roof
  • Cool wall
  • Life-cycle cost analysis
  • Optimization
  • Design
  • Retrofit

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