How to choose a better envelope design? A balance between energy and daylighting performance

Peng Xue, Jingchao Xie, Jiaping Liu, Cheuk Ming Mak

Research output: Journal article publicationConference articleAcademic researchpeer-review

6 Citations (Scopus)


Published by Elsevier Ltd. Daylight has two characteristics: radiometry and photometry. Hong Kong is situated just south of the Tropic of Cancer and receives a lot of daylight which could generate more lighting energy savings but bring solar heat gain at the same time. This study appealed that the energy-efficient design should guarantee residents' luminous comfort level first. A dynamic daylight metric, average DA300(Daylight Autonomy), was first tested to quantify occupants' luminous comfort by using statistical analysis with the data from questionnaire survey and climate-based simulation of 108 unit cases. The benchmark of Ave. DA300is then found as 29.6 %. A new parameter EDR (Energy Daylight Rate) was also proposed to reflect the relation between daylighting performance and energy performance. Case study was conducted to optimize the green features' design and validate the utilization of EDR. The result showed the EDR could help optimize the envelope design at the early stage.
Original languageEnglish
Pages (from-to)1027-1033
Number of pages7
JournalProcedia Engineering
Publication statusPublished - 1 Jan 2017
Event10th International Symposium on Heating, Ventilation and Air Conditioning, ISHVAC 2017 - Jinan, China
Duration: 19 Oct 201722 Oct 2017


  • Daylight autonomy
  • Energy-saving
  • Luminous comfort
  • Statistical analysis
  • Uniformity

ASJC Scopus subject areas

  • General Engineering


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