Energy conservation between natural ventilated and airconditioned classroom in Taiwan

Meng Chieh Lee, Ling Tim Wong, Kwok Wai Mui, Chia Feng Chang, Wai Hou Lam

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


The energy consumption between natural ventilated classrooms (NVs) and air-conditioned classrooms (ACs) is different in hot and humid Taiwan. Energy conservation is related with the thermal comfort of occupants in these classrooms. This study proposed an electronic questionnaire and instruments to facilitate the continuous monitoring of the physical parameters to investigate the satisfied level of thermal comfort of students in classrooms. The investigated results show the average clothing value (clo) around 0.7. During the hot days (clo<0.7), students' acceptable range of temperature range in NVs was between 26.2°C -28.2°C (neutral temp.=27.3°C, neutral RH=59.9%) and 24.2°C-27.7°C (neutral temp.=26.3°C, neutral RH=57.2%) in ACs. During the cold days (clo≥0.7), students' acceptable range of temperature in NVs was between 20.9°C-25.1°C (neutral temp.=23.0°C, neutral RH=55.3%) and 22.0°C-25.4°C (neutral temp.=23.7°C, neutral RH=55.6%) in ACs. The maximum acceptable thermal temperature of students in NVs (27.3°C) is 1°C higher than that in ACs (26.3°C) and 1.3°C higher than the ASHRAE Standard 55 (26°C). The result implies that 6% energy can be saved between NVs and ACs and 7.8% energy can be saved compared with ASHRAE Standard 55. This study proposes the best solution of energy conservation between NVs and ACs.
Original languageEnglish
Title of host publicationIndoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate
PublisherInternational Society of Indoor Air Quality and Climate
Number of pages8
Publication statusPublished - 1 Jan 2014
Event13th International Conference on Indoor Air Quality and Climate, Indoor Air 2014 - Hong Kong, Hong Kong
Duration: 7 Jul 201412 Jul 2014


Conference13th International Conference on Indoor Air Quality and Climate, Indoor Air 2014
Country/TerritoryHong Kong
CityHong Kong


  • Air-conditioned classrooms
  • Clothing value
  • Energy conservation
  • Natural ventilated classrooms
  • Thermal comfort

ASJC Scopus subject areas

  • Pollution
  • Building and Construction
  • Health, Toxicology and Mutagenesis
  • Computer Science Applications

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