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Study on Winter Comfort Temperature in Mixed Mode and HVAC Office Buildings in Japan

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Title: Study on Winter Comfort Temperature in Mixed Mode and HVAC Office Buildings in Japan
Authors: Khadka, Supriya Browse this author
Rijal, Hom B. Browse this author
Amano, Katsunori Browse this author
Saito, Teruyuki Browse this author
Imagawa, Hikaru Browse this author
Uno, Tomoko Browse this author
Genjo, Kahori Browse this author
Takata, Hiroshi Browse this author
Tsuzuki, Kazuyo Browse this author
Nakaya, Takashi Browse this author
Nishina, Daisaku Browse this author
Hasegawa, Kenichi Browse this author
Mori, Taro Browse this author →KAKEN DB
Keywords: field survey
office buildings
mixed mode
HVAC
thermal sensation vote
indoor air temperature
Griffiths' method
comfort temperature
Issue Date: 6-Oct-2022
Publisher: MDPI
Journal Title: Energies
Volume: 15
Issue: 19
Start Page: 7331
Publisher DOI: 10.3390/en15197331
Abstract: Comfort temperature is important to investigate because the chosen office indoor temperatures affect the energy used in a building, and a thermally comfortable environment makes the occupants be more productive. The effects of temperature on comfort are broadly recognized for thermal comfort. Japanese office buildings are well equipped with air-conditioning systems to improve the thermal comfort of the occupants. The main objectives of this research were to compare the winter comfort temperature in mixed mode (MM) and heating, ventilation and air-conditioning (HVAC) office buildings and to investigate the relationship between the comfort temperature and the indoor air temperature. This study measured the thermal environmental conditions of the office buildings and surveyed the thermal comfort of the occupants. The field survey was conducted during winter in seven office buildings located in the Aichi prefecture of Japan. In total, 4466 subjective votes were collected from 46 occupants. The result suggested that the occupants were found to be more satisfied with the thermal environment of MM buildings than that of HVAC office buildings. Overall, 95% of comfort temperatures were in the range 22-28 degrees C in MM and HVAC buildings, which were higher than the indoor temperature of 20 degrees C recommended by the Japanese government. The comfort temperature was highly correlated to the indoor air temperature of the MM buildings than to that of HVAC buildings. This indicated that the occupants were more adapted towards the given thermal environment of MM buildings.
Rights: © [2022] by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).
Type: article
URI: http://hdl.handle.net/2115/87080
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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