Evaluation of environmental and physiological factors of a whole ceiling-type air conditioner using a salivary biomarker

Yusuke Tahara, Naomi Morito, Hajime Nishimiya, Hideyuki Yamagishi, Masaki Yamaguchi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In order to improve environmental condition such as humidity and airflow in living spaces, a whole ceiling-type air conditioner is proposed. This novel air conditioner exhaust dispersed airflow from the whole ceiling by using a 3-dimensional knit fabric. The purpose of this paper is to reveal the effects when controlling humidity and airflow using the whole ceiling-type air conditioner compared to a commercialized concentrated exhaust air conditioner (normal-type air conditioner) under the same temperature. Salivary α-amylase activity (SAA) was used as an index of sympathetic nervous activity. An acute experiment for a 15 min period was conducted using 12 healthy young female adults. No significant differences in room and skin temperatures were observed between the whole ceiling-type air conditioner and the normal-type air conditioner. The whole ceiling-type air conditioner showed 11.1% lower humidity than the normal-type air conditioner. The whole ceiling-type air conditioner showed one-thirteenth the airflow of the normal-type air conditioner. As a result, the PMV of the whole ceiling-type air conditioner was more comfortable level than the normal one. Moreover, subjective evaluation questionnaire revealed a significant difference was observed in wind perception (windy). The SAA of subjects under the whole ceiling-type air conditioner showed significantly low values compared with the normal-type air conditioner. It was found that the subject's sympathetic nervous activity has been inactivated under the conditions of the whole ceiling-type air conditioner. Thus, it was revealed that the whole ceiling-type air conditioner provides a more comfortable air environment by reducing physical stimulations to humans.

Original languageEnglish
Pages (from-to)1156-1161
Number of pages6
JournalBuilding and Environment
Volume44
Issue number6
DOIs
Publication statusPublished - Jun 1 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Civil and Structural Engineering
  • Geography, Planning and Development
  • Building and Construction

Fingerprint Dive into the research topics of 'Evaluation of environmental and physiological factors of a whole ceiling-type air conditioner using a salivary biomarker'. Together they form a unique fingerprint.

  • Cite this