Journal
BUILDING AND ENVIRONMENT
Volume 42, Issue 12, Pages 4034-4042Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2006.06.037
Keywords
humidity; step change; comfort; productivity; subjective experiment
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Subjective experiments were conducted to evaluate the effects of humidity on human comfort and productivity under transient conditions from hot and humid environment to thermally neutral condition. Two climate chambers, Chamber 1 and Chamber 2, adjoined each other were used for this study. Subjects were exposed to 30 degrees C/70%RH air in Chamber 1 for 15 min with 2.0 met of metabolic rate. Then they moved into Chamber 2, where 4 humidity conditions, 30, 40, 50 and 70%RH were examined. Air temperature was adjusted to keep SET* constant at 25.2 degrees C for all conditions. Subjects were exposed in Chamber 2 for 180 min performing 2 kinds of simulated office work. Positive effects of low humidity on subjective pleasantness were found under transient condition at low humidity due to more evaporation from human body, while no significant difference in thermal sensation and humidity sensation among 4 relative humidity levels was obtained. Subjective performance was found to be at the same level under all conditions. However, subjects reported to be more tired at 70%RH after humidity step change. (C) 2006 Elsevier Ltd. All rights reserved.
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