Effect of humidity and small air movement on thermal comfort under a radiant cooling ceiling by subjective experiments |
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| Affiliation: | 1. Toshiba, Air-Conditioners and Appliances Engineering Laboratories, 8 Shinsugita-cho, Isogo-ku, Yokohama 235, Japan;2. Ochanomizu University, Japan;1. Graduate School of Engineering, University of Tokyo, Tokyo, Japan;2. Institute of Industrial Science, University of Tokyo, Tokyo, Japan;3. Intl. Centre for Indoor Environment and Energy, Technical University of Denmark, Lyngby, Denmark;1. Key Laboratory of Three Gorges Reservoir Region''s Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China;2. National Center for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing, China;3. Department of Medical Sciences, Occupational and Environmental Medicine, Uppsala University, Uppsala SE-751, Sweden;1. International Centre for Indoor Environment and Energy – ICIEE, Department of Civil Engineering, Technical University of Denmark, Nils Koppels Allé, Building 402, 2800 Kgs. Lyngby, Denmark;2. Department of Restoration Ecology and Built Environment, Tokyo City University, 3-3-1 Ushikubo-nishi, Tsuzuki-ku, Yokohama 224-8551, Japan;1. Faculty of Architecture, Planning and Surveying, Universiti Teknologi MARA, 40450 Shah Alam, Selangor Darul Ehsan, Malaysia;2. Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia;3. OYL Research and Development Sdn Bhd, 47000 Sungai Buloh, Selangor Darul Ehsan, Malaysia;1. Centre for Energy and Environment, Malaviya National Institute of Technology, Jaipur 302 017, India;2. Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA |
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| Abstract: | Radiant air-conditioning systems are expected to be more comfortable and superior energy-saving systems than convective air conditioning ones generally used. There are some studies on radiant cooling systems. However, they were seldom put to practical use because of dew point problem in Japan. The objective of this study is to investigate the thermal comfort of local parts of the body and the whole body, in particular, including the effects of humidity (45% rh, 65% rh, 85% rh) and small air movements, by subjective experiments under a radiant cooling system. The experiments have been performed by using radiant cooling panels in a climate chamber. Subjects were seated on a chair under the radiant cooling panels, and voted their thermal sensation and comfortable sensation. The following results were obtained. Even in the radiant cooling system, the influence of humidity and small air movement on thermal sensation votes of the whole body could be correctly estimated by using a standard new effective temperature (SET*) within one scale error of thermal sensation. Small air movement with the radiant cooling system had a possibility of improving the comfortable sensation votes in the radiant cooling. |
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