1987 Volume 12 Issue 35 Pages 45-59
The Kita Ward Office Building and its air-conditioning system were designed with the intention of efficiently utilizing energy during the lifetime. The actual performances of energy conservation of the system were analyzed in the previous papers. As the grave role of the air-conditioning is to maintain the comfortable and hygienic conditions of indoor environment, it is necessary to verify the actual conditions of it through measurements and questionnaires. For that purpose, environmental variables such as temperature, humidity, carbon dioxide concentration, dust concentration and illuminance, and conditions which affect these variables, such as numbers of people, states of Venetian blinds and lighting, infiltration through entrance doors and clo value etc. were measured. And the questionnaires to occupants working in the building were carried out. Measurements and Questionaires were conducted in the summer of 1984 and the winter of 1985. The results are summarized as follows; 1) In the summer, the mean values of the actual room air temperature were about 1℃ higher than the designed condition on the first and the second floors, where the infiltration from the entrance doors had great influences on the heat loads of these rooms. In the winter, they were almost the same as the designed condition in all floors. The reason is that the system has had more sufficient capacity of heating in winter than one of cooling in summer. 2) The measurements showed that the concentrations of carbon dioxide and dust were kept within the allowable levels prescribed by the Building Management Code in Japan. The result of questionnaires, however, showed that about a half of the occupants complained about the contamination of the room air, which was caused by smoking. 3) Approximately 40% of the installed fluorescent lamps had been turned on even in the absence of the occupants. This fact indicates that the improvement of the switching circuits or zoning in the lighting system or the use of the task-lighting method could bring great effects for energy conservation.
