A Measurement Study on the Indoor Climate of a College Classroom

作者：Liu Shuzhao^*; Yoshino Hiroshi; Mochida Akashi

来源：International Journal of Ventilation, 2011, 10(3): 251-261.

• classroom
• measurement
• IAQ
• temperature
• humidity
• CO(2)
• ventilation
• air change rate

To clarify the indoor climate in Japanese college classrooms, an air-conditioned, mechanically ventilated classroom of a university was surveyed. Temperatures, humidity and carbon dioxide (CO(2)) concentration in winter and summer were measured before, during and after lessons. The airtightness of the room and the airflow rate of the ventilation system were also measured. In winter, at an outdoor air temperature around 0 degrees C and with the thermostat temperature of the air conditioners set to 30 degrees C, the vertical difference in room air temperature exceeded 10 degrees C. The relative humidity (RH) was about 30% during lesson hours. After half an hour of occupancy, the CO(2) concentration exceeded 1500 ppm in the respiration zone. It subsequently reached 2500 ppm, as measured within the respiration zone at half room height, after a continued 1.5 hours of occupancy. No special thermal or humidity problems were found in the summer survey. However, the CO(2) level was very close to that of winter. The CO(2) concentration decays indicated that the air change rate was 0.82 to 0.87 ac/h, which satisfied the Japanese criterion of 0.3 ac/h for the prevention of formaldehyde, yet it was far below the national criterion of 4.4 ac/h for college classrooms.

• 出版日期2011-12