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Paper 5
A Measurement
Study on the Indoor Climate of a College Classroom
Shuzhao
Liu, Hiroshi Yoshino and Akashi Mochida
School
of Engineering, Tohoku University, Japan
Abstract
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 (CO2)
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 ºC and with the thermostat temperature of the
air conditioners set to 30 ºC, the vertical difference in room air
temperature exceeded 10 ºC. The relative humidity (RH) was about 30%
during lesson hours. After half an hour of occupancy, the CO2
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 CO2 level was very close to that of winter. The CO2
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.
Key words:
classroom,
measurement, IAQ, temperature, humidity, CO2, ventilation, air
change rate.
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Contents
Paper
1
System Design for Demand Controlled Ventilation in Multi-Family Dwellings
Paper
2
A Long-Term Modelling Study of Ventilation and VOC Distribution in
Multi-family Residential Buildings in the Severe Cold Region of China
Paper
3
Evaluating the Influence of Window Types on the Natural Ventilation
Performance of Residential Buildings in Hong Kong
Paper
4
Effects of Urban Ventilation Patterns on the Carbon Monoxide Concentration
in a High-Rise Mega City
Paper
5
A Measurement Study on the Indoor Climate of a College Classroom
Paper
6
Natural Personalised Ventilation - A Novel Approach
Paper
7
Experimental Study of Turbulent Structures in a Non Isothermal Horizontal
Jet Issuing from a Round Nozzle Distanced from a Wall
Paper
8
Case Study Assessment of Local and General Thermal Comfort by Means of
Local Skin Temperature
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