Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

Study on the Relationship between Indoor $CO_2$ Concentration and Local Mean Air-age in the Lecture Room with System Air-conditioner and Ventilation Unit for Cooling Loads

냉방시 시스템에어컨과 환기유닛 적응 강의실에서 실내 $CO_2$ 농도와 국소평균공기연령 연구

  • Jang Jae-Soo (School of Mechanical and information Engineering, University of Seoul) ;
  • Noh Kwang-Chul (School of Mechanical and information Engineering, University of Seoul) ;
  • Oh Myung-Do (Department of Mechanical and Information Engineering, University of Seoul)
  • 장재수 (서울시립대학교 기계정보공학과 대학원) ;
  • 노광철 (서울시립대학교 기계정보공학과 대학원) ;
  • 오명도 (서울시립대학교 기계정보공학과)
  • Published : 2005.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

This study is undertaken to evaluate the relationship between the indoor $CO_2$ concentration and the local mean air-age in the lecture room with the occupants. We conducted the experiments to examine the indoor $CO_2$ concentration and the local mean air-age with respect to the supply airflow of the ventilation system and the discharge angle and air-flow of the system air conditioner. Through the experiments, we found out that indoor $CO_2$ concentrations calculated by the prediction equation of Seidel are about 350 ppm lower than those measured by the experiments. The indoor $CO_2$ concentration is not related with the air-flow and the discharge angle of the system air-conditioner, but with the ventilation airflow. From the numerical calculation, the indoor $CO_2$ concentration is not related with the ventilation effectiveness, but strongly with the local mean air-age. In case of our model, the indoor $CO_2$ concentration is likely to fall within the acceptable air quality when the local mean air-age is averagely predicted under 400 seconds.

Keywords

References

  1. Yoon, D. W., 1991, Standard for indoor air pollutnat levels and ventilation rates, Architecture, Vol. 39, No.6, pp.12-18
  2. Han, H. T., 1999, On the definition of ventilation effectiveness, Magazine of the SAREK, Vol. 28, No.1, pp.38-47
  3. Kim, K. H., Choi, H. S., Lee, K. G., Han, H. T. and Kwon, Y. I., 2004, The characteristics of an indoor air environment in office with location of supply and exhaust diffuser, Proceedings of the SAREK 2004 Summer Annual Conference, pp.734-738
  4. Shin, E. S. and Kim, J. W., 2002, A study on the indoor air pollution levels in the classrooms at public schools in Suwon, Korean Journal of Sanitation, Vol. 17, No.1, pp.20-27
  5. Shin, H. S., Yeo, C. S., Byun, S. H., Hou, U. I., Lee, J K, Park, H. S., Kim, B. S., Lee, G. K and Kang, T. W., 2004, Indoor air quality impact of ventilation with the existence of occupants in schools, Proceedings of the SAREK 2004 Summer Annual Conference, pp.713-716
  6. Sea, S. Y., Kim, M. H., Han, H. T. and Kim, Y. I, 1997, Ventilation effectiveness measurements utilizing tracer gas in a thermal environmental chamber, Proceedings of the SAREK 1997 Winter Annual Conference, pp. 415-420
  7. Kim, Y. K., Jung. S. S., Kwon, Y. G. and Yee, J.J., 1999, A study on the calculation method of ventilation requirement using evaluation of ventilation effectiveness (Part I), Proceedings of the AIK Annual Conference, pp. 593-598
  8. KS F 2603, 1996, Method of Measuring Amount of Room Ventilation (Carbon Dioxide Method)