Browse > Article

Analysis of Comfortable Environment in the Classroom with Humidification and Ventilation in Winter  

Cheong, Seong-Ir (School of Mechanical Engineering, Pusan National University)
Sheng, Nai-Li (School of Mechanical Engineering, Pusan National University)
Kim, Doo-Hyun (School of Mechanical Engineering, Pusan National University)
Lee, Jae-Keun (School of Mechanical Engineering, Pusan National University)
Hwang, Yu-Jin (School of Mechanical Engineering, Pusan National University)
Park, Jong-Hoon (Air Conditioning Division, LG Electronics)
Seo, Seok-Jang (Air Conditioning Division, LG Electronics)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.21, no.7, 2009 , pp. 402-408 More about this Journal
Abstract
In this paper, the effects of ventilation and humidification on thermal comfort and indoor air quality(IAQ) were evaluated in a classroom when a heat pump system was operated in winter. Thermal comfort parameters, such as temperature, relative humidity, globe temperature and air velocity, were measured at 9 points in the classroom. The concentration of $CO_2$ and total suspended particles(TSP) in the classroom were measured in order to analyze IAQ. Temperature distribution in the classroom was decreased by $2{\sim}5^{\circ}C$ when the ventilation system and the humidifier were operated. When the relative humidity was adjusted to 60% by operating the humidifier and the ventilation system, the predicted mean vote(PMV) in the classroom was within the comfortable range of $-0.5{\sim}0.5$. When the ventilation system was operated, the average concentration of $CO_2$ and TSP were decreased by 645 ppm and 0.17 $mg/m^3$, respectively. This paper suggests the humidification and ventilation conditions to maintain the comfortable environment in the school classroom in winter experimentally.
Keywords
Indoor air quality; Ventilation; Humidification; Predicted mean vote; Thermal comfort;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Teodosiu, C., Hohota, R., Rusaouen, G. and Woloszyn, M., 2003, Numerical prediction of indoor air humidity and its effect on indoor environment, Building and Environment, Vol. 38, pp. 655-664   DOI   ScienceOn
2 Shin, H. S., Lee, J. K., Ahn, Y. C., Yeo, C. S., Byun, S. H. and Lee, J., 2005, Measurement of indoor air quality for ventilation with the existence of occupants in schools, Journal of Mechanical Science and Technology, Vol. 19, No. 4, pp. 1001-1005   DOI   ScienceOn
3 ISO 7730, 2005, Ergonomics of the thermal environment-Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria
4 Kim, D. G., Kum, J. S., Choi, K. H., Park, H. W., Kim J. R. and Joo, I. S., 1998, Effects of relative humidity on comfort sensation by comparison between the young and the aged, Korean Journal of Air-conditioning and Refrigeration Engineering, Vol. 10, No. 4, pp. 381-388   과학기술학회마을   ScienceOn
5 Han, C. W., Noh, K. C. and Oh, M. D., 2006, Comparison of the PMV and CO2 concentration characteristic in the lecture room with a different airflow rate of the ventilation system and heating system for heating season, Proceedings of SAREK, pp. 411-416
6 Janssen, J. E., Hill, T. J., Woods, J. E. and Maldonado, E. A. B., 1982, Ventilation for control of indoor air quality：A case study, Environment International, Vol. 8, pp. 487-496   DOI   ScienceOn
7 Park, J., Jang, Y., Ahn, Y., Cheong, S. and Lee, J., 2008, Estimation of appropriate capacity of ventilation system based on the air infiltration rate in korean classrooms, Journal of Mechanical Science and Technology, Vol. 22, No. 4, pp. 1-10   DOI   ScienceOn