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

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

DOI QR Code

A Study of Discharge Coefficient for Thermal Buoyancy Natural Ventilation

온도차 자연환기 이론의 유량계수에 대한 연구

  • Shin, Dongshin (Department of Mechanical System Design Engineering, Hongik University) ;
  • Ko, Hyunjun (Department of Mechanical System Design Engineering, Hongik University) ;
  • Kim, Sehyung (Department of Mechanical System Design Engineering, Hongik University) ;
  • Seon, Jihyung (Department of Mechanical System Design Engineering, Hongik University) ;
  • Yoon, Sangmin (Department of Mechanical System Design Engineering, Hongik University) ;
  • Lee, Jinyoung (Himec Co., Ltd.)
  • Received : 2015.09.09
  • Accepted : 2015.10.28
  • Published : 2015.12.10
Download PDF
⟨ Previous Next ⟩

Abstract

This study reviews the discharge coefficient for thermal buoyancy natural ventilation through experimentation. We measure the air velocity at the outlet, which is needed to derive the discharge coefficient and to compare with the theoretical value. When a temperature difference exists between the inside and outside of the building, the measured discharge coefficient differs from the theoretical value with a maximum difference of 12%. The size and position of the openings have little effect on the discharge coefficient. For practical application, the theoretical discharge coefficient can be used with little modification.

Keywords

References

  1. Chen, Q., 2009, Ventilation Performance Prediction for Buildings:A method Overview and Recent Applications, Building and Environment, Vol. l, No. 44, pp. 848-858.
  2. Kim, Y. A., 2013, Now, green construction period., https://jnhkbs.co.kr/?m=bbs&bid=envnews8&uid=252917, Environment daily.
  3. Architectural Institute of Japan, 2011, To see, use and learn Environmental Architecture, Vol. 9, pp. 102-109.
  4. Wilson, D. J. and Kiel, D. E., 1990, Gravity driven counterflow through an open door in a sealded room. Building and Environment, Vol. 25, No. 4, pp. 379-388. https://doi.org/10.1016/0360-1323(90)90012-G
  5. Favarolo, P. A. and Manz, H., 2005, Temperature driven single sided ventilation through a large rectangular openning, Building and Environment, Vol. 40, pp. 689-699. https://doi.org/10.1016/j.buildenv.2004.08.003
  6. Andersen, K. T., 2003, Theory for natural ventilation by thermal buoyancy in one zone with uniform temperature. Building and Environment, Vol. 38, pp. 281-289.
  7. American Society of Heating Refrigeration and Airconditioning Engineers, 2011, ASHRAE Fundamentals Handbook, Atlanta, GA.
  8. Karava, P., Stahopoulos, T., and Athienitis, A. K., 2004, Wind Driven Flow through Openings-A Review of Discharge Coefficients, Int Journal of Ventilation, Vol. 3, No. 3, pp. 255-266. https://doi.org/10.1080/14733315.2004.11683920

Cited by

  1. Recent Progress in Air-Conditioning and Refrigeration Research : A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2015 vol.28, pp.6, 2016, https://doi.org/10.6110/KJACR.2016.28.6.256