가변유량 밸런싱밸브를 적용한 온수 난방시스템의 유체역학적 성능 평가

Fluid Dynamic Performance in a Hot-Water Heating System with a Variable-Flow-Rate Balancing Valve

  • 허전 (서울산업대학교 에너지환경대학원) ;
  • 이석종 (서울산업대학교 에너지환경대학원) ;
  • 성재용 (서울산업대학교 기계공학과) ;
  • 이명호 (서울산업대학교 기계공학과)
  • Hur, Jurn (Graduate School of Energy & Environment, Seoul National University of Technology) ;
  • Lee, Suk- Jong (Graduate School of Energy & Environment, Seoul National University of Technology) ;
  • Sung, Jae-Yong (Department of Mechanical Engineering, Seoul National University of Technology) ;
  • Lee, Myeong-Ho (Department of Mechanical Engineering, Seoul National University of Technology)
  • 발행 : 2007.08.10

초록

A variable-flow-rate balancing valve has been developed and optimized to apply to a distributor in a hot-water heating system. Fluid dynamic performance of the system was evaluated by comparing the results with the previous pressure difference control valve (PDCV) system. In view of the variations of pressure drop and flow rate according to the sequential closing of the control valves, the present system which is named "smart system distributor", is very stable without a certain flow rate concentration. The level of pressure drop variation is also low as compared with the previous system with a PDCV. In view of the occurrence of cavitation, the present system is quite superior to the previous system because the instantaneous pressures at all sections are much higher than the vapor pressure. On the other hand, the previous system has a possibility of cavitation when one or more control valves are closed.

키워드

참고문헌

  1. Jung, W. H., 2005, Necessity of differential by-pass valve in heating system, Magazine of the SAREK, Vol. 34, No. 8, pp. 58-62
  2. Yoon, W. K., 2005, Flow rate balancing method in variable flow system, Magazine of the SAREK, Vol. 31, No. 9, pp. 39-45
  3. Kim, K. W., Lee, G. N., 2005, Configuration and key technology in floor heating-system, Magazine of the SAREK, Vol. 34, No. 8, pp. 16-27
  4. Hur, J., Lee S., Sung, J,. Lee, M. H. and Yoon, J, D., 2006, Performance test of pressure and flow rate in a hot-water heating system with 3-way valves for flow by pass, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 19, No. 3, pp. 193-206
  5. Pollet, G., 1993, Balancing heating systems -design and operation-, Magazine of the SAREK, Vol. 22, No. 3, pp. 193-206
  6. Lee, J,-H., 1993, An experiment for apartment heating with water system equipped with the constant-flow-rate or variable-flowrate balancing valve, Proc. of the SAREK Lecture Meeting, pp. 73-93
  7. Brennen, C. E., 1995, Cavitation and bubble dynamics, Oxford University Press, New York
  8. Yoon, G. and Choi, H., 2003, Characteristics of flow-induced noise around a sphere, Proc. of the KSME 2003 Autumn Annual Meeting, pp. 810-815
  9. Han, H. T. Kim, J, M. and Kim, J, P., 1994, A study on water hammer phenomena in piping systems of buildings, Journal of KSME, Vol. 18, No. 9, pp. 2251-2256