세관내 R-22 대체냉매의 응축압력강항에 관한 연구

DOI QR코드

DOI QR Code

오후규;손창효;최영석;김기수
O, Hu-Gyu;Son, Chang-Hyo;Choe, Yeong-Seok;Kim, Gi-Su

  • 발행 : 2001.09.01

초록

The condensation pressure drop for pure refrigerants R-22, R-134a, and a binary refrigerant mixture R-410A flowing in a small diameter tube was investigated. The test section is a counterflow heat exchanger with refrigerant flowing in the inner tube and coolant flowing in the annulus. The test section consists of 1220 [mm] length with horizontal copper tube of 3.38 [mm] outer diameter and 1.77 [mm] inner diameter. The refrigerant mass fluxes ranged from 450 to 1050 [kg/(㎡$.$s)] and the average inlet and outlet qualities were 0.05 and 0.95, respectively. The main experimental results were summarized as follows : In the case of single-phase flow, the pressure drop of R-134a is much higher than that of R-22 and R-410A for the same Reynolds number. The friction factors for small diameter tubes are higher than those predicted by Blasius equation. In the case of two-phase flow, the pressure drop increases with increasing mass flux and decreasing quality. The pressure drop of R-134a is much higher than that of R-22 and R-410A for the same mass flux. Most of correlations proposed in the large diameter tube showed enormous deviations with experimental data. However, the correlation predicted by Honda et al showed relatively good agreement with experimental data for R-134.

키워드

대체냉매;이성분혼합냉매;응축압력강하;세관

참고문헌

  1. Azer, N. Z., Abis, L. V., and Soliman, H. M., 1972, 'Local Heat Transfer Coefficients Curing Annular Flow Condensation,' ASHRAE Trans., Vol. 28, part. 2, pp. 135-143
  2. 藤井哲, 本田博司, 長田孝志, 野律滋, 1976, '冷媒 R-11の 水平管內凝縮(第1報, 流動樣式 및 壓力降下),' 日本機械學會論文集(B編), 第 32淃, 第 363 號 , pp. 3541-3548
  3. 홍진우, 노건상, 정재천, 오후규, 2001, '세관내 R-22와 R-134a의 응축전열특성에 관한 연구,' 대한기계학회 논문집(B), 제 25권, 제1호, pp. 54-61
  4. 홍진우, 오후규, 2000, '세관내 대체냉매의 응축전달 특성,' 공기조화 냉동공학회, 제 28권, 제5호, pp. 396-402
  5. Torikoshi, K., Ebisu, T., 1993, 'Heat Transfer and Pressure Drop Characteristics of R-134a Inside a Horizontal Tube,' ASHRAE Transaction Research, Vol. 99(2) pp. 90-96
  6. Ebisu, T., Torikoshi, K., 1998, 'Heat Transfer Characteristics and Correlations for R-410A Flowing Inside a Horizontal Smooth Tube,' ASHRAE Transaction Symposia, Vol. 104 (2), pp, 556-561
  7. 이상용, 김병우, 김무환, 1993, 이상유동 열전달(Two-Phase flow Heat Transfer), 대영사, pp. 79-80
  8. Triplett, K. A., Ghiaasiaan, S. M., Adel Khalik, S. I., LeMouel, A., McCord, B. N., 1999, 'Gas-Liquid Two-Phase Flow in Micro Channels,' Int. J. of Multiphase Flow, Vol. 25, pp. 395-410 https://doi.org/10.1016/S0301-9322(98)00055-X
  9. Premoil, A., Francesco, D., Prina, A., 1971, 'A Dimensionless Correlation for Determining the Density of Two Phase Flow Mixtures,' Lo Termotecnica 25, pp. 17-26
  10. Honda, H., Nozu, S.,Matusuoka, Y., and Nakata, H., 1989, 'Condensation of R-11 and R-113 in the Annuli of Horizontal Double-Tube Condensers with an Enhanced Inner Tube,' Experimental Thermal and Fluid Science 2 : 173 https://doi.org/10.1016/0894-1777(89)90031-9
  11. 손창효, 이호림, 정진호, 최영석, 오후규, 2000, '세관내 HFC계 대체냉매의 압력강하에 관한연구,' 대한기계학회 2000년도 춘계학술발표회논문집(B), pp. 347-352
  12. Mala, G. M., Li, D. and Dale, J. D., 1997, 'Heat Transfer and Fluid Flow inMicro Channels,' Int. J. of Heat and Fluid Flow, Vol. 20, pp. 149-157
  13. 조강래, 유정렬, 강신형, 1994, 유체역학, 희중당, 3판, pp. 362-363
  14. Halim Wijaya, Mark W. Spatz., 1995, 'Two-Phase Flow Heat Transfer and Pressure Drop Characteristics of R-22 and R-32/125,' ASHRAE Transaction, Vol. 101, Part. 2, pp. 1020-1026
  15. Yan, Y. Y., Lin, T. F., 1999, 'Condensation Heat Transfer and Pressure Drop of Refrigeration R-134a in a Small Diameter Pipe,' Int. J. of Heat and Mass Transfer, Vol. 42, pp. 697-708 https://doi.org/10.1016/S0017-9310(98)00195-1
  16. Yand, C.-Y., Webb, R. L., 1996, 'Friction Pressure Drop of R-12 in Small Hydraulic Diameter Extruded Aluminum Tubes with and without Micro-fins,' Int. J. of Heat and Mass Transfer, Vol. 39, No. 4, pp. 801-809 https://doi.org/10.1016/0017-9310(95)00151-4
  17. 오종태, 飛原, 英治, 2000, 'HFC계 순수냉매 및 3성분 혼합냉매의 수평관내 응축열전달,' 대한기계학회논문집, pp. 233-240
  18. 김만회, 신정섭, 임병환, 1998, '외경 9.52mm 평활관 및 미세핀관내 R22와 R410A의 증발열전달 특성,' 대한기계학회논문집(B), 제22권, 제10호, pp. 1454-1464
  19. 신지영, 김민수, 노승탁, 1996, '순수 및 혼합냉매의 원관내 증발열전달 실험,' 대한기계학회논문집(B), 제20권, 제2호, pp. 730-740
  20. 손창효, 정진호, 오종택, 오후규, 2001, '세관내 R-22 대체냉매의 응축열전달에 관한 연구,' 대한기계학회논문집(B), 제25권, 제2호, pp. 180-186
  21. 황수민, 김경기, 정동수, 김종보, 1999, '열전달 촉진관에서 R22 대체냉매의 외부 응축열전달계수,' 대한기계학회논문집, 제23권, 제4호, pp, 459-469
  22. 윤석호, 김민수, 1999, '액정을 이용한 R-22와 R-407C의 원주방향 증발열전달계수의 측정,' 대한기계학회논문집, 제23권, 제4호, pp. 502-510