Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Evaporation heat transfer characteristics inside the U-bend of the smooth and the microfin tube using alternative refrigerant

대체냉매를 사용한 평활관 및 마이크로핀관 곡관부내 증발 열전달 특성

  • 조금남 (성균관대학교 기계공학과) ;
  • 김병기 (성균관대학교 기계공학과)
  • Published : 1997.09.01
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Abstract

The present work experimentally investigated the effects of mass flux, heat flux, inlet quality on the heat transfer performance inside the U-bend of smooth and microfin tube using R-22 and R-407C refrigerants. The parameters were 200 and 400 kg/m$^{2}$ s for mass flux, 6 and 12 kw/m$^{2}$ for heat flux, 0.1 and 0.2 for inlet quality under the pressure of 0.65 MPa. The apparatus consisted of the test section of four straight sections and three U-bends, preheater, condenser, refrigerant pump, mass flow meter etc. The average heat transfer coefficient at the downstream straight section after U-bend was affected by U-bend due to the centrifugal force and mixing of two-phase flow in the U-bend. The average heat transfer coefficient at the U-bend was 4 ~ 33 % higher than that at the straight section. The average heat transfer coefficients were affected in the order of mass flux, heat flux and inlet quality. The average heat transfer coefficients in the microfin tube were lager by 19 ~ 49% and 33 ~ 69% than that in the smooth tube at the straight section and at the U-bend separately. The average heat transfer coefficients for R-407C were larger by 33 ~ 41% and 17 ~ 29% than that for R-22 in the smooth tube and the microfin tube separately.

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References

  1. Participants' Handbook:R-22 Alternative Refrigerants Evaluation Program(AREP) Air Conditioning and Refrigeration Institute
  2. International Journal of Refrigeration v.12 Heat Transfer and Pressure Drop During Evaporation and Condensation of R-22 Horizontal Micro-fin Tube Schlager, L. M.;Pate, M. B.;Bergles, A. E.
  3. Experimental Heat Transfer, Fluid Mechanics and Thermodynamics Measurements of the Heat Transfer Coefficient and Pressure Drop in Flow Boiling of HCFC and HFC Refrigerants in Smooth and Micro-finned Tubes Galli, G.;Laurenti, L.;Marcotullio, F.;Ponticiello, A.
  4. ASHRAE Trans. v.95 Evaporation of R-22 ina 7mm Microfin Tube Kuo, C. S.;Wang, C. C.;Cheng, W. Y.;Lu, D. C.
  5. International Journal of Heat and Mass Transfer v.39 no.12 In-tube Evaporation of HCFC-22 in a 9.52mm Microfin/smooth Tube Kuo, C. S.;Wang, C. C.
  6. Transactions of the ASME;Journal of Heat Transfer v.118 Flow Boiling Heat Transfer Coefficients of R-134a in a Microfin Tube Singh, A.;Ohadi, M. M.;Dessiatoun, S.
  7. 대한기계학회논문집 v.20 no.5 수평평활관과 마이크로핀관내에서 HFC-134a의 응축 및 증발열전달 특성 이상천;박병덕;이재희;한운혁
  8. ASHRAE Transactions v.96 Two-phase Flow Heat Transfer and Friction Chracteristics of R-22 and R-407C Wang, C. C.;Kuo, C. S.;Chang, Y. J.;Lu, D. C.
  9. 서울대학교 박사학위논문 순수 및 혼합냉매의 수평원관내 유동증발 열전달 신지영
  10. 대한기계학회논문집 B 수평원관내 R-22 및 R-407C 증발 열전달계수 측정 최태열;김민수
  11. ASHRAE Trans. v.95 Two-phase Flow Heat Transfer and Pressure Drop Characteristics of R-22 and R-32/125 Wijaya, H.;Spatz, M. W.
  12. Transactions of the ASME;Journal of Heat Transfer v.115 Forced Convective Boiling of Nonazeotropic Refrigerant Mixtures inside Tubes Murata, K.;Hashizume, K.
  13. ASHRAE Trans. v.99 Heat Transfer and Pressure Drop Characteristics of R-134a, R-32, and a Mixture of R-32/R-134a Inside a Horizontal Tube Torikoshi, K.;Ebisu, T.
  14. Int. J. Heat Mass Transfer v.32 no.9 Horizontal Flow Boiling of Pure and Mixed Refrigerants Ross, H.;Radermacher, R.;Di Marzo, M.
  15. Journal of Heat Transfer v.112 A General Correlation for Saturated two-phase Flow Boiling Heat Transfer Inside Horizontal and Vertical Tube Kandlikar, S. G.
  16. ASHRAE Trans. v.4 no.1 Chart Correlation for Saturated Boiling Heat Transfer Equations and Further Study Shah, M. M.
  17. ASHRAE Trans. Evaporation of Refrigerant 12 in a Horizontal Tube with Constant Wall Heat Flux Chaddock, J. B.;Noerager, J. A.
  18. Two-Phase Flow and Heat Transfer. China-US Progress An Experimental Study of CHF in a U-tube by Fluid Modeling Lu, Z.;Yang, R.;Shi, D.
  19. International Journal of Refrigeration v.17 no.4 Forced Convective Heat Transfer of R-22 Evaporating in Upward and Downward Flow in U-bend Ouazia, B.;Marvillet, C.
  20. ASHRAE Handbook : Fundamentals ASHRAE
  21. Dupont General Porperties of Dupont Suva 90000,9100 refrigerant Dupont
  22. Journal of Fluid Engineering v.107 Using Uncertainty Analysis in the Planning of an Experiment Moffat, R. J.
  23. AIAA 26th Aerospace Sciences Meeting Develpment of a Special -Purpose Test Surface Guided by Uncertainty Analysis : Introduction of a New Uncertainty Analysis Step Wang, T.;Simon, T. W.
  24. Refrigeration v.69 no.795 HCFC 代替冷媒の開發現況 : R-22, R-502 代替冷媒 評價 プロダラム 進狀況 森川喜之