Browse Technical Reports - Air Conditioning and Refrigeration Center by Subject "refrigerant-side evaporation condensation studies"

  • Sweeney, K.A.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-04)
    Condensation of a near-azeotropic mixture of 45% R-32 and 55% R-125 has been studied in a microfinned tube. The local behavior of heat transfer coefficient and the pressure drop was found to be a function of both quality ...

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  • Gaibel, J.A.; Chato, J.C.; Dobson, M.K.; Ponchner, M.; Kenney, P.J.; Shimon, R.L.; Villaneuva, T.C.; Rhines, N.L.; Sweeney, K.A.; Allen, D.G.; Hershberger, T.T. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-05)
    This study examined local condensation heat transfer and pressure drop for a pure 50/50% mixture of R- 32/125 and for R-32/125 mixed with approximately 1%, 3%, and 5% concentrations of an ester oil. An apparatus was built ...

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  • Kenny, P.J.; Chato, J.C.; Dobson, M.K.; Wattelet, J.P.; Gaibel, J.A.; Ponchner, M.; Shimon, R.L.; Villaneuva, T.C.; Rhines, N.L.; Sweeney, K.A.; Allen, D.G.; Hershberger, T.T. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-07)
    This experimental study examined the local heat transfer coefficients and frictional pressure gradients of a ternary zeotropic refrigerant mixture, R-32/R-125/R-134a (23%/25%/52%) condensing in a smooth, horizontal tube. ...

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  • Ponchner, M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-04)
    An experimental study of local condensation heat transfer and pressure drop characteristics of HFC-134a in an 18° helix angle, 0.375" o.d. micro-finned tube was , conducted. The main goal of the study was to compare the ...

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  • Hinde, D.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-10)
    This study investigated local condensation heat transfer and pressure drop for pure R- 12, pure R-134a and R-134a/oil mixtures and examined the results based on two-phase flow patterns. Condensing conditions simulated ...

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  • Wattelet, J.P.; Chato, J.C.; Souza, A.L.; Christoffersen, B.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-05)
    Experimental heat transfer coefficients for R-134a, MP-39, and R-12 are reported herein. Tests were conducted using a single-tube evaporator test facility. The test section used was a 2.43 m (8-foot) long, 7.04 mm ...

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  • Shimon, R.L. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-08)
    This study investigates flow boiling heat transfer and pressure drop characteristics of mixtures of R-134a and an ester based lubricant. Nominal oil concentrations of 1 %, 3%, and 5% are tested. Experimental heat transfer ...

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  • Dobson, M.K.; Chato, J.C.; Hinde, D.K.; Wang, S.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-05)
    Experimental and analytical work has been performed on local heat transfer for intube condensation of pure R-134a and R-12. The data were taken in a 4.57 mm (0.18 in) ill smooth copper tube of 2.90 m (9.5 ft) length. The ...

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  • Villaneuva, T.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-08)
    This study investigates the heat transfer and pressure drop characteristics of a 45/55% by weight mixture of R321R125. For mass fluxes above 150 x 103 Ibm/ft2_h (200 kglm2-s) and heat fluxes below 6400 Btu/ft2_h (20 ...

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  • Christoffersen, B.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-08)
    Local in-tube heat transfer coefficient and pressure drop data have been collected for R-22 and two potential replacements, R-134a and R-32/R-125, in both smooth and micro-fin tubes. The smooth tube data indicates that ...

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  • Dobson, M.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-05)
    An experimental study of heat transfer and flow regimes during condensation of refrigerants in horizontal tubes was conducted Measurements were made in smooth, round tubes with diameters ranging from 3.14 mm to 7.04 mm. ...

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  • Sweeney, K.A.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-05)

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  • Wattelet, J.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-05)
    An experimental study of flow boiling heat transfer of refrigerants in a horizontal-tube evaporator was conducted. A single-tube evaporation test facility was designed and developed to measure the evaporation characteristics ...

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  • Dobson, M.K.; Chato, J.C.; Wang, S.P.; Hinde, D.K.; Gaibel, J.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-06)
    Condensation heat transfer data are reported for R-22 and two potential replacements: R-134a, and a 60%/40%, azeotropic mixture of R-32 and R-125. All condensation data were collected in an 0.18" ID (4.572 mm), smooth ...

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  • Wattelet, J.P.; Chato, J.C.; Souza, A.L.; Christoffersen, B.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-06)

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  • Dobson, M.K.; Wattelet, J.P.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-06)

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  • Kirshbaum, D.J.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-06)
    A Microsoft Excel spreadsheet program developed previously at ACRC to optimize condenser size with respect to surface area has been modified. A new method of modeling pipe bends has been developed incorporating a new ...

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  • Souza, A.L.; Chato, J.C.; Jabardo, J.M.S.; Wattelet, J.P.; Panek, J.S.; Christoffersen, B.R.; Rhines, N. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-10)
    A single tube evaporator test facility capable of measuring pressure drop and heat transfer coefficients inside horizontal tubes has been designed and developed at the Air Conditioning and Refrigeration Center at the ...

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  • Wang, S.P.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-08)
    The fundamental physics and application of boiling and condensation of mixtures have attracted more and more attention. In this paper, the recent research in this field is reviewed. More than one hundred papers concerned with ...

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  • Smith, M.K.; Wattelet, J.P.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-01)
    An average R12 refrigerant correlation has been developed for the mass flux range of 25-100 kg/m2-s and the heat flux range of 2-10 kW/m2. Refrigerant mixtures of 80% R22/lO% R141b and 65% R22/35% R123 have also been ...

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