Browse by Subject "R-22 alternatives"

  • Sweeney, K.A.; Chato, J.C.; Ponchner, M.; Rhines, N.L. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-10)
    The effects of an ester oil, in concentrations up to 5% by mass, on the behavior of R -134a condensing in a microfinned tube with an 18° helix angle were studied experimentally. The flow patterns were only minimally ...

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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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  • Nygaard, T.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-04)
    This work evaluates the performance and control of split system air conditioners charged with a zeotropic, HCFC-22 alternative consisting of HFC-32, HFC-125, and HFC-134a (23%,25%, and 52% respectively). The study involves ...

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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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  • 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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  • Meyer, J.J.; Dunn, W.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-08)
    This study examines the heat transfer and pressure drop performance of R22 and R502 alternatives, most of which are mixtures of two or three refrigerants, while condensing in an enhanced tube and while expanding in a ...

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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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  • Ragazzi, F. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-04)
    A study was conducted to determine the influence of heat exchanger design on the performance of residential air-conditioning systems using zeotropic mixtures as HCFC-22 alternatives. A computer simulation of the evaporator ...

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