Browse Air Conditioning and Refrigeration Center (ACRC) by Title

  • Jain, S.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-05)
    Air conditioning and refrigeration systems are designed to meet the load at some particular design conditions. At off-design conditions, the compressor is either cycled or a variable speed drive enables the compressor ...

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  • Park, C.Y.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2007-01)
    Carbon dioxide (CO2) has been seriously considered as an alternate refrigerant for HCFC and HFC fluids, due to the increasing interest of environmentally safe refrigerants in air-conditioning and refrigeration systems. ...

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  • Hurlburt, E.T.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-02)
    Common refrigeration and air conditioning cycles are dependent on two-phase flow for efficient heat transfer with minimal pressure drop. Design of heat exchangers for these systems is aided by an understanding of the ...

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  • Shedd, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-03)
    Horizontal annular two-phase flow is a very important condition in many common applications, including power generation, air-conditioning, and refrigeration. The purpose of this investigation is to present a broad survey ...

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  • McLevige, S.M.; Muka, J.S.; Miller, N.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-03)
    The purpose of this work was to investigate and characterize the acoustic burst (“popping”) phenomenon occurring in household refrigerators shortly after compressor start-up. An experimental investigation began with ...

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  • Nino, V.G.; Hrnjak, P.S.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-10)
    Aluminum multi-port microchannel tubes are currently utilized in automotive air conditioners for refrigerant condensation. Recent research activities are directed toward developing other air conditioning and refrigeration ...

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  • Hoehne, M.R.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-01)

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  • Traeger, K.M.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2005-06)
    This thesis focuses on microchannel heat exchangers, and the methods used to try and reduce the charge contained in them. First, four condensers were designed and manufactured with the same air side characteristics and same ...

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  • Zhang, X.; Tafti, D.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-04)
    The study classifies and isolates the effects of thermal wake interference that occurs in multilouvered fins. Inter-fin interference occurs between adjacent rows of louvers and is dominant at high flow efficiencies when ...

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  • Boewe, D.E.; McEnaney, R.P.; Park, Y.C.; Yin, J.M.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-07)

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  • Richter, M.R.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-06)
    In the first part of this report, experimental results are presented comparing a prototype R744 system with a commercially available R410A system in heating mode. When the heating capacity of the two systems is matched at ...

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  • Zhang, X.; Tafti, D.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-04)

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  • Cui, J.; Tafti, D.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-05)
    This study presents computational results in a complex three-dimensional louver geometry. The threedimensionality occurs along the height of the fin, where the angled louver transitions to the flat landing and joins with ...

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  • Kim, G.J.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-01)
    Fin-and-tube heat exchangers are commonly used in air-conditioning systems and ,. improving the efficiency of this component is very important. For a fin-and-tube heat exchanger used as an evaporator, moisture from the ...

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  • Korte, C.M.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-08)
    The effects of condensation on the air-side performance of plate-fin-tube heat exchangers have been experimentally investigated by conducting experiments under dry conditions and then repeating these experiments under ...

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  • Kaiser, J.M.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-07)
    The effect of condensate accumulation and shedding on the air-side thermal performance of automotive evaporator coils has been studied. Experiments under wet and dry conditions were conducted to expose the impact of ...

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  • Yin, J.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-01)
    The effect of condensation on air-side heat transfer performance has been studied for plain-fin-and-tube and wavy-louvered heat exchangers with fin spacings of 2.12, 1.57, and 1.27 mm. Wet and dry heat exchanger experiments ...

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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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  • Litch, A.D.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-08)

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