Browse Technical Reports - Air Conditioning and Refrigeration Center by Title

  • 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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  • 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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  • 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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  • 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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  • Bonhomme, D.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1991-10)
    A single tube condenser test facility capable of measuring heat transfer coefficient of condensing refrigerants in horizontal tube has been built and implemented at the Air Conditionning and Refrigeration Center at 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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  • Pourmohamadian, N.; Philpott, Michael L.; Shannon, Mark A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-08)
    Non-metallic, flexible, thin, microchannel heat exchangers made from heat-sealable polyimide films have recently been developed for refrigeration and air-conditioning applications. In order for these heat exchangers ...

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  • Rasmussen, B.P.; Shah, R.; Musser, A.B.; Alleyne, Andrew G.; Bullard, C.W.; Hrnjak, P.S.; Miller, N.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-10)
    This thesis details the efforts to develop a dynamic model of a transcritical vapor compression system suitable for multivariable control design purposes. The modeling approach is described and the developed models are ...

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  • Andrade, M.A.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-07)
    Residential-scale ale systems control indoor temperature but not humidity. The advent of variable-speed compressors and blowers make such control possible. This paper uses a detailed simulation model to explore the ...

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  • Aldana, J.P.; Georgiadis, J.G.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-03)
    The connection between chlorofluorocarbons and ozone depletion has prompted a resurgence in the study of environmentally friendly refrigerants for heat exchanger applications. Recent studies have shown compact heat exchangers ...

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  • Krause, P.E.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-07)
    The cycling losses of a domestic refrigerator-freezer are quantified to gain a better understanding of the adjustments needed to enable a steady-state refrigerator model to be used to design for cycling operation. ...

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  • Mina, E.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-09)
    Separately dealing with the latent load, the load associated with moisture content in air, in air conditioning applications can lead to better efficiencies and better control of the indoor environment. This research studies ...

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  • Carlson, D.M.; Hrnjak, P.S.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-06)
    Frost deposition across a typical eight-row deep refrigeration display case heat exchanger was studied under varying conditions of face velocity, refrigerant temperature glide, and absolute humidity. The heat exchanger, ...

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  • Andres, D.J. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-09)
    Microchannel tubing is a relatively new heat-exchanger technology which involves internal heat transfer enhancements. Although microchannel technology offers tremendous design flexibility, it is not well understood. As ...

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  • Luhrs, D.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-07)
    A test facility was built for the purpose of performing heat transfer studies on microchannel heat exchangers. The studies will involve condensation of refrigerant 134a inside the enhanced tubes,' although no condensation ...

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  • Weston, P.G. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-05)
    Compared to other air-conditioning and refrigeration systems, mobile air-conditioning systems are unique in the respect that they operate almost entirely under transient conditions. The major operating transients include: ...

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  • Peixoto, R.A.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-02)

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  • Johnson, M.F.G. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-09)
    This report describes the development of an experimental apparatus for testing small-bore diameter expansion devices or capillary tubes. Interest in basic refrigeration studies has increased due to the introduction of ...

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