Browse Technical Reports - Air Conditioning and Refrigeration Center by Title

  • Winkler, C.M.; Vanka, S.P.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-10)
    In the current dissertation work, the preferential concentration and deposition of heavy solid particles in a downward, fully developed turbulent square duct flow are studied using large eddy simulations. A second-order ...

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  • Tafti, D.K.; Zhang, X.; Huang, W.; Wang, G. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-04)
    The paper describes the computational procedure and results from large-eddy simulations in a complex three-dimensional louver geometry. The three-dimensionality in the louver geometry occurs along the height of the fin, ...

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  • Kearney, S.P.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-01)
    Finned tube heat exchangers are important because of their direct impact on energy and material use in petrochemical, power, transportation, and HV AC/R systems. The design of effective heat exchangers has direct social, ...

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  • Georgiadis, J.G.; Ramaswamy, M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-10)
    Full-field quantitative visualization of freezing interfaces requires the introduction of high resolution noninvasive methods. Magnetic Resonance Imaging (MRI) is a versatile tool for mapping the distribution of liquids ...

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  • Drozdek, J.C.; Chappell, J.D.; Cusano, C.; Hrnjak, P.S.; Miller, N.R.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-07)
    A study was performed on a swashplate compressor to determine the state of lubrication. Measurements of electrical resistance were taken as a primary measure of oil film lubrication at the sliding shoe/swashplate interface. ...

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  • Chappell, J.D.; Drozdek, J.C.; Cusano, C.; Hrnjak, P.S.; Miller, N.R.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-07)
    This study used previously developed instrumentation to determine the state of compressor lubrication in an automotive NC system during three transient tests. The primary technique used in the study was measurement of ...

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  • Rybnikar, F.; Geil, P.H. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-05)
    The morphology of a number of polyamides (P A) of current and potential use for mobile air conditioning and refrigerant tubing, namely PA-6, PA-66, PA-6/PA-66 blends and PA-6/PA-66 copolymers, as prepared from the melt ...

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  • Drozdek, J.C.; Chappell, J.D.; Cusano, C.; Hrnjak, P.S.; Miller, N.R.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-02)
    Understanding lubrication failures at the shoe/swash plate contact of automotive swash plate compressors will greatly enhance the reliability of the air conditioning system. Maintaining proper lubrication is not always ...

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  • Barnes, P.R.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-08)
    A simulation model was developed to investigate strategies for reducing total equivalent warming impact (TEWI) in compact water chillers. The focus was on minimizing R-410A refrigerant charge while increasing efficiency. ...

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  • Zietlow, D.C.; VanderZee, J.C.; Pederson, C.O. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-09)
    This study uses a semi-theoretical steady state computer simulation of an automotive air conditioning system to evaluate design options. The simulation has been validated with experimental data. Influence coefficients ...

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  • Reeves, R.N. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-01)
    This paper examines a set of simple equations describing a domestic refrigerator/freezer system and suggests several modeling improvements, based on experimental results. The experimental setup is described and limitations ...

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  • Porter, K.J.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-12)

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  • El Sherbini, A.I.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-02)
    Water usually condenses on the air-side surfaces of evaporators in air-conditioning and refrigeration applications. The accumulating condensate on a heat exchanger significantly affects its thermal and hydraulic performance. ...

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  • Darr, J.H. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-02)
    The objective of the current study was to develop a model for the steady-state performance of a reciprocating automotive air conditioning compressor. The model equations were composed of analytical equations based on ...

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  • Hurlburt, E.T. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-08)
    Zeotropic refrigerant mixtures are of interest to the air-conditioning and refrigeration industry. In experiments on evaporators and condensers using zeotropic mixtures, heat transfer has been observed to be less than ...

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  • Vij, A.K.; Dunn, W.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-05)
    This work focusses on the modeling of two-phase flows in horizontal, constant-crosssection tubes by a two-fluid approach. The objectives are to develope a framework for two-fluid modeling, to highlight issues related to ...

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  • Hahn, G.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-06)
    A model capable of simulating the preformance of room air conditioners was developed. The new model uses a Newton-Raphson solution scheme framework in which the equations are uncoupled from the solution algorithm. The ...

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  • Kirkwood, A.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-03)
    A steady-state microchannel split-system simulation model has been developed based on previous research at the ACRC. This model was utilized as a design tool to optimize a microchannel split system with the goal of ...

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  • Singh, G.M.; Rodarte, E.; Miller, N.R.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-04)
    This paper presents several modifications to the 1995 IEC standard model for predicting the aerodynamic noise generated by control valves in ideal gas. The modifications account for frictional pressure drop from the valve ...

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  • Ragazzi, F. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1991-10)
    Due to environmental concerns, several refrigerants currently used by the air-conditioning and refrigeration industry are expected to be gradually phased-out by the turn of the century. Possible ozone-safe replacement ...

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