Browse Technical Reports - Air Conditioning and Refrigeration Center by Title

  • Collins, C.D.; Miller, N.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-07)
    An experimental study of the the transient behavior of an automobile arr conditioning system was performed. The experiments were conducted on an original equipment air conditioning system modified for laboratory ...

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  • Greenfield, K.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-09)
    This thesis describes the development of an experimental facility for testing capillary-tube expansion devices and presents preliminary data for flow of R-134a in a non-adiabatic capillary tube. The capillary tube is the ...

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  • Yu, N.; Polycarpou, Andreas A.; Conry, T.F. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-03)
    Scuffing as a phenomenon has been studied for many years, however, the mechanism underlying scuffing remains unexplained. Recent findings suggest that the most significant changes occur in the top 50 – 100 nm of the surface, ...

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  • Rubio-Quero, J.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-07)
    A majority of the design and component selection processes for mobile air conditioning systems are based on results obtained from steady-state analyses. Although valuable, these steady-state tests do not accurately ...

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  • Gonzalez G, J.M.; Jabardo, J.M.S.; Stoecker, W.F. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-12)
    This paper is a literature review and correlation of data on falling film and spray evaporators. This type of evaporator offers the potential advantages of improved heat-transfer coefficients and a reduction in charge ...

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  • Noonan, A.M.; Miller, N.R.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-08)
    A fault detection and diagnosis (FDD) method was used to detect and diagnose faults on both a refrigerator and an air conditioner during normal cycling operation. The objective of the method is to identify a set of sensors ...

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  • Goslovich, K.S.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-05)
    The goal of this study was to determine whether extruded aluminum tubing could be used in the manufacture of a condenser and evaporator for a domestic refrigerator that would be competitive with conventional technology. ...

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  • Herbst, G.W.; Newell, T.A.; Korst, H.H. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-08)
    The use of a pressure exchanger, or wave rotor, in an air-cycle air conditioner is examined as an alternative to vapor-compression cycles which use chloroflourocarbons (CFC's), hydrochlorofluorocarbons (HCFC's) and ...

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  • Tafti, D.K.; Cui, J. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-01)
    Three-dimensional simulations of four louver-tube junction geometries are performed to investigate the effect on louver and tube friction and heat transfer characteristics. Three Reynolds numbers, 300, 600 and 1100, based ...

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  • Harshbarger, D.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-08)
    This report describes a method that allows finite element solutions to be simply implemented within a Newton-Raphson (NR) solution. The ACRC air conditioner system simulation model has been modified to accurately simulate ...

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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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  • Zeller, S.E.; Weaver, R.L.; Dutton, J.C.; Jacobi, A.M.; Balachandar, S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-04)
    Project 84 concentrated on understanding the noise generating mechanisms of axial-flow fans with the intent of proposing methods of component design and system assembly by which noise generation is reduced or minimized. ...

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  • Zhang, X.; Tafti, D.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-04)
    The paper studies the effect of Reynolds number, fin pitch, louver thickness, and louver angle on flow efficiency in multi-louvered fins. Results show that flow efficiency is strongly dependent on geometrical parameters ...

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  • Bellows, K.D. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-07)
    This study involves visualization of the flow through louvered fins Jor automotive heat exchangers. Stereolithography scale models (10.5: 1) of the louvered fins are used with dye-in-water injection to observe the flow. ...

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  • DeJong, N.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-01)
    In many compact heat exchanger applications, interrupted-fin surfaces are used to enhance air-side heat transfer performance. One of the most common interrupted surfaces is the louvered fin. The goal of this work is to ...

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  • Nino, V.G.; Jassim, E.W.; Hrnjak, P.S.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2005-07)
    A flow-regime based pressure drop model is developed to correlate experimental data in the intermittent and annular flow regime. For the intermittent region, an alternative method for microchannel pressure drop predictions ...

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  • Volker, S.; Vanka, S.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-04)
    Fluid flow and heat transfer in a two-dimensional serpentine channel was investigated numerically for Reynolds numbers between 175 and 725. A fifth-order finite differencing scheme was employed to carry out the ...

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  • Graham, T.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-06)
    An experimental study of friction and heat transfer characteristics for single-phase flow in microchannel condenser tubes was conducted. Data were collected for the adiabatic flow of nitrogen, and also for the diabatic ...

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  • Storey, B.D.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-07)
    An experimental study of frost growth under the influence of streamwise vortices in a laminar channel flow is presented. A new model of frost growth is developed to normalize the growth rate of frost with respect to the ...

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  • Suh, A.Y.; Polycarpou, Andreas A.; Conry, T.F. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-03)
    Scuffing that occurs at tribological contacts in mechanical components, brings about topographical, chemical, and mechanical changes mainly at the sub-micron surface. In this project, extensive studies involving the use ...

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