Browse Technical Reports - Air Conditioning and Refrigeration Center by Title

  • 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 ...

    application/pdf

    application/pdfPDF (12Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (3Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (6Mb)
  • 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. ...

    application/pdf

    application/pdfPDF (6Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (6Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (908Kb)
  • 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 ...

    application/pdf

    application/pdfPDF (5Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (4Mb)
  • 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. ...

    application/pdf

    application/pdfPDF (8Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (470Kb)
  • 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. ...

    application/pdf

    application/pdfPDF (3Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (16Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (517Kb)
  • 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 ...

    application/pdf

    application/pdfPDF (1Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (6Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (8Mb)
  • 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 ...

    application/pdf

    application/pdfPDF (2Mb)
  • Tafti, D.K.; Zhang, X. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-08)
    The effect of fin pitch, louver angle and thickness, and flow depth on the onset, propagation, and characteristic frequencies of instabilities in multilouvered fins is investigated. The initial instability appears in the ...

    application/pdf

    application/pdfPDF (2Mb)
  • Zeitlow, D.C.; Pederson, C.O. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-04)
    This study is the first to model and experimentally validate refrigerant inventory of R134a in small-channel cross-flow condenserst. This heat exchanger is used in automotive applications and uses smaller internal volumes ...

    application/pdf

    application/pdfPDF (7Mb)
  • Christoffersen, B.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-08)
    Local in-tube heat transfer coefficient and pressure drop data have been collected for R-22 and two potential replacements, R-134a and R-32/R-125, in both smooth and micro-fin tubes. The smooth tube data indicates that ...

    application/pdf

    application/pdfPDF (7Mb)