Browse Technical Reports - Air Conditioning and Refrigeration Center by Title

  • 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)
  • Dobson, M.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-05)
    An experimental study of heat transfer and flow regimes during condensation of refrigerants in horizontal tubes was conducted Measurements were made in smooth, round tubes with diameters ranging from 3.14 mm to 7.04 mm. ...

    application/pdf

    application/pdfPDF (20Mb)
  • Sweeney, K.A.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-05)

    application/pdf

    application/pdfPDF (6Mb)
  • Vardan, A.; Dunn, W.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-11)
    A study of heat transfer and pressure drop characteristics for single-phase and twophase flow of refrigerants in micro channel tubes was conducted. An existing facility was modified to perform tests on a single microchannel ...

    application/pdf

    application/pdfPDF (5Mb)
  • Graham, D.M.; Chato, J.C.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-03)
    R134a condensation experiments have been petfonned over a mass flux range of 75 to 450 kg/m2-s (55 to 330 klbm/ft2-hr) in an 8.91 rom (0.351") inside diameter, axially grooved, microfin tube. At 75 kg/m2-s (55 klbm/ft2-hr), ...

    application/pdf

    application/pdfPDF (1Mb)
  • Felton, K.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-09)
    Experiments to assess the heat transfer and pressure-drop effects of delta-wing vortex generators placed at the entrance of developing channel flows are reported in this study. The experimental geometry simulates common ...

    application/pdf

    application/pdfPDF (6Mb)
  • Zhang, L.W.; Balachandar, S.; Tafti, D.K.; Najjar, F.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-04)
    The heat transfer enhancement mechanisms and the performance of parallel-plate-fin heat exchangers are studied using large scale direct numerical simulation. Geometry effects such as finite fin thickness and fin arrangements ...

    application/pdf

    application/pdfPDF (3Mb)
  • Gentry, M.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-07)

    application/pdf

    application/pdfPDF (6Mb)
  • Gentry, M.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1998-03)
    Single-phase convective heat transfer can be enhanced by modifying the heat transfer surface to passively generate streamwise vortices. The swirling flow of the vortices modifies the temperature field, thinning the thermal ...

    application/pdf

    application/pdfPDF (21Mb)
  • Wattelet, J.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-05)
    An experimental study of flow boiling heat transfer of refrigerants in a horizontal-tube evaporator was conducted. A single-tube evaporation test facility was designed and developed to measure the evaporation characteristics ...

    application/pdf

    application/pdfPDF (14Mb)
  • Admiraal, David M.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-08)

    application/pdf

    application/pdfPDF (4Mb)
  • Whitchurch, M.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-08)
    A humidity addition system was installed in the mobile air-conditioning test facility. The system is able to produce relative humidities at the evaporator inlet in excess of 95% RH. The system is able to control the ...

    application/pdf

    application/pdfPDF (6Mb)
  • Eldredge, B.D.; Alleyne, Andrew G. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-08)
    The benefits of applying advanced control techniques to vapor compression cycle systems are well know. The main advantages are improved performance and efficiency, the achievement of which brings both economic and environmental ...

    application/pdf

    application/pdfPDF (15Mb)
  • Davidson, I.E.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-10)
    This project extends analysis of heat exchanger design tradeoffs in response to two emerging trends: 1) demands for increasing thermal performance while reducing material costs are beginning to raise structural issues; and ...

    application/pdf

    application/pdfPDF (1Mb)
  • McGill, R.O. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-07)
    An investigation of the influences of macroscopic constrictions on the thennal performance of plate-fin heat exchangers is described in this report. Parametric studies cover parameter ranges that are typical of the ...

    application/pdf

    application/pdfPDF (5Mb)
  • Dobson, M.K.; Chato, J.C.; Wang, S.P.; Hinde, D.K.; Gaibel, J.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-06)
    Condensation heat transfer data are reported for R-22 and two potential replacements: R-134a, and a 60%/40%, azeotropic mixture of R-32 and R-125. All condensation data were collected in an 0.18" ID (4.572 mm), smooth ...

    application/pdf

    application/pdfPDF (2Mb)
  • Wattelet, J.P.; Chato, J.C.; Souza, A.L.; Christoffersen, B.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-06)

    application/pdf

    application/pdfPDF (2Mb)
  • Yannayon, B.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2007-05)
    Data now becoming available from prototype low energy residences confirm that peak heating and cooling loads can be reduced by factors of 3 to 5, using currently available technologies. This paper explores the range ...

    application/pdf

    application/pdfPDF (1Mb)
  • Hoke, J.L.; Georgiadis, J.G.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-11)
    Microscopic observations of frost deposition on a variety of substrates having different contact angles, (polytetrafluoroethylene PTFE, kapton, glass and others) allow the quantification of substrate effects on frost ...

    application/pdf

    application/pdfPDF (12Mb)