Browse Air Conditioning and Refrigeration Center Technical Reports by Title

  • Kirby, E.S.; Bullard, C.W.; Dunn, W.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-07)
    A 1.5 ton window air conditioner was extensively instrumented and tested over a wide range of wet- and dry-coil operating conditions. The results were used to improve a steady-state simulation model. Published air- and ...
    untranslated PDF (5MB)
  • Glabbeek, W.H. Van; Sheiretov, T.K.; Cusano, C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-11)
    The effect of water dissolved in polyalkylene glycol and polyolester oils on the tribological behavior of two material contact pairs in three test environments is evaluated. The material contact pairs are M2 tool steel ...
    untranslated PDF (7MB)
  • Xiaogang, Z; Tafti, D.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-04)
    High resolution time-dependent calculations are performed for developing flow and heat transfer in a multilouvered fin geometry to study the effect of fin pitch. In both cases, transition to unsteadiness occurs in the ...
    untranslated PDF (2MB)
  • Rite, R.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1990-08)
    The effect of frost formation on the performance of a domestic refrigerator-freezer evaporator coil was investigated. A low temperature evaporator test facility was developed to closely simulate refrigerator-freezer ...
    untranslated PDF (11MB)
  • Sweeney, K.A.; Chato, J.C.; Ponchner, M.; Rhines, N.L. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-10)
    The effects of an ester oil, in concentrations up to 5% by mass, on the behavior of R -134a condensing in a microfinned tube with an 18° helix angle were studied experimentally. The flow patterns were only minimally ...
    untranslated PDF (756KB)
  • Ali, D.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-02)
    An investigation was conducted on the effect of frost fonnation on the perfonnance evaporator coils typically found in domestic refrigerator-freezers. The effect of fin spacing on evaporator perfonnance was also studied. ...
    untranslated PDF (3MB)
  • Grebner, J.J. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-02)
    The presence of oil in refrigeration and air conditioning systems reduces the vapor pressure of pure refrigerants and significantly affects the thennodynamic properties of the mixture. This paper presents equilibrium ...
    untranslated PDF (7MB)
  • Cavallaro, A.R.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-07)
    Air-side heat transfer correlations were developed to describe variable conductance models for the condenser and evaporator. Few experimentally estimated parameters described well the changes of refrigerant and air-side ...
    untranslated PDF (482KB)
  • Field, B.S.; Loth, E.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-04)
    Refrigerated air curtains are used in supermarket display cases to keep warm ambient air from entering the refrigerator case. Entrainment of ambient air into the curtain by shear layer mixing contributes to both the ...
    untranslated PDF (5MB)
  • Pira, J.V.; Bullard, C.W.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-08)
    This report describes analyses aimed at integrating component optimization and system design by developing heat-exchanger performance evaluation criteria (PEC) that account for the system-level performance impacts of ...
    untranslated PDF (7MB)
  • Panek, J.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-01)
    The ozone-depleting effect of chlorofluorocarbons (CFC's) has caused an intensive search for alternative fluids to be used in vapor-compression refrigeration and air-conditioning machinery. A promising replacement for CFC-12 ...
    untranslated PDF (290KB)
  • 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., 1993-05)
    Experimental heat transfer coefficients for R-134a, MP-39, and R-12 are reported herein. Tests were conducted using a single-tube evaporator test facility. The test section used was a 2.43 m (8-foot) long, 7.04 mm ...
    untranslated PDF (2MB)
  • Shimon, R.L. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-08)
    This study investigates flow boiling heat transfer and pressure drop characteristics of mixtures of R-134a and an ester based lubricant. Nominal oil concentrations of 1 %, 3%, and 5% are tested. Experimental heat transfer ...
    untranslated PDF (6MB)
  • DeGuzman, N.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-05)
    An experimental study of evaporative heat transfer in a vertical channel with obstructions was conducted. Tests that encompass a range of mass fluxes of 37-220 klbm/ft2-s (50-300 kg/m2-s), heat fluxes of 960-8000 Btu/ft2-h ...
    untranslated PDF (4MB)
  • Davis, M.A.; Jacobi, A.M.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-09)
    The objective of this study was to develop a flexible facility for evaluating the to-scale thermal performance of heat exchangers. During this phase of the project, exchanger testing was completed on three refrigerator ...
    untranslated PDF (6MB)
  • Coulter, W.H.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-06)
    This report identifies and quantifies the cycling losses in a domestic refrigerator-freezer. During cycling operation the refrigerator was found to operate between 5 and 25% less efficient then the corresponding ...
    untranslated PDF (612KB)
  • Peuker, S.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-12)
    This document presents results of experimental and model investigations of two evaporator automotive air conditioning systems using R134a and R744 as refrigerants. The R134a system investigated originated from the vehicle ...
    untranslated PDF (5MB)
  • Liu, Y; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-01)
    This report describes the complete process of testing capillary tube-suction line heat exchangers (CfSLHX). and presents preliminary data for non-adiabatic flow of R-134a in the capillary tube, as well as the comparison ...
    untranslated PDF (9MB)
  • Dobson, M.K.; Chato, J.C.; Hinde, D.K.; Wang, S.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-05)
    Experimental and analytical work has been performed on local heat transfer for intube condensation of pure R-134a and R-12. The data were taken in a 4.57 mm (0.18 in) ill smooth copper tube of 2.90 m (9.5 ft) length. The ...
    untranslated PDF (1MB)
  • El Sherbini, A.I.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-07)
    Longitudinal vortex generation is a technique for enhancing heat transfer. Recent studies have tried to simulate the conditions for vortex generators in heat exchangers. In this work, the effectiveness of delta-wing ...
    untranslated PDF (1MB)