Browse Air Conditioning and Refrigeration Center (ACRC) 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 ...

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  • 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 ...

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  • 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 ...

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  • 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 ...

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  • 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 ...

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  • Ilic, S.M.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-12)
    Effects of compressor on/off cycle times shorter than typical a/c heat exchanger thermal time constant (~1 min) were examined as a method of cooling capacity regulation. Short compressor on/off cycle times enable the ...

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  • 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. ...

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  • 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 ...

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  • 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 ...

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  • Yin, J.M.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-05)
    This document summarizes the evolution of the design of a 10 kW split system residential heat pump, to operate with R744 on the transcritical cycle. It is the first such prototype to be designed, and will be used for ...

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  • 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 ...

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  • 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 ...

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  • Terrell, Jr., W.J.; Mao, Y.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-04)

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  • 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 ...

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  • 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 ...

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  • 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 ...

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  • 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 ...

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  • 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 ...

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  • Stott, S.L.; Bullard, C.W.; Dunn, W.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-08)
    A 2.5 ton, minimum-TEWI split system air conditioner prototype was tested over an extensive range of operating conditions to validate the system simulation model that had been used to design the prototype. The experimental ...

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  • 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 ...

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