Browse Air Conditioning and Refrigeration Center (ACRC) by Title

  • Scott, M.A.; Kyritsis, D. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2007-05)
    Quantitative visualization of CO2-oil mixture flows through channels that simulate CO2 expansion devices was pursued. The existence of traces of lubricant oil (specifically polyolester (POE)) in the working medium makes the ...

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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., 2000-04)
    A first principles-based model was developed for a transcritical C02 gas cooler, using a finite element method. The model uses published correlations for refrigerant and airside heat transfer and pressure drop. Experimental ...

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  • Sheth, V.P.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2005-06)

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  • Johnston, C.E.; Miller, N.R.; Dunn, W.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-07)

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  • Martz, W.L.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-10)
    The solubility and miscibility refrigerant-oil mixtures are important in understanding the performance of refrigeration and air-conditioning systems. The objective of this study was to provide useful information on the ...

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  • Jensen, A.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-07)
    A refrigerant-side instrumentation system has been developed, installed, and utilized to obtain steady-state data from a 1.5-ton capacity room air conditioner for the continued validation of a simulation model. This ...

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  • Kulkarni, T.; Bullard, C.W.; Cho, K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-06)
    The present study examined design issues of microchannel evaporators associated with the flow maldistribution caused due to header pressure gradient. The effects of mass flow maldistribution on microchannel heat exchanger ...

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  • Goodson, M.P.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-08)
    This report describes the development of a refrigerator/freezer model (RFSIM) that is capable of running in either design mode (user-specified superheat and subcooling) or full simulation mode. The primary purpose was ...

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  • Solberg, J.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-01)
    As the digital age engulfs our society, more and more devices surrender to the inevitable fate of digital control. Routinely, digital electronics replace traditional mechanical systems usually yielding an improvement in ...

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  • Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-12)
    Energy and global warming indices for ten major appliances have been examined. A two-page summary report for each appliance category has been written as well as a combined summary for major appliances. The appliances ...

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  • Stone, K.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-08)
    This paper features a broad discussion on the application of enhanced heat transfer surfaces to compact heat exchangers. The motivation for heat transfer enhancement is discussed, and the principles behind compact heat ...

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  • Wang, S.P.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-08)
    The fundamental physics and application of boiling and condensation of mixtures have attracted more and more attention. In this paper, the recent research in this field is reviewed. More than one hundred papers concerned with ...

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  • Mullen, C.E.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-07)
    Increasingly stringent energy standards and the redesigning of room air conditioners for use with alternative refrigerants have highlighted the need for design and simulation models that are accurate, easy to modify, and ...

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  • Cavatorta, M.P.; Whittenhall, J.; Cusano, C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-09)
    In Part I of this two part paper, extensive surface analysis is done to examine surface changes caused by different run-in procedures on 390-T6 aluminum pins sliding against 1018 carburized steel disks. The area contact ...

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  • Sheiretov, T.K.; Cusano, C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-08)
    Some typical applications where scuffing may occur are gear teeth, piston rings and cylinder pairs, cams and followers, splines, sleeve bearings, and parts of swash and wobble plate compressors. Unlike other tribology-related ...

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  • Yoon, H.K.; Cusano, C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-01)
    A few among many otherwise highly successful lubricated sliding components fail catastrophically and without warning. This sudden mode of failure is often called scuffing. The phenomenon of scuffing has been known for ...

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  • VanderZee, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-05)
    The objective of the work presented in this paper is the development of a transient model of a mobile air conditioning condenser. Refmement of a steady state model is an intermediate task that is especially important for ...

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  • Smith, S.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-05)
    The objectives of this study were to develop semi-theoretical steady state and transient models of a mobile air conditioning evaporator for use in a complete system simulation. The steady state evaporator heat transfer ...

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  • Laleman, M.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-05)
    This thesis examines the modes of energy loss incurred when the door of a refrigerator is opened. An analysis is done on the fresh food compartment of a 20 cu. ft. refrigerator unit, which is instrumented with aluminum ...

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  • Solberg, J.R.; Miller, N.R.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-02)
    A traditional method of controlling evaporator superheat in a vapor compression air conditioning system is the thermostatic expansion valve (TXV). Such systems are often used in automotive applications. The TXV depends ...

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