Browse Technical Reports - Air Conditioning and Refrigeration Center by Title

  • 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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  • Verma, P.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-06)
    Factors affecting frost distribution are explored using a finite element model, developed and validated using a full-scale 8-row heat exchanger in a wind tunnel. The heat exchanger is typical of the type used in ...

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  • Jain, G.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-10)
    Issues involved in the solution of thermal system problems within a Newton-Raphson framework have been addressed. The physical limitations of Newton-Raphson variables and limited range of thermodynamic property calculation ...

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  • Bridges, B.D. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-07)
    A room air conditioner simulation model has been developed, and validated experimentally. This report describes the assumptions made in the governing equations along with the process used to estimate a few empirical ...

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  • Sheiretov, T.K.; Van Glabbeek, W.; Cusano, C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-12)

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  • Thompkins, D.M.; Newell, T.A.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-12)
    In Chapter 1, an experimental investigation of single phase fluid distribution through an array of microchannel discharge tubes was conducted. Span-wise pressure profiles were also obtained. The working fluids were air ...

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  • Parker, S.J.; Balachandar, S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-08)
    The primary purpose of this study was to develop an understanding of the stability of laminar flow through bluff body arrays, and investigate the nature of the unsteady vortex shedding regime that follows. The flow was ...

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  • Staley, D.M.; Bullard, C.W.; Crawford, R.R. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-06)
    This paper develops a steady-state system design model for a standard 18 ft3 refrigerator/freezer. Models for the compressor, condenser, evaporator, and suction line interchanger are considered. Experimental data for both ...

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  • Knackstedt, L.N. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-01)
    As the DOE standards for energy usage become increasingly more strict, and refrigerator manufacturers seek to further improve refrigerator efficiency, door openings will become a significant portion of the equation which ...

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  • Smith, M.K.; Wattelet, J.P.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-01)
    An average R12 refrigerant correlation has been developed for the mass flux range of 25-100 kg/m2-s and the heat flux range of 2-10 kW/m2. Refrigerant mixtures of 80% R22/lO% R141b and 65% R22/35% R123 have also been ...

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  • Robinson, C.M.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-08)
    Frost growth on heat exchanger surfaces in refrigeration and air conditioning systems has posed a challenge to heat transfer engineers for decades. Frost buildup causes an increase in the airside pressure drop and ...

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  • Tafti, D.K.; Zhang, X.; Guo, D. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-05)

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  • Tran, C.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-06)
    Void fractions and pressure drops were measured for R134a and R410A for a return bend test section consisting of three return bends of tube diameter 8.28 mm (0.326") and center-to-center distances of 25.4 mm (1.00"). The ...

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  • Bull, B.R.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-05)
    The effect of longitudinal vortex generation on heat transfer is evaluated for a full scale plain fin-and-tube compact heat exchanger operating in both dry and wet conditions. The heat exchanger tested is comparable to ...

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  • Malik, T.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2005-03)
    The project compares the non-metallic/polymer heat exchangers to the current technology in metallic heat exchangers. A review of state of the art of polymer heat exchangers is presented and technological problems ...

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