Browse Technical Reports - Air Conditioning and Refrigeration Center by Author "Bullard, C.W."

  • Ge, H.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-09)
    A prototype refrigerator/freezer was fitted with a single evaporator, ducted so it could serve both compartments in a sequential manner. Two capillary tubes, one optimized for each compartment were attached to the suction ...

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  • Noonan, A.M.; Miller, N.R.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-08)
    A fault detection and diagnosis (FDD) method was used to detect and diagnose faults on both a refrigerator and an air conditioner during normal cycling operation. The objective of the method is to identify a set of sensors ...

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  • Goslovich, K.S.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-05)
    The goal of this study was to determine whether extruded aluminum tubing could be used in the manufacture of a condenser and evaporator for a domestic refrigerator that would be competitive with conventional technology. ...

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

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  • 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 ...

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  • 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 ...

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  • Dane, M.H.; Miller, N.R.; Alleyne, Andrew G.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-08)

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  • Barnes, P.R.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-08)
    A simulation model was developed to investigate strategies for reducing total equivalent warming impact (TEWI) in compact water chillers. The focus was on minimizing R-410A refrigerant charge while increasing efficiency. ...

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  • Porter, K.J.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-12)

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  • Liu, X.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-03)
    A general framework is proposed for simulating complex heat exchanger geometries in a manner suitable for sequential solution of the refrigerant- and air-side equations for mass, momentum and energy. The sequential solution ...

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  • Jain, S.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-09)
    Hydrocarbon refrigerants (HC's) are one alternative to hydrofluorocarbons (HFC’s) since they have zero ozone depletion potential and negligible global warming potential. However, due to their flammable nature, the amount ...

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  • Barnes, P.R.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-06)

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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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  • 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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  • 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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  • 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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  • 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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  • Srichai, P.R.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-07)
    A two-speed compressor was installed in a side-by-side refrigerator in order to validate simulation results which predicted significant increases in energy efficiency due to better load matching and reduced temperature ...

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