Browse by Author "Bullard, C.W."

  • 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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  • 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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  • Kim, M.H.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-03)
    A simple semi-empirical model for small rolling-piston-type rotary compressors using the most potential alternative refrigerants R-410A and R-407C including R-22 has been developed based on thermodynamic principles 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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