Browse by Author "Bullard, C.W."

  • Carlson, D.M.; Hrnjak, P.S.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-06)
    Frost deposition across a typical eight-row deep refrigeration display case heat exchanger was studied under varying conditions of face velocity, refrigerant temperature glide, and absolute humidity. The heat exchanger, ...

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  • Peixoto, R.A.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-02)

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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., 2002-10)
    A simulation model for predicting the performance of a display case under frosting conditions has been developed. An experimentally validated heat exchanger simulation model for a secondary refrigerant was extended to ...

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  • Kulkarni, T.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-02)
    The present work is based on theoretical and computational investigations into microchannel heat exchangers. Microchannel heat exchangers have long been used as condensers but concerns regarding refrigerant maldistribution ...

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  • Uribe, T.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-12)
    The purpose of this project is to explore the system design implications of compressor rapid cycling. An earlier project yielded promising results for a typical 2-ton residential split system. It showed that cycle periods ...

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  • Bullard, C.W.; Davidson, I.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-09)
    This report analyzes a broad spectrum of strategies for actively or passively controlling the inlet state of fixed-geometry expansion devices such as capillary and orifice tubes, to match compressor mass flow rates ...

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  • Mullen, C.E.; Bridges, B.D.; Porter, K.J.; Hahn, G.W.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-04)
    Component submodels for a room air conditioner computer simulation were developed and validated using data from a 1.5-ton room air conditioner. The room air conditioner was tested over an extremely wide range: both indoor ...

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  • Woodall, R.J.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-06)
    This report describes the further development and validation of the Refrigerator/Freezer Simulation (RFSIM) model. The reports also describes the first major application of the model as an analysis tool for new refrigerator ...

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  • Kelman, S.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-01)
    The primary focus of this thesis is on performance advantages of a dual-temperature evaporator refrigerator system over a conventional design. Through extensive use of computer-aided modeling, it is demonstrated that ...

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  • Shah, R.; Alleyne, Andrew G.; Bullard, C.W.; Rasmussen, Bryan P.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-08)
    The focus of this research is on the development of a dynamic modeling capability for subcritical vapor compression systems with one or more evaporators. The modeling methodology is developed with the multiple objectives ...

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  • 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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  • 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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  • 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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  • 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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  • 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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  • Song, S.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-03)
    Microchannel condensers have dominated the automotive a/c market by maximizing performance for a fixed size and weight, but must operate as evaporators if they are to be used in heat pumps. This report presents a microchannel ...

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  • Liu, Y; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-01)
    This report describes the complete process of testing capillary tube-suction line heat exchangers (CfSLHX). and presents preliminary data for non-adiabatic flow of R-134a in the capillary tube, as well as the comparison ...

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  • 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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