Browse Technical Reports - Air Conditioning and Refrigeration Center by Title

  • Kalluri, R.R.; Loth, E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-08)
    This objective of this work was an extensive study of the parameters that affect ambient entrainment in refrigerated air curtains used in medium temperature vertical multi-deck display cases. The purpose of this study ...

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  • Smotrys, M.L.; Dutton, J.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-06)
    The potential for heat transfer enhancement from the combination of spanwise and streamwise vorticity has been investigated using a vortex-enhanced interrupted fin (VEIF) array. The VEIF consists of a fin with two ...

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  • Heun, M.K.; Dunn, W.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-07)
    This study is the first to document the condensation heat transfer performance of small diameter, microchannel tubes in crossflow heat exchange, and this study provides the fIrSt systematic evaluation of the effect of ...

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  • Zeitlow, D.C.; Ragazzi, F.; Pederson, C.O. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-04)
    A steady-state computer simulation based on fundamental principles was developed to model air-cooled condensers. It consists of dividing the total condenser length into a few segments which are further divided into several ...

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  • Orth, L.A.; Pederson, C.O. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-09)

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  • Orth, L.A.; Zeitlow, D.C.; Pederson, C.O. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-04)
    Currently, the refrigerant inventory for vapor compression systems is determined using a costly trial and error procedure. An accurate computer model of the refrigerant in a system would reduce the time and expense ...

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  • Singh, G.M.; Rodarte, E.; Miller, N.R.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-04)
    A method is presented for predicting the noise generated by expansion devices throttling refrigerant, based on an existing standard model for predicting the noise downstream of large, industrial control valves throttling ...

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  • Hurlburt, E.T.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-02)
    This paper develops a liquid film symmetry correlation and a liquid [11m thickness distribution model for horizontal annular gas-liquid pipe flows. The symmetry correlation builds on the work of Williams et al. (1996). ...

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  • Jassim, E.W.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2005-07)
    Probabilistic two-phase flow map pressure drop and void fraction models are developed for 6-port microchannels in order to provide a more accurate and common means of predicting void fraction and pressure drop. The models ...

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  • Adams, D.C.; Hrnjak, P.S.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-12)
    Aluminum multi-port microchannels are currently utilized in automotive air conditioners for refrigerant condensation. In general, research activities are directed towards developing other air conditioning and refrigerat ...

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  • Souza, A.L.; Chato, J.C.; Jabardo, J.M.S.; Wattelet, J.P.; Panek, J.S.; Christoffersen, B.; Rhines, N. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-10)
    A single tube evaporator test facility capable of measuring pressure drop and heat transfer coefficients inside horizontal tubes has been designed and developed at the Air Conditioning and Refrigeration Center at the ...

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  • Jassim, E.W.; Newell, T.A.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-08)
    The purpose of this investigation is to develop models for two-phase heat transfer, void fraction, and pressure drop, three key design parameters, in single, smooth, horizontal tubes using a common probabilistic two-phase flow ...

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  • 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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  • 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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