Browse Technical Reports - Air Conditioning and Refrigeration Center by Title

  • 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., 1999-07)

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  • Stone, K.; Vanka, S.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-08)
    Developing flow in a wavy passage is analyzed using an accurate numerical scheme to solve the unsteady flow equations. Calculations are presented for a channel consisting of 14 waves. Systematic time-dependent simulations ...

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  • Stone, K.M.; Vanka, S.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-02)
    Developing flow and heat transfer in a wavy passage are analyzed using an accurate numerical scheme that solves the unsteady flow and energy equations. Calculations are presented for two different wavy channels, each ...

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  • Zhang, L.W.; Balachandar, S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-08)
    An accurate computational method for the calculations of flow and heat transfer in compact heat exchangers is developed in collaboration with the National Center for Supercomputing Applications. In this method, the ...

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  • Stone, K.M.; Vanka, S.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-05)
    Flow and heat transfer in a wavy passage are analyzed using an accurate numerical scheme that solves the two-dimensional unsteady flow and energy equations, for both developing and periodically fully-developed flow ...

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  • Zhang, L.; Balachandar, S.; Najjar, F.M.; Tafti, D.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-10)
    The heat transfer enhancement mechanisms and the performance of parallel-plate-fin heat exchangers are studied numerically by solving the unsteady two-dimensional Navier Stokes and energy equations. Different fm arrangements ...

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  • Geil, P.H.; Rybnikar, F. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-10)

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  • Hurlburt, E.T.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-09)
    Two optical techniques are described for measurement of a liquid film's surface. Both techniques make use of the total internal reflection which occurs at a liquid-vapor interface due to the refractive index difference ...

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  • Dobson, M.K.; Wattelet, J.P.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-06)

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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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  • Kirshbaum, D.J.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-06)
    A Microsoft Excel spreadsheet program developed previously at ACRC to optimize condenser size with respect to surface area has been modified. A new method of modeling pipe bends has been developed incorporating a new ...

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  • 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, Matthew Kuperus; 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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