Browse by Author "Jacobi, A.M."

  • Zeller, S.E.; Weaver, R.L.; Dutton, J.C.; Jacobi, A.M.; Balachandar, S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-04)
    Project 84 concentrated on understanding the noise generating mechanisms of axial-flow fans with the intent of proposing methods of component design and system assembly by which noise generation is reduced or minimized. ...

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  • DeJong, N.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-01)
    In many compact heat exchanger applications, interrupted-fin surfaces are used to enhance air-side heat transfer performance. One of the most common interrupted surfaces is the louvered fin. The goal of this work is to ...

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  • Storey, B.D.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-07)
    An experimental study of frost growth under the influence of streamwise vortices in a laminar channel flow is presented. A new model of frost growth is developed to normalize the growth rate of frost with respect to the ...

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  • Shelton, J.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-03)

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  • Felton, K.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-09)
    Experiments to assess the heat transfer and pressure-drop effects of delta-wing vortex generators placed at the entrance of developing channel flows are reported in this study. The experimental geometry simulates common ...

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  • Gentry, M.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-07)

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  • Gentry, M.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1998-03)
    Single-phase convective heat transfer can be enhanced by modifying the heat transfer surface to passively generate streamwise vortices. The swirling flow of the vortices modifies the temperature field, thinning the thermal ...

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  • Hoke, J.L.; Georgiadis, J.G.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-11)
    Microscopic observations of frost deposition on a variety of substrates having different contact angles, (polytetrafluoroethylene PTFE, kapton, glass and others) allow the quantification of substrate effects on frost ...

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  • Hu, X.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-05)
    Horizontal-tube falling-film heat exchangers enjoy wide application because they offer superior thermal performance and operate with less fluid charge than conventional shell-and-tube or flooded heat exchangers. Recent ...

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  • Kearney, S.P.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-01)
    Finned tube heat exchangers are important because of their direct impact on energy and material use in petrochemical, power, transportation, and HV AC/R systems. The design of effective heat exchangers has direct social, ...

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  • El Sherbini, A.I.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-02)
    Water usually condenses on the air-side surfaces of evaporators in air-conditioning and refrigeration applications. The accumulating condensate on a heat exchanger significantly affects its thermal and hydraulic performance. ...

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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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  • 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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  • Robinson, C.M.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-08)
    Frost growth on heat exchanger surfaces in refrigeration and air conditioning systems has posed a challenge to heat transfer engineers for decades. Frost buildup causes an increase in the airside pressure drop and ...

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  • Bull, B.R.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-05)
    The effect of longitudinal vortex generation on heat transfer is evaluated for a full scale plain fin-and-tube compact heat exchanger operating in both dry and wet conditions. The heat exchanger tested is comparable to ...

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  • Lenger, M.J.; Jacobi, A.M.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1998-07)
    In some refrigeration applications, difficulties arise in establishing stable evaporator operating conditions, especially when using a thermostatic expansion valve. The unstable superheat signal, sometimes called hunting, ...

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  • Brutz, J.M.; Dutton, J.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2005-06)
    Improved heat exchanger performance is extremely important in air-conditioning and refrigeration systems, since it can lead directly to volume, weight, energy, and cost savings. The air-side heat transfer coefficient is ...

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  • Sommers, A.D.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2007-08)
    A method is described for fabricating controlled micro-scale, topographical features on aluminum surfaces for the purpose of exploiting those features to affect the surface wettability. Using a photolithographic approach, ...

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  • Burton, C.M.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-05)
    Vapor-liquid equilibria (VLE) data were obtained over a wide range of mixture composition and saturation conditions for difluoromethane (R-32) mixed with a polyol ester oil (POE). These data were correlated using the ...

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  • Sommers, A.D.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-12)
    Longitudinal vortex generation is a technique for enhancing heat transfer and can be accomplished by placing small flow manipulators on the fin surface of a heat exchanger. This technique is of particular benefit ...

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