Browse Technical Reports - Air Conditioning and Refrigeration Center by Subject "heat exchangers"

  • Xia, Y.; Hrnjak, P.S.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-12)
    The thermal-hydraulic behavior of folded-louvered-fin, microchannel heat exchangers is explored under conditions of air-side frosting, defrosting, and refrosting. The temperature distribution within a two-dimensional composite ...

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  • Pourmohamadian, N.; Philpott, Michael L.; Shannon, Mark A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-08)
    Non-metallic, flexible, thin, microchannel heat exchangers made from heat-sealable polyimide films have recently been developed for refrigeration and air-conditioning applications. In order for these heat exchangers ...

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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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  • 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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  • Monroe, C.A.; Newell, T.A.; Chato, J.C. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-04)
    Pressure drop and heat transfer measurements were taken for smooth and internally enhanced aluminum microchannels using pure R134a. Adiabatic, evaporation, and condensation tests were conducted in the horizontally-oriented ...

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  • Goslovich, K.S.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-05)
    The goal of this study was to determine whether extruded aluminum tubing could be used in the manufacture of a condenser and evaporator for a domestic refrigerator that would be competitive with conventional technology. ...

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  • Davidson, I.E.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-10)
    This project extends analysis of heat exchanger design tradeoffs in response to two emerging trends: 1) demands for increasing thermal performance while reducing material costs are beginning to raise structural issues; and ...

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  • Reeves, R.N. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-01)
    This paper examines a set of simple equations describing a domestic refrigerator/freezer system and suggests several modeling improvements, based on experimental results. The experimental setup is described and limitations ...

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  • Liu, X.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-03)
    A general framework is proposed for simulating complex heat exchanger geometries in a manner suitable for sequential solution of the refrigerant- and air-side equations for mass, momentum and energy. The sequential solution ...

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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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  • 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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