Browse Technical Reports - Air Conditioning and Refrigeration Center by Subject "louvered-fin 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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  • Zhang, X.; Tafti, D.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-04)
    The study classifies and isolates the effects of thermal wake interference that occurs in multilouvered fins. Inter-fin interference occurs between adjacent rows of louvers and is dominant at high flow efficiencies when ...

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  • Zhang, X.; Tafti, D.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-04)

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  • DeJong, N.C.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-10)
    The efficiency of heat exchangers is important in the HV ACIR industry. Driven by high energy standards and increasing competition, manufacturers are seeking to decrease air-side resistance in heat exchangers by increasing ...

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  • Zhang, X.; Tafti, D.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-04)
    The paper studies the effect of Reynolds number, fin pitch, louver thickness, and louver angle on flow efficiency in multi-louvered fins. Results show that flow efficiency is strongly dependent on geometrical parameters ...

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  • Bellows, K.D. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-07)
    This study involves visualization of the flow through louvered fins Jor automotive heat exchangers. Stereolithography scale models (10.5: 1) of the louvered fins are used with dye-in-water injection to observe the flow. ...

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  • Tafti, D.K.; Zhang, X. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-08)
    The effect of fin pitch, louver angle and thickness, and flow depth on the onset, propagation, and characteristic frequencies of instabilities in multilouvered fins is investigated. The initial instability appears in the ...

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  • Zhang, L.W.; Balachandar, S.; Tafti, D.K.; Najjar, F.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-04)
    The heat transfer enhancement mechanisms and the performance of parallel-plate-fin heat exchangers are studied using large scale direct numerical simulation. Geometry effects such as finite fin thickness and fin arrangements ...

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  • Tafti, D.K.; Zhang, X.; Huang, W.; Wang, G. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-04)
    The paper describes the computational procedure and results from large-eddy simulations in a complex three-dimensional louver geometry. The three-dimensionality in the louver geometry occurs along the height of the fin, ...

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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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  • 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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  • Tafti, D.K.; Zhang, X.; Guo, D. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-05)

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  • Tafti, D.K.; Zhang, L.W.; Najjar, F.M.; Balachandar, S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1995-12)

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