Browse Contract Reports - Air Conditioning and Refrigeration Center by Title

  • Hrnjak, P.S.; Miller, N.R.; Rodarte, E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-12)

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  • Fang, X. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-08)
    Fixed-area expansion devices are widely used in refrigerators, air-conditioners, and heat pumps of up to 3.5 kW capacity with variable operating conditions. A fixed-area expansion device falls into one of the three ...

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  • Park, Y.G.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-05)
    The air-side thermal-hydraulic performance of serpentine-fin, flat-tube heat exchangers is compared to that of conventional plate-fin, round-tube designs for various fin geometries and surface conditions. Heat exchanger ...

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  • Multerer, B.; Burton, R.L. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1991-07)

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  • Smith, M.K. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-11)
    Some Non-Azeotropic Refrigerant Mixtures (NARMs) have been identified as potential replacements for R12 because of their low ozone depletion potential, low global warming potential and promising thermodynamic characteristics ...

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  • Chandrasekharan, R.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-10)
    A model for simulating a display case evaporator under frosting conditions has been developed, using a quasi-steady and finite-volume approach and a Newton-Raphson based solution algorithm. It is capable of simulating ...

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  • Boewe, D.E.; McEnaney, R.P.; Park, Y.C.; Yin, J. M.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-07)

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  • Richter, M.R.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-06)
    In the first part of this report, experimental results are presented comparing a prototype R744 system with a commercially available R410A system in heating mode. When the heating capacity of the two systems is matched at ...

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  • Kim, G.J.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-01)
    Fin-and-tube heat exchangers are commonly used in air-conditioning systems and ,. improving the efficiency of this component is very important. For a fin-and-tube heat exchanger used as an evaporator, moisture from the ...

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  • Kaiser, J.M.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2000-07)
    The effect of condensate accumulation and shedding on the air-side thermal performance of automotive evaporator coils has been studied. Experiments under wet and dry conditions were conducted to expose the impact of ...

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  • Litch, A.D.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-08)

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  • Zilly, J.; Jang, J.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-03)
    Enhanced tubes have been commonly used in heat exchangers for 30 years. Modern micro-fin tubes play a significant role in high-efficiency refrigerators and air conditioners with their significantly enhanced heat ...

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  • Jang, J.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-06)

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  • Kulkarni, T.; Kim, M.H.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-06)

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  • Miller, N.R.; Hrnjak, P.S.; Rodarte, E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1998-11)

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  • Hu, X.; Jacobi, A.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-10)
    When a liquid film falls from one tube to another below it, the flow can take the form of discrete droplets, individual jets or a continuous sheet. Experiments exploring the effects of thermophysical properties and ...

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  • Gerlach, D.W.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-03)
    The performance of dual evaporator household refrigerators was studied experimentally and by numerical simulation. This study considers only serial connection where the refrigerant flows through the fresh food evaporator ...

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  • Ilic, S.M.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-12)
    Effects of compressor on/off cycle times shorter than typical a/c heat exchanger thermal time constant (~1 min) were examined as a method of cooling capacity regulation. Short compressor on/off cycle times enable the ...

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  • Yin, J.M.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-05)
    This document summarizes the evolution of the design of a 10 kW split system residential heat pump, to operate with R744 on the transcritical cycle. It is the first such prototype to be designed, and will be used for ...

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  • Terrell, Jr., W.J.; Mao, Y.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1999-04)

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