Browse Air Conditioning and Refrigeration Center (ACRC) by Title

  • Mina, E.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2004-09)
    Separately dealing with the latent load, the load associated with moisture content in air, in air conditioning applications can lead to better efficiencies and better control of the indoor environment. This research studies ...

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  • Hu, Xiaolan; 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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  • Carlson, D.M.; Hrnjak, P.S.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2001-06)
    Frost deposition across a typical eight-row deep refrigeration display case heat exchanger was studied under varying conditions of face velocity, refrigerant temperature glide, and absolute humidity. The heat exchanger, ...

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  • Andres, D.J. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-09)
    Microchannel tubing is a relatively new heat-exchanger technology which involves internal heat transfer enhancements. Although microchannel technology offers tremendous design flexibility, it is not well understood. As ...

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  • Luhrs, D.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-07)
    A test facility was built for the purpose of performing heat transfer studies on microchannel heat exchangers. The studies will involve condensation of refrigerant 134a inside the enhanced tubes,' although no condensation ...

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  • Weston, P.G. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1996-05)
    Compared to other air-conditioning and refrigeration systems, mobile air-conditioning systems are unique in the respect that they operate almost entirely under transient conditions. The major operating transients include: ...

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  • Peixoto, R.A.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-02)

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  • Johnson, M.F.G. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-09)
    This report describes the development of an experimental apparatus for testing small-bore diameter expansion devices or capillary tubes. Interest in basic refrigeration studies has increased due to the introduction of ...

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  • Feller, S.D. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-07)
    This document describes the design of the outdoor environmental chamber of a test facility for the collection of room air conditioner performance data over a wide range of psychrometric conditions. A key component of ...

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  • Fleming, J.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1993-07)
    This report summarizes the process of designing the calorimeter chamber of a test facility for assessing the steady-state energy efficiency of room air conditioners. The calorimeter has been designed to produce accurate ...

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  • Verma, P.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2002-10)
    A simulation model for predicting the performance of a display case under frosting conditions has been developed. An experimentally validated heat exchanger simulation model for a secondary refrigerant was extended to ...

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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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  • Wattelet, J.P. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1990-08)
    Chlorofluorocarbons are the primary refrigerants used in vapor-compression air conditioning and refrigeration systems. Environmental concerns, such as the ozone depletion effect of chlorofluorocarbons, have led to an ...

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  • Rugg, S.M. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1994-07)
    This report discusses the design, testing and validation of a room air conditioner test facility. The facility is designed to test the performance of air conditioners rated from 0.5 to 2.5 tons of refrigeration over a ...

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  • Uribe, T.; Bullard, C.W.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-12)
    The purpose of this project is to explore the system design implications of compressor rapid cycling. An earlier project yielded promising results for a typical 2-ton residential split system. It showed that cycle periods ...

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  • Bullard, C.W.; Davidson, I.E. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-09)
    This report analyzes a broad spectrum of strategies for actively or passively controlling the inlet state of fixed-geometry expansion devices such as capillary and orifice tubes, to match compressor mass flow rates ...

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  • Aviles, E.A.; Miller, N.R.; Newell, T.A. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2003-08)
    Frost growth is a major concern in many air conditioning and refrigeration systems. Frost buildup causes an increase in the airside pressure drop and thermal resistance of the evaporator, yielding a substantial decrease ...

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  • Mullen, C.E.; Bridges, B.D.; Porter, K.J.; Hahn, G.W.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1997-04)
    Component submodels for a room air conditioner computer simulation were developed and validated using data from a 1.5-ton room air conditioner. The room air conditioner was tested over an extremely wide range: both indoor ...

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  • Purvis, B.D. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1992-11)
    This report examines the phenomena of flashing fluid flow in small diameter tubes (on the order of 1 mm). Small diameter tubing is often used as the expansion device in refrigeration systems. Tubing used as a refrigeration ...

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  • Hemami, T.L. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 1998-09)
    A transient model was developed to predict the behavior of the vapor compression cycle of a mobile air-conditioning system. Mobile air-conditioning systems operate in a transient mode due to variations in compressor ...

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