Recent Additions

• Two-Phase Pressure Drop and Flow Regime of Refrigerants and Refrigerant-Oil Mixtures in Small Channels 

  Field, B.S.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2007-09)

  As microchannel heat exchangers have become more sophisticated in their design, more exact understanding of the flow inside them is necessary. A decrease in diameter enhances the heat transfer (which takes place at the ...

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• Using Anisotropic Micro-Scale Topography to Manipulate the Wettability of Aluminum and Reduce the Retention of Water 

  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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• Integrating HVAC Equipment with Other Building Subsystems 

  Yannayon, B.; Bullard, C.W. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2007-05)

  Data now becoming available from prototype low energy residences confirm that peak heating and cooling loads can be reduced by factors of 3 to 5, using currently available technologies. This paper explores the range ...

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• Carbon Dioxide and R410a Flow Boiling Heat Transfer, Pressure Drop, and Flow Pattern in Horizontal Tubes at Low Temperatures 

  Park, C.Y.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2007-01)

  Carbon dioxide (CO2) has been seriously considered as an alternate refrigerant for HCFC and HFC fluids, due to the increasing interest of environmentally safe refrigerants in air-conditioning and refrigeration systems. ...

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• Experimental Investigation of an Environmental Control Unit Utilizing Carbon Dioxide for Heating and Cooling 

  Wujek, S.S.; Hrnjak, P.S. (Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign., 2006-12)

  This report details the tests performed on R22 box and R744 breadboard versions of the US Army Environmental Control Unit (ECU) with a nominal cooling capacity of 9,000 BTU/hr (0.75 Tons or 2.64 kW). An R22 ECU box ...

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