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Predrag S. Hrnjak
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Proceedings Papers

Effects of Distribution in Headers of Microchannel Evaporators on Transcritical CO 2 Heat Pump Performance

Andrew C. Beaver, Predrag S. Hrnjak, Jian M. Yin, Clark W. Bullard
Proc. ASME. IMECE2000, Advanced Energy Systems, 55-64, November 5–10, 2000
Paper No: IMECE2000-1296
https://doi.org/10.1115/IMECE2000-1296
View Paper titled, Effects of Distribution in Headers of Microchannel Evaporators on Transcritical CO 2 Heat Pump Performance
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Topics: Carbon dioxide, Heat pumps, Microchannels, Refrigerants, Air conditioners, Cycles, Flow (Dynamics)
Proceedings Papers

Thermodynamic Analysis of the Transition Between Slug and Annular Flow in Minichannels

Dolaana M. Khovalyg, Predrag S. Hrnjak, Anthony M. Jacobi
Proc. ASME. ICNMM2015, ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels, V001T04A065, July 6–9, 2015
Paper No: ICNMM2015-48555
https://doi.org/10.1115/ICNMM2015-48555
View Paper titled, Thermodynamic Analysis of the Transition Between Slug and Annular Flow in Minichannels
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Topics: Flow (Dynamics), Slug flows, Two-phase flow, Boiling, Equilibrium (Physics), Fluids, Heat exchangers, Heat transfer, Microchannels, Optimization
Proceedings Papers

Interactions Between Parallel Minichannels During Flow Boiling of R134A

Dolaana M. Khovalyg, Predrag S. Hrnjak, Aleksandr V. Baranenko, Anthony M. Jacobi
Proc. ASME. ICNMM2014, ASME 2014 12th International Conference on Nanochannels, Microchannels and Minichannels, V001T04A006, August 3–7, 2014
Paper No: ICNMM2014-22246
https://doi.org/10.1115/ICNMM2014-22246
View Paper titled, Interactions Between Parallel Minichannels During Flow Boiling of R134A
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Topics: Boiling, Flow (Dynamics), Pressure drop, Heat flux, Dynamics (Mechanics), Flow visualization, Fluctuations (Physics), Heat, Oscillations, Transients (Dynamics)
Proceedings Papers

Two-Phase Refrigerant Maldistribution in the Vertical Header and its Effect on the Heat Exchanger Performance as Evaporator in Heat Pump Mode

Yang Zou, Hanfei Tuo, Predrag S. Hrnjak
Proc. ASME. IMECE2012, Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D, 1823-1832, November 9–15, 2012
Paper No: IMECE2012-89578
https://doi.org/10.1115/IMECE2012-89578
View Paper titled, Two-Phase Refrigerant Maldistribution in the Vertical Header and its Effect on the Heat Exchanger Performance as Evaporator in Heat Pump Mode
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Topics: Heat exchangers, Heat pumps, Refrigerants, Microchannels, Flow (Dynamics), Air conditioning, Condensers (steam plant), Momentum, Simulation results
Journal Articles

Effect of Return Bend and Entrance on Heat Transfer in Thermally Developing Laminar Flow in Round Pipes of Some Heat Transfer Fluids With High Prandtl Numbers

Predrag S. Hrnjak, S. H. Hong
Journal: Journal of Heat Transfer
Article Type: Research Papers
J. Heat Transfer. June 2010, 132(6): 061701.
https://doi.org/10.1115/1.4000704
Published Online: March 19, 2010
View Article titled, Effect of Return Bend and Entrance on Heat Transfer in Thermally Developing Laminar Flow in Round Pipes of Some Heat Transfer Fluids With High Prandtl Numbers
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Topics: Flow (Dynamics), Fluids, Heat exchangers, Heat transfer, Laminar flow, Potassium, Refrigerants, Temperature, Pipes, Heat transfer coefficients
Proceedings Papers

Using Change Point Analysis for Image Processing of Developing Adiabatic Two-Phase Flow After Expansion Valve

Chad D. Bowers, Predrag S. Hrnjak
Proc. ASME. FEDSM2007, Volume 2: Fora, Parts A and B, 169-174, July 30–August 2, 2007
Paper No: FEDSM2007-37633
https://doi.org/10.1115/FEDSM2007-37633
View Paper titled, Using Change Point Analysis for Image Processing of Developing Adiabatic Two-Phase Flow After Expansion Valve
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Topics: Image processing, Two-phase flow, Valves, Flow (Dynamics), Flow visualization, Fluids, Refrigerants, Separation (Technology), Transparency, Vapors
Proceedings Papers

Online Measurement Techniques for Determining Oil Circulation Rate

Scott S. Wujek, Predrag S. Hrnjak, Christopher J. Seeton
Proc. ASME. FEDSM2007, Volume 2: Fora, Parts A and B, 181-186, July 30–August 2, 2007
Paper No: FEDSM2007-37640
https://doi.org/10.1115/FEDSM2007-37640
View Paper titled, Online Measurement Techniques for Determining Oil Circulation Rate
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Topics: Accuracy and precision, Air conditioners, Air conditioning, Compression, Compressors, Condensers (steam plant), Density, Design, Enthalpy, Flow (Dynamics)
Journal Articles

Condensation Heat Transfer of Carbon Dioxide Inside Horizontal Smooth and Microfin Tubes at Low Temperatures

Yoon Jo Kim, Jeremy Jang, Predrag S. Hrnjak, Min Soo Kim
Journal: Journal of Heat Transfer
Article Type: Research Papers
J. Heat Transfer. February 2009, 131(2): 021501.
https://doi.org/10.1115/1.2993139
Published Online: December 11, 2008
View Article titled, Condensation Heat Transfer of Carbon Dioxide Inside Horizontal Smooth and Microfin Tubes at Low Temperatures
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Topics: Carbon dioxide, Condensation, Flow (Dynamics), Heat transfer, Heat transfer coefficients, Low temperature, Temperature, Refrigerants, Vapors
Journal Articles

Adiabatic Horizontal and Vertical Pressure Drop of Carbon Dioxide Inside Smooth and Microfin Tubes at Low Temperatures

Yoon Jo Kim, Jeremy Jang, Predrag S. Hrnjak, Min Soo Kim
Journal: Journal of Heat Transfer
Article Type: Research Papers
J. Heat Transfer. November 2008, 130(11): 111001.
https://doi.org/10.1115/1.2957595
Published Online: September 3, 2008
View Article titled, Adiabatic Horizontal and Vertical Pressure Drop of Carbon Dioxide Inside Smooth and Microfin Tubes at Low Temperatures
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Topics: Pressure drop