Predrag Stojan Hrnjak

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Research Output

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Conference article
2019

Characterization of wire mesh structure for coalescing oil separation

Xu, J. & Hrnjak, P., Sep 3 2019, In : IOP Conference Series: Materials Science and Engineering. 604, 1, 012037.

Research output: Contribution to journalConference article

Open Access

Numerical simulation of two-phase flow in the second header of MAC condenser

Li, J. & Hrnjak, P., Apr 2 2019, In : SAE Technical Papers. 2019-April, April

Research output: Contribution to journalConference article

Open Access

Wavy plates as impinging oil separating structure at compressor discharge

Xu, J. & Hrnjak, P., Sep 3 2019, In : IOP Conference Series: Materials Science and Engineering. 604, 1, 012031.

Research output: Contribution to journalConference article

Open Access
2018

Performance Characteristics of a Mobile Heat Pump System at Low Ambient Temperature

Feng, L. & Hrnjak, P., Jan 1 2018, In : SAE Technical Papers. 2018-April

Research output: Contribution to journalConference article

2017

Experimentally Validated Effects of Separation of Liquid and Vapor on Performance of Condenser and System

Li, J., Feng, L. & Hrnjak, P. S., Mar 28 2017, In : SAE Technical Papers. 2017-March, March

Research output: Contribution to journalConference article

Oil flow at the scroll compressor discharge: Visualization and CFD simulation

Xu, J. & Hrnjak, P., Sep 6 2017, In : IOP Conference Series: Materials Science and Engineering. 232, 1, 012051.

Research output: Contribution to journalConference article

Refrigerant Charge Imbalance in a Mobile Reversible Air Conditioning-Heat Pump System

Feng, L. & Hrnjak, P. S., Mar 28 2017, In : SAE Technical Papers. 2017-March, March

Research output: Contribution to journalConference article

2016

Refrigerant-Oil Flow at the Compressor Discharge

Xu, J. & Hrnjak, P., Apr 5 2016, In : SAE Technical Papers. 2016-April, April

Research output: Contribution to journalConference article

The Analysis of Phase Separation in Vertical Headers of Microchannel HEs

Li, J. & Hrnjak, P. S., Apr 5 2016, In : SAE Technical Papers. 2016-April, April

Research output: Contribution to journalConference article

2015

Effect of Pressure Drop in the Header on Refrigerant Distribution in an Outdoor Reversible Microchannel Heat Exchanger

Zou, Y. & Hrnjak, P., Apr 14 2015, In : SAE Technical Papers. 2015-April, April

Research output: Contribution to journalConference article

Phase Separation in Second Header of MAC Condenser

Li, J. & Hrnjak, P., Apr 14 2015, In : SAE Technical Papers. 2015-April, April

Research output: Contribution to journalConference article

2014

Lubricant effect on performance of R134a MAC microchannel evaporators

Li, H. & Hrnjak, P., Jan 1 2014, In : SAE Technical Papers. 1

Research output: Contribution to journalConference article

Lubricant impact on R134a distribution and microchannel heat exchanger performance

Zou, Y., Li, H. & Hrnjak, P., Jan 1 2014, In : SAE Technical Papers. 1

Research output: Contribution to journalConference article

2013

Effect of lubricant on two-phase refrigerant distribution in microchannel evaporator

Li, H. & Hrnjak, P. S., Jan 1 2013, In : SAE Technical Papers. 2

Research output: Contribution to journalConference article

2012

Experimentally validated model of refrigerant distribution in a parallel microchannel evaporator

Tuo, H., Bielskus, A. & Hrnjak, P. S., Jan 1 2012, In : SAE Technical Papers.

Research output: Contribution to journalConference article

2011

Effect of flash gas bypass on the performance of R134A mobile air-conditioning system with microchannel evaporator

Tuo, H., Bielskus, A. & Hrnjak, P., Jan 1 2011, In : SAE Technical Papers.

Research output: Contribution to journalConference article

Evaluation of transient refrigerant migration modeling approach on automotive air conditioning systems

Li, B., Peuker, S., Hrnjak, P. & Alleyne, A., Jan 1 2011, In : SAE Technical Papers.

Research output: Contribution to journalConference article

2010

Effects of oil and saturation temperature on developing two-phase flow of R134a in an air-conditioning system

Bowers, C. & Hrnjak, P., Dec 1 2010, In : ASHRAE Transactions. 116, PART 2, p. 290-299 10 p.

Research output: Contribution to journalConference article

2005

Air-side thermal-hydraulic performance of louvered-fin, flat-tube heat exchangers with sequential frost-growth cycles

Xia, Y., Hrnjak, P. S. & Jacobi, A. M., Nov 16 2005, In : ASHRAE Transactions. 111 PART 1, p. 487-495 9 p., OR-05-1-2.

Research output: Contribution to journalConference article

Clutch cycling mode of compressor capacity control of transcritical R744 systems compared to R134a systems

McEnaney, R. & Hrnjak, P., Jan 1 2005, In : SAE Technical Papers.

Research output: Contribution to journalConference article

Using R744 (CO2) to cool an up-armored M1114 HMMWV

Memory, S., Yin, J. M., Collier, S., Gunter, M., Hrnjak, P., Peuker, S., Elber, S., Manzione, J., Schultz, N. & Dolney, J., Jan 1 2005, In : SAE Technical Papers.

Research output: Contribution to journalConference article

2004

Flow distribution issues in parallel flow heat exchangers

Hrnjak, P. S., May 28 2004, In : ASHRAE Transactions. 110 PART 1, p. 301-306 6 p.

Research output: Contribution to journalConference article

2003

Contribution of heat exchangers in improved performance of new generation automotive air-conditioning system with R-744

Giannavola, M., Yin, J., Bullard, C. & Hrnjak, P., Jul 23 2003, In : ASHRAE Transactions. 109 PART 1, p. 542-554 13 p.

Research output: Contribution to journalConference article

Pressure drop and visualization of R-134a two-phase flow in a rectangular microchannel

Tu, X. & Hrnjak, P. S., Jul 24 2003, In : ASHRAE Transactions. 109 PART 1, p. 703-710 8 p.

Research output: Contribution to journalConference article

2002

A control-oriented model of transcritical air-conditioning system dynamics

Rasmussen, B., Musser, A., Alleyne, A., Bullard, C., Hrnjak, P. & Miller, N., Jan 1 2002, In : SAE Technical Papers.

Research output: Contribution to journalConference article

Compact counterflow gas cooler for R-744

Bullard, C. W., Yin, J. M., Hrnjak, P. S. & Heidenreich, M., Jan 1 2002, In : ASHRAE Transactions. 108 PART 1, p. 487-491 5 p.

Research output: Contribution to journalConference article

Control-oriented modeling and analysis of automotive transcritical AC system dynamics

Rasmussen, B., Alleyne, A., Bullard, C., Hrnjak, P. & Miller, N., Jan 1 2002, In : Proceedings of the American Control Conference. 4, p. 3111-3116 6 p.

Research output: Contribution to journalConference article

Flow of refrigerant 134a through orifice tubes

Singh, G. M., Hrnjak, P. S. & Bullard, C. W., Jan 1 2002, In : ASHRAE Transactions. 108 PART 1, 1 p.

Research output: Contribution to journalConference article

Frost deposition and refrigerant distribution in microchannel heat exchangers

Song, S., Bullard, C. W. & Hrnjak, P. S., Jan 1 2002, In : ASHRAE Transactions. 108 PART 2, p. 944-953 10 p.

Research output: Contribution to journalConference article

Visualization of the effects of spiral angle on the enhancement of in-tube flow boiling in microfin tubes: Discussion

Mathur, G. D. & Hrnjak, P., Jan 1 2002, In : ASHRAE Transactions. 108 PART 2, 1 p.

Research output: Contribution to journalConference article

2001

Contribution of internal heat exchanger to transcritical R-744 cycle performance

Boewe, D. E., Bullard, C. W., Yin, J. M. & Hrnjak, P. S., Dec 1 2001, In : ASHRAE Transactions. 107 PART 2, p. 189-203 15 p.

Research output: Contribution to journalConference article

Defrost issues in indirectly refrigerated display cases

Hrnjak, P. S., Mao, Y., Elovitz, K. & Behr, J., 2001, In : ASHRAE Transactions. 107 PART 2, p. 466-472 7 p.

Research output: Contribution to journalConference article

Heat transfer and pressure drop of gas coolers

Fang, X., Bullard, C. W. & Hrnjak, P. S., Jan 1 2001, In : ASHRAE Transactions. 107 PART. 1, p. 255-266 12 p.

Research output: Contribution to journalConference article

Modeling and analysis of gas coolers

Fang, X., Bullard, C. W. & Hrnjak, P. S., Jan 1 2001, In : ASHRAE Transactions. 107 PART. 1, p. 4-13 10 p.

Research output: Contribution to journalConference article

2000

Methods for detection of lubrication failure applied to a swashplate compressor

Drozdek, J., Chappell, J., Cusano, C., Hrnjak, P., Miller, N. & Newell, T., 2000, In : SAE Technical Papers.

Research output: Contribution to journalConference article

1999

Performance of the prototype of a transcritical R744 mobile A/C system

McEnaney, R. P., Park, Y. C., Yin, J. M. & Hrnjak, P. S., Jan 1 1999, In : SAE Technical Papers.

Research output: Contribution to journalConference article

Steady state and cycling performance of a typical R134a mobile A/C system

Park, Y. C., McEnaney, R., Boewe, D., Yin, J. M. & Hrnjak, P. S., Jan 1 1999, In : SAE Technical Papers.

Research output: Contribution to journalConference article

The role of suction line heat exchanger in transcritical R744 Mobile A/C systems

Boewe, D., Yin, J., Park, Y. C., Bullard, C. W. & Hrnjak, P. S., Jan 1 1999, In : SAE Technical Papers.

Research output: Contribution to journalConference article