Predrag Stojan Hrnjak

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Research Output

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Conference contribution
2019

Analysis and quantification of generated bubbles for flow boiling through diabatic visualization

Yang, C. M. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1239-1245 7 p. 858. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Design and performance evaluation of an R744 multi-temperature refrigerated container

Lawrence, N., Elbel, S. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 3633-3640 8 p. 352. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Experimental investigations of the single-phase flow distribution in brazed plate heat exchangers and its impact on the heat exchanger

Li, W. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 2746-2753 8 p. 1564. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Flow patterns and pressure drop of vertical upward flows in a tube with header-like protrusions with R134a

Qian, H. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1223-1230 8 p. 844. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Flow patterns of some new low GWP refrigerants during evaporation in small tube

Li, H. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1491-1498 8 p. 1252. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Heat transfer and pressure drop model of in-tube condensation in a vapor-compression system

Xiao, J. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1150-1158 9 p. 812. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Heat transfer coefficient, pressure drop, and flow visualization for some new low GWP refrigerants during evaporation in small tube

Li, H. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1499-1506 8 p. 1255. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Modified flow pattern maps for flow boiling in horizontal micro-finned tubes considering the effect of helix angle

Yang, C. M. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1231-1238 8 p. 857. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Numerical simulation of phase separation in the second header of microchannel condenser

Li, J. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 2335-2342 8 p. 836. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Packaged ammonia refrigeration units continuously improve-How to measure and present performance?

Hrnjak, P., Jan 1 2019, 8th Conference on Ammonia and CO2 Refrigeration Technologies, Ohrid 2019 - Proceedings. International Institute of Refrigeration, p. 7-16 10 p. (Refrigeration Science and Technology; vol. 2019-April).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Performance characteristics of a residential air conditioning system with subcooling control

Kimura De Carvalho, B. Y. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 4018-4025 8 p. 1135. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Performance evaluation and strategies of subcooling control in residential heat pump systems

Kimura De Carvalho, B. Y. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 4037-4044 8 p. 1159. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Performance evaluation and validation of a novel heat pump water heater with rotary compressor and D-shaped condenser coils

Shi, C. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 4389-4398 10 p. 584. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Performance evaluation on heat pump water heater with drop-in refrigerant R1234yf and condenser size modification

Shi, C. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1813-1820 8 p. 1686. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Performance improvement of a residential heat pump water heater by modifying stratification of water temperature

Shi, C. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 4918-4925 8 p. 1791. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Pressure drop in large flattened-tube steam condensers

Davies, W. A. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1271-1278 8 p. 906. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Rational approach to refrigerant charge reduction

Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 29-40 12 p. 1832. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Signal analysis and mass measurement based calibration of capacitive sensors for void fraction and flow regimes in horizontal and vertical round tubes using R134a

Qian, H. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1207-1214 8 p. 839. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Steam condensation heat transfer coefficient in large, flattened-tube steam condensers

Davies, W. A. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1263-1270 8 p. 898. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Theoretical analysis of the end-plate effect on heat transfer in brazed plate heat exchangers

Li, W. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 2754-2761 8 p. 1565. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Visualization of two-phase flow through distributors and effect on performance of evaporators

Yao, Y., Konepudi, R. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1215-1222 8 p. 840. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Void fraction and flow regime of in-tube condensation in a vapor-compression system

Xiao, J. & Hrnjak, P., Jan 1 2019, ICR 2019 - 25th IIR International Congress of Refrigeration. Minea, V. (ed.). International Institute of Refrigeration, p. 1141-1149 9 p. 809. (Refrigeration Science and Technology; vol. 2019-August).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2018

Design and validation of a transcritical CO2 mobile refrigerated container system for military applications

Lawrence, N., Elbel, S. & Hrnjak, P., Jan 1 2018, 13th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerant Solutions for Warm Climate Countries, Proceedings. International Institute of Refrigeration, p. 882-890 9 p. (Refrigeration Science and Technology; vol. 2018-June).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Parametric study and improvement of phase separation in intermediate headers of microchannel condensers

Li, J. & Hrnjak, P., Jan 1 2018, Fluids Engineering. American Society of Mechanical Engineers (ASME), (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); vol. 7).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Phase separation in vertical header of microchannel condensers - A mechanistic model

Li, J. & Hrnjak, P., Jan 1 2018, Fluid Machinery; Erosion, Slurry, Sedimentation; Experimental, Multiscale, and Numerical Methods for Multiphase Flows; Gas-Liquid, Gas-Solid, and Liquid-Solid Flows; Performance of Multiphase Flow Systems; Micro/Nano-Fluidics. American Society of Mechanical Engineers (ASME), (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; vol. 3).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2017

Effect of inclination on heat transfer in large flattened-tube steam condensers

Davies, W. A., Kang, Y., Hrnjak, P. & Jacobi, A. M., Jan 1 2017, Energy. American Society of Mechanical Engineers (ASME), (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); vol. 6).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Efficient very low charged ammonia systems

Hrnjak, P. S., Jan 1 2017, 7th Conference on Ammonia and CO2 Refrigeration Technology, Proceedings. International Institute of Refrigeration, p. 337-346 10 p. (Refrigeration Science and Technology).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2016

Natural refrigerants for light commercial applications: A fair comparison of the pros & cons of CO2 and propane

Elbel, S. & Hrnjak, P., Jan 1 2016, 12th IIR Gustav Lorentzen Natural Working Fluids Conference, GL 2016. International Institute of Refrigeration, p. 618-625 8 p. (Refrigeration Science and Technology).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2015

Distribution function for reversible microchannel heat exchanger with vertical headers - Considering the effects of inlet conditions, geometries and fluid properties

Zou, Y. & Hrnjak, P. S., 2015, 24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration, p. 1748-1755 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Flow development in the discharge of a compressor

Wujek, S. & Hrnjak, P., Jan 1 2015, 24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration, p. 1589-1596 8 p. (Refrigeration Science and Technology).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

High-efficiency, low-cost glass door merchandisers using transcritical carbon dioxide

Fuentes, Y. P., Hrnjak, P. S. & Elbel, S., 2015, 24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration, p. 2757-2764 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Low-charge propane refrigeration system technology for single and multi-door bottle coolers

Fuentes, Y. P., Hrnjak, P. S. & Elbel, S., Jan 1 2015, 24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration, p. 2749-2756 8 p. (Refrigeration Science and Technology).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Thermodynamic analysis of the transition between slug and annular flow in minichannels

Khovalyg, D. M., Hrnjak, P. S. & Jacobi, A. M., Jan 1 2015, ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2015, collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, (ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2015, collocated with the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Waste heat driven cooling by vapor jet ejector

Elbel, S., Wujek, S. & Hrnjak, P., Jan 1 2015, 24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration, p. 1958-1965 8 p. (Refrigeration Science and Technology).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2014

Extremely low refrigerant charge beverage display cooler technology using propane

Fuentes, Y. P., Elbel, S. & Hrnjak, P. S., Jan 1 2014, 11th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerants and Environmental Protection, GL 2014. International Institute of Refrigeration, p. 193-201 9 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Interactions between parallel minichannels during flow boiling of R134A

Khovalyg, D. M., Hrnjak, P. S., Baranenko, A. V. & Jacobi, A. M., Jan 1 2014, ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2014, Collocated with the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, (ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2014, Collocated with the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oil effects on in-tube boiling of CO2

Hrnjak, P. & Kim, S., Jan 1 2014, 11th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerants and Environmental Protection, GL 2014. Hu, W. & Zhao, G. (eds.). International Institute of Refrigeration, p. 510-518 9 p. (11th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerants and Environmental Protection, GL 2014).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

R-410A maldistribution impact on the performance of MicroChannel evaporator

Zou, Y., Tuo, H. & Hrnjak, P. S., Jan 1 2014, ASHRAE Transactions - ASHRAE Winter Conference. PART 1 ed. Amer. Soc. Heating, Ref. Air-Conditoning Eng. Inc., p. 406-415 10 p. (ASHRAE Transactions; vol. 120, no. PART 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Successful conversion and validation of glass door merchandisers using transcritical R744

Elbel, S., Fuentes, Y. P., Bowers, C. & Hrnjak, P., Jan 1 2014, 11th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerants and Environmental Protection, GL 2014. Hu, W. & Zhao, G. (eds.). International Institute of Refrigeration, p. 421-429 9 p. (11th IIR Gustav Lorentzen Conference on Natural Refrigerants: Natural Refrigerants and Environmental Protection, GL 2014).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2013

Assessment of reed valve dynamic behavior in a scroll compressor through visualization

Zimmermann, A. J. P. & Hrnjak, P. S., Jan 1 2013, Institution of Mechanical Engineers - 8th International Conference on Compressors and Their Systems. Woodhead Publishing Limited, p. 277-284 8 p. (Institution of Mechanical Engineers - 8th International Conference on Compressors and Their Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oil effects on in-tube evaporation of CO2 by altering flow regime and properties

Hrnjak, P. & Kim, S., Dec 1 2013, ASME 2013 Heat Transfer Summer Conf. Collocated with the ASME 2013 7th Int. Conf. on Energy Sustainability and the ASME 2013 11th Int. Conf. on Fuel Cell Science, Engineering and Technology, HT 2013. V002T04A012. (ASME 2013 Heat Transfer Summer Conf. Collocated with the ASME 2013 7th Int. Conf. on Energy Sustainability and the ASME 2013 11th Int. Conf. on Fuel Cell Science, Engineering and Technology, HT 2013; vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oil flow at discharge valve in a scroll compressor

Zimmermann, A. J. P. & Hrnjak, P. S., Jan 1 2013, Institution of Mechanical Engineers - 8th International Conference on Compressors and Their Systems. Woodhead Publishing Limited, p. 311-320 10 p. (Institution of Mechanical Engineers - 8th International Conference on Compressors and Their Systems).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2012

An experimentally validated modeling of refrigerant distribution in a parallel microchannel evaporator

Tuo, H., Bielskus, A. & Hrnjak, P. S., Aug 20 2012, ASHRAE Transactions - Papers Presented at the 2012 ASHRAE Winter Conference in Chicago, Illinois. PART 1 ed. p. 375-383 9 p. (ASHRAE Transactions; vol. 118, no. PART 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Controlled atmosphere brazing of microchannel heat exchangers for mini-cooling systems

Zhao, H., Elbel, S. & Hrnjak, P. S., Jun 15 2012, IBSC 2012 - Proceedings of the 5th International Brazing and Soldering Conference. p. 183-187 5 p. (IBSC 2012 - Proceedings of the 5th International Brazing and Soldering Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Design and evaluation of interior permanent magnet compressor motors for commercial transcritical CO2 (R-744) heat pump water heaters

Brown, I. P., Critchley, M. W., Yin, J., Memory, S. B., Elbel, S. W., Bowers, C. D., Petersen, M., Hrnjak, P. S. & Sizov, G. Y., Dec 17 2012, 2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012. p. 2790-2797 8 p. 6342379. (2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Experimental study of refrigerant two phase separation in a compact vertical T-junction

Tuo, H. & Hrnjak, P. S., Aug 20 2012, ASHRAE Transactions - Papers Presented at the 2012 ASHRAE Winter Conference in Chicago, Illinois. PART 1 ed. p. 672-680 9 p. (ASHRAE Transactions; vol. 118, no. PART 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Two-phase refrigerant maldistribution in the vertical header and its effect on the heat exchanger performance as evaporator in heat pump mode

Zou, Y., Tuo, H. & Hrnjak, P. S., Dec 1 2012, ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012. PARTS A, B, C, D ed. p. 1823-1832 10 p. (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); vol. 7, no. PARTS A, B, C, D).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2011

A mechanistic model of two-phase pressure drop in microchannels

Field, B. S. & Hrnjak, P., Jan 1 2011, Fluids and Thermal Systems; Advances for Process Industries. PARTS A AND B ed. American Society of Mechanical Engineers (ASME), p. 411-419 9 p. (ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011; vol. 6, no. PARTS A AND B).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Heat transfer performance for a falling-film on horizontal flat tubes

Wang, X., Hrnjak, P. S., Elbel, S., Jacobi, A. M. & He, M. G., Dec 1 2011, ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011. PARTS A AND B ed. p. 43-50 8 p. (ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011; vol. 10, no. PARTS A AND B).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2010

A study on the improving seasonal energy efficiency of an A/C System

Park, Y. C. & Hrnjak, P. S., May 28 2010, 2010 The 2nd International Conference on Computer and Automation Engineering, ICCAE 2010. p. 313-316 4 p. 5451434. (2010 The 2nd International Conference on Computer and Automation Engineering, ICCAE 2010; vol. 5).

Research output: Chapter in Book/Report/Conference proceedingConference contribution