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Author

  • Predrag Stojan Hrnjak
2015

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., Sizov, G. Y., Elbel, S., Bowers, C. D., Petersen, M. & Hrnjak, P. S., Jan 1 2015, In : IEEE Transactions on Industry Applications. 51, 1, p. 576-586 11 p., 6823666.

Research output: Contribution to journalArticle

2016

Evaporator performance enhancement by pulsation width modulation (PWM)

Wang, X., Tang, K. & Hrnjak, P. S., Apr 25 2016, In : Applied Thermal Engineering. 99, p. 825-833 9 p.

Research output: Contribution to journalArticle

2019
Open Access
2013

Controlled atmosphere brazing of aluminum heat exchangers

Zhao, H., Elbel, S. & Hrnjak, P. S., Feb 1 2013, In : Welding Journal. 92, 2, p. 44-46 3 p.

Research output: Contribution to journalArticle

2015
2014

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

Zou, Y., Tuo, H. & Hrnjak, P. S., 2014, ASHRAE Transactions - ASHRAE Winter Conference. PART 1 ed. ASHRAE, p. 406-415 10 p. (ASHRAE Transactions; vol. 120, no. PART 1).

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

2015

Modeling of oil retention and pressure drop in vertical suction risers

Sethi, A. & Hrnjak, P. S., Jan 1 2015, In : Science and Technology for the Built Environment. 21, 7, p. 1033-1046 14 p.

Research output: Contribution to journalArticle

2018
2019

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

2011
2020
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

2014
2017

A new flow regime map and void fraction model based on the flow characterization of condensation

Xiao, J. & Hrnjak, P., Jan 1 2017, In : International Journal of Heat and Mass Transfer. 108, p. 443-452 10 p.

Research output: Contribution to journalArticle

2014
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

2014

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

2019

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

Davies, W. A., Kang, Y., Hrnjak, P. & Jacobi, A. M., Feb 5 2019, In : Applied Thermal Engineering. 148, p. 999-1006 8 p.

Research output: Contribution to journalArticle

2016

Refrigerant and lubricant charge in air condition heat exchangers: Experimentally validated model

Jin, S. & Hrnjak, P. S., Jul 1 2016, In : International Journal of Refrigeration. 67, p. 395-407 13 p.

Research output: Contribution to journalArticle

2015

An experimentally validated model for microchannel heat exchanger incorporating lubricant effect

Li, H. & Hrnjak, P., Nov 1 2015, In : International Journal of Refrigeration. 59, p. 259-268 10 p.

Research output: Contribution to journalArticle

2019

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

2017

Visualization and measurement of reverse flow in an actual channel of a microchannel evaporator

Li, H. & Hrnjak, P., Jan 1 2017, In : International Journal of Heat and Mass Transfer. 108, p. 2346-2354 9 p.

Research output: Contribution to journalArticle

2019

Heat transfer and flow regimes in large flattened-tube steam condensers

Davies, W. A., Kang, Y., Hrnjak, P. & Jacobi, A. M., Feb 5 2019, In : Applied Thermal Engineering. 148, p. 722-733 12 p.

Research output: Contribution to journalArticle

2015

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

2013

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

2020

Séparateur d'huile à inertie pour compresseurs

Translated title of the contribution: Impinging oil separator for compressorsXu, J. & Hrnjak, P., Nov 2020, In : International Journal of Refrigeration. 119, p. 110-118 9 p.

Research output: Contribution to journalArticle

Nouvelle cartographie de la configuration d'écoulement pour l'ébullition de R410A en écoulement dans des tubes horizontaux à micro-ailettes tenant compte de l'effet de l'angle d'hélice

Translated title of the contribution: A new flow pattern map for flow boiling of R410A in horizontal micro-fin tubes considering the effect of the helix angleYang, C. M. & Hrnjak, P., Jan 2020, In : International Journal of Refrigeration. 109, p. 154-160 7 p.

Research output: Contribution to journalArticle

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

2017
2019

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

2015

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
2018

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

2013
2019
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

2019

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

2013

Development of high-efficiency carbon dioxide commercial heat pump water heater

Petersen, M., Bowers, C., Elbel, S. & Hrnjak, P., Oct 3 2013, In : HVAC and R Research. 19, 7, p. 823-835 13 p.

Research output: Contribution to journalArticle

2015

Transient pressure drop cross-correlation during flow boiling of R134a in parallel minichannels

Khovalyg, D. M., Hrnjak, P. S. & Jacobi, A. M., Jan 1 2015, In : Science and Technology for the Built Environment. 21, 5, p. 545-554 10 p.

Research output: Contribution to journalArticle

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

2020
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

2017
2019

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

2013

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

Wang, X. F., Hrnjak, P. S., Elbel, S., Jacobi, A. M. & He, M. G., Jun 17 2013, In : Journal of Heat Transfer. 135, 7, 072901.

Research output: Contribution to journalArticle