Predrag Stojan Hrnjak

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Research Output

2020

Étalonnage basé sur la mesure de masse d'un capteur capacitif pour mesurer la fraction de vide pour le R134a dans des tubes lisses

Translated title of the contribution: Mass measurement based calibration of a capacitive sensor to measure void fraction for R134a in smooth tubesQian, H. & Hrnjak, P., Feb 2020, In : International Journal of Refrigeration. 110, p. 168-177 10 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

Pressure drop and heat transfer of flow boiling R134a in a dimpled flat duct

Tang, K., Gao, Y., Feng, Y. & Hrnjak, P., Apr 2020, In : International Journal of Heat and Mass Transfer. 151, 119398.

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

Caractéristiques de l’écoulement du brouillard annulaire d'huile dans la canalisation de refoulement du compresseur

Translated title of the contribution: Characteristics of oil annular-mist flow in the compressor discharge pipeXu, J. & Hrnjak, P. S., Nov 2019, In : International Journal of Refrigeration. 107, p. 145-154 10 p.

Research output: Contribution to journalArticle

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

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

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

Effects of Airflow Profile and Condensation Pressure on Performance of Air-Cooled Condensers

Davies, W. A. & Hrnjak, P., Jan 1 2019, (Accepted/In press) In : Heat Transfer Engineering.

Research output: Contribution to journalArticle

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 plug/slug flow characteristic of R134a in a 0.643 mm microchannel tube

Li, H. & Hrnjak, P., Apr 2019, In : International Journal of Heat and Mass Transfer. 132, p. 1062-1073 12 p.

Research output: Contribution to journalArticle

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

Flow regimes during condensation from superheated vapor

Xiao, J. & Hrnjak, P., Apr 2019, In : International Journal of Heat and Mass Transfer. 132, p. 301-308 8 p.

Research output: Contribution to journalArticle

Flow visualization of R1234ze(E) in a 0.643 mm microchannel tube

Li, H. & Hrnjak, P., Jun 2019, In : International Journal of Heat and Mass Transfer. 136, p. 950-961 12 p.

Research output: Contribution to journalArticle

Flow visualization of R32 in parallel-port microchannel tube

Li, H. & Hrnjak, P., Jan 2019, In : International Journal of Heat and Mass Transfer. 128, p. 1-11 11 p.

Research output: Contribution to journalArticle

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

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

Heat Transfer in a Large, Inclined, Flattened-Tube Steam Condenser

Davies, W. A. & Hrnjak, P., Jan 1 2019, (Accepted/In press) In : Heat Transfer Engineering. 41, 17, p. 1443-1456 14 p.

Research output: Contribution to journalArticle

Mesurage de la fraction de vide et visualisation des régimes d’écoulement de R134a dans des tubes circulaires horizontaux et verticaux d'un diamètre intérieur de 7mm

Translated title of the contribution: Void fraction measurement and flow regimes visualization of R134a in horizontal and vertical ID 7 mm circular tubesQian, H. & Hrnjak, P., Jul 2019, In : International Journal of Refrigeration. 103, p. 191-203 13 p.

Research output: Contribution to journalArticle

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

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

Numerical study of steam condensation inside a long inclined flattened channel

Abadi, S. M. A. N. R., Davies, W. A., Hrnjak, P. S. & Meyer, J. P., May 2019, In : International Journal of Heat and Mass Transfer. 134, p. 450-467 18 p.

Research output: Contribution to journalArticle

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

Open Access

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

Séparateur d'huile par coalescence pour compresseurs

Translated title of the contribution: Coalescing oil separator for compressorsXu, J. & Hrnjak, P., Oct 2019, In : International Journal of Refrigeration. 106, p. 41-53 13 p.

Research output: Contribution to journalArticle

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

Thermo-hydraulic model for steam condensation in a large, inclined, flattened-tube air-cooled condenser

Davies, W. A. & Hrnjak, P., Feb 25 2019, In : Applied Thermal Engineering. 149, p. 745-756 12 p.

Research output: Contribution to journalArticle

Visualization of two-phase flow of R410A in horizontal smooth and axial micro-finned tubes

Yang, C. M. & Hrnjak, P., Aug 2019, In : International Journal of Heat and Mass Transfer. 138, p. 49-58 10 p.

Research output: Contribution to journalArticle

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

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