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1

Flash gas bypass for improving the performance of transcritical R744 systems that use microchannel evaporators

Stefan Elbel, Pega Hrnjak

Journal:

International Journal of Refrigeration

Year:

2004

Language:

english

File:

PDF, 720 KB

english, 2004

2

Condensation from superheated vapor flow of R744 and R410A at subcritical pressures in a horizontal smooth tube

Chieko Kondou, Pega Hrnjak

Journal:

International Journal of Heat and Mass Transfer

Year:

2012

Language:

english

File:

PDF, 1.36 MB

english, 2012

3

Visualization and measurement of periodic reverse flow and boiling fluctuations in a microchannel evaporator of an air-conditioning system

Tuo, Hanfei, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2014

Language:

english

File:

PDF, 5.03 MB

english, 2014

4

Effects of fluid properties on two-phase flow and refrigerant distribution in the vertical header of a reversible microchannel heat exchanger – Comparing R245fa, R134a, R410A, and R32

Zou, Yang, Hrnjak, Pega S.

Journal:

Applied Thermal Engineering

Year:

2014

Language:

english

File:

PDF, 3.15 MB

english, 2014

5

Effect of end plates on heat transfer of plate heat exchanger

Jin, Shenghan, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2017

Language:

english

File:

PDF, 2.42 MB

english, 2017

6

Single phase pressure drop in microchannels

Pega Hrnjak, Xiao Tu

Journal:

International Journal of Heat and Fluid Flow

Year:

2007

Language:

english

File:

PDF, 462 KB

english, 2007

7

Microchannel heat exchangers for charge minimization in air-cooled ammonia condensers and chillers

Pega Hrnjak, Andy D. Litch

Journal:

International Journal of Refrigeration

Year:

2008

Language:

english

File:

PDF, 1.32 MB

english, 2008

8

Effect of venting the periodic reverse vapor flow on the performance of a microchannel evaporator in air-conditioning systems

Tuo, Hanfei, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2014

Language:

english

File:

PDF, 3.77 MB

english, 2014

9

Modeling refrigerant maldistribution in microchannel heat exchangers with vertical headers based on experimentally developed distribution results

Zou, Yang, Tuo, Hanfei, Hrnjak, Pega S.

Journal:

Applied Thermal Engineering

Year:

2014

Language:

english

File:

PDF, 2.89 MB

english, 2014

10

Experiment and visualization on R134a upward flow in the vertical header of microchannel heat exchanger and its effect on distribution

Zou, Yang, Hrnjak, Pega S.

Journal:

International Journal of Heat and Mass Transfer

Year:

2013

Language:

english

File:

PDF, 3.40 MB

english, 2013

11

Pressure drop in round cylindrical headers of parallel flow MCHXs: Pressure loss coefficients for single phase flow

Ren, Tao, Hrnjak, Pega

Journal:

International Journal of Refrigeration

Year:

2015

Language:

english

File:

PDF, 1.26 MB

english, 2015

12

Single-phase and two-phase flow pressure drop in the vertical header of microchannel heat exchanger

Zou, Yang, Hrnjak, Pega S.

Journal:

International Journal of Refrigeration

Year:

2014

Language:

english

File:

PDF, 5.56 MB

english, 2014

13

Numerical simulation of three dimensional two-phase flow and prediction of oil retention in an evaporator of the automotive air conditioning system

Stevanovic, Vladimir D., Hrnjak, Pega

Journal:

Applied Thermal Engineering

Year:

2017

Language:

english

File:

PDF, 1.03 MB

english, 2017

14

A new method to simultaneously measure local heat transfer and visualize flow boiling in plate heat exchanger

Jin, Shenghan, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2017

Language:

english

File:

PDF, 4.88 MB

english, 2017

15

Effect of refrigerant thermophysical properties on flow reversal in microchannel evaporators

Li, Huize, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2018

Language:

english

File:

PDF, 4.02 MB

english, 2018

16

Effect of straight micro fins on heat transfer and pressure drop of R410A during evaporation in round tubes

Yang, Cheng-Min, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2018

Language:

english

File:

PDF, 4.95 MB

english, 2018

17

Pressure drop of R134a, R32 and R1233zd(E) in diabatic conditions during condensation from superheated vapor

Xiao, Jiange, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2018

Language:

english

File:

PDF, 2.00 MB

english, 2018

18

Heat transfer and pressure drop of R32 evaporating in one pass microchannel tube with parallel channels

Li, Houpei, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2018

File:

PDF, 4.07 MB

2018

19

SAE Technical Paper Series [SAE International Vehicle Thermal Management Systems Conference & Exposition - (MAY. 10, 2005)] SAE Technical Paper Series - Clutch Cycling Mode of Compressor Capacity Control of Transcritical R744 Systems Compared to R134a Systems

Mcenaney, Ryan, Hrnjak, Pega

Year:

2005

Language:

english

File:

PDF, 507 KB

english, 2005

20

Heat transfer and pressure drop of R32 evaporating in one pass microchannel tube with parallel channels

Li, Houpei, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2018

Language:

english

File:

PDF, 4.07 MB

english, 2018

21

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

Li, Houpei, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2019

Language:

english

File:

PDF, 2.91 MB

english, 2019

22

Experimental investigation on two-phase flow boiling heat transfer of five refrigerants in horizontal small tubes of 0.5, 1.5 and 3.0 mm inner diameters

Jong-Taek Oh, A.S. Pamitran, Kwang-Il Choi, Pega Hrnjak

Journal:

International Journal of Heat and Mass Transfer

Year:

2011

Language:

english

File:

PDF, 2.36 MB

english, 2011

23

Heat rejection from R744 flow under uniform temperature cooling in a horizontal smooth tube around the critical point

Chieko Kondou, Pega Hrnjak

Journal:

International Journal of Refrigeration

Year:

2011

Language:

english

File:

PDF, 1.86 MB

english, 2011

24

Detection of liquid mass fraction at the evaporator exit of refrigeration systems

Pega S Hrnjak, Mark A Shannon, Todd M Leicht, Norman R Miller

Journal:

International Journal of Thermal Sciences

Year:

2001

Language:

english

File:

PDF, 545 KB

english, 2001

25

Experimental and numerical study on microchannel and round-tube condensers in a R410A residential air-conditioning system

Chang Yong Park, Pega Hrnjak

Journal:

International Journal of Refrigeration

Year:

2008

Language:

english

File:

PDF, 921 KB

english, 2008

26

Experimental validation of a prototype ejector designed to reduce throttling losses encountered in transcritical R744 system operation

Stefan Elbel, Pega Hrnjak

Journal:

International Journal of Refrigeration

Year:

2008

Language:

english

File:

PDF, 1.05 MB

english, 2008

27

Flash gas bypass in mobile air conditioning system with R134a

Tuo, Hanfei, Hrnjak, Pega

Journal:

International Journal of Refrigeration

Year:

2012

Language:

english

File:

PDF, 1.92 MB

english, 2012

28

Periodical reverse flow and boiling fluctuations in a microchannel evaporator of an air-conditioning system

Tuo, Hanfei, Hrnjak, Pega

Journal:

International Journal of Refrigeration

Year:

2013

Language:

english

File:

PDF, 4.49 MB

english, 2013

29

Pressure drop in D shaped cylindrical headers of parallel flow MCHXs: Pressure loss coefficients for single phase flow

Ren, Tao, Hrnjak, Pega

Journal:

Applied Thermal Engineering

Year:

2014

Language:

english

File:

PDF, 4.57 MB

english, 2014

30

Effect of the header pressure drop induced flow maldistribution on the microchannel evaporator performance

Tuo, Hanfei, Hrnjak, Pega

Journal:

International Journal of Refrigeration

Year:

2013

Language:

english

File:

PDF, 3.04 MB

english, 2013

31

Developing Adiabatic Two Phase Flow in Headers—Distribution Issue in Parallel Flow Microchannel Heat Exchangers

Journal:

Heat Transfer Engineering

Year:

2004

Language:

english

File:

PDF, 8.90 MB

english, 2004

32

Experimentally Validated Model of Refrigerant Distribution in a Parallel Microchannel Evaporator

Tuo, Hanfei, Bielskus, Algirdas, Hrnjak, Pega

Journal:

SAE International Journal of Materials and Manufacturing

Year:

2012

Language:

english

File:

PDF, 7.36 MB

english, 2012

33

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

Xiao, Jiange, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2017

Language:

english

File:

PDF, 2.54 MB

english, 2017

34

Modeling of bubble dynamics in single diabatic microchannel

Li, Huize, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2017

Language:

english

File:

PDF, 2.61 MB

english, 2017

35

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

Li, Huize, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2017

Language:

english

File:

PDF, 2.51 MB

english, 2017

36

Improvement of condenser performance by phase separation confirmed experimentally and by modeling

Li, Jun, Hrnjak, Pega

Journal:

International Journal of Refrigeration

Year:

2017

Language:

english

File:

PDF, 1.60 MB

english, 2017

37

A heat transfer model for condensation accounting for non-equilibrium effects

Xiao, Jiange, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2017

Language:

english

File:

PDF, 991 KB

english, 2017

38

Effect of channel geometry on flow reversal in microchannel evaporators

Li, Huize, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2017

Language:

english

File:

PDF, 3.13 MB

english, 2017

39

Measurement of heat transfer coefficient and pressure drop during evaporation of R134a in new type facility with one pass flow through microchannel tube

Li, Houpei, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2017

Language:

english

File:

PDF, 2.57 MB

english, 2017

40

Visualization and quantification of separation of liquid-vapor two-phase flow in a vertical header at low inlet quality

Li, Jun, Hrnjak, Pega

Journal:

International Journal of Refrigeration

Year:

2017

Language:

english

File:

PDF, 2.07 MB

english, 2017

41

A pressure drop model for condensation accounting for non-equilibrium effects

Xiao, Jiange, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2018

Language:

english

File:

PDF, 1.35 MB

english, 2018

42

SAE Technical Paper Series [SAE International Vehicle Thermal Management Systems Conference & Exposition - (MAY. 10, 2005)] SAE Technical Paper Series - Using R744 (CO2) to Cool an Up-Armored M1114 HMMWV

Memory, Steve, Yin, Jian-Min, Collier, Sam, Gunter, Mark, Hrnjak, Pega, Peuker, Steffen, Elber, Stefan, Manzione, John, Schultz, Nicholas, Dolney, John

Year:

2005

Language:

english

File:

PDF, 658 KB

english, 2005

43

Flow visualization of R32 in parallel-port microchannel tube

Li, Houpei, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2019

Language:

english

File:

PDF, 2.73 MB

english, 2019

44

A flow regime map for condensation in macro and micro tubes with non-equilibrium effects taken into account

Xiao, Jiange, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2019

Language:

english

File:

PDF, 1.86 MB

english, 2019

45

Flow regimes during condensation from superheated vapor

Xiao, Jiange, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2019

Language:

english

File:

PDF, 1.98 MB

english, 2019

46

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

Li, Houpei, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2019

Language:

english

File:

PDF, 2.77 MB

english, 2019

47

Void Fraction Measurement and Flow Regimes Visualization of R134a in Horizontal and Vertical ID 7 mm Circular Tubes

Qian, Hongliang, Hrnjak, Pega

Journal:

International Journal of Refrigeration

Year:

2019

Language:

english

File:

PDF, 2.23 MB

english, 2019

48

Effect of helical micro-fins on two-phase flow behavior of R410A evaporating in horizontal round tubes obtained through visualization

Yang, Cheng-Min, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2019

Language:

english

File:

PDF, 3.75 MB

english, 2019

49

Effect of helical micro-fins on two-phase flow behavior of R410A evaporating in horizontal round tubes obtained through visualization

Yang, Cheng-Min, Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2019

File:

PDF, 3.75 MB

2019

50

A correlation for heat transfer coefficient during stratified steam condensation in large flattened tubes with variable inclination and wall temperature

Davies, William A., Hrnjak, Pega

Journal:

International Journal of Heat and Mass Transfer

Year:

2020

Language:

english

File:

PDF, 4.44 MB

english, 2020

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