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Research Papers

Simulation Research of Heat Transfer Characteristics of Carbon Dioxide in Microchannel Evaporator

[+] Author and Article Information
Lv Jing

College of Environment and Building,
University of Shanghai for Science
and Technology,
Shanghai 200093, China
e-mail: lvjing810@163.com

Shi Dongdong, Wang Taisheng, Fu Yijun

College of Environment and Building,
University of Shanghai for Science
and Technology,
Shanghai 200093, China

Li Chang

ZheJiang SanHua Automotive
Components Company Limited,
HangZhou 310018, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received January 23, 2017; final manuscript received February 26, 2018; published online July 13, 2018. Assoc. Editor: Wei Li.

J. Thermal Sci. Eng. Appl 10(6), 061001 (Jul 13, 2018) (12 pages) Paper No: TSEA-17-1022; doi: 10.1115/1.4040656 History: Received January 23, 2017; Revised February 26, 2018

In this paper, the simulation model of two-dimensional (2D) distribution parameter of a CO2 microchannel evaporator was developed using the finite element method. The simulation model of the CO2 microchannel evaporator was written using matlab both considering the dry and wet conditions on air side, and different heat transfer characteristics of CO2 in two-phase region and overheated region. The experimental and simulation results in terms of CO2 temperature, wall temperature, inlet and outlet air temperatures, and convective heat transfer coefficient were compared. The simulation results have the same tendency with the experimental correlation results. The convective heat transfer efficient increases with the growth of CO2 inlet dryness, mass flow rate and air speed, while decreases along with the increase of evaporation pressure in two-phase region. The dry-out point appears earlier with larger CO2 inlet dryness, and higher air temperature, humidity and speed; however, it appears later with the increasing evaporation pressure and mass flow rate. The convective heat transfer coefficient at the dry-out point decreases dramatically due to the deteriorated heat transfer at this position, which indicates the necessity to prevent or retard the appearance of dry-out point.

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References

Lorentzen, G. , 1995, “ The Use of Natural Refrigerants: A Complete Solution to the CFC/HCFC Predicament,” Int. J. Refrig., 18(3), pp. 190–197. [CrossRef]
Zhao, Y. , and Ohadi, M. M. , 2004, “ Experimental Study of Supercritical CO2 Gas Cooling in a Microchannel Gas Cooler,” ASHRAE Trans., 110(3), pp. 291–300.
Pettersen, J. , 2003, “ Two-Phase Flow Pattern, Heat Transfer, and Pressure Drop in Microchannel Vaporization of CO2,” ASHRAE Trans., 109, pp. 523–532.
Pettersen, J. , 2004, “ Two-phase flow patterns in microchannel vaporization of CO2 at near-critical pressure,” Heat transfer engineering, 25(3), 52–60.
Shah, M. M. , 1976, “ A New Correlation for Heat Transfer During Boiling Flow Through Pipes,” ASHRAE Trans., 82(2), pp. 66–86.
Gungor, K. E. , and Winterton, R. H. S. , 1986, “ A General Correlation for Flow Boiling in Tubes and Annuli,” Int. J. Heat Mass Transfer, 29(3), pp. 351–358. [CrossRef]
Hwang, Y. , 1997, A Feasibility Study on Carbon Dioxide Refrigerant Cycle, University of Maryland, College Park, MD.
Yoon, S. H. , Cho, E. S. , Yun, W. H. , et al. ., 2004, “ Characteristics of Evaporative Heat Transfer and Pressure Drop of Carbon Dioxide and Correlation Development,” Int. J. Refrig., 27(2), pp. 111–119. [CrossRef]
Cheng, L. , Ribatski, G. , and Thome, J. R. , 2008, “ New Prediction Methods for CO2 Evaporation Inside Tubes—Part II: An Updated General Flow Boiling Heat Transfer Model Based on Flow Patterns,” Int. J. Heat Mass Transfer, 51(1–2), pp. 125–135. [CrossRef]
Wojtan, L. , Ursenbacher, T. , and Thome, J. R. , 2005, “ Investigation of Flow Boiling in Horizontal Tubes—Part I: A New Diabatic Two-Phase Flow Pattern Map,” Int. J. Heat Mass Transfer, 48(14), pp. 2955–2969. [CrossRef]
Wojtan, L. , Ursenbacher, T. , and Thome, J. R. , 2005, “ Investigation of Flow Boiling in Horizontal Tubes—Part II: Development of a New Heat Transfer Model for Stratified-Wavy, Dryout and Mist Flow Regimes,” Int. J. Heat Mass Transfer, 48(14), pp. 2970–2985. [CrossRef]
Zhang, H. , and Guo, B. , 2012, “ Numerical Simulation of the Carbon Dioxide Microchannel Evaporator Using Distributed Parameter Model,” J. Xi'an Jiao Tong Univ., 46(1), pp. 42–47.
Jifeng, J. , 2010, Research on a Carbon Dioxide Automobile Air Conditioning System Using Microchannel Heat Exchangers, Shanghai Jiao Tong University, Shanghai, China.
Gnielinski, V. , 1976, “ New Equations for Heat and Mass Transfer in Turbulent Pipe and Channel Flow,” Int. Chem. Eng., 16(2), pp. 359–368.
Sieder, E. N. , and Tate, G. E. , 1936, “ Heat Transfer and Pressure Drop of Liquids in Tubes,” Ind. Eng. Chem., 28(12), pp. 1429–1435. [CrossRef]
Cheng, L. , Ribatski, G. , Wojtan, L. , and Thome, J. R. , 2006, “ New Flow Boiling Heat Transfer Model and Flow Pattern Map for Carbon Dioxide Evaporating Inside Horizontal Tubes,” Int. J. Heat Mass Transfer, 49(21–22), pp. 4082–4094. [CrossRef]
Kim, M. H. , and Bullard, C. W. , 2002, “ Air-Side Thermal Hydraulic Performance of Multi-Louvered Fin Aluminum Heat Exchangers,” Int. J. Refrig., 25(3), pp. 390–400. [CrossRef]
Kim, M. H. , and Bullard, C. W. , 2002, “ Air-Side Performance of Brazed Aluminum Heat Exchangers Under Dehumidifying Conditions,” Int. J. Refrig., 25(7), pp. 924–934. [CrossRef]
Kuehn, T. H. , Ramsey, J. W. , and Threlkeld, J. L. , 1998, Thermal Environmental Engineering, Prentice Hall, Upper Saddle River, NJ.

Figures

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Fig. 1

Diagram of the microchannel evaporator: (a) structural diagram of the louver fin and (b) sectional view of the louver fin

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Fig. 2

Diagram of the louver fin of the microchannel evaporator (a) Structural diagram of the louver fin and (b) Sectional view of the louver fin

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Fig. 3

The schematic diagram of CO2 microchannel evaporator testing system

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Fig. 4

Sectional view of control volume

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Fig. 5

The figure of control volume

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Fig. 6

Simulation process of heat transfer only in two-phase region

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Fig. 7

Simulation process of heat transfer in both two-phase region and overheated region

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Fig. 8

Comparison of CO2 temperature, wall temperature, air inlet and outlet temperatures

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Fig. 9

Comparison of the convective heat transfer coefficient

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Fig. 10

The distribution of CO2 temperature, wall temperature and convective heat transfer coefficient

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Fig. 11

Influence of evaporation pressure on the convective heat transfer coefficient

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Fig. 12

Influence of inlet CO2 dryness on the convective heat transfer coefficient

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Fig. 13

Influence of CO2 mass flow rate on the convective heat transfer coefficient

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Fig. 14

Influence of air temperature on the convective heat transfer coefficient

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Fig. 15

Influence of air relative humidity on the convective heat transfer coefficient

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Fig. 16

Influence of air speed on the convective heat transfer coefficient

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