### Abstract

In this study, the flow boiling heat transfer characteristics of R-1234ze(E) and R-134a in plate heat exchangers with different Chevron angles are measured and analyzed as a function of the mass flux, saturation temperature, vapor quality, and heat flux. The effect of the mass flux on the heat transfer and pressure drop of R-1234ze(E) is substantial. The heat transfer coefficient of R-1234ze(E) for a Chevron angle of 60° is approximately 3.7 times higher than that for a Chevron angle of 30° at high vapor qualities owing to the intensified turbulent flow. Moreover, for a Chevron angle of 60° the average heat transfer coefficient of R-1234ze(E) is on average 4.7% higher than that of R-134a due to its higher equivalent Reynolds number. However, the average pressure drop of R-1234ze(E) is higher than that of R-134a owing to the lower vapor density of R-1234ze(E). Finally, the correlations for the heat transfer and pressure drop of R-1234ze(E) are developed in the plate heat exchangers with different Chevron angles.

Original language | English |
---|---|

Pages (from-to) | 719-729 |

Number of pages | 11 |

Journal | Applied Thermal Engineering |

Volume | 132 |

DOIs | |

Publication status | Published - 2018 Mar 5 |

### Fingerprint

### Keywords

- Heat transfer coefficient
- Low GWP
- Plate heat exchanger
- Pressure drop
- R-1234ze(E)

### ASJC Scopus subject areas

- Energy Engineering and Power Technology
- Industrial and Manufacturing Engineering

### Cite this

*Applied Thermal Engineering*,

*132*, 719-729. https://doi.org/10.1016/j.applthermaleng.2018.01.019

**Comparative evaluation of flow boiling heat transfer characteristics of R-1234ze(E) and R-134a in plate heat exchangers with different Chevron angles.** / Kim, Dongwoo; Lee, Dong Chan; Jang, Dong Soo; Jeon, Yongseok; Kim, Yong Chan.

Research output: Contribution to journal › Article

*Applied Thermal Engineering*, vol. 132, pp. 719-729. https://doi.org/10.1016/j.applthermaleng.2018.01.019

}

TY - JOUR

T1 - Comparative evaluation of flow boiling heat transfer characteristics of R-1234ze(E) and R-134a in plate heat exchangers with different Chevron angles

AU - Kim, Dongwoo

AU - Lee, Dong Chan

AU - Jang, Dong Soo

AU - Jeon, Yongseok

AU - Kim, Yong Chan

PY - 2018/3/5

Y1 - 2018/3/5

N2 - In this study, the flow boiling heat transfer characteristics of R-1234ze(E) and R-134a in plate heat exchangers with different Chevron angles are measured and analyzed as a function of the mass flux, saturation temperature, vapor quality, and heat flux. The effect of the mass flux on the heat transfer and pressure drop of R-1234ze(E) is substantial. The heat transfer coefficient of R-1234ze(E) for a Chevron angle of 60° is approximately 3.7 times higher than that for a Chevron angle of 30° at high vapor qualities owing to the intensified turbulent flow. Moreover, for a Chevron angle of 60° the average heat transfer coefficient of R-1234ze(E) is on average 4.7% higher than that of R-134a due to its higher equivalent Reynolds number. However, the average pressure drop of R-1234ze(E) is higher than that of R-134a owing to the lower vapor density of R-1234ze(E). Finally, the correlations for the heat transfer and pressure drop of R-1234ze(E) are developed in the plate heat exchangers with different Chevron angles.

AB - In this study, the flow boiling heat transfer characteristics of R-1234ze(E) and R-134a in plate heat exchangers with different Chevron angles are measured and analyzed as a function of the mass flux, saturation temperature, vapor quality, and heat flux. The effect of the mass flux on the heat transfer and pressure drop of R-1234ze(E) is substantial. The heat transfer coefficient of R-1234ze(E) for a Chevron angle of 60° is approximately 3.7 times higher than that for a Chevron angle of 30° at high vapor qualities owing to the intensified turbulent flow. Moreover, for a Chevron angle of 60° the average heat transfer coefficient of R-1234ze(E) is on average 4.7% higher than that of R-134a due to its higher equivalent Reynolds number. However, the average pressure drop of R-1234ze(E) is higher than that of R-134a owing to the lower vapor density of R-1234ze(E). Finally, the correlations for the heat transfer and pressure drop of R-1234ze(E) are developed in the plate heat exchangers with different Chevron angles.

KW - Heat transfer coefficient

KW - Low GWP

KW - Plate heat exchanger

KW - Pressure drop

KW - R-1234ze(E)

UR - http://www.scopus.com/inward/record.url?scp=85044764775&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85044764775&partnerID=8YFLogxK

U2 - 10.1016/j.applthermaleng.2018.01.019

DO - 10.1016/j.applthermaleng.2018.01.019

M3 - Article

AN - SCOPUS:85044764775

VL - 132

SP - 719

EP - 729

JO - Applied Thermal Engineering

JF - Applied Thermal Engineering

SN - 1359-4311

ER -