Correlation Development for Frictional Pressure Drop of Flow Boiling in Plate Heat Exchangers

2021 ◽  
Author(s):  
Lv Tong ◽  
Wang Lei ◽  
Boren Zheng ◽  
Wei Li
Keyword(s):  
Pressure Drop ◽  
Heat Exchangers ◽  
Flow Boiling ◽  
Plate Heat ◽  
Frictional Pressure Drop

A General Correlation for Frictional Pressure Drop of Flow Boiling in Plate Heat Exchangers

2020 ◽  
Author(s):  
Weiyu Tang ◽  
Tong Lv ◽  
Boren Zheng ◽  
Wei Li
Keyword(s):  
Pressure Drop ◽  
Heat Exchangers ◽  
Flow Boiling ◽  
Saturation Pressure ◽  
Influence Factors ◽  
Two Phase ◽  
Plate Heat ◽  
General Correlation ◽  
Frictional Pressure Drop ◽  
Data Points

Abstract Plate heat exchangers are widely used in various industries for many years. The corrugated channels on the plates effectively enhance the turbulence of flow boiling and complicate the prediction of pressure drop. This paper presents a brief review about the influence factors of frictional pressure drop during flow boiling in plate heat exchangers. Experimental data points of frictional pressure drop were collected from previous literatures to develop a general correlation. The database contained 454 data points, covering eight refrigerants, mass flux range 5.5–137 kg m-2 s-1, heat flux 0–30 kW m-2, vapor quality 0.07–0.95, saturation pressure 0.11–2.7 MPa, chevron angle 30°–70° and hydraulic diameter 1.7–5.4 mm. In this work, several existing correlations were compared with the database, and all of them seem fail to give an acceptable prediction. A new correlation was proposed with multiple regression analysis in terms of two-phase Fanning friction factor. The new method showed good agreement and predicted 63.2% and 92.9% of data points within ±30% and ±50% errors, respectively.

Analysis of Flow Boiling Frictional Pressure Drop in Plate Heat Exchangers

2020 ◽  
Vol 13 (3) ◽  
Author(s):  
Weiyu Tang ◽  
Tong Lv ◽  
Wei Li ◽  
S. A. Sherif ◽  
Zahid Ayub ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Heat Exchangers ◽  
Flow Boiling ◽  
Saturation Temperature ◽  
Two Phase ◽  
Plate Heat ◽  
Frictional Pressure Drop ◽  
Data Points ◽  
Geometrical Factors ◽  
Fanning Friction Factor

Abstract Plate heat exchangers are widely used in various industries for many years. The corrugated channels on the plates effectively enhance the turbulence of flow boiling and complicate the prediction of pressure drop. This article presents a brief review about effects of various operating and geometrical factors on frictional pressure drop during flow boiling in plate heat exchangers. Experimental data points of frictional pressure drop were collected from the previous literature to develop a general correlation. The database contained 591 data points, covering six different refrigerants, mass flux range 5.5–130 kg/m2/s1, heat flux 0–15 kW/m2, vapor quality 0.04–0.96, saturation temperature −25 to 61 C°, chevron angle 20 deg–65 deg, and hydraulic diameter 1.7–5.35 mm. In this study, several existing correlations were compared with the database, and most of them seem fail to give an acceptable prediction. A new correlation was proposed with multiple regression analysis in terms of two-phase Fanning friction factor. The new method showed a good agreement with the present database and predicted 70.2% and 91.7% of data points within ±30% and ±50% errors, respectively.

Review: Condensation and Evaporation Characteristics of Low GWP Refrigerants in Plate Heat Exchangers

2016 ◽  
Vol 24 (02) ◽  
pp. 1630004 ◽  
Author(s):  
Byung Hoon Shon ◽  
Seung Won Jeon ◽  
Yongchan Kim ◽  
Yong Tae Kang
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Heat Exchangers ◽  
Heat Transfer Performance ◽  
Saturation Temperature ◽  
Transfer Performance ◽  
Plate Heat ◽  
Frictional Pressure Drop ◽  
Evaporation Heat ◽  
Lower Heat

In this paper, condensation and evaporation characteristics of low global warming potential (GWP) refrigerants such as R-1234yf and R-1234ze series are reviewed. This review focuses on heat transfer and pressure drop in plate heat exchangers. Mass flux is considered as an important factor while saturation temperature is not for condensation and evaporation process in plate heat exchangers. The dryout phenomenon occurs occasionally and gives greatly harmful impact on evaporation heat transfer. It is found that R-1234yf and R-1234ze(E) give slightly lower heat transfer performance than R-134a for both condensation and evaporation processes. Generally, low GWP refrigerants presented in this review give lower heat transfer coefficient and higher frictional pressure drop than the conventional refrigerants. Nevertheless, R-1234ze(Z) gives superior heat transfer performance than other refrigerants in condensation. R-32 gives remarkable performance in evaporation, but it gives relatively high GWP compared to other low GWP refrigerants.

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