Entropy generation and sensitivity analysis of R134a flow condensation inside a helically coiled tube-in-tube heat exchanger

2021 ◽  
Author(s):  
Yan Cao ◽  
Mohammad Ali Abdous ◽  
Shahriyar Ghazanfari Holagh ◽  
Mahmood Shafiee ◽  
Mehran Hashemian
Keyword(s):  
Sensitivity Analysis ◽  
Heat Exchanger ◽  
Entropy Generation ◽  
Coiled Tube ◽  
Tube Heat Exchanger ◽  
Helically Coiled Tube ◽  
Flow Condensation

Numerical Analysis of Heat Transfer on the Shell Side of a Helically Coiled Tube Heat Exchanger for Helium Applications

2021 ◽  
Vol 7 (2) ◽  
Author(s):  
Radomír Filip ◽  
Tomáš Melichar
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Numerical Model ◽  
Constant Heat Flux ◽  
Heat Fluxes ◽  
Heat Transfer Correlation ◽  
Shell Side ◽  
Coiled Tube ◽  
Tube Heat Exchanger ◽  
Helically Coiled Tube

Abstract A new heat transfer correlation for high temperature helium on the shell side of a helically coiled tube heat exchanger was derived with the use of computational fluid dynamics (CFD) tools. The use of suitable heat transfer correlations has an impact on the evaluation of performance of a heat exchanger in relation to the requirements for a sufficient heat transfer surface, which relates to material cost requirements; therefore, it is of high importance. A numerical model was validated with data measured using the helium cooler, which is part of an experimental channel located at the Research Center Řež (CVR) in the Czech Republic. The numerical model used for obtaining the heat transfer correlation assumes a constant heat flux on the wall of the helical coil. In total, 72 cases with varying inlet temperatures, velocities, and heat fluxes were simulated to obtain the heat transfer correlation. Furthermore, the effects of the flow rectifier within the channel regarding the heat transfer coefficient and pressure loss were discussed.

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