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• W4312053823 endingPage "105752" @default.
• W4312053823 startingPage "105752" @default.
• W4312053823 abstract "In recent years, geothermal energy as well has become the first choice for building heating. In order to improve the heat transfer performance of the coaxial GHE, the flow characteristics and heat transfer characteristics of the coaxial GHE when the inner tube of the coaxial GHE is assembled with HF of different width ratio (a), thickness ratio (b) and pitch ratio (S) are numerically studied in this paper. Water is chosen as the working medium, and the Reynolds number range is 10000–60000. HF have a significant impact on heat exchanger performance by changing the fluid flow structure and improving the efficacy of heat transfer between the fluid and the wall. Numerical results show that as the Reynolds number increases, the Nusselt number (Nu) of coaxial GHE with different a, b, and S increases, while the friction factor(f) and thermal enhancement factor (TEF) decreases. The Nu and f of the coaxial GHE with HF of different a, b, and S on the inner tube are higher than those of the coaxial GHE with smooth inner tube. The change in S of HF has a greater effect on Nu and f than the changes in a and b of HF have on Nu and f. To discover the enhanced heat transfer mechanism of the coaxial GHE with HF assembled on the inner tube, flow lines, velocity, turbulence, turbulence, and temperature distribution are provided. According to the analysis, the blocking of the HF causes the fluid to appear as a spiral rotating flow structure, which improves fluid mixing and heat exchange between the fluid and the wall. Increases in both a and b of HF can improve the heat transfer strength of the fluid to the wall, while decreases in S of HF can hasten fluid mixing. Finally, two correlations are established based on the numerical simulation data to predict Nu and f as functions of design parameters in turbulent flow states." @default.
• W4312053823 created "2023-01-04" @default.
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• W4312053823 date "2023-04-01" @default.
• W4312053823 modified "2023-09-27" @default.
• W4312053823 title "Numerical study on heat transfer and flow characteristics of coaxial geothermal heat exchangers with helical finned inner tubes" @default.
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• W4312053823 doi "https://doi.org/10.1016/j.jobe.2022.105752" @default.
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