A numerical study on control mechanism of heat transfer in a double pipe PCM heat exchanger by changing eccentricity

Mase, Yamato; Sucipto, Zulfa Fajriani; Mobedi, Moghtada

doi:10.1016/j.energy.2024.130266

Cited by 7 publications

(1 citation statement)

References 37 publications

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“…The numerical analysis of this study is based on four assumptions: (1) the shell-side air is regarded as fully developed turbulence and is in a stable state; (2) the shell-side air is regarded as incompressible; (3) the heat dissipation of the surface of the heater shell is ignored; (4) the electric heating rod is regarded as a wall with a constant heat flux. 23 Because the flow pattern of heater shell-side air is spiral flow, the renormalization group (RNG) k − ε model is used in the simulation process. In addition, the options "enhanced wall treatment" and "thermal effects" are selected.…”

Section: Simulation Methodsmentioning

confidence: 99%

Investigations on the Performance of a Downhole Electric Heater with Different Parameters Used in Oil Shale In Situ Conversion

Ren,

Wang,

Yang

et al. 2024

ACS Omega

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In situ conversion is the most potential technology for efficient and clean development of oil shale, and a downhole electric heater is key equipment for clean, efficient, and low-carbon in situ conversion. Three electric heating rods with different diameters are used to explore their influence on heater performances. The simulation results indicate that increasing the diameter of the heating rod helps to increase the minimum and maximum velocity of shell-side air, and the maximum velocity of H110-24 is 16.34 m/s, which is 1.25 and 1.13 times those of H110-16 and H110-20, respectively. In addition, the location of the local high temperature zone coincides with the area with low air flow velocity, and increasing the diameter of the heating rod can effectively reduce the heating rod surface temperature during high-power heating. Moreover, at the same heat flux, the heat transfer coefficients of H110-24 and H110-20 are 44.82−48.49% and 87.52−95.48% higher than those of H110-16, respectively. With the same heating power, the heat transfer coefficients of heaters have the same trend, indicating that the heat transfer coefficient of the heating rod can be effectively improved by increasing the diameter of the heating rod. Finally, the newly defined comprehensive performance is used to evaluate the heaters with different heating parameters. Increasing the heating power can improve the comprehensive performance of the heater, but the most effective way is to increase the diameter of the heating rod. With the same heating power, the new comprehensive performance of H110-24 and H110-20 is 48.38− 52.34% and 87.29−95.19% higher than that of H110-16, respectively, and the electric heating rod with the diameter of 20 mm has the best performance.

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Section: Simulation Methodsmentioning

confidence: 99%