Study on heat storage performance of novel bifurcated fins to strengthen shell-and-tube energy storage tanks

doi:10.19799/j.cnki.2095-4239.2022.0501

Abstract

Abstract:

The issue that the quality and maximum heat storage capacity of the phase-change material (PCM) are diminished as a result of the fins taking up some of the volume of the phase-change energy storage device is one that must be addressed by optimizing the fin structure. To improve the heat storage capacity of the shell-and-tube phase-change energy storage tank, a new type of fin was developed according to the bifurcated shape based on the conventional longitudinal fin, and a three-dimensional numerical simulation of the PCM melting process with natural convection in the device was carried out. The effects of the heat transfer fluid's inlet temperature, flow rate, and fin count on the melting of PCM have been examined in detail. The findings demonstrate that, in comparison with the longitudinal fin of the same volume and number, the new bifurcated fin greatly speeds up the heat storage process in the shell-and-tube phase-change energy storage tank. The new bifurcated fins increased average heat storage rate by 142.1% and 31.4%, respectively, while reducing PCM melting time by 59.9% and 23.4%, respectively, compared to longitudinal fins and no fins. Increasing the number of fins can decrease PCM's melting time and increase average heat storage rate without changing the volume of fins. However, there is no further gain in heat storage performance when the number of fins is greater than 6. Shortening the PCM melting time and increasing the total and the average heat storage rates can be accomplished by raising the heat transfer fluid's inlet temperature and flow rate. The results can offer a specific reference value for the structural optimization of the shell-and-tube energy storage device and the effective exploitation of solar energy.

Key words: fin, energy storage device, phase change material, heat storage performance

CLC Number:

TK 02

Qianjun MAO, Yuanyuan ZHU. Study on heat storage performance of novel bifurcated fins to strengthen shell-and-tube energy storage tanks[J]. Energy Storage Science and Technology, 2023, 12(1): 69-78.

Figures/Tables 10

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物理参数	石蜡	铜
密度ρ/(kg/m³)	885	8978
导热系数k/(W/m·K)	0.279	387.6
比热容c_p /(J/kg·K)	2000	381
相变潜热L/(J/kg)	172620	/
固相点T_s/K	321	/
液相点T_l/K	323	/
动力黏度μ/(Pa·s)	1.72e-05	/
热膨胀系数β/K^-1	0.0006	/

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